TreeList.java
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|---|---|---|
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org.apache.commons.collections.list |
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Commons Collections |
View: Reasons, Metrics, Source Code
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 | |
|---|---|---|
| DECL_COMMENTS | Comments in declarations |  |
| LINE_COMMENT | Number of line comments | |
| COMMENTS | Comment lines | |
| DOC_COMMENT | Number of javadoc comment lines | |
| SIZE | Size of the file in bytes | |
| CYCLOMATIC | Cyclomatic complexity | |
| RETURNS | Number of return points from functions | |
| JAVA0110 | JAVA0110 Incorrect javadoc: no @return tag | |
| FUNCTIONS | Number of function declarations | |
| COMPARISONS | Number of comparison operators | |
| INTERFACE_COMPLEXITY | Interface complexity | |
| BLOCKS | Number of blocks | |
| LINES | Number of lines in the source file | |
| LOGICAL_LINES | Number of statements | |
| JAVA0108 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| LOC | Lines of code | |
| ELOC | Effective lines of code | |
| JAVA0034 | JAVA0034 Missing braces in if statement | |
| OPERATORS | Number of operators | |
| PARAMS | Number of formal parameter declarations | |
| PROGRAM_LENGTH | Halstead program length | |
| OPERANDS | Number of operands | |
| JAVA0058 | JAVA0058 Constructor calls super() | |
| JAVA0010 | JAVA0010 Non-instantiable class does not contain a non-private static member | |
| JAVA0130 | JAVA0130 Non-static method does not use instance fields | |
| UNIQUE_OPERATORS | Number of unique operators | |
| JAVA0117 | JAVA0117 Missing javadoc: method 'method' | |
| PROGRAM_VOLUME | Halstead program volume | |
| JAVA0136 | JAVA0136 N methods defined in class (maximum: M) | |
| EXITS | Procedure exits | |
| LOOPS | Number of loops | |
| PROGRAM_VOCAB | Halstead program vocabulary | |
| 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.list;
import java.util.AbstractList;
import java.util.Collection;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import org.apache.commons.collections.OrderedIterator;
/**
* A <code>List</code> implementation that is optimised for fast insertions and
* removals at any index in the list.
* <p>
* This list implementation utilises a tree structure internally to ensure that
* all insertions and removals are O(log n). This provides much faster performance
* than both an <code>ArrayList</code> and a <code>LinkedList</code> where elements
* are inserted and removed repeatedly from anywhere in the list.
* <p>
* The following relative performance statistics are indicative of this class:
* <pre>
* get add insert iterate remove
* TreeList 3 5 1 2 1
* ArrayList 1 1 40 1 40
* LinkedList 5800 1 350 2 325
* </pre>
* <code>ArrayList</code> is a good general purpose list implementation.
* It is faster than <code>TreeList</code> for most operations except inserting
* and removing in the middle of the list. <code>ArrayList</code> also uses less
* memory as <code>TreeList</code> uses one object per entry.
* <p>
* <code>LinkedList</code> is rarely a good choice of implementation.
* <code>TreeList</code> is almost always a good replacement for it, although it
* does use sligtly more memory.
*
* @since Commons Collections 3.1
* @version $Revision: 480452 $ $Date: 2006-11-29 02:45:14 -0500 (Wed, 29 Nov 2006) $
*
* @author Joerg Schmuecker
* @author Stephen Colebourne
*/
public class TreeList extends AbstractList {
// add; toArray; iterator; insert; get; indexOf; remove
// TreeList = 1260;7360;3080; 160; 170;3400; 170;
// ArrayList = 220;1480;1760; 6870; 50;1540; 7200;
// LinkedList = 270;7360;3350;55860;290720;2910;55200;
/** The root node in the AVL tree */
private AVLNode root;
/** The current size of the list */
private int size;
//-----------------------------------------------------------------------
/**
* Constructs a new empty list.
*/
public TreeList() {
super();
}
/**
* Constructs a new empty list that copies the specified list.
*
* @param coll the collection to copy
* @throws NullPointerException if the collection is null
*/
public TreeList(Collection coll) {
super();
addAll(coll);
}
//-----------------------------------------------------------------------
/**
* Gets the element at the specified index.
*
* @param index the index to retrieve
* @return the element at the specified index
*/
public Object get(int index) {
checkInterval(index, 0, size() - 1);
return root.get(index).getValue();
}
/**
* Gets the current size of the list.
