/*******************************************************************************
* Copyright (c) 2006, 2015 IBM Corporation 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:
* IBM Corporation - initial API and implementation
* Brad Reynolds - bugs 164653, 167204
* Matthew Hall - bugs 118516, 208858, 208332, 247367, 146397, 249526,
* 349038
* Stefan Xenos <sxenos@gmail.com> - Bug 335792
* Stefan Xenos <sxenos@gmail.com> - Bug 474065
*******************************************************************************/
package org.eclipse.core.databinding.observable.list;
import java.util.AbstractList;
import java.util.Collection;
import java.util.Iterator;
import org.eclipse.core.databinding.observable.ChangeEvent;
import org.eclipse.core.databinding.observable.ChangeSupport;
import org.eclipse.core.databinding.observable.DisposeEvent;
import org.eclipse.core.databinding.observable.IChangeListener;
import org.eclipse.core.databinding.observable.IDisposeListener;
import org.eclipse.core.databinding.observable.IStaleListener;
import org.eclipse.core.databinding.observable.ObservableTracker;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.StaleEvent;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.AssertionFailedException;
/**
* Subclasses should override at least get(int index) and size().
*
* <p>
* This class is thread safe. All state accessing methods must be invoked from
* the {@link Realm#isCurrent() current realm}. Methods for adding and removing
* listeners may be invoked from any thread.
* </p>
*
* @param <E>
* the list element type
*
* @since 1.0
*
*/
public abstract class AbstractObservableList<E> extends AbstractList<E>
implements IObservableList<E> {
private final class PrivateChangeSupport extends ChangeSupport {
private PrivateChangeSupport(Realm realm) {
super(realm);
}
@Override
protected void firstListenerAdded() {
AbstractObservableList.this.firstListenerAdded();
}
@Override
protected void lastListenerRemoved() {
AbstractObservableList.this.lastListenerRemoved();
}
@Override
protected boolean hasListeners() {
return super.hasListeners();
}
}
private final Realm realm;
private PrivateChangeSupport changeSupport;
private volatile boolean disposed = false;
/**
* @param realm
*
*/
public AbstractObservableList(Realm realm) {
Assert.isNotNull(realm, "Realm cannot be null"); //$NON-NLS-1$
ObservableTracker.observableCreated(this);
this.realm = realm;
changeSupport = new PrivateChangeSupport(realm);
}
/**
*
*/
public AbstractObservableList() {
this(Realm.getDefault());
}
/**
* Returns whether this observable list has any registered listeners.
*
* @return whether this observable list has any registered listeners.
* @since 1.2
*/
protected synchronized boolean hasListeners() {
return !disposed && changeSupport.hasListeners();
}
@Override
public boolean isStale() {
getterCalled();
return false;
}
@Override
public synchronized void addListChangeListener(IListChangeListener<? super E> listener) {
if (!disposed) {
changeSupport.addListener(ListChangeEvent.TYPE, listener);
}
}
@Override
public synchronized void removeListChangeListener(IListChangeListener<? super E> listener) {
if (!disposed) {
changeSupport.removeListener(ListChangeEvent.TYPE, listener);
}
}
protected void fireListChange(ListDiff<E> diff) {
// fire general change event first
fireChange();
changeSupport.fireEvent(new ListChangeEvent<E>(this, diff));
}
@Override
public synchronized void addChangeListener(IChangeListener listener) {
if (!disposed) {
changeSupport.addChangeListener(listener);
}
}
@Override
public synchronized void removeChangeListener(IChangeListener listener) {
if (!disposed) {
changeSupport.removeChangeListener(listener);
}
}
@Override
public synchronized void addStaleListener(IStaleListener listener) {
if (!disposed) {
changeSupport.addStaleListener(listener);
}
}
@Override
public synchronized void removeStaleListener(IStaleListener listener) {
if (!disposed) {
changeSupport.removeStaleListener(listener);
}
}
/**
* @since 1.2
*/
@Override
public synchronized void addDisposeListener(IDisposeListener listener) {
if (!disposed) {
changeSupport.addDisposeListener(listener);
}
}
/**
* @since 1.2
*/
@Override
public synchronized void removeDisposeListener(IDisposeListener listener) {
if (!disposed) {
changeSupport.removeDisposeListener(listener);
}
}
/**
* Fires change event. Must be invoked from the current realm.
*/
protected void fireChange() {
checkRealm();
changeSupport.fireEvent(new ChangeEvent(this));
}
/**
* Fires stale event. Must be invoked from the current realm.
