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/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001, 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
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* notice, this list of conditions and the following disclaimer.
*
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* if any, must include the following acknowledgment:
* "This product includes software developed by the
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* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
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* 4. The names "Xerces" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
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* 5. Products derived from this software may not be called "Apache",
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
*
* The hash code uses the same algorithm as SymbolTable class.
*
* @author Elena Litani
* @version $Id: SymbolHash.java,v 1.3 2007-07-19 22:33:16 ofung 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
*/
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
*/
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