*
* @return the current size
*/
public int size() {
return size;
}
/**
* Gets an iterator over the list.
*
* @return an iterator over the list
*/
public Iterator iterator() {
// override to go 75% faster
return listIterator(0);
}
/**
* Gets a ListIterator over the list.
*
* @return the new iterator
*/
public ListIterator listIterator() {
// override to go 75% faster
return listIterator(0);
}
/**
* Gets a ListIterator over the list.
*
* @param fromIndex the index to start from
* @return the new iterator
*/
public ListIterator listIterator(int fromIndex) {
// override to go 75% faster
// cannot use EmptyIterator as iterator.add() must work
checkInterval(fromIndex, 0, size());
return new TreeListIterator(this, fromIndex);
}
/**
* Searches for the index of an object in the list.
*
* @return the index of the object, -1 if not found
*/
public int indexOf(Object object) {
// override to go 75% faster
if (root == null) {
return -1;
}
return root.indexOf(object, root.relativePosition);
}
/**
* Searches for the presence of an object in the list.
*
* @return true if the object is found
*/
public boolean contains(Object object) {
return (indexOf(object) >= 0);
}
/**
* Converts the list into an array.
*
* @return the list as an array
*/
public Object[] toArray() {
// override to go 20% faster
Object[] array = new Object[size()];
if (root != null) {
root.toArray(array, root.relativePosition);
}
return array;
}
//-----------------------------------------------------------------------
/**
* Adds a new element to the list.
*
* @param index the index to add before
* @param obj the element to add
*/
public void add(int index, Object obj) {
modCount++;
checkInterval(index, 0, size());
if (root == null) {
root = new AVLNode(index, obj, null, null);
} else {
root = root.insert(index, obj);
}
size++;
}
/**
* Sets the element at the specified index.
*
* @param index the index to set
* @param obj the object to store at the specified index
* @return the previous object at that index
* @throws IndexOutOfBoundsException if the index is invalid
*/
public Object set(int index, Object obj) {
checkInterval(index, 0, size() - 1);
AVLNode node = root.get(index);
Object result = node.value;
node.setValue(obj);
return result;
}
/**
* Removes the element at the specified index.
*
* @param index the index to remove
* @return the previous object at that index
*/
public Object remove(int index) {
modCount++;
checkInterval(index, 0, size() - 1);
Object result = get(index);
root = root.remove(index);
size--;
return result;
}
/**
* Clears the list, removing all entries.
*/
public void clear() {
modCount++;
root = null;
size = 0;
}
//-----------------------------------------------------------------------
/**
* Checks whether the index is valid.
*
* @param index the index to check
* @param startIndex the first allowed index
* @param endIndex the last allowed index
* @throws IndexOutOfBoundsException if the index is invalid
*/
private void checkInterval(int index, int startIndex, int endIndex) {
if (index < startIndex || index > endIndex) {
throw new IndexOutOfBoundsException("Invalid index:" + index + ", size=" + size());
}
}
//-----------------------------------------------------------------------
/**
* Implements an AVLNode which keeps the offset updated.
* <p>
* This node contains the real work.
* TreeList is just there to implement {@link java.util.List}.
* The nodes don't know the index of the object they are holding. They
* do know however their position relative to their parent node.
* This allows to calculate the index of a node while traversing the tree.
* <p>
* The Faedelung calculation stores a flag for both the left and right child
* to indicate if they are a child (false) or a link as in linked list (true).
*/
static class AVLNode {
/** The left child node or the predecessor if {@link #leftIsPrevious}.*/
private AVLNode left;
/** Flag indicating that left reference is not a subtree but the predecessor. */
private boolean leftIsPrevious;
/** The right child node or the successor if {@link #rightIsNext}. */
private AVLNode right;
/** Flag indicating that right reference is not a subtree but the successor. */
private boolean rightIsNext;
/** How many levels of left/right are below this one. */
private int height;
/** The relative position, root holds absolute position. */
private int relativePosition;
/** The stored element. */
private Object value;
/**
* Constructs a new node with a relative position.
*
* @param relativePosition the relative position of the node
* @param obj the value for the ndoe
* @param rightFollower the node with the value following this one
* @param leftFollower the node with the value leading this one
*/
private AVLNode(int relativePosition, Object obj, AVLNode rightFollower, AVLNode leftFollower) {
this.relativePosition = relativePosition;
value = obj;
rightIsNext = true;
leftIsPrevious = true;
right = rightFollower;
left = leftFollower;
}
/**
* Gets the value.
