IteratorUtils.java
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org.apache.commons.collections |
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Commons Collections |
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| Metric | Description | |
|---|---|---|
| DOC_COMMENT | Number of javadoc comment lines |  |
| COMMENTS | Comment lines | |
| DECL_COMMENTS | Comments in declarations | |
| SIZE | Size of the file in bytes | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| PARAMS | Number of formal parameter declarations | |
| LINES | Number of lines in the source file | |
| RETURNS | Number of return points from functions | |
| FUNCTIONS | Number of function declarations | |
| LINE_COMMENT | Number of line comments | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| BLOCKS | Number of blocks | |
| CYCLOMATIC | Cyclomatic complexity | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| UNIQUE_OPERANDS | Number of unique operands | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0136 | JAVA0136 N methods defined in class (maximum: M) | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| EXEC_COMMENTS | Comments in executable code | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| OPERATORS | Number of operators | |
| PROGRAM_LENGTH | Halstead program length | |
| JAVA0287 | JAVA0287 Unnecessary null check | |
| OPERANDS | Number of operands | |
| LOOPS | Number of loops | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| NEST_DEPTH | Maximum nesting depth | |
| JAVA0145 | JAVA0145 Tab character used in source file | |
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.collections;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import org.apache.commons.collections.iterators.ArrayIterator;
import org.apache.commons.collections.iterators.ArrayListIterator;
import org.apache.commons.collections.iterators.CollatingIterator;
import org.apache.commons.collections.iterators.EmptyIterator;
import org.apache.commons.collections.iterators.EmptyListIterator;
import org.apache.commons.collections.iterators.EmptyMapIterator;
import org.apache.commons.collections.iterators.EmptyOrderedIterator;
import org.apache.commons.collections.iterators.EmptyOrderedMapIterator;
import org.apache.commons.collections.iterators.EnumerationIterator;
import org.apache.commons.collections.iterators.FilterIterator;
import org.apache.commons.collections.iterators.FilterListIterator;
import org.apache.commons.collections.iterators.IteratorChain;
import org.apache.commons.collections.iterators.IteratorEnumeration;
import org.apache.commons.collections.iterators.ListIteratorWrapper;
import org.apache.commons.collections.iterators.LoopingIterator;
import org.apache.commons.collections.iterators.LoopingListIterator;
import org.apache.commons.collections.iterators.ObjectArrayIterator;
import org.apache.commons.collections.iterators.ObjectArrayListIterator;
import org.apache.commons.collections.iterators.ObjectGraphIterator;
import org.apache.commons.collections.iterators.SingletonIterator;
import org.apache.commons.collections.iterators.SingletonListIterator;
import org.apache.commons.collections.iterators.TransformIterator;
import org.apache.commons.collections.iterators.UnmodifiableIterator;
import org.apache.commons.collections.iterators.UnmodifiableListIterator;
import org.apache.commons.collections.iterators.UnmodifiableMapIterator;
/**
* Provides static utility methods and decorators for {@link Iterator}
* instances. The implementations are provided in the iterators subpackage.
* <p>
* WARNING: Due to human error certain binary incompatabilities were introduced
* between Commons Collections 2.1 and 3.0. The class remained source and test
* compatible, so if you can recompile all your classes and dependencies
* everything is OK. Those methods which are binary incompatible are marked as
* such, together with alternate solutions that are binary compatible
* against versions 2.1.1 and 3.1.
*
* @since Commons Collections 2.1
* @version $Revision: 480452 $ $Date: 2006-11-29 02:45:14 -0500 (Wed, 29 Nov 2006) $
*
* @author Stephen Colebourne
* @author Phil Steitz
*/
public class IteratorUtils {
// validation is done in this class in certain cases because the
// public classes allow invalid states
/**
* An iterator over no elements.
* <p>
* WARNING: This constant is binary incompatible with Commons Collections 2.1 and 2.1.1.
* Use <code>EmptyIterator.INSTANCE</code> for compatability with Commons Collections 2.1.1.
*/
public static final ResettableIterator EMPTY_ITERATOR = EmptyIterator.RESETTABLE_INSTANCE;
/**
* A list iterator over no elements.
* <p>
* WARNING: This constant is binary incompatible with Commons Collections 2.1 and 2.1.1.
* Use <code>EmptyListIterator.INSTANCE</code> for compatability with Commons Collections 2.1.1.
*/
public static final ResettableListIterator EMPTY_LIST_ITERATOR = EmptyListIterator.RESETTABLE_INSTANCE;
/**
* An ordered iterator over no elements.
*/
public static final OrderedIterator EMPTY_ORDERED_ITERATOR = EmptyOrderedIterator.INSTANCE;
/**
* A map iterator over no elements.
*/
public static final MapIterator EMPTY_MAP_ITERATOR = EmptyMapIterator.INSTANCE;
/**
* An ordered map iterator over no elements.
*/
public static final OrderedMapIterator EMPTY_ORDERED_MAP_ITERATOR = EmptyOrderedMapIterator.INSTANCE;
/**
* IteratorUtils is not normally instantiated.
*/
public IteratorUtils() {
}
// Empty
//-----------------------------------------------------------------------
/**
* Gets an empty iterator.
* <p>
* This iterator is a valid iterator object that will iterate over
* nothing.
* <p>
* WARNING: This method is binary incompatible with Commons Collections 2.1 and 2.1.1.
* Use <code>EmptyIterator.INSTANCE</code> for compatability with Commons Collections 2.1.1.
*
* @return an iterator over nothing
*/
public static ResettableIterator emptyIterator() {
return EMPTY_ITERATOR;
}
/**
* Gets an empty list iterator.
* <p>
* This iterator is a valid list iterator object that will iterate
* over nothing.
* <p>
* WARNING: This method is binary incompatible with Commons Collections 2.1 and 2.1.1.
* Use <code>EmptyListIterator.INSTANCE</code> for compatability with Commons Collections 2.1.1.
*
* @return a list iterator over nothing
*/
public static ResettableListIterator emptyListIterator() {
return EMPTY_LIST_ITERATOR;
}
/**
* Gets an empty ordered iterator.
