com.sun.org.apache.xerces.internal.util.SymbolHash Maven / Gradle / Ivy
Show all versions of jaxp-ri Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* 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 com.sun.org.apache.xerces.internal.util;
/**
* This class is an unsynchronized hash table primary used for String
* to Object mapping.
*
* The hash code uses the same algorithm as SymbolTable class.
*
* @author Elena Litani
* @version $Id: SymbolHash.java,v 1.7 2010-11-01 04:40:14 joehw Exp $
*/
public class SymbolHash {
//
// Constants
//
/** Default table size. */
protected int fTableSize = 101;
//
// Data
//
/** Buckets. */
protected Entry[] fBuckets;
/** Number of elements. */
protected int fNum = 0;
//
// Constructors
//
/** Constructs a key table with the default size. */
public SymbolHash() {
fBuckets = new Entry[fTableSize];
}
/**
* Constructs a key table with a given size.
*
* @param size the size of the key table.
*/
public SymbolHash(int size) {
fTableSize = size;
fBuckets = new Entry[fTableSize];
}
//
// Public methods
//
/**
* Adds the key/value mapping to the key table. If the key already exists,
* the previous value associated with this key is overwritten by the new
* value.
*
* @param key
* @param value
*/
public void put(Object key, Object value) {
int bucket = (key.hashCode() & 0x7FFFFFFF) % fTableSize;
Entry entry = search(key, bucket);
// replace old value
if (entry != null) {
entry.value = value;
}
// create new entry
else {
entry = new Entry(key, value, fBuckets[bucket]);
fBuckets[bucket] = entry;
fNum++;
}
}
/**
* Get the value associated with the given key.
*
* @param key
* @return the value associated with the given key.
*/
public Object get(Object key) {
int bucket = (key.hashCode() & 0x7FFFFFFF) % fTableSize;
Entry entry = search(key, bucket);
if (entry != null) {
return entry.value;
}
return null;
}
/**
* Get the number of key/value pairs stored in this table.
*
* @return the number of key/value pairs stored in this table.
*/
public int getLength() {
return fNum;
}
/**
* Add all values to the given array. The array must have enough entry.
*
* @param elements the array to store the elements
* @param from where to start store element in the array
* @return number of elements copied to the array
*/
public int getValues(Object[] elements, int from) {
for (int i=0, j=0; i