*
* @return the value of this node
*/
Object getValue() {
return value;
}
/**
* Sets the value.
*
* @param obj the value to store
*/
void setValue(Object obj) {
this.value = obj;
}
/**
* Locate the element with the given index relative to the
* offset of the parent of this node.
*/
AVLNode get(int index) {
int indexRelativeToMe = index - relativePosition;
if (indexRelativeToMe == 0) {
return this;
}
AVLNode nextNode = ((indexRelativeToMe < 0) ? getLeftSubTree() : getRightSubTree());
if (nextNode == null) {
return null;
}
return nextNode.get(indexRelativeToMe);
}
/**
* Locate the index that contains the specified object.
*/
int indexOf(Object object, int index) {
if (getLeftSubTree() != null) {
int result = left.indexOf(object, index + left.relativePosition);
if (result != -1) {
return result;
}
}
if (value == null ? value == object : value.equals(object)) {
return index;
}
if (getRightSubTree() != null) {
return right.indexOf(object, index + right.relativePosition);
}
return -1;
}
/**
* Stores the node and its children into the array specified.
*
* @param array the array to be filled
* @param index the index of this node
*/
void toArray(Object[] array, int index) {
array[index] = value;
if (getLeftSubTree() != null) {
left.toArray(array, index + left.relativePosition);
}
if (getRightSubTree() != null) {
right.toArray(array, index + right.relativePosition);
}
}
/**
* Gets the next node in the list after this one.
*
* @return the next node
*/
AVLNode next() {
if (rightIsNext || right == null) {
return right;
}
return right.min();
}
/**
* Gets the node in the list before this one.
*
* @return the previous node
*/
AVLNode previous() {
if (leftIsPrevious || left == null) {
return left;
}
return left.max();
}
/**
* Inserts a node at the position index.
*
* @param index is the index of the position relative to the position of
* the parent node.
* @param obj is the object to be stored in the position.
*/
AVLNode insert(int index, Object obj) {
int indexRelativeToMe = index - relativePosition;
if (indexRelativeToMe <= 0) {
return insertOnLeft(indexRelativeToMe, obj);
} else {
return insertOnRight(indexRelativeToMe, obj);
}
}
private AVLNode insertOnLeft(int indexRelativeToMe, Object obj) {
AVLNode ret = this;
if (getLeftSubTree() == null) {
setLeft(new AVLNode(-1, obj, this, left), null);
} else {
setLeft(left.insert(indexRelativeToMe, obj), null);
}
if (relativePosition >= 0) {
relativePosition++;
}
ret = balance();
recalcHeight();
return ret;
}
private AVLNode insertOnRight(int indexRelativeToMe, Object obj) {
AVLNode ret = this;
if (getRightSubTree() == null) {
setRight(new AVLNode(+1, obj, right, this), null);
} else {
setRight(right.insert(indexRelativeToMe, obj), null);
}
if (relativePosition < 0) {
relativePosition--;
}
ret = balance();
recalcHeight();
return ret;
}
//-----------------------------------------------------------------------
/**
* Gets the left node, returning null if its a faedelung.
*/
private AVLNode getLeftSubTree() {
return (leftIsPrevious ? null : left);
}
/**
* Gets the right node, returning null if its a faedelung.
*/
private AVLNode getRightSubTree() {
return (rightIsNext ? null : right);
}
/**
* Gets the rightmost child of this node.
*
* @return the rightmost child (greatest index)
*/
private AVLNode max() {
return (getRightSubTree() == null) ? this : right.max();
}
/**
* Gets the leftmost child of this node.
*
* @return the leftmost child (smallest index)
*/
private AVLNode min() {
return (getLeftSubTree() == null) ? this : left.min();
}
/**
* Removes the node at a given position.
*
* @param index is the index of the element to be removed relative to the position of
* the parent node of the current node.
