FastArrayList.java
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|---|---|---|
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org.apache.commons.collections |
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Commons Collections |
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These are the metrics that contribute to the Enerjy Score for this file, ranked by impact. So the metrics listed at the top influence the score to a greater extent that the metrics listed at the bottom.
| Metric | Description | |
|---|---|---|
| BLOCKS | Number of blocks |  |
| RETURNS | Number of return points from functions | |
| FUNCTIONS | Number of function declarations | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| SIZE | Size of the file in bytes | |
| CYCLOMATIC | Cyclomatic complexity | |
| LINES | Number of lines in the source file | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| DOC_COMMENT | Number of javadoc comment lines | |
| LOC | Lines of code | |
| ELOC | Effective lines of code | |
| DECL_COMMENTS | Comments in declarations | |
| OPERATORS | Number of operators | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| COMMENTS | Comment lines | |
| PROGRAM_LENGTH | Halstead program length | |
| LOGICAL_LINES | Number of statements | |
| PARAMS | Number of formal parameter declarations | |
| WHITESPACE | Number of whitespace lines | |
| OPERANDS | Number of operands | |
| EXITS | Procedure exits | |
| JAVA0128 | JAVA0128 Public constructor in non-public class | |
| UNIQUE_OPERANDS | Number of unique operands | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| JAVA0277 | JAVA0277 Iterator.next() implementation does not throw NoSuchElementException | |
| JAVA0136 | JAVA0136 N methods defined in class (maximum: M) | |
| JAVA0254 | JAVA0254 Use enhanced for loop construct instead of Iterator | |
| JAVA0058 | JAVA0058 Constructor calls super() | |
| JAVA0096 | JAVA0096 Field in nested class hides outer field | |
| JAVA0244 | JAVA0244 Field or method name in subclass differs only by case from inherited field or method | |
| PROGRAM_VOLUME | Halstead program volume | |
| UNIQUE_OPERATORS | Number of unique operators | |
| JAVA0126 | JAVA0126 Method declares unchecked exception in throws | |
| EXEC_COMMENTS | Comments in executable code | |
| JAVA0132 | JAVA0132 Method overload with compatible signature | |
| LINE_COMMENT | Number of line comments | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| 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.util.ArrayList;
import java.util.Collection;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
/**
* <p>A customized implementation of <code>java.util.ArrayList</code> designed
* to operate in a multithreaded environment where the large majority of
* method calls are read-only, instead of structural changes. When operating
* in "fast" mode, read calls are non-synchronized and write calls perform the
* following steps:</p>
* <ul>
* <li>Clone the existing collection
* <li>Perform the modification on the clone
* <li>Replace the existing collection with the (modified) clone
* </ul>
* <p>When first created, objects of this class default to "slow" mode, where
* all accesses of any type are synchronized but no cloning takes place. This
* is appropriate for initially populating the collection, followed by a switch
* to "fast" mode (by calling <code>setFast(true)</code>) after initialization
* is complete.</p>
*
* <p><strong>NOTE</strong>: If you are creating and accessing an
* <code>ArrayList</code> only within a single thread, you should use
* <code>java.util.ArrayList</code> directly (with no synchronization), for
* maximum performance.</p>
*
* <p><strong>NOTE</strong>: <i>This class is not cross-platform.
* Using it may cause unexpected failures on some architectures.</i>
* It suffers from the same problems as the double-checked locking idiom.
* In particular, the instruction that clones the internal collection and the
* instruction that sets the internal reference to the clone can be executed
* or perceived out-of-order. This means that any read operation might fail
* unexpectedly, as it may be reading the state of the internal collection
* before the internal collection is fully formed.
* For more information on the double-checked locking idiom, see the
* <a href="http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html">
* Double-Checked Locking Idiom Is Broken Declaration</a>.</p>
*
* @since Commons Collections 1.0
* @version $Revision: 480452 $ $Date: 2006-11-29 02:45:14 -0500 (Wed, 29 Nov 2006) $
*
* @author Craig R. McClanahan
* @author Stephen Colebourne
*/
public class FastArrayList extends ArrayList {
// ----------------------------------------------------------- Constructors
/**
* Construct a an empty list.
