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/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc. All rights reserved. Use is
* subject to license terms.
*/
package org.jdesktop.observablecollections;
import java.util.AbstractList;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* {@code ObservableCollections} provides factory methods for creating
* observable lists and maps.
*
*
* @author sky
*/
public final class ObservableCollections {
/**
* Creates and returns an {@code ObservableMap} wrapping the supplied
* {@code Map}.
*
* @param map the {@code Map} to wrap
* @return an {@code ObservableMap}
* @throws IllegalArgumentException if {@code map} is {@code null}
*/
public static ObservableMap observableMap(Map map) {
if (map == null) {
throw new IllegalArgumentException("Map must be non-null");
}
return new ObservableMapImpl(map);
}
/**
* Creates and returns an {@code ObservableList} wrapping the supplied
* {@code List}.
*
* @param list the {@code List} to wrap
* @return an {@code ObservableList}
* @throws IllegalArgumentException if {@code list} is {@code null}
*/
public static ObservableList observableList(List list) {
if (list == null) {
throw new IllegalArgumentException("List must be non-null");
}
return new ObservableListImpl(list, false);
}
/**
* Creates and returns an {@code ObservableListHelper} wrapping
* the supplied {@code List}. If you can track changes to the underlying
* list, use this method instead of {@code observableList()}.
*
* @param list the {@code List} to wrap
* @return an {@code ObservableList}
* @throws IllegalArgumentException if {@code list} is {@code null}
*
* @see #observableList
*/
public static ObservableListHelper observableListHelper(List list) {
ObservableListImpl oList = new ObservableListImpl(list, true);
return new ObservableListHelper(oList);
}
/**
* {@code ObservableListHelper} is created by {@code observableListHelper},
* and useful when changes to individual elements of the list can be
* tracked.
*
* @see #observableListHelper
*/
public static final class ObservableListHelper {
private final ObservableListImpl list;
ObservableListHelper(ObservableListImpl list) {
this.list = list;
}
/**
* Returns the {@code ObservableList}.
*
* @return the observable list
*/
public ObservableList getObservableList() {
return list;
}
/**
* Sends notification that the element at the specified index
* has changed.
*
* @param index the index of the element that has changed
* @throws ArrayIndexOutOfBoundsException if index is outside the
* range of the {@code List} ({@code < 0 || >= size})
*/
public void fireElementChanged(int index) {
if (index < 0 || index >= list.size()) {
throw new ArrayIndexOutOfBoundsException("Illegal index");
}
list.fireElementChanged(index);
}
}
private static final class ObservableMapImpl extends AbstractMap
implements ObservableMap {
private Map map;
private List listeners;
private Set> entrySet;
ObservableMapImpl(Map map) {
this.map = map;
listeners = new CopyOnWriteArrayList();
}
public void clear() {
// Remove all elements via iterator to trigger notification
Iterator iterator = keySet().iterator();
while (iterator.hasNext()) {
iterator.next();
iterator.remove();
}
}
public boolean containsKey(Object key) {
return map.containsKey(key);
}
public boolean containsValue(Object value) {
return map.containsValue(value);
}
public Set> entrySet() {
Set> es = entrySet;
return es != null ? es : (entrySet = new EntrySet());
}
public V get(Object key) {
return map.get(key);
}
public boolean isEmpty() {
return map.isEmpty();
}
public V put(K key, V value) {
V lastValue;
if (containsKey(key)) {
lastValue = map.put(key, value);
for (ObservableMapListener listener : listeners) {
listener.mapKeyValueChanged(this, key, lastValue);
}
} else {
lastValue = map.put(key, value);
for (ObservableMapListener listener : listeners) {
listener.mapKeyAdded(this, key);
}
}
return lastValue;
}
public void putAll(Map m) {
for (K key : m.keySet()) {
put(key, m.get(key));
}
}
public V remove(Object key) {
if (containsKey(key)) {
V value = map.remove(key);
for (ObservableMapListener listener : listeners) {
listener.mapKeyRemoved(this, key, value);
}
return value;
}
return null;
}
public int size() {
return map.size();
}
public void addObservableMapListener(ObservableMapListener listener) {
listeners.add(listener);
}
public void removeObservableMapListener(ObservableMapListener listener) {
listeners.remove(listener);
}
private class EntryIterator implements Iterator> {
private Iterator> realIterator;
private Map.Entry last;
EntryIterator() {
realIterator = map.entrySet().iterator();
}
public boolean hasNext() {
return realIterator.hasNext();
}
public Map.Entry next() {
last = realIterator.next();
return last;
}
public void remove() {
if (last == null) {
throw new IllegalStateException();
}
Object toRemove = last.getKey();
last = null;
ObservableMapImpl.this.remove(toRemove);
}
}
private class EntrySet extends AbstractSet> {
public Iterator> iterator() {
return new EntryIterator();
}
@SuppressWarnings("unchecked")
public boolean contains(Object o) {
if (!(o instanceof Map.Entry)) {
return false;
}
Map.Entry e = (Map.Entry)o;
return containsKey(e.getKey());
}
@SuppressWarnings("unchecked")
public boolean remove(Object o) {
if (o instanceof Map.Entry) {
K key = ((Map.Entry)o).getKey();
if (containsKey(key)) {
remove(key);
return true;
}
}
return false;
}
public int size() {
return ObservableMapImpl.this.size();
}
public void clear() {
ObservableMapImpl.this.clear();
}
}
}
private static final class ObservableListImpl extends AbstractList
implements ObservableList {
private final boolean supportsElementPropertyChanged;
private List list;
private List listeners;
ObservableListImpl(List list, boolean supportsElementPropertyChanged) {
this.list = list;
listeners = new CopyOnWriteArrayList();
this.supportsElementPropertyChanged = supportsElementPropertyChanged;
}
public E get(int index) {
return list.get(index);
}
public int size() {
return list.size();
}
public E set(int index, E element) {
E oldValue = list.set(index, element);
for (ObservableListListener listener : listeners) {
listener.listElementReplaced(this, index, oldValue);
}
return oldValue;
}
public void add(int index, E element) {
list.add(index, element);
modCount++;
for (ObservableListListener listener : listeners) {
listener.listElementsAdded(this, index, 1);
}
}
public E remove(int index) {
E oldValue = list.remove(index);
modCount++;
for (ObservableListListener listener : listeners) {
listener.listElementsRemoved(this, index,
java.util.Collections.singletonList(oldValue));
}
return oldValue;
}
public boolean addAll(Collection c) {
return addAll(size(), c);
}
public boolean addAll(int index, Collection c) {
if (list.addAll(index, c)) {
modCount++;
for (ObservableListListener listener : listeners) {
listener.listElementsAdded(this, index, c.size());
}
}
return false;
}
public void clear() {
List dup = new ArrayList(list);
list.clear();
modCount++;
if (dup.size() != 0) {
for (ObservableListListener listener : listeners) {
listener.listElementsRemoved(this, 0, dup);
}
}
}
public boolean containsAll(Collection c) {
return list.containsAll(c);
}
public T[] toArray(T[] a) {
return list.toArray(a);
}
public Object[] toArray() {
return list.toArray();
}
private void fireElementChanged(int index) {
for (ObservableListListener listener : listeners) {
listener.listElementPropertyChanged(this, index);
}
}
public void addObservableListListener(ObservableListListener listener) {
listeners.add(listener);
}
public void removeObservableListListener(ObservableListListener listener) {
listeners.remove(listener);
}
public boolean supportsElementPropertyChanged() {
return supportsElementPropertyChanged;
}
}
}