* <p>
* This iterator is a valid iterator object that will iterate
* over nothing.
*
* @return an ordered iterator over nothing
*/
public static OrderedIterator emptyOrderedIterator() {
return EMPTY_ORDERED_ITERATOR;
}
/**
* Gets an empty map iterator.
* <p>
* This iterator is a valid map iterator object that will iterate
* over nothing.
*
* @return a map iterator over nothing
*/
public static MapIterator emptyMapIterator() {
return EMPTY_MAP_ITERATOR;
}
/**
* Gets an empty ordered map iterator.
* <p>
* This iterator is a valid map iterator object that will iterate
* over nothing.
*
* @return a map iterator over nothing
*/
public static OrderedMapIterator emptyOrderedMapIterator() {
return EMPTY_ORDERED_MAP_ITERATOR;
}
// Singleton
//-----------------------------------------------------------------------
/**
* Gets a singleton iterator.
* <p>
* This iterator is a valid iterator object that will iterate over
* the specified object.
* <p>
* WARNING: This method is binary incompatible with Commons Collections 2.1 and 2.1.1.
* Use <code>new SingletonIterator(object)</code> for compatability.
*
* @param object the single object over which to iterate
* @return a singleton iterator over the object
*/
public static ResettableIterator singletonIterator(Object object) {
return new SingletonIterator(object);
}
/**
* Gets a singleton list iterator.
* <p>
* This iterator is a valid list iterator object that will iterate over
* the specified object.
*
* @param object the single object over which to iterate
* @return a singleton list iterator over the object
*/
public static ListIterator singletonListIterator(Object object) {
return new SingletonListIterator(object);
}
// Arrays
//-----------------------------------------------------------------------
/**
* Gets an iterator over an object array.
* <p>
* WARNING: This method is binary incompatible with Commons Collections 2.1 and 2.1.1.
* Use <code>new ArrayIterator(array)</code> for compatability.
*
* @param array the array over which to iterate
* @return an iterator over the array
* @throws NullPointerException if array is null
*/
public static ResettableIterator arrayIterator(Object[] array) {
return new ObjectArrayIterator(array);
}
/**
* Gets an iterator over an object or primitive array.
* <p>
* This method will handle primitive arrays as well as object arrays.
* The primitives will be wrapped in the appropriate wrapper class.
*
* @param array the array over which to iterate
* @return an iterator over the array
* @throws IllegalArgumentException if the array is not an array
* @throws NullPointerException if array is null
*/
public static ResettableIterator arrayIterator(Object array) {
return new ArrayIterator(array);
}
/**
* Gets an iterator over the end part of an object array.
* <p>
* WARNING: This method is binary incompatible with Commons Collections 2.1 and 2.1.1.
* Use <code>new ArrayIterator(array,start)</code> for compatability.
*
* @param array the array over which to iterate
* @param start the index to start iterating at
* @return an iterator over part of the array
* @throws IndexOutOfBoundsException if start is less than zero or greater
* than the length of the array
* @throws NullPointerException if array is null
*/
public static ResettableIterator arrayIterator(Object[] array, int start) {
return new ObjectArrayIterator(array, start);
}
/**
* Gets an iterator over the end part of an object or primitive array.
* <p>
* This method will handle primitive arrays as well as object arrays.
* The primitives will be wrapped in the appropriate wrapper class.
*
* @param array the array over which to iterate
* @param start the index to start iterating at
* @return an iterator over part of the array
* @throws IllegalArgumentException if the array is not an array
* @throws IndexOutOfBoundsException if start is less than zero or greater
* than the length of the array
* @throws NullPointerException if array is null
*/
public static ResettableIterator arrayIterator(Object array, int start) {
return new ArrayIterator(array, start);
}
/**
* Gets an iterator over part of an object array.
* <p>
* WARNING: This method is binary incompatible with Commons Collections 2.1 and 2.1.1.
* Use <code>new ArrayIterator(array,start,end)</code> for compatability.
*
* @param array the array over which to iterate
* @param start the index to start iterating at
* @param end the index to finish iterating at
* @return an iterator over part of the array
* @throws IndexOutOfBoundsException if array bounds are invalid
* @throws IllegalArgumentException if end is before start
* @throws NullPointerException if array is null
*/
public static ResettableIterator arrayIterator(Object[] array, int start, int end) {
return new ObjectArrayIterator(array, start, end);
}
/**
* Gets an iterator over part of an object or primitive array.
* <p>
* This method will handle primitive arrays as well as object arrays.
* The primitives will be wrapped in the appropriate wrapper class.
*
* @param array the array over which to iterate
* @param start the index to start iterating at
* @param end the index to finish iterating at
* @return an iterator over part of the array
* @throws IllegalArgumentException if the array is not an array
* @throws IndexOutOfBoundsException if array bounds are invalid
* @throws IllegalArgumentException if end is before start
* @throws NullPointerException if array is null
*/
public static ResettableIterator arrayIterator(Object array, int start, int end) {
return new ArrayIterator(array, start, end);
}
//-----------------------------------------------------------------------
/**
* Gets a list iterator over an object array.
*
* @param array the array over which to iterate
* @return a list iterator over the array
* @throws NullPointerException if array is null
*/
public static ResettableListIterator arrayListIterator(Object[] array) {
return new ObjectArrayListIterator(array);
}
/**
* Gets a list iterator over an object or primitive array.
* <p>
* This method will handle primitive arrays as well as object arrays.
* The primitives will be wrapped in the appropriate wrapper class.
*
* @param array the array over which to iterate
* @return a list iterator over the array
* @throws IllegalArgumentException if the array is not an array
* @throws NullPointerException if array is null
*/
public static ResettableListIterator arrayListIterator(Object array) {
return new ArrayListIterator(array);
}
/**
* Gets a list iterator over the end part of an object array.
*
* @param array the array over which to iterate
* @param start the index to start iterating at
* @return a list iterator over part of the array
* @throws IndexOutOfBoundsException if start is less than zero
* @throws NullPointerException if array is null
*/
public static ResettableListIterator arrayListIterator(Object[] array, int start) {
return new ObjectArrayListIterator(array, start);
}
/**
* Gets a list iterator over the end part of an object or primitive array.