*/
public FastArrayList() {
super();
this.list = new ArrayList();
}
/**
* Construct an empty list with the specified capacity.
*
* @param capacity The initial capacity of the empty list
*/
public FastArrayList(int capacity) {
super();
this.list = new ArrayList(capacity);
}
/**
* Construct a list containing the elements of the specified collection,
* in the order they are returned by the collection's iterator.
*
* @param collection The collection whose elements initialize the contents
* of this list
*/
public FastArrayList(Collection collection) {
super();
this.list = new ArrayList(collection);
}
// ----------------------------------------------------- Instance Variables
/**
* The underlying list we are managing.
*/
protected ArrayList list = null;
// ------------------------------------------------------------- Properties
/**
* Are we operating in "fast" mode?
*/
protected boolean fast = false;
/**
* Returns true if this list is operating in fast mode.
*
* @return true if this list is operating in fast mode
*/
public boolean getFast() {
return (this.fast);
}
/**
* Sets whether this list will operate in fast mode.
*
* @param fast true if the list should operate in fast mode
*/
public void setFast(boolean fast) {
this.fast = fast;
}
// --------------------------------------------------------- Public Methods
/**
* Appends the specified element to the end of this list.
*
* @param element The element to be appended
*/
public boolean add(Object element) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
boolean result = temp.add(element);
list = temp;
return (result);
}
} else {
synchronized (list) {
return (list.add(element));
}
}
}
/**
* Insert the specified element at the specified position in this list,
* and shift all remaining elements up one position.
*
* @param index Index at which to insert this element
* @param element The element to be inserted
*
* @exception IndexOutOfBoundsException if the index is out of range
*/
public void add(int index, Object element) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
temp.add(index, element);
list = temp;
}
} else {
synchronized (list) {
list.add(index, element);
}
}
}
/**
* Append all of the elements in the specified Collection to the end
* of this list, in the order that they are returned by the specified
* Collection's Iterator.
*
* @param collection The collection to be appended
*/
public boolean addAll(Collection collection) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
boolean result = temp.addAll(collection);
list = temp;
return (result);
}
} else {
synchronized (list) {
return (list.addAll(collection));
}
}
}
/**
* Insert all of the elements in the specified Collection at the specified
* position in this list, and shift any previous elements upwards as
* needed.
*
* @param index Index at which insertion takes place
* @param collection The collection to be added
*
* @exception IndexOutOfBoundsException if the index is out of range
*/
public boolean addAll(int index, Collection collection) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
boolean result = temp.addAll(index, collection);
list = temp;
return (result);
}
} else {
synchronized (list) {
return (list.addAll(index, collection));
}
}
}
/**
* Remove all of the elements from this list. The list will be empty
* after this call returns.
*
* @exception UnsupportedOperationException if <code>clear()</code>
* is not supported by this list
*/
public void clear() {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
temp.clear();
list = temp;
}
} else {
synchronized (list) {
list.clear();
}
}
}
/**
* Return a shallow copy of this <code>FastArrayList</code> instance.
* The elements themselves are not copied.
*/
public Object clone() {
FastArrayList results = null;
if (fast) {
results = new FastArrayList(list);
} else {
synchronized (list) {
results = new FastArrayList(list);
}
}
results.setFast(getFast());
return (results);
}
/**
* Return <code>true</code> if this list contains the specified element.
*
* @param element The element to test for
*/
public boolean contains(Object element) {
if (fast) {
return (list.contains(element));
} else {
synchronized (list) {
return (list.contains(element));
}
}
}
/**
* Return <code>true</code> if this list contains all of the elements
* in the specified Collection.
*
* @param collection Collection whose elements are to be checked
*/
public boolean containsAll(Collection collection) {
if (fast) {
return (list.containsAll(collection));
} else {
synchronized (list) {
return (list.containsAll(collection));
}
}
}
/**
* Increase the capacity of this <code>ArrayList</code> instance, if
* necessary, to ensure that it can hold at least the number of elements
* specified by the minimum capacity argument.
