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/**
* Copyright 2010 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``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 JogAmp Community OR
* CONTRIBUTORS 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.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
/**
* Created on Sunday, March 28 2010 21:01
*/
package com.jogamp.common.util;
import com.jogamp.common.JogampRuntimeException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
/*
* 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 skorpios project
* released under new BSD license.
*
* @author Michael Bien
* @author Simon Goller
* @author Sven Gothel
*
* @see IntObjectHashMap
* @see IntLongHashMap
* @see LongObjectHashMap
* @see LongLongHashMap
* @see LongIntHashMap
*/
public class /*name*/IntIntHashMap/*name*/ implements Cloneable,
Iterable< /*name*/IntIntHashMap/*name*/.Entry > {
private final float loadFactor;
private Entry[] table;
private int size;
private int mask;
private int capacity;
private int threshold;
private /*value*/int/*value*/ keyNotFoundValue = /*null*/-1/*null*/;
private static final boolean isPrimitive;
private static final Constructor entryConstructor;
private static final Method equalsMethod;
static class EntryCM { EntryCM() { c = null; m1 = null; } Constructor c; Method m1; }
static {
final Class valueClazz = /*value*/int/*value*/.class;
final Class keyClazz = /*key*/int/*key*/.class;
isPrimitive = valueClazz.isPrimitive();
if(!isPrimitive) {
final EntryCM cm = AccessController.doPrivileged(new PrivilegedAction() {
@Override
@SuppressWarnings("unchecked")
public EntryCM run() {
final EntryCM r = new EntryCM();
r.c = (Constructor)
ReflectionUtil.getConstructor(Entry.class,
new Class[] { keyClazz, valueClazz, Entry.class } );
try {
r.m1 = valueClazz.getDeclaredMethod("equals", Object.class);
} catch (final NoSuchMethodException ex) {
throw new JogampRuntimeException("Class "+valueClazz+" doesn't support equals(Object)");
}
return r;
} } );
entryConstructor = cm.c;
equalsMethod = cm.m1;
} else {
entryConstructor = null;
equalsMethod = null;
}
}
public /*name*/IntIntHashMap/*name*/() {
this(16, 0.75f);
}
public /*name*/IntIntHashMap/*name*/(final int initialCapacity) {
this(initialCapacity, 0.75f);
}
public /*name*/IntIntHashMap/*name*/(final int initialCapacity, final 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("loadFactor 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;
}
private /*name*/IntIntHashMap/*name*/(final float loadFactor, final int table_size, final int size,
final int mask, final int capacity, final int threshold,
final /*value*/int/*value*/ keyNotFoundValue) {
this.loadFactor = loadFactor;
this.table = new Entry[table_size];
this.size = size;
this.mask = mask;
this.capacity = capacity;
this.threshold = threshold;
this.keyNotFoundValue = keyNotFoundValue;
}
/**
* Disclaimer: If the value type doesn't implement {@link Object#clone() clone()}, only the reference is copied.
* Note: Due to private fields we cannot implement a copy constructor, sorry.
*
* @param source the primitive hash map to copy
*/
@Override
public Object clone() {
final /*name*/IntIntHashMap/*name*/ n =
new /*name*/IntIntHashMap/*name*/(loadFactor, table.length, size,
mask, capacity, threshold,
keyNotFoundValue);
final ArrayList entries = new ArrayList();
for(int i=table.length-1; i>=0; i--) {
// single linked list -> ArrayList
Entry se = table[i];
while(null != se) {
entries.add(se);
se = se.next;
}
// clone ArrayList -> single linked list (bwd)
final int count = entries.size();
Entry de_next = null;
for(int j=count-1; j>=0; j--) {
se = entries.remove(j);
if( isPrimitive ) {
de_next = new Entry(se.key, se.value, de_next);
} else {
final Object v = ReflectionUtil.callMethod( se.value, getCloneMethod(se.value) );
de_next = (Entry) ReflectionUtil.createInstance(entryConstructor, se.key, v, de_next);
}
}
// 1st elem of linked list is table entry
n.table[i] = de_next;
}
return n;
}
public boolean containsValue(final /*value*/int/*value*/ value) {
final Entry[] t = this.table;
for (int i = t.length; i-- > 0;) {
for (Entry e = t[i]; e != null; e = e.next) {
if( isPrimitive ) {
if (e.value == value) {
return true;
}
} else {
final Boolean b = (Boolean) ReflectionUtil.callMethod(value, equalsMethod, e.value);
if(b.booleanValue()) {
return true;
}
}
}
}
return false;
}
// @SuppressWarnings(value="cast")
public boolean containsKey(final /*key*/int/*key*/ key) {
final Entry[] t = this.table;
final int index = /*keyHash*/key/*keyHash*/ & mask;
for (Entry e = t[index]; e != null; e = e.next) {
if (e.key == key) {
return true;
}
}
return false;
}
/**
* Returns the value to which the specified key is mapped,
* or {@link #getKeyNotFoundValue} if this map contains no mapping for the key.
*/
// @SuppressWarnings(value="cast")
public /*value*/int/*value*/ get(final /*key*/int/*key*/ key) {
final Entry[] t = this.table;
final int index = /*keyHash*/key/*keyHash*/ & mask;
for (Entry e = t[index]; e != null; e = e.next) {
if (e.key == key) {
return e.value;
}
}
return keyNotFoundValue;
}
/**
* Maps the key to the specified value. If a mapping to this key already exists,
* the previous value will be returned (otherwise {@link #getKeyNotFoundValue}).