* <p>
* This method will handle primitive arrays as well as object arrays.
* The primitives will be wrapped in the appropriate wrapper class.
*
* @param array the array over which to iterate
* @param start the index to start iterating at
* @return a list iterator over part of the array
* @throws IllegalArgumentException if the array is not an array
* @throws IndexOutOfBoundsException if start is less than zero
* @throws NullPointerException if array is null
*/
public static ResettableListIterator arrayListIterator(Object array, int start) {
return new ArrayListIterator(array, start);
}
/**
* Gets a list iterator over part of an object array.
*
* @param array the array over which to iterate
* @param start the index to start iterating at
* @param end the index to finish iterating at
* @return a list iterator over part of the array
* @throws IndexOutOfBoundsException if array bounds are invalid
* @throws IllegalArgumentException if end is before start
* @throws NullPointerException if array is null
*/
public static ResettableListIterator arrayListIterator(Object[] array, int start, int end) {
return new ObjectArrayListIterator(array, start, end);
}
/**
* Gets a list iterator over part of an object or primitive array.
* <p>
* This method will handle primitive arrays as well as object arrays.
* The primitives will be wrapped in the appropriate wrapper class.
*
* @param array the array over which to iterate
* @param start the index to start iterating at
* @param end the index to finish iterating at
* @return a list iterator over part of the array
* @throws IllegalArgumentException if the array is not an array
* @throws IndexOutOfBoundsException if array bounds are invalid
* @throws IllegalArgumentException if end is before start
* @throws NullPointerException if array is null
*/
public static ResettableListIterator arrayListIterator(Object array, int start, int end) {
return new ArrayListIterator(array, start, end);
}
// Unmodifiable
//-----------------------------------------------------------------------
/**
* Gets an immutable version of an {@link Iterator}. The returned object
* will always throw an {@link UnsupportedOperationException} for
* the {@link Iterator#remove} method.
*
* @param iterator the iterator to make immutable
* @return an immutable version of the iterator
*/
public static Iterator unmodifiableIterator(Iterator iterator) {
return UnmodifiableIterator.decorate(iterator);
}
/**
* Gets an immutable version of a {@link ListIterator}. The returned object
* will always throw an {@link UnsupportedOperationException} for
* the {@link Iterator#remove}, {@link ListIterator#add} and
* {@link ListIterator#set} methods.
*
* @param listIterator the iterator to make immutable
* @return an immutable version of the iterator
*/
public static ListIterator unmodifiableListIterator(ListIterator listIterator) {
return UnmodifiableListIterator.decorate(listIterator);
}
/**
* Gets an immutable version of a {@link MapIterator}. The returned object
* will always throw an {@link UnsupportedOperationException} for
* the {@link Iterator#remove}, {@link MapIterator#setValue(Object)} methods.
*
* @param mapIterator the iterator to make immutable
* @return an immutable version of the iterator
*/
public static MapIterator unmodifiableMapIterator(MapIterator mapIterator) {
return UnmodifiableMapIterator.decorate(mapIterator);
}
// Chained
//-----------------------------------------------------------------------
/**
* Gets an iterator that iterates through two {@link Iterator}s
* one after another.
*
* @param iterator1 the first iterators to use, not null
* @param iterator2 the first iterators to use, not null
* @return a combination iterator over the iterators
* @throws NullPointerException if either iterator is null
*/
public static Iterator chainedIterator(Iterator iterator1, Iterator iterator2) {
return new IteratorChain(iterator1, iterator2);
}
/**
* Gets an iterator that iterates through an array of {@link Iterator}s
* one after another.
*
* @param iterators the iterators to use, not null or empty or contain nulls
* @return a combination iterator over the iterators
* @throws NullPointerException if iterators array is null or contains a null
*/
public static Iterator chainedIterator(Iterator[] iterators) {
return new IteratorChain(iterators);
}
/**
* Gets an iterator that iterates through a collections of {@link Iterator}s
* one after another.
*
* @param iterators the iterators to use, not null or empty or contain nulls
* @return a combination iterator over the iterators
* @throws NullPointerException if iterators collection is null or contains a null
* @throws ClassCastException if the iterators collection contains the wrong object type
*/
public static Iterator chainedIterator(Collection iterators) {
return new IteratorChain(iterators);
}
// Collated
//-----------------------------------------------------------------------
/**
* Gets an iterator that provides an ordered iteration over the elements
* contained in a collection of ordered {@link Iterator}s.
* <p>
* Given two ordered {@link Iterator}s <code>A</code> and <code>B</code>,
* the {@link Iterator#next()} method will return the lesser of
* <code>A.next()</code> and <code>B.next()</code>.
* <p>
* The comparator is optional. If null is specified then natural order is used.
*
* @param comparator the comparator to use, may be null for natural order
* @param iterator1 the first iterators to use, not null
* @param iterator2 the first iterators to use, not null
* @return a combination iterator over the iterators
* @throws NullPointerException if either iterator is null
*/
public static Iterator collatedIterator(Comparator comparator, Iterator iterator1, Iterator iterator2) {
return new CollatingIterator(comparator, iterator1, iterator2);
}
/**
* Gets an iterator that provides an ordered iteration over the elements
* contained in an array of {@link Iterator}s.
* <p>
* Given two ordered {@link Iterator}s <code>A</code> and <code>B</code>,
* the {@link Iterator#next()} method will return the lesser of
* <code>A.next()</code> and <code>B.next()</code> and so on.
* <p>
* The comparator is optional. If null is specified then natural order is used.
*
* @param comparator the comparator to use, may be null for natural order
* @param iterators the iterators to use, not null or empty or contain nulls
* @return a combination iterator over the iterators
* @throws NullPointerException if iterators array is null or contains a null
*/
public static Iterator collatedIterator(Comparator comparator, Iterator[] iterators) {
return new CollatingIterator(comparator, iterators);
}
/**
* Gets an iterator that provides an ordered iteration over the elements
* contained in a collection of {@link Iterator}s.