*
* @param capacity The new minimum capacity
*/
public void ensureCapacity(int capacity) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
temp.ensureCapacity(capacity);
list = temp;
}
} else {
synchronized (list) {
list.ensureCapacity(capacity);
}
}
}
/**
* Compare the specified object with this list for equality. This
* implementation uses exactly the code that is used to define the
* list equals function in the documentation for the
* <code>List.equals</code> method.
*
* @param o Object to be compared to this list
*/
public boolean equals(Object o) {
// Simple tests that require no synchronization
if (o == this)
return (true);
else if (!(o instanceof List))
return (false);
List lo = (List) o;
// Compare the sets of elements for equality
if (fast) {
ListIterator li1 = list.listIterator();
ListIterator li2 = lo.listIterator();
while (li1.hasNext() && li2.hasNext()) {
Object o1 = li1.next();
Object o2 = li2.next();
if (!(o1 == null ? o2 == null : o1.equals(o2)))
return (false);
}
return (!(li1.hasNext() || li2.hasNext()));
} else {
synchronized (list) {
ListIterator li1 = list.listIterator();
ListIterator li2 = lo.listIterator();
while (li1.hasNext() && li2.hasNext()) {
Object o1 = li1.next();
Object o2 = li2.next();
if (!(o1 == null ? o2 == null : o1.equals(o2)))
return (false);
}
return (!(li1.hasNext() || li2.hasNext()));
}
}
}
/**
* Return the element at the specified position in the list.
*
* @param index The index of the element to return
*
* @exception IndexOutOfBoundsException if the index is out of range
*/
public Object get(int index) {
if (fast) {
return (list.get(index));
} else {
synchronized (list) {
return (list.get(index));
}
}
}
/**
* Return the hash code value for this list. This implementation uses
* exactly the code that is used to define the list hash function in the
* documentation for the <code>List.hashCode</code> method.
*/
public int hashCode() {
if (fast) {
int hashCode = 1;
java.util.Iterator i = list.iterator();
while (i.hasNext()) {
Object o = i.next();
hashCode = 31 * hashCode + (o == null ? 0 : o.hashCode());
}
return (hashCode);
} else {
synchronized (list) {
int hashCode = 1;
java.util.Iterator i = list.iterator();
while (i.hasNext()) {
Object o = i.next();
hashCode = 31 * hashCode + (o == null ? 0 : o.hashCode());
}
return (hashCode);
}
}
}
/**
* Search for the first occurrence of the given argument, testing
* for equality using the <code>equals()</code> method, and return
* the corresponding index, or -1 if the object is not found.
*
* @param element The element to search for
*/
public int indexOf(Object element) {
if (fast) {
return (list.indexOf(element));
} else {
synchronized (list) {
return (list.indexOf(element));
}
}
}
/**
* Test if this list has no elements.
*/
public boolean isEmpty() {
if (fast) {
return (list.isEmpty());
} else {
synchronized (list) {
return (list.isEmpty());
}
}
}
/**
* Return an iterator over the elements in this list in proper sequence.
* <p>
* <b>Thread safety</b><br />
* The iterator returned is thread-safe ONLY in FAST mode.
* In slow mode there is no way to synchronize, or make the iterator thread-safe.
* <p>
* In fast mode iteration and modification may occur in parallel on different threads,
* however there is a restriction. Modification must be EITHER via the Iterator
* interface methods OR the List interface. If a mixture of modification
* methods is used a ConcurrentModificationException is thrown from the iterator
* modification method. If the List modification methods are used the changes are
* NOT visible in the iterator (it shows the list contents at the time the iterator
* was created).
*
* @return the iterator
*/
public Iterator iterator() {
if (fast) {
return new ListIter(0);
} else {
return list.iterator();
}
}
/**
* Search for the last occurrence of the given argument, testing
* for equality using the <code>equals()</code> method, and return
* the corresponding index, or -1 if the object is not found.
