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/*******************************************************************************
* Copyright (c) 2008, 2009 Matthew Hall and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Matthew Hall - initial API and implementation (bug 194734)
* Matthew Hall - bug 262269
******************************************************************************/
package org.eclipse.core.internal.databinding.property.value;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.IStaleListener;
import org.eclipse.core.databinding.observable.ObservableTracker;
import org.eclipse.core.databinding.observable.StaleEvent;
import org.eclipse.core.databinding.observable.list.AbstractObservableList;
import org.eclipse.core.databinding.observable.list.IListChangeListener;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.list.ListChangeEvent;
import org.eclipse.core.databinding.observable.list.ListDiff;
import org.eclipse.core.databinding.observable.list.ListDiffEntry;
import org.eclipse.core.databinding.property.IProperty;
import org.eclipse.core.databinding.property.IPropertyObservable;
import org.eclipse.core.databinding.property.value.DelegatingValueProperty;
/**
* @since 1.2
*/
public class ListDelegatingValueObservableList extends AbstractObservableList
implements IPropertyObservable {
private IObservableList masterList;
private DelegatingValueProperty detailProperty;
private DelegatingCache cache;
private IListChangeListener masterListener = new IListChangeListener() {
public void handleListChange(ListChangeEvent event) {
if (isDisposed())
return;
cache.addAll(masterList);
// Need both obsolete and new elements to convert diff
ListDiff diff = convertDiff(event.diff);
cache.retainAll(masterList);
fireListChange(diff);
}
private ListDiff convertDiff(ListDiff diff) {
// Convert diff to detail value
ListDiffEntry[] masterEntries = diff.getDifferences();
ListDiffEntry[] detailEntries = new ListDiffEntry[masterEntries.length];
for (int i = 0; i < masterEntries.length; i++) {
ListDiffEntry masterDifference = masterEntries[i];
int index = masterDifference.getPosition();
boolean addition = masterDifference.isAddition();
Object masterElement = masterDifference.getElement();
Object detailValue = cache.get(masterElement);
detailEntries[i] = Diffs.createListDiffEntry(index, addition,
detailValue);
}
return Diffs.createListDiff(detailEntries);
}
};
private IStaleListener staleListener = new IStaleListener() {
public void handleStale(StaleEvent staleEvent) {
fireStale();
}
};
/**
* @param masterList
* @param valueProperty
*/
public ListDelegatingValueObservableList(IObservableList masterList,
DelegatingValueProperty valueProperty) {
super(masterList.getRealm());
this.masterList = masterList;
this.detailProperty = valueProperty;
this.cache = new DelegatingCache(getRealm(), valueProperty) {
void handleValueChange(Object masterElement, Object oldValue,
Object newValue) {
fireListChange(indicesOf(masterElement), oldValue, newValue);
}
};
cache.addAll(masterList);
masterList.addListChangeListener(masterListener);
masterList.addStaleListener(staleListener);
}
protected int doGetSize() {
getterCalled();
return masterList.size();
}
private void getterCalled() {
ObservableTracker.getterCalled(this);
}
public Object get(int index) {
getterCalled();
Object masterElement = masterList.get(index);
return cache.get(masterElement);
}
public boolean add(Object o) {
throw new UnsupportedOperationException();
}
public boolean addAll(Collection c) {
throw new UnsupportedOperationException();
}
public boolean addAll(int index, Collection c) {
throw new UnsupportedOperationException();
}
public boolean contains(Object o) {
getterCalled();
return cache.containsValue(o);
}
public boolean isEmpty() {
getterCalled();
return masterList.isEmpty();
}
public boolean isStale() {
getterCalled();
return masterList.isStale();
}
public Iterator iterator() {
getterCalled();
return new Iterator() {
Iterator it = masterList.iterator();
public boolean hasNext() {