*/
protected void fireStale() {
checkRealm();
changeSupport.fireEvent(new StaleEvent(this));
}
/**
*
*/
protected void firstListenerAdded() {
}
/**
*
*/
protected void lastListenerRemoved() {
}
/**
* @since 1.2
*/
@Override
public synchronized boolean isDisposed() {
return disposed;
}
/**
*
*/
@Override
public synchronized void dispose() {
if (!disposed) {
disposed = true;
changeSupport.fireEvent(new DisposeEvent(this));
changeSupport.dispose();
changeSupport = null;
lastListenerRemoved();
}
}
@Override
public final int size() {
getterCalled();
return doGetSize();
}
/**
* @return the size
*/
protected abstract int doGetSize();
/**
*
*/
private void getterCalled() {
ObservableTracker.getterCalled(this);
}
@Override
public boolean isEmpty() {
getterCalled();
return super.isEmpty();
}
@Override
public boolean contains(Object o) {
getterCalled();
return super.contains(o);
}
@Override
public Iterator<E> iterator() {
getterCalled();
final Iterator<E> wrappedIterator = super.iterator();
return new Iterator<E>() {
@Override
public void remove() {
wrappedIterator.remove();
}
@Override
public boolean hasNext() {
return wrappedIterator.hasNext();
}
@Override
public E next() {
return wrappedIterator.next();
}
};
}
@Override
public Object[] toArray() {
getterCalled();
return super.toArray();
}
@Override
public <T> T[] toArray(T a[]) {
getterCalled();
return super.toArray(a);
}
// Modification Operations
@Override
public boolean add(E o) {
getterCalled();
return super.add(o);
}
/**
* Moves the element located at <code>oldIndex</code> to
* <code>newIndex</code>. This method is equivalent to calling
* <code>add(newIndex, remove(oldIndex))</code>.
* <p>
* Subclasses should override this method to deliver list change
* notification for the remove and add operations in the same
* ListChangeEvent, as this allows {@link ListDiff#accept(ListDiffVisitor)}
* to recognize the operation as a move.
*
* @param oldIndex
* the element's position before the move. Must be within the
* range <code>0 <= oldIndex < size()</code>.
* @param newIndex
* the element's position after the move. Must be within the
* range <code>0 <= newIndex < size()</code>.
* @return the element that was moved.
* @throws IndexOutOfBoundsException
* if either argument is out of range (
* <code>0 <= index < size()</code>).
* @see ListDiffVisitor#handleMove(int, int, Object)
* @see ListDiff#accept(ListDiffVisitor)
* @since 1.1
*/
@Override
public E move(int oldIndex, int newIndex) {
checkRealm();
int size = doGetSize();
if (oldIndex < 0 || oldIndex >= size)
throw new IndexOutOfBoundsException(
"oldIndex: " + oldIndex + ", size:" + size); //$NON-NLS-1$ //$NON-NLS-2$
if (newIndex < 0 || newIndex >= size)
throw new IndexOutOfBoundsException(
"newIndex: " + newIndex + ", size:" + size); //$NON-NLS-1$ //$NON-NLS-2$
E element = remove(oldIndex);
add(newIndex, element);
return element;
}
@Override
public boolean remove(Object o) {
getterCalled();
return super.remove(o);
}
// Bulk Modification Operations
@Override
public boolean containsAll(Collection<?> c) {
getterCalled();
return super.containsAll(c);
}
@Override
public boolean addAll(Collection<? extends E> c) {
getterCalled();
return super.addAll(c);
}
@Override
public boolean addAll(int index, Collection<? extends E> c) {
getterCalled();
return super.addAll(c);
}
@Override
public boolean removeAll(Collection<?> c) {
getterCalled();
return super.removeAll(c);
}
@Override
public boolean retainAll(Collection<?> c) {
getterCalled();
return super.retainAll(c);
}
// Comparison and hashing
@Override
public boolean equals(Object o) {
getterCalled();
return super.equals(o);
}
@Override
public int hashCode() {
getterCalled();
return super.hashCode();
}
@Override
public int indexOf(Object o) {
getterCalled();
return super.indexOf(o);
}
@Override
public int lastIndexOf(Object o) {
getterCalled();
return super.lastIndexOf(o);
}
@Override
public Realm getRealm() {
return realm;
}
/**
* Asserts that the realm is the current realm.
*
* @see Realm#isCurrent()
* @throws AssertionFailedException
* if the realm is not the current realm
*/
protected void checkRealm() {
Assert.isTrue(getRealm().isCurrent(),
"This operation must be run within the observable's realm"); //$NON-NLS-1$
}
}