*
* @param element The element to search for
*/
public int lastIndexOf(Object element) {
if (fast) {
return (list.lastIndexOf(element));
} else {
synchronized (list) {
return (list.lastIndexOf(element));
}
}
}
/**
* Return an iterator of the elements of this list, in proper sequence.
* <p>
* <b>Thread safety</b><br />
* The iterator returned is thread-safe ONLY in FAST mode.
* In slow mode there is no way to synchronize, or make the iterator thread-safe.
* <p>
* In fast mode iteration and modification may occur in parallel on different threads,
* however there is a restriction. Modification must be EITHER via the Iterator
* interface methods OR the List interface. If a mixture of modification
* methods is used a ConcurrentModificationException is thrown from the iterator
* modification method. If the List modification methods are used the changes are
* NOT visible in the iterator (it shows the list contents at the time the iterator
* was created).
*
* @return the list iterator
*/
public ListIterator listIterator() {
if (fast) {
return new ListIter(0);
} else {
return list.listIterator();
}
}
/**
* Return an iterator of the elements of this list, in proper sequence,
* starting at the specified position.
* <p>
* <b>Thread safety</b><br />
* The iterator returned is thread-safe ONLY in FAST mode.
* In slow mode there is no way to synchronize, or make the iterator thread-safe.
* <p>
* In fast mode iteration and modification may occur in parallel on different threads,
* however there is a restriction. Modification must be EITHER via the Iterator
* interface methods OR the List interface. If a mixture of modification
* methods is used a ConcurrentModificationException is thrown from the iterator
* modification method. If the List modification methods are used the changes are
* NOT visible in the iterator (it shows the list contents at the time the iterator
* was created).
*
* @param index The starting position of the iterator to return
* @return the list iterator
* @exception IndexOutOfBoundsException if the index is out of range
*/
public ListIterator listIterator(int index) {
if (fast) {
return new ListIter(index);
} else {
return list.listIterator(index);
}
}
/**
* Remove the element at the specified position in the list, and shift
* any subsequent elements down one position.
*
* @param index Index of the element to be removed
*
* @exception IndexOutOfBoundsException if the index is out of range
*/
public Object remove(int index) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
Object result = temp.remove(index);
list = temp;
return (result);
}
} else {
synchronized (list) {
return (list.remove(index));
}
}
}
/**
* Remove the first occurrence of the specified element from the list,
* and shift any subsequent elements down one position.
*
* @param element Element to be removed
*/
public boolean remove(Object element) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
boolean result = temp.remove(element);
list = temp;
return (result);
}
} else {
synchronized (list) {
return (list.remove(element));
}
}
}
/**
* Remove from this collection all of its elements that are contained
* in the specified collection.
*
* @param collection Collection containing elements to be removed
*
* @exception UnsupportedOperationException if this optional operation
* is not supported by this list
*/
public boolean removeAll(Collection collection) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
boolean result = temp.removeAll(collection);
list = temp;
return (result);
}
} else {
synchronized (list) {
return (list.removeAll(collection));
}
}
}
/**
* Remove from this collection all of its elements except those that are
* contained in the specified collection.
*
* @param collection Collection containing elements to be retained
*
* @exception UnsupportedOperationException if this optional operation
* is not supported by this list
*/
public boolean retainAll(Collection collection) {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
boolean result = temp.retainAll(collection);
list = temp;
return (result);
}
} else {
synchronized (list) {
return (list.retainAll(collection));
}
}
}
/**
* Replace the element at the specified position in this list with
* the specified element. Returns the previous object at that position.
* <br><br>
* <strong>IMPLEMENTATION NOTE</strong> - This operation is specifically
* documented to not be a structural change, so it is safe to be performed
* without cloning.
*
* @param index Index of the element to replace
* @param element The new element to be stored
*
* @exception IndexOutOfBoundsException if the index is out of range
*/
public Object set(int index, Object element) {
if (fast) {
return (list.set(index, element));
} else {
synchronized (list) {
return (list.set(index, element));
}
}
}
/**
* Return the number of elements in this list.
