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/*******************************************************************************
* Copyright (c) 2007, 2009 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.model.value;
import java.util.Arrays;
import java.util.Collection;
import org.eclipse.jpt.common.utility.model.Model;
import org.eclipse.jpt.common.utility.model.event.ListAddEvent;
import org.eclipse.jpt.common.utility.model.event.ListChangeEvent;
import org.eclipse.jpt.common.utility.model.event.ListClearEvent;
import org.eclipse.jpt.common.utility.model.event.ListMoveEvent;
import org.eclipse.jpt.common.utility.model.event.ListRemoveEvent;
import org.eclipse.jpt.common.utility.model.event.ListReplaceEvent;
import org.eclipse.jpt.common.utility.model.listener.ListChangeListener;
import org.eclipse.jpt.common.utility.model.value.PropertyValueModel;
/**
* This extension of {@link AspectListValueModelAdapter} provides
* basic list change support.
* This converts a set of one or more lists into
* a single {@link #LIST_VALUES} list.
* <p>
* The typical subclass will override the following methods (see the descriptions
* in {@link AspectListValueModelAdapter}):<ul>
* <li>{@link #listIterator_()}
* <li>{@link #get(int)}
* <li>{@link #size_()}
* <li>{@link #toArray_()}
* <li>{@link #listIterator()}
* <li>{@link #size()}
* <li>{@link #toArray()}
* </ul>
*/
public abstract class ListAspectAdapter<S extends Model, E>
extends AspectListValueModelAdapter<S, E>
{
/**
* The name of the subject's lists that we use for the value.
*/
protected final String[] listNames;
protected static final String[] EMPTY_LIST_NAMES = new String[0];
/** A listener that listens to the subject's list aspects. */
protected final ListChangeListener listChangeListener;
// ********** constructors **********
/**
* Construct a list aspect adapter for the specified subject
* and list.
*/
protected ListAspectAdapter(String listName, S subject) {
this(new String[] {listName}, subject);
}
/**
* Construct a list aspect adapter for the specified subject
* and lists.
*/
protected ListAspectAdapter(String[] listNames, S subject) {
this(new StaticPropertyValueModel<S>(subject), listNames);
}
/**
* Construct a list aspect adapter for the specified subject holder
* and lists.
*/
protected ListAspectAdapter(PropertyValueModel<? extends S> subjectHolder, String... listNames) {
super(subjectHolder);
this.listNames = listNames;
this.listChangeListener = this.buildListChangeListener();
}
/**
* Construct a list aspect adapter for the specified subject holder
* and lists.
*/
protected ListAspectAdapter(PropertyValueModel<? extends S> subjectHolder, Collection<String> listNames) {
this(subjectHolder, listNames.toArray(new String[listNames.size()]));
}
/**
* Construct a list aspect adapter for an "unchanging" list in
* the specified subject. This is useful for a list aspect that does not
* change for a particular subject; but the subject will change, resulting in
* a new list.
*/
protected ListAspectAdapter(PropertyValueModel<? extends S> subjectHolder) {
this(subjectHolder, EMPTY_LIST_NAMES);
}
// ********** initialization **********
protected ListChangeListener buildListChangeListener() {
// transform the subject's list change events into VALUE list change events
return new ListChangeListener() {
public void itemsAdded(ListAddEvent event) {
ListAspectAdapter.this.itemsAdded(event);
}
public void itemsRemoved(ListRemoveEvent event) {
ListAspectAdapter.this.itemsRemoved(event);
}
public void itemsReplaced(ListReplaceEvent event) {
ListAspectAdapter.this.itemsReplaced(event);
}
public void itemsMoved(ListMoveEvent event) {
ListAspectAdapter.this.itemsMoved(event);
}
public void listCleared(ListClearEvent event) {
ListAspectAdapter.this.listCleared(event);
}
public void listChanged(ListChangeEvent event) {
ListAspectAdapter.this.listChanged(event);
}
@Override
public String toString() {
return "list change listener: " + Arrays.asList(ListAspectAdapter.this.listNames); //$NON-NLS-1$
}
};
}
// ********** AspectAdapter implementation **********
@Override
protected void engageSubject_() {
for (String listName : this.listNames) {
((Model) this.subject).addListChangeListener(listName, this.listChangeListener);
}
}
@Override
protected void disengageSubject_() {
for (String listName : this.listNames) {
((Model) this.subject).removeListChangeListener(listName, this.listChangeListener);
}
}
// ********** behavior **********
protected void itemsAdded(ListAddEvent event) {
this.fireItemsAdded(event.clone(this, LIST_VALUES));
}
protected void itemsRemoved(ListRemoveEvent event) {
this.fireItemsRemoved(event.clone(this, LIST_VALUES));
}
protected void itemsReplaced(ListReplaceEvent event) {
this.fireItemsReplaced(event.clone(this, LIST_VALUES));
}
protected void itemsMoved(ListMoveEvent event) {
this.fireItemsMoved(event.clone(this, LIST_VALUES));
}
protected void listCleared(ListClearEvent event) {
this.fireListCleared(event.clone(this, LIST_VALUES));
}
protected void listChanged(ListChangeEvent event) {
this.fireListChanged(event.clone(this, LIST_VALUES));
}
}
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