* <p>
* Given two ordered {@link Iterator}s <code>A</code> and <code>B</code>,
* the {@link Iterator#next()} method will return the lesser of
* <code>A.next()</code> and <code>B.next()</code> and so on.
* <p>
* The comparator is optional. If null is specified then natural order is used.
*
* @param comparator the comparator to use, may be null for natural order
* @param iterators the iterators to use, not null or empty or contain nulls
* @return a combination iterator over the iterators
* @throws NullPointerException if iterators collection is null or contains a null
* @throws ClassCastException if the iterators collection contains the wrong object type
*/
public static Iterator collatedIterator(Comparator comparator, Collection iterators) {
return new CollatingIterator(comparator, iterators);
}
// Object Graph
//-----------------------------------------------------------------------
/**
* Gets an iterator that operates over an object graph.
* <p>
* This iterator can extract multiple objects from a complex tree-like object graph.
* The iteration starts from a single root object.
* It uses a <code>Transformer</code> to extract the iterators and elements.
* Its main benefit is that no intermediate <code>List</code> is created.
* <p>
* For example, consider an object graph:
* <pre>
* |- Branch -- Leaf
* | \- Leaf
* |- Tree | /- Leaf
* | |- Branch -- Leaf
* Forest | \- Leaf
* | |- Branch -- Leaf
* | | \- Leaf
* |- Tree | /- Leaf
* |- Branch -- Leaf
* |- Branch -- Leaf</pre>
* The following <code>Transformer</code>, used in this class, will extract all
* the Leaf objects without creating a combined intermediate list:
* <pre>
* public Object transform(Object input) {
* if (input instanceof Forest) {
* return ((Forest) input).treeIterator();
* }
* if (input instanceof Tree) {
* return ((Tree) input).branchIterator();
* }
* if (input instanceof Branch) {
* return ((Branch) input).leafIterator();
* }
* if (input instanceof Leaf) {
* return input;
* }
* throw new ClassCastException();
* }</pre>
* <p>
* Internally, iteration starts from the root object. When next is called,
* the transformer is called to examine the object. The transformer will return
* either an iterator or an object. If the object is an Iterator, the next element
* from that iterator is obtained and the process repeats. If the element is an object
* it is returned.
* <p>
* Under many circumstances, linking Iterators together in this manner is
* more efficient (and convenient) than using nested for loops to extract a list.
*
* @param root the root object to start iterating from, null results in an empty iterator
* @param transformer the transformer to use, see above, null uses no effect transformer
* @return a new object graph iterator
* @since Commons Collections 3.1
*/
public static Iterator objectGraphIterator(Object root, Transformer transformer) {
return new ObjectGraphIterator(root, transformer);
}
// Transformed
//-----------------------------------------------------------------------
/**
* Gets an iterator that transforms the elements of another iterator.
* <p>
* The transformation occurs during the next() method and the underlying
* iterator is unaffected by the transformation.
*
* @param iterator the iterator to use, not null
* @param transform the transform to use, not null
* @return a new transforming iterator
* @throws NullPointerException if either parameter is null
*/
public static Iterator transformedIterator(Iterator iterator, Transformer transform) {
if (iterator == null) {
throw new NullPointerException("Iterator must not be null");
}
if (transform == null) {
throw new NullPointerException("Transformer must not be null");
}
return new TransformIterator(iterator, transform);
}
// Filtered
//-----------------------------------------------------------------------
/**
* Gets an iterator that filters another iterator.
* <p>
* The returned iterator will only return objects that match the specified
* filtering predicate.
*
* @param iterator the iterator to use, not null
* @param predicate the predicate to use as a filter, not null
* @return a new filtered iterator
* @throws NullPointerException if either parameter is null
*/
public static Iterator filteredIterator(Iterator iterator, Predicate predicate) {
if (iterator == null) {
throw new NullPointerException("Iterator must not be null");
}
if (predicate == null) {
throw new NullPointerException("Predicate must not be null");
}
return new FilterIterator(iterator, predicate);
}
/**
* Gets a list iterator that filters another list iterator.
* <p>
* The returned iterator will only return objects that match the specified
* filtering predicate.
*
* @param listIterator the list iterator to use, not null
* @param predicate the predicate to use as a filter, not null
* @return a new filtered iterator
* @throws NullPointerException if either parameter is null
*/
public static ListIterator filteredListIterator(ListIterator listIterator, Predicate predicate) {
if (listIterator == null) {
throw new NullPointerException("ListIterator must not be null");
}
if (predicate == null) {
throw new NullPointerException("Predicate must not be null");
}
return new FilterListIterator(listIterator, predicate);
}
// Looping
//-----------------------------------------------------------------------
/**
* Gets an iterator that loops continuously over the supplied collection.
* <p>
* The iterator will only stop looping if the remove method is called
* enough times to empty the collection, or if the collection is empty
* to start with.
*
* @param coll the collection to iterate over, not null
* @return a new looping iterator
* @throws NullPointerException if the collection is null
*/
public static ResettableIterator loopingIterator(Collection coll) {
if (coll == null) {
throw new NullPointerException("Collection must not be null");
}
return new LoopingIterator(coll);
}
/**
* Gets an iterator that loops continuously over the supplied list.
* <p>
* The iterator will only stop looping if the remove method is called
* enough times to empty the list, or if the list is empty to start with.
*
* @param list the list to iterate over, not null
* @return a new looping iterator
* @throws NullPointerException if the list is null
* @since Commons Collections 3.2
*/
public static ResettableListIterator loopingListIterator(List list) {
if (list == null) {
throw new NullPointerException("List must not be null");
}
return new LoopingListIterator(list);
}
// Views
//-----------------------------------------------------------------------
/**
* Gets an iterator that provides an iterator view of the given enumeration.
*
* @param enumeration the enumeration to use
* @return a new iterator
*/
public static Iterator asIterator(Enumeration enumeration) {
if (enumeration == null) {
throw new NullPointerException("Enumeration must not be null");
}
return new EnumerationIterator(enumeration);
}
/**
* Gets an iterator that provides an iterator view of the given enumeration
* that will remove elements from the specified collection.