*/
public int size() {
if (fast) {
return (list.size());
} else {
synchronized (list) {
return (list.size());
}
}
}
/**
* Return a view of the portion of this list between fromIndex
* (inclusive) and toIndex (exclusive). The returned list is backed
* by this list, so non-structural changes in the returned list are
* reflected in this list. The returned list supports
* all of the optional list operations supported by this list.
*
* @param fromIndex The starting index of the sublist view
* @param toIndex The index after the end of the sublist view
*
* @exception IndexOutOfBoundsException if an index is out of range
*/
public List subList(int fromIndex, int toIndex) {
if (fast) {
return new SubList(fromIndex, toIndex);
} else {
return list.subList(fromIndex, toIndex);
}
}
/**
* Return an array containing all of the elements in this list in the
* correct order.
*/
public Object[] toArray() {
if (fast) {
return (list.toArray());
} else {
synchronized (list) {
return (list.toArray());
}
}
}
/**
* Return an array containing all of the elements in this list in the
* correct order. The runtime type of the returned array is that of
* the specified array. If the list fits in the specified array, it is
* returned therein. Otherwise, a new array is allocated with the
* runtime type of the specified array, and the size of this list.
*
* @param array Array defining the element type of the returned list
*
* @exception ArrayStoreException if the runtime type of <code>array</code>
* is not a supertype of the runtime type of every element in this list
*/
public Object[] toArray(Object array[]) {
if (fast) {
return (list.toArray(array));
} else {
synchronized (list) {
return (list.toArray(array));
}
}
}
/**
* Return a String representation of this object.
*/
public String toString() {
StringBuffer sb = new StringBuffer("FastArrayList[");
sb.append(list.toString());
sb.append("]");
return (sb.toString());
}
/**
* Trim the capacity of this <code>ArrayList</code> instance to be the
* list's current size. An application can use this operation to minimize
* the storage of an <code>ArrayList</code> instance.
*/
public void trimToSize() {
if (fast) {
synchronized (this) {
ArrayList temp = (ArrayList) list.clone();
temp.trimToSize();
list = temp;
}
} else {
synchronized (list) {
list.trimToSize();
}
}
}
private class SubList implements List {
private int first;
private int last;
private List expected;
public SubList(int first, int last) {
this.first = first;
this.last = last;
this.expected = list;
}
private List get(List l) {
if (list != expected) {
throw new ConcurrentModificationException();
}
return l.subList(first, last);
}
public void clear() {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
get(temp).clear();
last = first;
list = temp;
expected = temp;
}
} else {
synchronized (list) {
get(expected).clear();
}
}
}
public boolean remove(Object o) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
boolean r = get(temp).remove(o);
if (r) last--;
list = temp;
expected = temp;
return r;
}
} else {
synchronized (list) {
return get(expected).remove(o);
}
}
}
public boolean removeAll(Collection o) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
List sub = get(temp);
boolean r = sub.removeAll(o);
if (r) last = first + sub.size();
list = temp;
expected = temp;
return r;
}
} else {
synchronized (list) {
return get(expected).removeAll(o);
}
}
}
public boolean retainAll(Collection o) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
List sub = get(temp);
boolean r = sub.retainAll(o);
if (r) last = first + sub.size();
list = temp;
expected = temp;
return r;
}
} else {
synchronized (list) {
return get(expected).retainAll(o);
}
}
}
public int size() {
if (fast) {
return get(expected).size();
} else {
synchronized (list) {
return get(expected).size();
}
}
}
public boolean isEmpty() {
if (fast) {
return get(expected).isEmpty();
} else {
synchronized (list) {
return get(expected).isEmpty();
}
}
}
public boolean contains(Object o) {
if (fast) {
return get(expected).contains(o);
} else {
synchronized (list) {
return get(expected).contains(o);
}
}
}
public boolean containsAll(Collection o) {
if (fast) {
return get(expected).containsAll(o);
} else {
synchronized (list) {
return get(expected).containsAll(o);
}
}
}
