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/*
* Copyright 2008 Google Inc.
*
* Licensed 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 java.util;
import com.google.gwt.core.client.JavaScriptObject;
/**
* Implementation of Map interface based on a hash table. [Sun
* docs]
*
* @param key type
* @param value type
*/
abstract class AbstractHashMap extends AbstractMap {
/*
* Implementation notes:
*
* String keys are stored in a separate map from non-String keys. String keys
* are mapped to their values via a JS associative map, stringMap. String keys
* could collide with intrinsic properties (like watch, constructor) so we
* prepend each key with a ':' inside of stringMap.
*
* Integer keys are used to index all non-string keys. A key's hashCode is the
* index in hashCodeMap which should contain that key. Since several keys may
* have the same hash, each value in hashCodeMap is actually an array
* containing all entries whose keys share the same hash.
*/
private final class EntrySet extends AbstractSet> {
@Override
public void clear() {
AbstractHashMap.this.clear();
}
@Override
public boolean contains(Object o) {
if (o instanceof Map.Entry) {
Map.Entry entry = (Map.Entry) o;
Object key = entry.getKey();
if (AbstractHashMap.this.containsKey(key)) {
Object value = AbstractHashMap.this.get(key);
return AbstractHashMap.this.equals(entry.getValue(), value);
}
}
return false;
}
@Override
public Iterator> iterator() {
return new EntrySetIterator();
}
@Override
public boolean remove(Object entry) {
if (contains(entry)) {
Object key = ((Map.Entry) entry).getKey();
AbstractHashMap.this.remove(key);
return true;
}
return false;
}
@Override
public int size() {
return AbstractHashMap.this.size();
}
}
/**
* Iterator for EntrySetImpl.
*/
private final class EntrySetIterator implements Iterator> {
private final Iterator> iter;
private Map.Entry last = null;
/**
* Constructor for EntrySetIterator.
*/
public EntrySetIterator() {
List> list = new ArrayList>();
if (nullSlotLive) {
list.add(new MapEntryNull());
}
addAllStringEntries(list);
addAllHashEntries(list);
this.iter = list.iterator();
}
public boolean hasNext() {
return iter.hasNext();
}
public Map.Entry next() {
return last = iter.next();
}
public void remove() {
if (last == null) {
throw new IllegalStateException("Must call next() before remove().");
} else {
iter.remove();
AbstractHashMap.this.remove(last.getKey());
last = null;
}
}
}
private final class MapEntryNull extends AbstractMapEntry {
public K getKey() {
return null;
}
public V getValue() {
return nullSlot;
}
public V setValue(V object) {
return putNullSlot(object);
}
}
// Instantiated from JSNI
@SuppressWarnings("unused")
private final class MapEntryString extends AbstractMapEntry {
private final String key;
public MapEntryString(String key) {
this.key = key;
}
@SuppressWarnings("unchecked")
public K getKey() {
return (K) key;
}
public V getValue() {
return getStringValue(key);
}
public V setValue(V object) {
return putStringValue(key, object);
}
}
/**
* A map of integral hashCodes onto entries.
*/
// Used from JSNI.
@SuppressWarnings("unused")
private transient JavaScriptObject hashCodeMap;
/**
* This is the slot that holds the value associated with the "null" key.
*/
private transient V nullSlot;
private transient boolean nullSlotLive;
private int size;
/**
* A map of Strings onto values.
*/
// Used from JSNI.
@SuppressWarnings("unused")
private transient JavaScriptObject stringMap;
{
clearImpl();
}
public AbstractHashMap() {
}
public AbstractHashMap(int ignored) {
// This implementation of HashMap has no need of initial capacities.
this(ignored, 0);
}
public AbstractHashMap(int ignored, float alsoIgnored) {
// This implementation of HashMap has no need of load factors or capacities.