*
* @param enumeration the enumeration to use
* @param removeCollection the collection to remove elements from
* @return a new iterator
*/
public static Iterator asIterator(Enumeration enumeration, Collection removeCollection) {
if (enumeration == null) {
throw new NullPointerException("Enumeration must not be null");
}
if (removeCollection == null) {
throw new NullPointerException("Collection must not be null");
}
return new EnumerationIterator(enumeration, removeCollection);
}
/**
* Gets an enumeration that wraps an iterator.
*
* @param iterator the iterator to use, not null
* @return a new enumeration
* @throws NullPointerException if iterator is null
*/
public static Enumeration asEnumeration(Iterator iterator) {
if (iterator == null) {
throw new NullPointerException("Iterator must not be null");
}
return new IteratorEnumeration(iterator);
}
/**
* Gets a list iterator based on a simple iterator.
* <p>
* As the wrapped Iterator is traversed, a LinkedList of its values is
* cached, permitting all required operations of ListIterator.
*
* @param iterator the iterator to use, not null
* @return a new iterator
* @throws NullPointerException if iterator parameter is null
*/
public static ListIterator toListIterator(Iterator iterator) {
if (iterator == null) {
throw new NullPointerException("Iterator must not be null");
}
return new ListIteratorWrapper(iterator);
}
/**
* Gets an array based on an iterator.
* <p>
* As the wrapped Iterator is traversed, an ArrayList of its values is
* created. At the end, this is converted to an array.
*
* @param iterator the iterator to use, not null
* @return an array of the iterator contents
* @throws NullPointerException if iterator parameter is null
*/
public static Object[] toArray(Iterator iterator) {
if (iterator == null) {
throw new NullPointerException("Iterator must not be null");
}
List list = toList(iterator, 100);
return list.toArray();
}
/**
* Gets an array based on an iterator.
* <p>
* As the wrapped Iterator is traversed, an ArrayList of its values is
* created. At the end, this is converted to an array.
*
* @param iterator the iterator to use, not null
* @param arrayClass the class of array to create
* @return an array of the iterator contents
* @throws NullPointerException if iterator parameter is null
* @throws NullPointerException if arrayClass is null
* @throws ClassCastException if the arrayClass is invalid
*/
public static Object[] toArray(Iterator iterator, Class arrayClass) {
if (iterator == null) {
throw new NullPointerException("Iterator must not be null");
}
if (arrayClass == null) {
throw new NullPointerException("Array class must not be null");
}
List list = toList(iterator, 100);
return list.toArray((Object[]) Array.newInstance(arrayClass, list.size()));
}
/**
* Gets a list based on an iterator.
* <p>
* As the wrapped Iterator is traversed, an ArrayList of its values is
* created. At the end, the list is returned.
*
* @param iterator the iterator to use, not null
* @return a list of the iterator contents
* @throws NullPointerException if iterator parameter is null
*/
public static List toList(Iterator iterator) {
return toList(iterator, 10);
}
/**
* Gets a list based on an iterator.
* <p>
* As the wrapped Iterator is traversed, an ArrayList of its values is
* created. At the end, the list is returned.
*
* @param iterator the iterator to use, not null
* @param estimatedSize the initial size of the ArrayList
* @return a list of the iterator contents
* @throws NullPointerException if iterator parameter is null
* @throws IllegalArgumentException if the size is less than 1
*/
public static List toList(Iterator iterator, int estimatedSize) {
if (iterator == null) {
throw new NullPointerException("Iterator must not be null");
}
if (estimatedSize < 1) {
throw new IllegalArgumentException("Estimated size must be greater than 0");
}
List list = new ArrayList(estimatedSize);
while (iterator.hasNext()) {
list.add(iterator.next());
}
return list;
}
/**
* Gets a suitable Iterator for the given object.
* <p>
* This method can handles objects as follows
* <ul>
* <li>null - empty iterator
* <li>Iterator - returned directly
* <li>Enumeration - wrapped
* <li>Collection - iterator from collection returned
* <li>Map - values iterator returned
* <li>Dictionary - values (elements) enumeration returned as iterator
* <li>array - iterator over array returned
* <li>object with iterator() public method accessed by reflection
* <li>object - singleton iterator
* </ul>
*
* @param obj the object to convert to an iterator
* @return a suitable iterator, never null
*/
public static Iterator getIterator(Object obj) {
if (obj == null) {
return emptyIterator();
} else if (obj instanceof Iterator) {
return (Iterator) obj;
} else if (obj instanceof Collection) {
return ((Collection) obj).iterator();
} else if (obj instanceof Object[]) {
return new ObjectArrayIterator((Object[]) obj);
} else if (obj instanceof Enumeration) {
return new EnumerationIterator((Enumeration) obj);
} else if (obj instanceof Map) {
return ((Map) obj).values().iterator();
} else if (obj instanceof Dictionary) {
return new EnumerationIterator(((Dictionary) obj).elements());
} else if (obj != null && obj.getClass().isArray()) {
return new ArrayIterator(obj);
} else {
try {
Method method = obj.getClass().getMethod("iterator", (Class[]) null);