*/
// @SuppressWarnings(value="cast")
public /*value*/int/*value*/ put(final /*key*/int/*key*/ key, final /*value*/int/*value*/ value) {
final Entry[] t = this.table;
final int index = /*keyHash*/key/*keyHash*/ & mask;
// Check if key already exists.
for (Entry e = t[index]; e != null; e = e.next) {
if (e.key != key) {
continue;
}
final /*value*/int/*value*/ oldValue = e.value;
e.value = value;
return oldValue;
}
t[index] = new Entry(key, value, t[index]);
if (size++ >= threshold) {
// Rehash.
final int newCapacity = 2 * capacity;
final Entry[] newTable = new Entry[newCapacity];
final int newMask = newCapacity - 1;
for (int j = 0; j < t.length; j++) {
Entry e = t[j];
if (e != null) {
t[j] = null;
do {
final Entry next = e.next;
final int index2 = /*keyHash*/e.key/*keyHash*/ & newMask;
e.next = newTable[index2];
newTable[index2] = e;
e = next;
} while (e != null);
}
}
table = newTable;
capacity = newCapacity;
threshold = (int) (newCapacity * loadFactor);
mask = newMask;
}
return keyNotFoundValue;
}
/**
* Copies all of the mappings from the specified map to this map.
*/
public void putAll(final /*name*/IntIntHashMap/*name*/ source) {
final Iterator itr = source.iterator();
while(itr.hasNext()) {
final Entry e = itr.next();
put(e.key, e.value);
}
}
/**
* Removes the key-value mapping from this map.
* Returns the previously mapped value or {@link #getKeyNotFoundValue} if no such mapping exists.
*/
// @SuppressWarnings(value="cast")
public /*value*/int/*value*/ remove(final /*key*/int/*key*/ key) {
final Entry[] t = this.table;
final int index = /*keyHash*/key/*keyHash*/ & mask;
Entry prev = t[index];
Entry e = prev;
while (e != null) {
final Entry next = e.next;
if (e.key == key) {
size--;
if (prev == e) {
t[index] = next;
} else {
prev.next = next;
}
return e.value;
}
prev = e;
e = next;
}
return keyNotFoundValue;
}
/**
* Returns the current number of key-value mappings in this map.
*/
public int size() {
return size;
}
/**
* Returns the current capacity (buckets) in this map.
*/
public int capacity() {
return capacity;
}
/**
* Clears the entire map. The size is 0 after this operation.
*/
public void clear() {
Arrays.fill(table, null);
size = 0;
}
/**
* Returns a new {@link Iterator}.
* Note: this Iterator does not yet support removal of elements.
*/
@Override
public Iterator iterator() {
return new EntryIterator(table);
}
/**
* Sets the new key not found value.
* For primitive types (int, long) the default is -1,
* for Object types, the default is null.
*
* @return the previous key not found value
* @see #get
* @see #put
*/
public /*value*/int/*value*/ setKeyNotFoundValue(final /*value*/int/*value*/ newKeyNotFoundValue) {
final /*value*/int/*value*/ t = keyNotFoundValue;
keyNotFoundValue = newKeyNotFoundValue;
return t;
}
/**
* Returns the value which is returned if no value has been found for the specified key.
* @see #get
* @see #put
*/
public /*value*/int/*value*/ getKeyNotFoundValue() {
return keyNotFoundValue;
}
/**
* @param sb if null, a new StringBuilder is created
* @return StringBuilder instance with appended string information of this Entry
*/
public StringBuilder toString(StringBuilder sb) {
if(null == sb) {
sb = new StringBuilder();
}
sb.append("{");
final Iterator itr = iterator();
while(itr.hasNext()) {
itr.next().toString(sb);
if(itr.hasNext()) {
sb.append(", ");
}
}
sb.append("}");
return sb;
}
@Override
public String toString() {
return toString(null).toString();
}
private final static class EntryIterator implements Iterator {
private final Entry[] entries;
private int index;
private Entry next;
private EntryIterator(final Entry[] entries){
this.entries = entries;
// load next
next();
}
@Override
public boolean hasNext() {
return next != null;
}
@Override
public Entry next() {
final Entry current = next;
if(current != null && current.next != null) {
next = current.next;
}else{
while(index < entries.length) {
final Entry e = entries[index++];
if(e != null) {
next = e;
return current;
}
}
next = null;
}
return current;
}
@Override
public void remove() {
throw new UnsupportedOperationException("Not supported yet.");
}
}
/**
* An entry mapping a key to a value.
*/
public final static class Entry {
public final /*key*/int/*key*/ key;
public /*value*/int/*value*/ value;
Entry next;
Entry(final /*key*/int/*key*/ k, final /*value*/int/*value*/ v, final Entry n) {
key = k;
value = v;
next = n;
}
/**
* Returns the key of this entry.
*/
public /*key*/int/*key*/ getKey() {
return key;
}
/**
* Returns the value of this entry.
*/
public /*value*/int/*value*/ getValue() {
return value;
}
/**
* Sets the value for this entry.
*/
public void setValue(final /*value*/int/*value*/ value) {
this.value = value;
}
/**
* @param sb if null, a new StringBuilder is created
* @return StringBuilder instance with appended string information of this Entry
*/
public StringBuilder toString(StringBuilder sb) {
if(null == sb) {
sb = new StringBuilder();
}
sb.append("[").append(key).append(":").append(value).append("]");
return sb;
}
@Override
public String toString() {
return toString(null).toString();
}
}
private static Method getCloneMethod(final Object obj) {
final Class clazz = obj.getClass();
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Method run() {
try {
return clazz.getDeclaredMethod("clone");
} catch (final NoSuchMethodException ex) {
throw new JogampRuntimeException("Class "+clazz+" doesn't support clone()", ex);
}
} } );
}
}