if (ignored < 0 || alsoIgnored < 0) {
throw new IllegalArgumentException(
"initial capacity was negative or load factor was non-positive");
}
}
public AbstractHashMap(Map toBeCopied) {
this.putAll(toBeCopied);
}
@Override
public void clear() {
clearImpl();
}
public abstract Object clone();
@Override
public boolean containsKey(Object key) {
return (key == null) ? nullSlotLive : (!(key instanceof String)
? hasHashValue(key, getHashCode(key)) : hasStringValue((String) key));
}
@Override
public boolean containsValue(Object value) {
if (nullSlotLive && equals(nullSlot, value)) {
return true;
} else if (containsStringValue(value)) {
return true;
} else if (containsHashValue(value)) {
return true;
}
return false;
}
@Override
public Set> entrySet() {
return new EntrySet();
}
@Override
public V get(Object key) {
return (key == null) ? nullSlot : (!(key instanceof String) ? getHashValue(
key, getHashCode(key)) : getStringValue((String) key));
}
@Override
public V put(K key, V value) {
return (key == null) ? putNullSlot(value) : (!(key instanceof String)
? putHashValue(key, value, getHashCode(key)) : putStringValue(
(String) key, value));
}
@Override
public V remove(Object key) {
return (key == null) ? removeNullSlot() : (!(key instanceof String)
? removeHashValue(key, getHashCode(key))
: removeStringValue((String) key));
}
@Override
public int size() {
return size;
}
/**
* Subclasses must override to return a whether or not two keys or values are
* equal.
*/
protected abstract boolean equals(Object value1, Object value2);
/**
* Subclasses must override to return a hash code for a given key. The key is
* guaranteed to be non-null and not a String.
*/
protected abstract int getHashCode(Object key);
private native void addAllHashEntries(Collection dest) /*-{
var hashCodeMap = [email protected]::hashCodeMap;
for (var hashCode in hashCodeMap) {
// sanity check that it's really an integer
var hashCodeInt = parseInt(hashCode, 10);
if (hashCode == hashCodeInt) {
var array = hashCodeMap[hashCodeInt];
for (var i = 0, c = array.length; i < c; ++i) {
[email protected]::add(Ljava/lang/Object;)(array[i]);
}
}
}
}-*/;
private native void addAllStringEntries(Collection dest) /*-{
var stringMap = [email protected]::stringMap;
for (var key in stringMap) {
// only keys that start with a colon ':' count
if (key.charCodeAt(0) == 58) {
var entry = @java.util.AbstractHashMap$MapEntryString::new(Ljava/util/AbstractHashMap;Ljava/lang/String;)(this, key.substring(1));
[email protected]::add(Ljava/lang/Object;)(entry);
}
}
}-*/;
private void clearImpl() {
hashCodeMap = JavaScriptObject.createArray();
stringMap = JavaScriptObject.createObject();
nullSlotLive = false;
nullSlot = null;
size = 0;
}
/**
* Returns true if hashCodeMap contains any Map.Entry whose value is Object
* equal to value.
*/
private native boolean containsHashValue(Object value) /*-{
var hashCodeMap = [email protected]::hashCodeMap;
for (var hashCode in hashCodeMap) {
// sanity check that it's really one of ours
var hashCodeInt = parseInt(hashCode, 10);
if (hashCode == hashCodeInt) {
var array = hashCodeMap[hashCodeInt];
for (var i = 0, c = array.length; i < c; ++i) {
var entry = array[i];
var entryValue = [email protected]$Entry::getValue()();
if ([email protected]::equalsBridge(Ljava/lang/Object;Ljava/lang/Object;)(value, entryValue)) {
return true;
}
}
}
}
return false;
}-*/;
/**
* Returns true if stringMap contains any key whose value is Object equal to
* value.
*/
private native boolean containsStringValue(Object value) /*-{
var stringMap = [email protected]::stringMap;
for (var key in stringMap) {
// only keys that start with a colon ':' count
if (key.charCodeAt(0) == 58) {
var entryValue = stringMap[key];
if ([email protected]::equalsBridge(Ljava/lang/Object;Ljava/lang/Object;)(value, entryValue)) {
return true;
}
}
}
return false;
}-*/;
/**
* Bridge method from JSNI that keeps us from having to make polymorphic calls
* in JSNI. By putting the polymorphism in Java code, the compiler can do a
* better job of optimizing in most cases.
*/
@SuppressWarnings("unused")
private boolean equalsBridge(Object value1, Object value2) {
return equals(value1, value2);
}
/**
* Returns the Map.Entry whose key is Object equal to key,
* provided that key's hash code is hashCode;
* or null if no such Map.Entry exists at the specified
* hashCode.