if (Iterator.class.isAssignableFrom(method.getReturnType())) {
Iterator it = (Iterator) method.invoke(obj, (Object[]) null);
if (it != null) {
return it;
}
}
} catch (Exception ex) {
// ignore
}
return singletonIterator(obj);
}
}
}
The table below shows all metrics for IteratorUtils.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 76.00 | Number of blocks | |
| BLOCK_COMMENT | 16.00 | Number of block comment lines | |
| COMMENTS | 594.00 | Comment lines | |
| COMMENT_DENSITY | 3.05 | Comment density | |
| COMPARISONS | 24.00 | Number of comparison operators | |
| CYCLOMATIC | 75.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 64.00 | Comments in declarations | |
| DOC_COMMENT | 552.00 | Number of javadoc comment lines | |
| ELOC | 195.00 | Effective lines of code | |
| EXEC_COMMENTS | 1.00 | Comments in executable code | |
| EXITS | 22.00 | Procedure exits | |
| FUNCTIONS | 44.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 46.01 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 134.00 | Interface complexity | |
| JAVA0001 | 0.00 | JAVA0001 Package name does not contain only lower case letters | |
| JAVA0002 | 0.00 | JAVA0002 Package name does not begin with a top level domain name or country code | |
| JAVA0003 | 0.00 | JAVA0003 Minimize use of on-demand (.*) imports | |
| JAVA0004 | 0.00 | JAVA0004 Unnecessary import from java.lang | |
| JAVA0005 | 0.00 | JAVA0005 Imports not in specified order | |
| JAVA0006 | 0.00 | JAVA0006 Empty finally block | |
| JAVA0007 | 0.00 | JAVA0007 Should not declare public field | |
| JAVA0008 | 0.00 | JAVA0008 Empty catch block | |
| JAVA0009 | 0.00 | JAVA0009 Protected member in final class | |
| JAVA0010 | 0.00 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0011 | 0.00 | JAVA0011 Abstract class does not contain an abstract method | |
| JAVA0012 | 0.00 | JAVA0012 Non-constructor method with same name as declaring class | |
| JAVA0013 | 0.00 | JAVA0013 Non-blank final field is not static | |
| JAVA0014 | 1.00 | JAVA0014 Class with only static members has non-private constructor | |
| JAVA0015 | 0.00 | JAVA0015 Package class contains public nested type | |
| JAVA0016 | 0.00 | JAVA0016 Abstract class contains public constructor | |
| JAVA0017 | 0.00 | JAVA0017 Class name does not have required form | |
| JAVA0018 | 0.00 | JAVA0018 Method name does not have required form | |
| JAVA0019 | 0.00 | JAVA0019 Interface name does not have required form | |
| JAVA0020 | 0.00 | JAVA0020 Field name does not have required form | |
| JAVA0021 | 0.00 | JAVA0021 Interface method name does not have required form | |
| JAVA0022 | 0.00 | JAVA0022 Static final field name does not have required form | |
| JAVA0023 | 0.00 | JAVA0023 Empty finalize method | |
| JAVA0024 | 0.00 | JAVA0024 Empty class | |
| JAVA0025 | 0.00 | JAVA0025 Method override is empty | |
| JAVA0026 | 0.00 | JAVA0026 Finalize method with parameters | |
| JAVA0029 | 0.00 | JAVA0029 Private method not used | |
| JAVA0030 | 0.00 | JAVA0030 Private field not used | |
| JAVA0031 | 0.00 | JAVA0031 Case statement not properly closed | |
| JAVA0032 | 0.00 | JAVA0032 Switch statement missing default | |
| JAVA0033 | 0.00 | JAVA0033 default: not last case in switch statement | |
| JAVA0034 | 0.00 | JAVA0034 Missing braces in if statement | |
| JAVA0035 | 0.00 | JAVA0035 Missing braces in for statement | |
| JAVA0036 | 0.00 | JAVA0036 Missing braces in while statement | |
| JAVA0038 | 0.00 | JAVA0038 Non-case label in switch statement | |
| JAVA0039 | 0.00 | JAVA0039 Break statement with label | |
| JAVA0040 | 0.00 | JAVA0040 Switch statement contains N cases (maximum: M) | |
| JAVA0041 | 0.00 | JAVA0041 Nested synchronized block | |
| JAVA0042 | 0.00 | JAVA0042 Empty synchronized statement | |
| JAVA0043 | 0.00 | JAVA0043 Inner class does not use outer class | |
| JAVA0044 | 0.00 | JAVA0044 Serializable class with no instance variables | |
| JAVA0045 | 0.00 | JAVA0045 Serializable class with only transient fields | |
| JAVA0046 | 0.00 | JAVA0046 Name of class not derived from Exception ends with 'Exception' | |
| JAVA0047 | 0.00 | JAVA0047 Serializable class derives from invalid base class | |
| JAVA0048 | 0.00 | JAVA0048 Name of class derived from Exception does not end with 'Exception' | |
| JAVA0049 | 0.00 | JAVA0049 Nested block at depth N (maximum: M) | |
| JAVA0050 | 0.00 | JAVA0050 Class derives from java.lang.Error | |
| JAVA0051 | 0.00 | JAVA0051 Class derives from java.lang.RuntimeException | |
| JAVA0052 | 0.00 | JAVA0052 Class derives from java.lang.Throwable | |
| JAVA0053 | 0.00 | JAVA0053 Unused label | |
| JAVA0054 | 0.00 | JAVA0054 Inheritance depth N exceeds maximum M | |
| JAVA0055 | 0.00 | JAVA0055 Class should be interface | |
| JAVA0056 | 0.00 | JAVA0056 Unnecessary abstract modifier for interface or annotation | |
| JAVA0057 | 1.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 0.00 | JAVA0058 Constructor calls super() | |
| JAVA0059 | 0.00 | JAVA0059 Method override only calls super() | |
| JAVA0061 | 0.00 | JAVA0061 Inaccessible member in anonymous class | |
| JAVA0062 | 0.00 | JAVA0062 Public class missing public member or protected constructor | |
| JAVA0063 | 0.00 | JAVA0063 Identifier name should not contain '$' | |
| JAVA0064 | 0.00 | JAVA0064 N variations of identifier name (maximum: M) | |