public Object[] toArray(Object[] o) {
if (fast) {
return get(expected).toArray(o);
} else {
synchronized (list) {
return get(expected).toArray(o);
}
}
}
public Object[] toArray() {
if (fast) {
return get(expected).toArray();
} else {
synchronized (list) {
return get(expected).toArray();
}
}
}
public boolean equals(Object o) {
if (o == this) return true;
if (fast) {
return get(expected).equals(o);
} else {
synchronized (list) {
return get(expected).equals(o);
}
}
}
public int hashCode() {
if (fast) {
return get(expected).hashCode();
} else {
synchronized (list) {
return get(expected).hashCode();
}
}
}
public boolean add(Object o) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
boolean r = get(temp).add(o);
if (r) last++;
list = temp;
expected = temp;
return r;
}
} else {
synchronized (list) {
return get(expected).add(o);
}
}
}
public boolean addAll(Collection o) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
boolean r = get(temp).addAll(o);
if (r) last += o.size();
list = temp;
expected = temp;
return r;
}
} else {
synchronized (list) {
return get(expected).addAll(o);
}
}
}
public void add(int i, Object o) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
get(temp).add(i, o);
last++;
list = temp;
expected = temp;
}
} else {
synchronized (list) {
get(expected).add(i, o);
}
}
}
public boolean addAll(int i, Collection o) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
boolean r = get(temp).addAll(i, o);
list = temp;
if (r) last += o.size();
expected = temp;
return r;
}
} else {
synchronized (list) {
return get(expected).addAll(i, o);
}
}
}
public Object remove(int i) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
Object o = get(temp).remove(i);
last--;
list = temp;
expected = temp;
return o;
}
} else {
synchronized (list) {
return get(expected).remove(i);
}
}
}
public Object set(int i, Object a) {
if (fast) {
synchronized (FastArrayList.this) {
ArrayList temp = (ArrayList) list.clone();
Object o = get(temp).set(i, a);
list = temp;
expected = temp;
return o;
}
} else {
synchronized (list) {
return get(expected).set(i, a);
}
}
}
public Iterator iterator() {
return new SubListIter(0);
}
public ListIterator listIterator() {
return new SubListIter(0);
}
public ListIterator listIterator(int i) {
return new SubListIter(i);
}
public Object get(int i) {
if (fast) {
return get(expected).get(i);
} else {
synchronized (list) {
return get(expected).get(i);
}
}
}
public int indexOf(Object o) {
if (fast) {
return get(expected).indexOf(o);
} else {
synchronized (list) {
return get(expected).indexOf(o);
}
}
}
public int lastIndexOf(Object o) {
if (fast) {
return get(expected).lastIndexOf(o);
} else {
synchronized (list) {
return get(expected).lastIndexOf(o);
}
}
}
public List subList(int f, int l) {
if (list != expected) {
throw new ConcurrentModificationException();
}
return new SubList(first + f, f + l);
}
private class SubListIter implements ListIterator {
private List expected;
private ListIterator iter;
private int lastReturnedIndex = -1;
public SubListIter(int i) {
this.expected = list;
this.iter = SubList.this.get(expected).listIterator(i);
}
private void checkMod() {
if (list != expected) {
throw new ConcurrentModificationException();
}
}
List get() {
return SubList.this.get(expected);
}
public boolean hasNext() {
checkMod();
return iter.hasNext();
}
public Object next() {
checkMod();
lastReturnedIndex = iter.nextIndex();
return iter.next();
}
public boolean hasPrevious() {
checkMod();
return iter.hasPrevious();
}
public Object previous() {
checkMod();
lastReturnedIndex = iter.previousIndex();
return iter.previous();
}
public int previousIndex() {
checkMod();
return iter.previousIndex();
}
public int nextIndex() {
checkMod();
return iter.nextIndex();
}
public void remove() {
checkMod();
if (lastReturnedIndex < 0) {
throw new IllegalStateException();
}
get().remove(lastReturnedIndex);
last--;
expected = list;
iter = get().listIterator(lastReturnedIndex);
lastReturnedIndex = -1;
}
public void set(Object o) {
checkMod();
if (lastReturnedIndex < 0) {
throw new IllegalStateException();
}
get().set(lastReturnedIndex, o);
expected = list;
iter = get().listIterator(previousIndex() + 1);
}
public void add(Object o) {
checkMod();
int i = nextIndex();
get().add(i, o);
last++;
expected = list;
