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Diffstat (limited to 'bundles/org.eclipse.wst.xml.core/src/org/eclipse/wst/xml/core/internal/document/CharacterStringPool.java')
-rw-r--r--bundles/org.eclipse.wst.xml.core/src/org/eclipse/wst/xml/core/internal/document/CharacterStringPool.java100
1 files changed, 0 insertions, 100 deletions
diff --git a/bundles/org.eclipse.wst.xml.core/src/org/eclipse/wst/xml/core/internal/document/CharacterStringPool.java b/bundles/org.eclipse.wst.xml.core/src/org/eclipse/wst/xml/core/internal/document/CharacterStringPool.java
deleted file mode 100644
index 3bdb388dd2..0000000000
--- a/bundles/org.eclipse.wst.xml.core/src/org/eclipse/wst/xml/core/internal/document/CharacterStringPool.java
+++ /dev/null
@@ -1,100 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2009 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
-package org.eclipse.wst.xml.core.internal.document;
-
-import java.util.LinkedHashMap;
-
-/**
- * Organizes a pool of frequently used Strings as character arrays.
- *
- */
-final class CharacterStringPool {
-
- static private LinkedHashMap fPool = new LimitedHashMap();
-
- static private class LimitedHashMap extends LinkedHashMap {
- private static final long serialVersionUID = 1L;
- private static final int MAX = 500;
-
- public LimitedHashMap() {
- super(MAX / 10, .75f, true);
- }
- protected boolean removeEldestEntry(java.util.Map.Entry eldest) {
- return size() > MAX;
- }
- }
-
- static private class CharArray {
- char[] fArray;
- /**
- * Answers a hashcode for the array. Algorithm from org.eclipse.jdt.core.compiler.CharOperation
- *
- * @param array the array for which a hashcode is required
- * @return the hashcode
- * @throws NullPointerException if array is null
- */
- public int hashCode() {
- int length = fArray.length;
- int hash = length == 0 ? 31 : fArray[0];
- if (length < 8) {
- for (int i = length; --i > 0;)
- hash = (hash * 31) + fArray[i];
- } else {
- // 8 characters is enough to compute a decent hash code, don't waste time examining every character
- for (int i = length - 1, last = i > 16 ? i - 16 : 0; i > last; i -= 2)
- hash = (hash * 31) + fArray[i];
- }
- return hash & 0x7FFFFFFF;
- }
-
- public boolean equals(Object obj) {
- if (this == obj)
- return true;
- if (!(obj instanceof CharArray))
- return false;
- CharArray other = (CharArray) obj;
- if (fArray.length != other.fArray.length)
- return false;
- for (int i = 0; i < fArray.length; i++) {
- if (fArray[i] != other.fArray[i])
- return false;
- }
- return true;
- }
- }
-
- private CharacterStringPool() {
- }
-
- /**
- * Returns the character array for <code>string</code>. If
- * the character array is already in the pool for character arrays,
- * the array is reused.
- *
- * @param string the string to retrieve the character array for
- * @return a pooled instance of the character array
- */
- public static char[] getCharString(String string) {
- CharArray array = new CharArray();
- array.fArray = string.toCharArray();
-
- Object obj = null;
- synchronized (fPool) {
- obj = fPool.get(array);
- if (obj == null) {
- obj = array;
- fPool.put(obj, obj);
- }
- }
- return ((CharArray) obj).fArray;
- }
-
-}

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