| JAVA0065 | 0.00 | JAVA0065 Unnecessary final modifier for method in final class | |
| JAVA0066 | 0.00 | JAVA0066 Unnecessary modifier for interface nested type | |
| JAVA0067 | 0.00 | JAVA0067 Array descriptor on identifier name | |
| JAVA0068 | 0.00 | JAVA0068 Modifiers not declared in recommended order | |
| JAVA0071 | 0.00 | JAVA0071 Strings compared with == | |
| JAVA0073 | 0.00 | JAVA0073 Integer division in floating-point context | |
| JAVA0074 | 0.00 | JAVA0074 Use of Object.notify() | |
| JAVA0075 | 0.00 | JAVA0075 Method parameter hides field | |
| JAVA0076 | 2.00 | JAVA0076 Use of magic number | |
| JAVA0077 | 0.00 | JAVA0077 Private field not used in declaring class | |
| JAVA0078 | 0.00 | JAVA0078 Floating point values compared with == | |
| JAVA0079 | 0.00 | JAVA0079 Use of instance to reference static member | |
| JAVA0080 | 0.00 | JAVA0080 Import declaration not used | |
| JAVA0081 | 0.00 | JAVA0081 Boolean literal in comparison | |
| JAVA0082 | 0.00 | JAVA0082 Unnecessary widening cast | |
| JAVA0083 | 0.00 | JAVA0083 Unnecessary instanceof test | |
| JAVA0084 | 0.00 | JAVA0084 Should use compound assignment operator | |
| JAVA0085 | 0.00 | JAVA0085 Use of sun.* class | |
| JAVA0087 | 0.00 | JAVA0087 Use of Thread.sleep() | |
| JAVA0089 | 0.00 | JAVA0089 Use of restricted package | |
| JAVA0092 | 0.00 | JAVA0092 Use of restricted type | |
| JAVA0093 | 0.00 | JAVA0093 Redundant assignment | |
| JAVA0094 | 0.00 | JAVA0094 Field hides a superclass field | |
| JAVA0095 | 0.00 | JAVA0095 Uninitialized private field | |
| JAVA0096 | 0.00 | JAVA0096 Field in nested class hides outer field | |
| JAVA0098 | 0.00 | JAVA0098 Minimize use of implicit field initializers | |
| JAVA0100 | 0.00 | JAVA0100 Class contains N non-final fields (maximum: M) | |
| JAVA0101 | 0.00 | JAVA0101 Unnecessary modifier for field in interface | |
| JAVA0102 | 0.00 | JAVA0102 Last statement in finalize() not super.finalize() | |
| JAVA0103 | 0.00 | JAVA0103 Explicit call to finalize() | |
| JAVA0104 | 0.00 | JAVA0104 finalize() only calls super.finalize() | |
| JAVA0105 | 0.00 | JAVA0105 Duplicate import declaration | |
| JAVA0106 | 0.00 | JAVA0106 Unnecessary import from current package | |
| JAVA0108 | 0.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 0.00 | JAVA0110 Incorrect javadoc: no @return tag | |
| JAVA0111 | 0.00 | JAVA0111 Incorrect javadoc: @return tag for void method | |
| JAVA0112 | 0.00 | JAVA0112 Incorrect javadoc: no exception 'exception' in throws | |
| JAVA0113 | 0.00 | JAVA0113 Incorrect javadoc: no @author tag | |
| JAVA0114 | 0.00 | JAVA0114 Incorrect javadoc: no @version tag | |
| JAVA0115 | 0.00 | JAVA0115 Incorrect javadoc: no @throws or @exception tag for 'exception' | |
| JAVA0116 | 0.00 | JAVA0116 Missing javadoc: field 'field' | |
| JAVA0117 | 0.00 | JAVA0117 Missing javadoc: method 'method' | |
| JAVA0118 | 0.00 | JAVA0118 Missing javadoc: type 'type' | |
| JAVA0119 | 0.00 | JAVA0119 Control variable changed within body of for loop | |
| JAVA0123 | 0.00 | JAVA0123 Use all three components of for loop | |
| JAVA0125 | 0.00 | JAVA0125 Continue statement with label | |
| JAVA0126 | 0.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 0.00 | JAVA0130 Non-static method does not use instance fields | |
| JAVA0131 | 0.00 | JAVA0131 Compatible method does not override base | |
| JAVA0132 | 0.00 | JAVA0132 Method overload with compatible signature | |
| JAVA0133 | 0.00 | JAVA0133 Non-synchronized method overrides synchronized method | |
| JAVA0135 | 0.00 | JAVA0135 Only one of Object.equals and Object.hashCode defined: missing 'method' | |
| JAVA0136 | 1.00 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0137 | 0.00 | JAVA0137 Non-abstract class missing constructor | |
| JAVA0138 | 0.00 | JAVA0138 N parameters defined for method (maximum: M) | |
| JAVA0139 | 0.00 | JAVA0139 Definition of main other than public static void main(java.lang.String[]) | |
| JAVA0141 | 0.00 | JAVA0141 Unnecessary modifier for method in interface | |
| JAVA0143 | 0.00 | JAVA0143 Synchronized method | |
| JAVA0144 | 0.00 | JAVA0144 Line exceeds maximum M characters | |
| JAVA0145 | 0.00 | JAVA0145 Tab character used in source file | |
| JAVA0150 | 0.00 | JAVA0150 java.lang.Error (or subclass) thrown | |
| JAVA0153 | 0.00 | JAVA0153 Inefficient conversion of integer to string | |
| JAVA0159 | 0.00 | JAVA0159 Inefficient conversion of string to integer | |
| JAVA0160 | 0.00 | JAVA0160 Method does not throw specified exception | |
| JAVA0161 | 0.00 | JAVA0161 Conditional wait() not in loop | |
| JAVA0163 | 0.00 | JAVA0163 Empty statement | |
| JAVA0165 | 0.00 | JAVA0165 Conflicting return statement in finally block | |
| JAVA0166 | 1.00 | JAVA0166 Generic exception caught | |
| JAVA0167 | 0.00 | JAVA0167 ThreadDeath not rethrown | |
| JAVA0169 | 0.00 | JAVA0169 Unnecessary catch block: exception 'exception' | |
| JAVA0170 | 0.00 | JAVA0170 Caught exception not derived from java.lang.Exception | |
| JAVA0171 | 0.00 | JAVA0171 Unused local variable | |
| JAVA0173 | 0.00 | JAVA0173 Unused method parameter | |
| JAVA0174 | 0.00 | JAVA0174 Assigned local variable never used | |
| JAVA0175 | 0.00 | JAVA0175 Successive assignment to variable | |
| JAVA0176 | 0.00 | JAVA0176 Local variable name does not have required form | |
| JAVA0177 | 0.00 | JAVA0177 Variable declaration missing initializer | |