*/
AVLNode remove(int index) {
int indexRelativeToMe = index - relativePosition;
if (indexRelativeToMe == 0) {
return removeSelf();
}
if (indexRelativeToMe > 0) {
setRight(right.remove(indexRelativeToMe), right.right);
if (relativePosition < 0) {
relativePosition++;
}
} else {
setLeft(left.remove(indexRelativeToMe), left.left);
if (relativePosition > 0) {
relativePosition--;
}
}
recalcHeight();
return balance();
}
private AVLNode removeMax() {
if (getRightSubTree() == null) {
return removeSelf();
}
setRight(right.removeMax(), right.right);
if (relativePosition < 0) {
relativePosition++;
}
recalcHeight();
return balance();
}
private AVLNode removeMin() {
if (getLeftSubTree() == null) {
return removeSelf();
}
setLeft(left.removeMin(), left.left);
if (relativePosition > 0) {
relativePosition--;
}
recalcHeight();
return balance();
}
/**
* Removes this node from the tree.
*
* @return the node that replaces this one in the parent
*/
private AVLNode removeSelf() {
if (getRightSubTree() == null && getLeftSubTree() == null) {
return null;
}
if (getRightSubTree() == null) {
if (relativePosition > 0) {
left.relativePosition += relativePosition + (relativePosition > 0 ? 0 : 1);
}
left.max().setRight(null, right);
return left;
}
if (getLeftSubTree() == null) {
right.relativePosition += relativePosition - (relativePosition < 0 ? 0 : 1);
right.min().setLeft(null, left);
return right;
}
if (heightRightMinusLeft() > 0) {
// more on the right, so delete from the right
AVLNode rightMin = right.min();
value = rightMin.value;
if (leftIsPrevious) {
left = rightMin.left;
}
right = right.removeMin();
if (relativePosition < 0) {
relativePosition++;
}
} else {
// more on the left or equal, so delete from the left
AVLNode leftMax = left.max();
value = leftMax.value;
if (rightIsNext) {
right = leftMax.right;
}
AVLNode leftPrevious = left.left;
left = left.removeMax();
if (left == null) {
// special case where left that was deleted was a double link
// only occurs when height difference is equal
left = leftPrevious;
leftIsPrevious = true;
}
if (relativePosition > 0) {
relativePosition--;
}
}
recalcHeight();
return this;
}
//-----------------------------------------------------------------------
/**
* Balances according to the AVL algorithm.
*/
private AVLNode balance() {
switch (heightRightMinusLeft()) {
case 1 :
case 0 :
case -1 :
return this;
case -2 :
if (left.heightRightMinusLeft() > 0) {
setLeft(left.rotateLeft(), null);
}
return rotateRight();
case 2 :
if (right.heightRightMinusLeft() < 0) {
setRight(right.rotateRight(), null);
}
return rotateLeft();
default :
throw new RuntimeException("tree inconsistent!");
}
}
/**
* Gets the relative position.
*/
private int getOffset(AVLNode node) {
if (node == null) {
return 0;
}
return node.relativePosition;
}
/**
* Sets the relative position.
*/
private int setOffset(AVLNode node, int newOffest) {
if (node == null) {
return 0;
}
int oldOffset = getOffset(node);
node.relativePosition = newOffest;
return oldOffset;
}
/**
* Sets the height by calculation.
*/
private void recalcHeight() {
height = Math.max(
getLeftSubTree() == null ? -1 : getLeftSubTree().height,
getRightSubTree() == null ? -1 : getRightSubTree().height) + 1;
}
/**
* Returns the height of the node or -1 if the node is null.
*/
private int getHeight(AVLNode node) {
return (node == null ? -1 : node.height);
}
/**
* Returns the height difference right - left
*/
private int heightRightMinusLeft() {
return getHeight(getRightSubTree()) - getHeight(getLeftSubTree());
}
private AVLNode rotateLeft() {
AVLNode newTop = right; // can't be faedelung!