getterCalled();
return it.hasNext();
}
public Object next() {
getterCalled();
Object masterElement = it.next();
return cache.get(masterElement);
}
public void remove() {
throw new UnsupportedOperationException();
}
};
}
public Object move(int oldIndex, int newIndex) {
throw new UnsupportedOperationException();
}
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
public boolean removeAll(Collection c) {
throw new UnsupportedOperationException();
}
public boolean retainAll(Collection c) {
throw new UnsupportedOperationException();
}
public Object[] toArray() {
getterCalled();
Object[] masterElements = masterList.toArray();
Object[] result = new Object[masterElements.length];
for (int i = 0; i < result.length; i++) {
result[i] = cache.get(masterElements[i]);
}
return result;
}
public Object[] toArray(Object[] a) {
getterCalled();
Object[] masterElements = masterList.toArray();
if (a.length < masterElements.length)
a = (Object[]) Array.newInstance(a.getClass().getComponentType(),
masterElements.length);
for (int i = 0; i < masterElements.length; i++) {
a[i] = cache.get(masterElements[i]);
}
return a;
}
public void add(int index, Object o) {
throw new UnsupportedOperationException();
}
public void clear() {
throw new UnsupportedOperationException();
}
public ListIterator listIterator() {
return listIterator(0);
}
public ListIterator listIterator(final int index) {
getterCalled();
return new ListIterator() {
ListIterator it = masterList.listIterator(index);
Object lastMasterElement;
Object lastElement;
boolean haveIterated = false;
public void add(Object arg0) {
throw new UnsupportedOperationException();
}
public boolean hasNext() {
getterCalled();
return it.hasNext();
}
public boolean hasPrevious() {
getterCalled();
return it.hasPrevious();
}
public Object next() {
getterCalled();
lastMasterElement = it.next();
lastElement = cache.get(lastMasterElement);
haveIterated = true;
return lastElement;
}
public int nextIndex() {
getterCalled();
return it.nextIndex();
}
public Object previous() {
getterCalled();
lastMasterElement = it.previous();
lastElement = cache.get(lastMasterElement);
haveIterated = true;
return lastElement;
}
public int previousIndex() {
getterCalled();
return it.previousIndex();
}
public void remove() {
throw new UnsupportedOperationException();
}
public void set(Object o) {
checkRealm();
if (!haveIterated)
throw new IllegalStateException();
cache.put(lastMasterElement, o);
lastElement = o;
}
};
}
private int[] indicesOf(Object masterElement) {
List indices = new ArrayList();
for (ListIterator it = masterList.listIterator(); it.hasNext();) {
if (masterElement == it.next())
indices.add(new Integer(it.previousIndex()));
}
int[] result = new int[indices.size()];
for (int i = 0; i < result.length; i++) {
result[i] = ((Integer) indices.get(i)).intValue();
}
return result;
}
private void fireListChange(int[] indices, Object oldValue, Object newValue) {
ListDiffEntry[] differences = new ListDiffEntry[indices.length * 2];
for (int i = 0; i < indices.length; i++) {
int index = indices[i];
differences[i * 2] = Diffs.createListDiffEntry(index, false,
oldValue);
differences[i * 2 + 1] = Diffs.createListDiffEntry(index, true,
newValue);
}
fireListChange(Diffs.createListDiff(differences));
}
public Object remove(int index) {
throw new UnsupportedOperationException();
}
public Object set(int index, Object o) {
checkRealm();
Object masterElement = masterList.get(index);
return cache.put(masterElement, o);
}
public Object getObserved() {
return masterList;
}
public IProperty getProperty() {
return detailProperty;
}
public Object getElementType() {
return detailProperty.getValueType();
}
public synchronized void dispose() {
if (masterList != null) {
masterList.removeListChangeListener(masterListener);
masterList.removeStaleListener(staleListener);
masterList = null;
}
if (cache != null) {
cache.dispose();
cache = null;
}
masterListener = null;
detailProperty = null;
super.dispose();
}
}

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