| JAVA0179 | 0.00 | JAVA0179 Local variable hides visible field | |
| JAVA0233 | 0.00 | JAVA0233 Definition of serialVersionUID other than 'private static final long serialVersionUID' | |
| JAVA0234 | 0.00 | JAVA0234 Class is Serializable but does not define serialVersionUID | |
| JAVA0235 | 0.00 | JAVA0235 Class defines serialVersionUID but does not implement Serializable | |
| JAVA0236 | 0.00 | JAVA0236 Attempt to clone an object which does not implement Cloneable | |
| JAVA0237 | 0.00 | JAVA0237 Class implements Cloneable but does not have public clone method | |
| JAVA0238 | 0.00 | JAVA0238 Clone method does not call super.clone() | |
| JAVA0239 | 0.00 | JAVA0239 Class declares 'readObject' or 'writeObject' but does not implement Serializable | |
| JAVA0240 | 0.00 | JAVA0240 Serializable class which declares readObject or writeObject but not both | |
| JAVA0241 | 0.00 | JAVA0241 'readObject' or 'writeObject' should be declared private in Serializable class | |
| JAVA0242 | 0.00 | JAVA0242 Transient field in non-Serializable class | |
| JAVA0243 | 0.00 | JAVA0243 'readResolve' or 'writeReplace' should be declared private or protected | |
| JAVA0244 | 0.00 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| JAVA0245 | 0.00 | JAVA0245 JUnit TestCase with non-trivial constructor | |
| JAVA0246 | 0.00 | JAVA0246 JUnit assertXXX statement missing message parameter | |
| JAVA0247 | 0.00 | JAVA0247 JUnit 'setUp()' and 'tearDown()' should call super method | |
| JAVA0248 | 0.00 | JAVA0248 JUnit method 'setUp' or 'tearDown' with incorrect signature | |
| JAVA0249 | 0.00 | JAVA0249 JUnit TestCase 'suite()' should be declared static | |
| JAVA0250 | 0.00 | JAVA0250 JUnit TestCase declares testXXX method with incorrect signature | |
| JAVA0251 | 0.00 | JAVA0251 Use '%n' for line breaks in printf/format for platform independence | |
| JAVA0252 | 0.00 | JAVA0252 'enum' is a Java 1.5 reserved word | |
| JAVA0253 | 0.00 | JAVA0253 Not all enum constants consumed in switch statement | |
| JAVA0254 | 0.00 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0255 | 0.00 | JAVA0255 Result of method invocation not used | |
| JAVA0256 | 0.00 | JAVA0256 Assignment of external collection/array to field | |
| JAVA0257 | 0.00 | JAVA0257 Use of 'Constant Interface' anti-pattern | |
| JAVA0258 | 1.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 0.00 | JAVA0259 Return of collection/array field | |
| JAVA0260 | 0.00 | JAVA0260 Use 'enum' instead of Enumerated Type pattern | |
| JAVA0261 | 0.00 | JAVA0261 Use specialized Enum collection types | |
| JAVA0262 | 0.00 | JAVA0262 Use of char in integer context | |
| JAVA0263 | 0.00 | JAVA0263 Long literal ends with 'l' instead of 'L' | |
| JAVA0264 | 0.00 | JAVA0264 Integer math in long context - check for overflow | |
| JAVA0265 | 0.00 | JAVA0265 Use of Throwable.printStackTrace() | |
| JAVA0266 | 0.00 | JAVA0266 Use of System.out | |
| JAVA0267 | 0.00 | JAVA0267 Use of System.err | |
| JAVA0269 | 0.00 | JAVA0269 Contents of StringBuffer never used | |
| JAVA0270 | 0.00 | JAVA0270 Use Java 5.0 enhanced for loop construct to iterate over all elements in an array | |
| JAVA0271 | 0.00 | JAVA0271 Minimize use of on-demand (.*) static imports | |
| JAVA0272 | 0.00 | JAVA0272 Thread.run() called | |
| JAVA0273 | 0.00 | JAVA0273 Non-final derivative of Thread calls start() in constructor | |
| JAVA0274 | 0.00 | JAVA0274 Serializable class has a synchronized readObject() | |
| JAVA0275 | 0.00 | JAVA0275 Serializable class has a synchronized writeObject() and no other synchronized methods | |
| JAVA0276 | 0.00 | JAVA0276 Unnecessary use of String constructor | |
| JAVA0277 | 0.00 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0278 | 0.00 | JAVA0278 Unnecessary use of Boolean constructor | |
| JAVA0279 | 0.00 | JAVA0279 Serialization method readObject or readObjectNoData calls an overridable method | |
| JAVA0280 | 0.00 | JAVA0280 IllegalMonitorStateException caught | |
| JAVA0281 | 0.00 | JAVA0281 Iterator.next() not called in loop | |
| JAVA0282 | 0.00 | JAVA0282 Call to Iterator.next() in loop which does not test Iterator.hasNext() | |
| JAVA0283 | 0.00 | JAVA0283 Control variable not updated in loop body | |
| JAVA0284 | 0.00 | JAVA0284 Explicit garbage collection | |
| JAVA0285 | 0.00 | JAVA0285 Dereference of potentially null variable | |
| JAVA0286 | 0.00 | JAVA0286 Dereference of null variable | |
| JAVA0287 | 1.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 914.00 | Number of lines in the source file | |
| LINE_COMMENT | 26.00 | Number of line comments | |
| LOC | 263.00 | Lines of code | |
| LOGICAL_LINES | 118.00 | Number of statements | |
| LOOPS | 1.00 | Number of loops | |
| NEST_DEPTH | 5.00 | Maximum nesting depth | |
| OPERANDS | 656.00 | Number of operands | |
| OPERATORS | 1242.00 | Number of operators | |
| PARAMS | 62.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 1898.00 | Halstead program length | |
| PROGRAM_VOCAB | 252.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 72.00 | Number of return points from functions | |
| SIZE | 37071.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 221.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 31.00 | Number of unique operators | |
| WHITESPACE | 57.00 | Number of whitespace lines | |