AVLNode movedNode = getRightSubTree().getLeftSubTree();
int newTopPosition = relativePosition + getOffset(newTop);
int myNewPosition = -newTop.relativePosition;
int movedPosition = getOffset(newTop) + getOffset(movedNode);
setRight(movedNode, newTop);
newTop.setLeft(this, null);
setOffset(newTop, newTopPosition);
setOffset(this, myNewPosition);
setOffset(movedNode, movedPosition);
return newTop;
}
private AVLNode rotateRight() {
AVLNode newTop = left; // can't be faedelung
AVLNode movedNode = getLeftSubTree().getRightSubTree();
int newTopPosition = relativePosition + getOffset(newTop);
int myNewPosition = -newTop.relativePosition;
int movedPosition = getOffset(newTop) + getOffset(movedNode);
setLeft(movedNode, newTop);
newTop.setRight(this, null);
setOffset(newTop, newTopPosition);
setOffset(this, myNewPosition);
setOffset(movedNode, movedPosition);
return newTop;
}
/**
* Sets the left field to the node, or the previous node if that is null
*
* @param node the new left subtree node
* @param previous the previous node in the linked list
*/
private void setLeft(AVLNode node, AVLNode previous) {
leftIsPrevious = (node == null);
left = (leftIsPrevious ? previous : node);
recalcHeight();
}
/**
* Sets the right field to the node, or the next node if that is null
*
* @param node the new left subtree node
* @param next the next node in the linked list
*/
private void setRight(AVLNode node, AVLNode next) {
rightIsNext = (node == null);
right = (rightIsNext ? next : node);
recalcHeight();
}
// private void checkFaedelung() {
// AVLNode maxNode = left.max();
// if (!maxNode.rightIsFaedelung || maxNode.right != this) {
// throw new RuntimeException(maxNode + " should right-faedel to " + this);
// }
// AVLNode minNode = right.min();
// if (!minNode.leftIsFaedelung || minNode.left != this) {
// throw new RuntimeException(maxNode + " should left-faedel to " + this);
// }
// }
//
// private int checkTreeDepth() {
// int hright = (getRightSubTree() == null ? -1 : getRightSubTree().checkTreeDepth());
// // System.out.print("checkTreeDepth");
// // System.out.print(this);
// // System.out.print(" left: ");
// // System.out.print(_left);
// // System.out.print(" right: ");
// // System.out.println(_right);
//
// int hleft = (left == null ? -1 : left.checkTreeDepth());
// if (height != Math.max(hright, hleft) + 1) {
// throw new RuntimeException(
// "height should be max" + hleft + "," + hright + " but is " + height);
// }
// return height;
// }
//
// private int checkLeftSubNode() {
// if (getLeftSubTree() == null) {
// return 0;
// }
// int count = 1 + left.checkRightSubNode();
// if (left.relativePosition != -count) {
// throw new RuntimeException();
// }
// return count + left.checkLeftSubNode();
// }
//
// private int checkRightSubNode() {
// AVLNode right = getRightSubTree();
// if (right == null) {
// return 0;
// }
// int count = 1;
// count += right.checkLeftSubNode();
// if (right.relativePosition != count) {
// throw new RuntimeException();
// }
// return count + right.checkRightSubNode();
// }
/**
* Used for debugging.
*/
public String toString() {
return "AVLNode(" + relativePosition + "," + (left != null) + "," + value +
"," + (getRightSubTree() != null) + ", faedelung " + rightIsNext + " )";
}
}
/**
* A list iterator over the linked list.
*/
static class TreeListIterator implements ListIterator, OrderedIterator {
/** The parent list */
protected final TreeList parent;
/**
* Cache of the next node that will be returned by {@link #next()}.
*/
protected AVLNode next;
/**
* The index of the next node to be returned.
*/
protected int nextIndex;
/**
* Cache of the last node that was returned by {@link #next()}
* or {@link #previous()}.
*/
protected AVLNode current;
/**
* The index of the last node that was returned.
*/
protected int currentIndex;
/**
* The modification count that the list is expected to have. If the list
* doesn't have this count, then a
* {@link java.util.ConcurrentModificationException} may be thrown by
* the operations.
*/
protected int expectedModCount;
/**
* Create a ListIterator for a list.
*
* @param parent the parent list
* @param fromIndex the index to start at
*/
protected TreeListIterator(TreeList parent, int fromIndex) throws IndexOutOfBoundsException {
super();
this.parent = parent;
this.expectedModCount = parent.modCount;
this.next = (parent.root == null ? null : parent.root.get(fromIndex));
this.nextIndex = fromIndex;
this.currentIndex = -1;
}
/**
* Checks the modification count of the list is the value that this
* object expects.
*
* @throws ConcurrentModificationException If the list's modification
* count isn't the value that was expected.