*/
private native V getHashValue(Object key, int hashCode) /*-{
var array = [email protected]::hashCodeMap[hashCode];
if (array) {
for (var i = 0, c = array.length; i < c; ++i) {
var entry = array[i];
var entryKey = [email protected]$Entry::getKey()();
if ([email protected]::equalsBridge(Ljava/lang/Object;Ljava/lang/Object;)(key, entryKey)) {
return [email protected]$Entry::getValue()();
}
}
}
return null;
}-*/;
/**
* Returns the value for the given key in the stringMap. Returns
* null if the specified key does not exist.
*/
private native V getStringValue(String key) /*-{
return [email protected]::stringMap[':' + key];
}-*/;
/**
* Returns true if the a key exists in the hashCodeMap that is Object equal to
* key, provided that key's hash code is
* hashCode.
*/
private native boolean hasHashValue(Object key, int hashCode) /*-{
var array = [email protected]::hashCodeMap[hashCode];
if (array) {
for (var i = 0, c = array.length; i < c; ++i) {
var entry = array[i];
var entryKey = [email protected]$Entry::getKey()();
if ([email protected]::equalsBridge(Ljava/lang/Object;Ljava/lang/Object;)(key, entryKey)) {
return true;
}
}
}
return false;
}-*/;
/**
* Returns true if the given key exists in the stringMap.
*/
private native boolean hasStringValue(String key) /*-{
return (':' + key) in [email protected]::stringMap;
}-*/;
/**
* Sets the specified key to the specified value in the hashCodeMap. Returns
* the value previously at that key. Returns null if the
* specified key did not exist.
*/
private native V putHashValue(K key, V value, int hashCode) /*-{
var array = [email protected]::hashCodeMap[hashCode];
if (array) {
for (var i = 0, c = array.length; i < c; ++i) {
var entry = array[i];
var entryKey = [email protected]$Entry::getKey()();
if ([email protected]::equalsBridge(Ljava/lang/Object;Ljava/lang/Object;)(key, entryKey)) {
// Found an exact match, just update the existing entry
var previous = [email protected]$Entry::getValue()();
[email protected]$Entry::setValue(Ljava/lang/Object;)(value);
return previous;
}
}
} else {
array = [email protected]::hashCodeMap[hashCode] = [];
}
var entry = @java.util.MapEntryImpl::new(Ljava/lang/Object;Ljava/lang/Object;)(key, value);
array.push(entry);
[email protected]::size;
return null;
}-*/;
private V putNullSlot(V value) {
V result = nullSlot;
nullSlot = value;
if (!nullSlotLive) {
nullSlotLive = true;
++size;
}
return result;
}
/**
* Sets the specified key to the specified value in the stringMap. Returns the
* value previously at that key. Returns null if the specified
* key did not exist.
*/
private native V putStringValue(String key, V value) /*-{
var result, stringMap = [email protected]::stringMap;
key = ':' + key;
if (key in stringMap) {
result = stringMap[key];
} else {
[email protected]::size;
}
stringMap[key] = value;
return result;
}-*/;
/**
* Removes the pair whose key is Object equal to key from
* hashCodeMap, provided that key's hash code
* is hashCode. Returns the value that was associated with the
* removed key, or null if no such key existed.
*/
private native V removeHashValue(Object key, int hashCode) /*-{
var array = [email protected]::hashCodeMap[hashCode];
if (array) {
for (var i = 0, c = array.length; i < c; ++i) {
var entry = array[i];
var entryKey = [email protected]$Entry::getKey()();
if ([email protected]::equalsBridge(Ljava/lang/Object;Ljava/lang/Object;)(key, entryKey)) {
if (array.length == 1) {
// remove the whole array
delete [email protected]::hashCodeMap[hashCode];
} else {
// splice out the entry we're removing
array.splice(i, 1);
}
[email protected]::size;
return [email protected]$Entry::getValue()();
}
}
}
return null;
}-*/;
private V removeNullSlot() {
V result = nullSlot;
nullSlot = null;
if (nullSlotLive) {
nullSlotLive = false;
--size;
}
return result;
}
/**
* Removes the specified key from the stringMap and returns the value that was
* previously there. Returns null if the specified key does not
* exist.
*/
private native V removeStringValue(String key) /*-{
var result, stringMap = [email protected]::stringMap;
key = ':' + key;
if (key in stringMap) {
result = stringMap[key];
[email protected]::size;
delete stringMap[key];
}
return result;
}-*/;
}
