diff options
Diffstat (limited to 'jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/CollectionValueModelWrapper.java')
| -rw-r--r-- | jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/CollectionValueModelWrapper.java | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/CollectionValueModelWrapper.java b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/CollectionValueModelWrapper.java deleted file mode 100644 index 4190fe1d41..0000000000 --- a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/CollectionValueModelWrapper.java +++ /dev/null @@ -1,179 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2007, 2008 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.utility.internal.model.value; - -import java.util.Iterator; -import org.eclipse.jpt.utility.internal.model.AbstractModel; -import org.eclipse.jpt.utility.internal.model.ChangeSupport; -import org.eclipse.jpt.utility.internal.model.SingleAspectChangeSupport; -import org.eclipse.jpt.utility.model.event.CollectionChangeEvent; -import org.eclipse.jpt.utility.model.listener.CollectionChangeListener; -import org.eclipse.jpt.utility.model.value.CollectionValueModel; - -/** - * This abstract class provides the infrastructure needed to wrap - * another collection value model, "lazily" listen to it, and propagate - * its change notifications. - */ -public abstract class CollectionValueModelWrapper<E> - extends AbstractModel -{ - - /** The wrapped collection value model. */ - protected final CollectionValueModel<? extends E> collectionHolder; - - /** A listener that allows us to synch with changes to the wrapped collection holder. */ - protected final CollectionChangeListener collectionChangeListener; - - - // ********** constructors ********** - - /** - * Construct a collection value model with the specified wrapped - * collection value model. - */ - protected CollectionValueModelWrapper(CollectionValueModel<? extends E> collectionHolder) { - super(); - this.collectionHolder = collectionHolder; - this.collectionChangeListener = this.buildCollectionChangeListener(); - } - - - // ********** initialization ********** - - @Override - protected ChangeSupport buildChangeSupport() { - return new SingleAspectChangeSupport(this, CollectionChangeListener.class, CollectionValueModel.VALUES); - } - - protected CollectionChangeListener buildCollectionChangeListener() { - return new CollectionChangeListener() { - public void itemsAdded(CollectionChangeEvent event) { - CollectionValueModelWrapper.this.itemsAdded(event); - } - public void itemsRemoved(CollectionChangeEvent event) { - CollectionValueModelWrapper.this.itemsRemoved(event); - } - public void collectionCleared(CollectionChangeEvent event) { - CollectionValueModelWrapper.this.collectionCleared(event); - } - public void collectionChanged(CollectionChangeEvent event) { - CollectionValueModelWrapper.this.collectionChanged(event); - } - @Override - public String toString() { - return "collection change listener"; - } - }; - } - - - // ********** extend change support ********** - - /** - * Extend to start listening to the nested model if necessary. - */ - @Override - public synchronized void addCollectionChangeListener(CollectionChangeListener listener) { - if (this.hasNoCollectionChangeListeners(CollectionValueModel.VALUES)) { - this.engageModel(); - } - super.addCollectionChangeListener(listener); - } - - /** - * Extend to start listening to the nested model if necessary. - */ - @Override - public synchronized void addCollectionChangeListener(String collectionName, CollectionChangeListener listener) { - if (collectionName == CollectionValueModel.VALUES && this.hasNoCollectionChangeListeners(CollectionValueModel.VALUES)) { - this.engageModel(); - } - super.addCollectionChangeListener(collectionName, listener); - } - - /** - * Extend to stop listening to the nested model if necessary. - */ - @Override - public synchronized void removeCollectionChangeListener(CollectionChangeListener listener) { - super.removeCollectionChangeListener(listener); - if (this.hasNoCollectionChangeListeners(CollectionValueModel.VALUES)) { - this.disengageModel(); - } - } - - /** - * Extend to stop listening to the nested model if necessary. - */ - @Override - public synchronized void removeCollectionChangeListener(String collectionName, CollectionChangeListener listener) { - super.removeCollectionChangeListener(collectionName, listener); - if (collectionName == CollectionValueModel.VALUES && this.hasNoCollectionChangeListeners(CollectionValueModel.VALUES)) { - this.disengageModel(); - } - } - - - // ********** behavior ********** - - /** - * Start listening to the collection holder. - */ - protected void engageModel() { - this.collectionHolder.addCollectionChangeListener(CollectionValueModel.VALUES, this.collectionChangeListener); - } - - /** - * Stop listening to the collection holder. - */ - protected void disengageModel() { - this.collectionHolder.removeCollectionChangeListener(CollectionValueModel.VALUES, this.collectionChangeListener); - } - - // minimize scope of suppressed warnings - @SuppressWarnings("unchecked") - protected Iterator<E> items(CollectionChangeEvent event) { - return (Iterator<E>) event.items(); - } - - @Override - public void toString(StringBuilder sb) { - sb.append(this.collectionHolder); - } - - - // ********** collection change support ********** - - /** - * Items were added to the wrapped collection holder; - * propagate the change notification appropriately. - */ - protected abstract void itemsAdded(CollectionChangeEvent event); - - /** - * Items were removed from the wrapped collection holder; - * propagate the change notification appropriately. - */ - protected abstract void itemsRemoved(CollectionChangeEvent event); - - /** - * The wrapped collection holder was cleared; - * propagate the change notification appropriately. - */ - protected abstract void collectionCleared(CollectionChangeEvent event); - - /** - * The value of the wrapped collection holder has changed; - * propagate the change notification appropriately. - */ - protected abstract void collectionChanged(CollectionChangeEvent event); - -} |