diff options
Diffstat (limited to 'jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/AbstractPropertyValueModel.java')
-rw-r--r-- | jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/AbstractPropertyValueModel.java | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/AbstractPropertyValueModel.java b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/AbstractPropertyValueModel.java deleted file mode 100644 index d85efef68a..0000000000 --- a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/AbstractPropertyValueModel.java +++ /dev/null @@ -1,124 +0,0 @@ -/******************************************************************************* - * Copyright (c) 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.utility.internal.model.value; - -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.listener.ChangeListener; -import org.eclipse.jpt.utility.model.listener.PropertyChangeListener; -import org.eclipse.jpt.utility.model.value.PropertyValueModel; - -/** - * This abstract class provides the infrastructure for "lazily" adding listeners - * to an underlying model as necessary. Subclasses will need to engage and - * disegage the underlying model and fire the appropriate property change - * events. Subclasses must implement the appropriate {@link PropertyValueModel}. - * <p> - * Subclasses must implement the following methods:<ul> - * <li>{@link #engageModel()}<p> - * implement this method to add the appropriate listener to the underlying model - * <li>{@link #disengageModel()}<p> - * implement this method to remove the appropriate listener from the underlying model - * </ul> - */ -public abstract class AbstractPropertyValueModel - extends AbstractModel -{ - - // ********** constructor/initialization ********** - - protected AbstractPropertyValueModel() { - super(); - } - - @Override - protected ChangeSupport buildChangeSupport() { - return new SingleAspectChangeSupport(this, PropertyChangeListener.class, PropertyValueModel.VALUE); - } - - - // ********** extend change support ********** - - /** - * Extend to start listening to the underlying model if necessary. - */ - @Override - public synchronized void addChangeListener(ChangeListener listener) { - if (this.hasNoListeners()) { - this.engageModel(); - } - super.addChangeListener(listener); - } - - /** - * Extend to stop listening to the underlying model if necessary. - */ - @Override - public synchronized void removeChangeListener(ChangeListener listener) { - super.removeChangeListener(listener); - if (this.hasNoListeners()) { - this.disengageModel(); - } - } - - /** - * Extend to start listening to the underlying model if necessary. - */ - @Override - public synchronized void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) { - if (propertyName.equals(PropertyValueModel.VALUE) && this.hasNoListeners()) { - this.engageModel(); - } - super.addPropertyChangeListener(propertyName, listener); - } - - /** - * Extend to stop listening to the underlying model if necessary. - */ - @Override - public synchronized void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) { - super.removePropertyChangeListener(propertyName, listener); - if (propertyName.equals(PropertyValueModel.VALUE) && this.hasNoListeners()) { - this.disengageModel(); - } - } - - - // ********** queries ********** - - /** - * Return whether the model has no property value listeners. - */ - protected boolean hasNoListeners() { - return ! this.hasListeners(); - } - - /** - * Return whether the model has any property value listeners. - */ - protected boolean hasListeners() { - return this.hasAnyPropertyChangeListeners(PropertyValueModel.VALUE); - } - - - // ********** behavior ********** - - /** - * Engage the underlying model. - */ - protected abstract void engageModel(); - - /** - * Stop listening to the underlying model. - */ - protected abstract void disengageModel(); - -} |