diff options
Diffstat (limited to 'jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyValueModelWrapper.java')
-rw-r--r-- | jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyValueModelWrapper.java | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyValueModelWrapper.java b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyValueModelWrapper.java deleted file mode 100644 index c5195af061..0000000000 --- a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyValueModelWrapper.java +++ /dev/null @@ -1,145 +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 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.PropertyChangeEvent; -import org.eclipse.jpt.utility.model.listener.PropertyChangeListener; -import org.eclipse.jpt.utility.model.value.PropertyValueModel; - -/** - * This abstract class provides the infrastructure needed to wrap - * another property value model, "lazily" listen to it, and propagate - * its change notifications. - */ -public abstract class PropertyValueModelWrapper<T> - extends AbstractModel -{ - - /** The wrapped property value model. */ - protected final PropertyValueModel<? extends T> valueHolder; - - /** A listener that allows us to synch with changes to the wrapped value holder. */ - protected final PropertyChangeListener valueChangeListener; - - - // ********** constructors/initialization ********** - - /** - * Construct a property value model with the specified wrapped - * property value model. The value holder is required. - */ - protected PropertyValueModelWrapper(PropertyValueModel<? extends T> valueHolder) { - super(); - if (valueHolder == null) { - throw new NullPointerException(); - } - this.valueHolder = valueHolder; - this.valueChangeListener = this.buildValueChangeListener(); - } - - @Override - protected ChangeSupport buildChangeSupport() { - return new SingleAspectChangeSupport(this, PropertyChangeListener.class, PropertyValueModel.VALUE); - } - - protected PropertyChangeListener buildValueChangeListener() { - return new PropertyChangeListener() { - public void propertyChanged(PropertyChangeEvent event) { - PropertyValueModelWrapper.this.valueChanged(event); - } - @Override - public String toString() { - return "value change listener"; //$NON-NLS-1$ - } - }; - } - - - // ********** extend change support ********** - - /** - * Extend to start listening to the nested model if necessary. - */ - @Override - public synchronized void addPropertyChangeListener(PropertyChangeListener listener) { - if (this.hasNoPropertyChangeListeners(PropertyValueModel.VALUE)) { - this.engageValueHolder(); - } - super.addPropertyChangeListener(listener); - } - - /** - * Extend to start listening to the nested model if necessary. - */ - @Override - public synchronized void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) { - if (propertyName == PropertyValueModel.VALUE && this.hasNoPropertyChangeListeners(PropertyValueModel.VALUE)) { - this.engageValueHolder(); - } - super.addPropertyChangeListener(propertyName, listener); - } - - /** - * Extend to stop listening to the nested model if necessary. - */ - @Override - public synchronized void removePropertyChangeListener(PropertyChangeListener listener) { - super.removePropertyChangeListener(listener); - if (this.hasNoPropertyChangeListeners(PropertyValueModel.VALUE)) { - this.disengageValueHolder(); - } - } - - /** - * Extend to stop listening to the nested model if necessary. - */ - @Override - public synchronized void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) { - super.removePropertyChangeListener(propertyName, listener); - if (propertyName == PropertyValueModel.VALUE && this.hasNoPropertyChangeListeners(PropertyValueModel.VALUE)) { - this.disengageValueHolder(); - } - } - - - // ********** behavior ********** - - /** - * Begin listening to the value holder. - */ - protected void engageValueHolder() { - this.valueHolder.addPropertyChangeListener(PropertyValueModel.VALUE, this.valueChangeListener); - } - - /** - * Stop listening to the value holder. - */ - protected void disengageValueHolder() { - this.valueHolder.removePropertyChangeListener(PropertyValueModel.VALUE, this.valueChangeListener); - } - - @Override - public void toString(StringBuilder sb) { - sb.append(this.valueHolder); - } - - - // ********** property change support ********** - - /** - * The value of the wrapped value holder has changed; - * propagate the change notification appropriately. - */ - protected abstract void valueChanged(PropertyChangeEvent event); - -} |