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/*
* Copyright (c) 2010, Michael Bien
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of JogAmp nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Michael Bien BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* Created on Sunday, March 28 2010 21:01
*/
package com.jogamp.common.util;
/*
* Note: this map is used as template for other maps.
*/
/**
* Fast HashMap for primitive data. Optimized for being GC friendly.
* Original code is based on the <a href="http://code.google.com/p/skorpios/"> skorpios project</a>
* released under new BSD license.
*
* @author Michael Bien
* @author Simon Goller
*
* @see IntObjectHashMap
* @see IntLongHashMap
* @see LongObjectHashMap
* @see LongLongHashMap
* @see LongIntHashMap
*/
public class /*name*/IntIntHashMap/*name*/ {
private final float loadFactor;
private Entry[] table;
private int size;
private int mask;
private int capacity;
private int threshold;
public /*name*/IntIntHashMap/*name*/() {
this(16, 0.75f);
}
public /*name*/IntIntHashMap/*name*/(int initialCapacity) {
this(initialCapacity, 0.75f);
}
public /*name*/IntIntHashMap/*name*/(int initialCapacity, float loadFactor) {
if (initialCapacity > 1 << 30) {
throw new IllegalArgumentException("initialCapacity is too large.");
}
if (initialCapacity < 0) {
throw new IllegalArgumentException("initialCapacity must be greater than zero.");
}
if (loadFactor <= 0) {
throw new IllegalArgumentException("initialCapacity must be greater than zero.");
}
capacity = 1;
while (capacity < initialCapacity) {
capacity <<= 1;
}
this.loadFactor = loadFactor;
this.threshold = (int) (capacity * loadFactor);
this.table = new Entry[capacity];
this.mask = capacity - 1;
}
public boolean containsValue(/*value*/int/*value*/ value) {
Entry[] table = this.table;
for (int i = table.length; i-- > 0;) {
for (Entry e = table[i]; e != null; e = e.next) {
if (e.value == value) {
return true;
}
}
}
return false;
}
// @SuppressWarnings(value="cast")
public boolean containsKey(/*key*/int/*key*/ key) {
int index = (int) (key & mask);
for (Entry e = table[index]; e != null; e = e.next) {
if (e.key == key) {
return true;
}
}
return false;
}
// @SuppressWarnings(value="cast")
public /*value*/int/*value*/ get(/*key*/int/*key*/ key) {
int index = (int) (key & mask);
for (Entry e = table[index]; e != null; e = e.next) {
if (e.key == key) {
return e.value;
}
}
return /*null*/0/*null*/;
}
// @SuppressWarnings(value="cast")
public /*value*/int/*value*/ put(/*key*/int/*key*/ key, /*value*/int/*value*/ value) {
int index = (int) (key & mask);
// Check if key already exists.
for (Entry e = table[index]; e != null; e = e.next) {
if (e.key != key) {
continue;
}
/*value*/int/*value*/ oldValue = e.value;
e.value = value;
return oldValue;
}
table[index] = new Entry(key, value, table[index]);
if (size++ >= threshold) {
// Rehash.
int newCapacity = 2 * capacity;
Entry[] newTable = new Entry[newCapacity];
Entry[] src = table;
/*key*/int/*key*/ bucketmask = newCapacity - 1;
for (int j = 0; j < src.length; j++) {
Entry e = src[j];
if (e != null) {
src[j] = null;
do {
Entry next = e.next;
index = (int) (e.key & bucketmask);
e.next = newTable[index];
newTable[index] = e;
e = next;
} while (e != null);
}
}
table = newTable;
capacity = newCapacity;
threshold = (int) (newCapacity * loadFactor);
mask = capacity - 1;
}
return /*null*/0/*null*/;
}
// @SuppressWarnings(value="cast")
public /*value*/int/*value*/ remove(/*key*/int/*key*/ key) {
int index = (int) (key & mask);
Entry prev = table[index];
Entry e = prev;
while (e != null) {
Entry next = e.next;
if (e.key == key) {
size--;
if (prev == e) {
table[index] = next;
} else {
prev.next = next;
}
return e.value;
}
prev = e;
e = next;
}
return /*null*/0/*null*/;
}
public int size() {
return size;
}
public void clear() {
Entry[] table = this.table;
for (int index = table.length; --index >= 0;) {
table[index] = null;
}
size = 0;
}
private final static class Entry {
private final /*key*/int/*key*/ key;
private /*value*/int/*value*/ value;
private Entry next;
private Entry(/*key*/int/*key*/ k, /*value*/int/*value*/ v, Entry n) {
key = k;
value = v;
next = n;
}
}
}
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