*/
protected void checkModCount() {
if (parent.modCount != expectedModCount) {
throw new ConcurrentModificationException();
}
}
public boolean hasNext() {
return (nextIndex < parent.size());
}
public Object next() {
checkModCount();
if (!hasNext()) {
throw new NoSuchElementException("No element at index " + nextIndex + ".");
}
if (next == null) {
next = parent.root.get(nextIndex);
}
Object value = next.getValue();
current = next;
currentIndex = nextIndex++;
next = next.next();
return value;
}
public boolean hasPrevious() {
return (nextIndex > 0);
}
public Object previous() {
checkModCount();
if (!hasPrevious()) {
throw new NoSuchElementException("Already at start of list.");
}
if (next == null) {
next = parent.root.get(nextIndex - 1);
} else {
next = next.previous();
}
Object value = next.getValue();
current = next;
currentIndex = --nextIndex;
return value;
}
public int nextIndex() {
return nextIndex;
}
public int previousIndex() {
return nextIndex() - 1;
}
public void remove() {
checkModCount();
if (currentIndex == -1) {
throw new IllegalStateException();
}
if (nextIndex == currentIndex) {
// remove() following previous()
next = next.next();
parent.remove(currentIndex);
} else {
// remove() following next()
parent.remove(currentIndex);
nextIndex--;
}
current = null;
currentIndex = -1;
expectedModCount++;
}
public void set(Object obj) {
checkModCount();
if (current == null) {
throw new IllegalStateException();
}
current.setValue(obj);
}
public void add(Object obj) {
checkModCount();
parent.add(nextIndex, obj);
current = null;
currentIndex = -1;
nextIndex++;
expectedModCount++;
}
}
}
The table below shows all metrics for TreeList.java.
| Metric | Value | Description | |
|---|---|---|---|
| BLOCKS | 113.00 | Number of blocks | |
| BLOCK_COMMENT | 16.00 | Number of block comment lines | |
| COMMENTS | 368.00 | Comment lines | |
| COMMENT_DENSITY | 1.02 | Comment density | |
| COMPARISONS | 86.00 | Number of comparison operators | |
| CYCLOMATIC | 129.00 | Cyclomatic complexity | |
| DECL_COMMENTS | 122.00 | Comments in declarations | |
| DOC_COMMENT | 278.00 | Number of javadoc comment lines | |
| ELOC | 360.00 | Effective lines of code | |
| EXEC_COMMENTS | 10.00 | Comments in executable code | |
| EXITS | 42.00 | Procedure exits | |
| FUNCTIONS | 56.00 | Number of function declarations | |
| HALSTEAD_DIFFICULTY | 118.55 | Halstead difficulty | |
| HALSTEAD_EFFORT | 0.00 | Halstead effort | |
| INTERFACE_COMPLEXITY | 124.00 | 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 | 1.00 | 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 | 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 | 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 | 0.00 | 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 | 1.00 | 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 | 7.00 | JAVA0108 Incorrect javadoc: no @param tag for 'parameter' | |
| JAVA0109 | 0.00 | JAVA0109 Incorrect javadoc: no parameter 'parameter' | |
| JAVA0110 | 12.00 | 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 | 1.00 | 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 | 1.00 | JAVA0126 Method declares unchecked exception in throws | |
| JAVA0128 | 0.00 | JAVA0128 Public constructor in non-public class | |
| JAVA0130 | 2.00 | 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 | 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 | 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 | 1.00 | 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 | 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 | 0.00 | JAVA0287 Unnecessary null check | |
| JAVA0288 | 0.00 | JAVA0288 Inconsistent null check | |
| LINES | 916.00 | Number of lines in the source file | |
| LINE_COMMENT | 74.00 | Number of line comments | |
| LOC | 469.00 | Lines of code | |
| LOGICAL_LINES | 234.00 | Number of statements | |
| LOOPS | 0.00 | Number of loops | |
| NEST_DEPTH | 3.00 | Maximum nesting depth | |
| OPERANDS | 839.00 | Number of operands | |
| OPERATORS | 1861.00 | Number of operators | |
| PARAMS | 42.00 | Number of formal parameter declarations | |
| PROGRAM_LENGTH | 2700.00 | Halstead program length | |
| PROGRAM_VOCAB | 236.00 | Halstead program vocabulary | |
| PROGRAM_VOLUME | 0.00 | Halstead program volume | |
| RETURNS | 82.00 | Number of return points from functions | |
| SIZE | 29945.00 | Size of the file in bytes | |
| UNIQUE_OPERANDS | 184.00 | Number of unique operands | |
| UNIQUE_OPERATORS | 52.00 | Number of unique operators | |
| WHITESPACE | 79.00 | Number of whitespace lines | |