iter = get().listIterator(i + 1);
lastReturnedIndex = -1;
}
}
}
private class ListIter implements ListIterator {
private List expected;
private ListIterator iter;
private int lastReturnedIndex = -1;
public ListIter(int i) {
this.expected = list;
this.iter = get().listIterator(i);
}
private void checkMod() {
if (list != expected) {
throw new ConcurrentModificationException();
}
}
List get() {
return expected;
}
public boolean hasNext() {
return iter.hasNext();
}
public Object next() {
lastReturnedIndex = iter.nextIndex();
return iter.next();
}
public boolean hasPrevious() {
return iter.hasPrevious();
}
public Object previous() {
lastReturnedIndex = iter.previousIndex();
return iter.previous();
}
public int previousIndex() {
return iter.previousIndex();
}
public int nextIndex() {
return iter.nextIndex();
}
public void remove() {
checkMod();
if (lastReturnedIndex < 0) {
throw new IllegalStateException();
}
get().remove(lastReturnedIndex);
expected = list;
iter = get().listIterator(lastReturnedIndex);
lastReturnedIndex = -1;
}
public void set(Object o) {
checkMod();
if (lastReturnedIndex < 0) {
throw new IllegalStateException();
}
get().set(lastReturnedIndex, o);
expected = list;
iter = get().listIterator(previousIndex() + 1);
}
public void add(Object o) {
checkMod();
int i = nextIndex();
get().add(i, o);
expected = list;
iter = get().listIterator(i + 1);
lastReturnedIndex = -1;
}
}
}
The table below shows all metrics for FastArrayList.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 261.00 | Number of blocks | |
| BLOCK_COMMENT | 16.00 | Number of block comment lines | |
| COMMENTS | 328.00 | Comment lines | |
| COMMENT_DENSITY | 0.57 | Comment density | |
| COMPARISONS | 34.00 | Number of comparison operators | |
| CYCLOMATIC | 165.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 42.00 | Comments in declarations | |
| DOC_COMMENT | 306.00 | Number of javadoc comment lines | |
| ELOC | 576.00 | Effective lines of code | |
| EXEC_COMMENTS | 2.00 | Comments in executable code | |
| EXITS | 75.00 | Procedure exits | |
| FUNCTIONS | 85.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 96.87 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 197.00 | 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 | 0.00 | 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 | 11.00 | 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 | 0.00 | JAVA0057 Unnecessary default constructor | |
| JAVA0058 | 3.00 | 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 | 1.00 | 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 | 22.00 | 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 | 3.00 | 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 | 3.00 | 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 | 2.00 | 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 | 2.00 | 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 | 0.00 | 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 | 1.00 | 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 | 1.00 | 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 | 1.00 | 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 | 2.00 | 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 | 0.00 | JAVA0258 Implement Iterable for foreach compatibility | |
| JAVA0259 | 1.00 | 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 | 2.00 | 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 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 1333.00 | Number of lines in the source file | |
| LINE_COMMENT | 6.00 | Number of line comments | |
| LOC | 792.00 | Lines of code | |
| LOGICAL_LINES | 307.00 | Number of statements | |
| LOOPS | 4.00 | Number of loops | |
| NEST_DEPTH | 4.00 | Maximum nesting depth | |
| OPERANDS | 1227.00 | Number of operands | |
| OPERATORS | 3022.00 | Number of operators | |
| PARAMS | 57.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 4249.00 | Halstead program length | |
| PROGRAM_VOCAB | 352.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 140.00 | Number of return points from functions | |
| SIZE | 38187.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 304.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 48.00 | Number of unique operators | |
| WHITESPACE | 213.00 | Number of whitespace lines | |