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Diffstat (limited to 'jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyListValueModelAdapter.java')
-rw-r--r--jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyListValueModelAdapter.java220
1 files changed, 0 insertions, 220 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyListValueModelAdapter.java b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyListValueModelAdapter.java
deleted file mode 100644
index 6826af4511..0000000000
--- a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/model/value/PropertyListValueModelAdapter.java
+++ /dev/null
@@ -1,220 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 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 java.util.ListIterator;
-
-import org.eclipse.jpt.utility.internal.iterators.EmptyListIterator;
-import org.eclipse.jpt.utility.internal.iterators.SingleElementListIterator;
-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.ListChangeListener;
-import org.eclipse.jpt.utility.model.listener.PropertyChangeListener;
-import org.eclipse.jpt.utility.model.value.ListValueModel;
-import org.eclipse.jpt.utility.model.value.PropertyValueModel;
-
-/**
- * An adapter that allows us to make a PropertyValueModel behave like
- * a read-only, single-element ListValueModel, sorta.
- *
- * If the property's value is null, an empty iterator is returned
- * (i.e. you can't have a list with a null element).
- */
-public class PropertyListValueModelAdapter<E>
- extends AbstractModel
- implements ListValueModel<E>
-{
-
- /** The wrapped property value model. */
- protected final PropertyValueModel<? extends E> valueHolder;
-
- /** A listener that forwards any events fired by the value holder. */
- protected final PropertyChangeListener propertyChangeListener;
-
- /** Cache the value. */
- protected E value;
-
-
- // ********** constructors/initialization **********
-
- /**
- * Wrap the specified property value model.
- */
- public PropertyListValueModelAdapter(PropertyValueModel<? extends E> valueHolder) {
- super();
- if (valueHolder == null) {
- throw new NullPointerException();
- }
- this.valueHolder = valueHolder;
- this.propertyChangeListener = this.buildPropertyChangeListener();
- // postpone building the value and listening to the underlying value
- // until we have listeners ourselves...
- }
-
- @Override
- protected ChangeSupport buildChangeSupport() {
- return new SingleAspectChangeSupport(this, ListChangeListener.class, LIST_VALUES);
- }
-
- /**
- * The wrapped value has changed, forward an equivalent
- * list change event to our listeners.
- */
- protected PropertyChangeListener buildPropertyChangeListener() {
- return new PropertyChangeListener() {
- @SuppressWarnings("unchecked")
- public void propertyChanged(PropertyChangeEvent event) {
- PropertyListValueModelAdapter.this.valueChanged((E) event.getNewValue());
- }
- @Override
- public String toString() {
- return "property change listener";
- }
- };
- }
-
-
- // ********** ListValueModel implementation **********
-
- public Iterator<E> iterator() {
- return this.listIterator();
- }
-
- public ListIterator<E> listIterator() {
- return (this.value == null) ?
- EmptyListIterator.<E>instance()
- :
- new SingleElementListIterator<E>(this.value);
- }
-
- public int size() {
- return (this.value == null) ? 0 : 1;
- }
-
- public E get(int index) {
- if (this.value == null) {
- throw this.ioobe(index, 0);
- }
- if (index > 0) {
- throw this.ioobe(index, 1);
- }
- return this.value;
- }
-
- protected static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
- public Object[] toArray() {
- return (this.value == null) ? EMPTY_OBJECT_ARRAY : new Object[] {this.value};
- }
-
-
- // ********** extend change support **********
-
- /**
- * Override to start listening to the value holder if necessary.
- */
- @Override
- public void addListChangeListener(ListChangeListener listener) {
- if (this.hasNoListeners()) {
- this.engageModel();
- }
- super.addListChangeListener(listener);
- }
-
- /**
- * Override to start listening to the value holder if necessary.
- */
- @Override
- public void addListChangeListener(String listName, ListChangeListener listener) {
- if (listName == LIST_VALUES && this.hasNoListeners()) {
- this.engageModel();
- }
- super.addListChangeListener(listName, listener);
- }
-
- /**
- * Override to stop listening to the value holder if appropriate.
- */
- @Override
- public void removeListChangeListener(ListChangeListener listener) {
- super.removeListChangeListener(listener);
- if (this.hasNoListeners()) {
- this.disengageModel();
- }
- }
-
- /**
- * Override to stop listening to the value holder if appropriate.
- */
- @Override
- public void removeListChangeListener(String listName, ListChangeListener listener) {
- super.removeListChangeListener(listName, listener);
- if (listName == LIST_VALUES && this.hasNoListeners()) {
- this.disengageModel();
- }
- }
-
-
- // ********** queries **********
-
- protected boolean hasListeners() {
- return this.hasAnyListChangeListeners(LIST_VALUES);
- }
-
- protected boolean hasNoListeners() {
- return ! this.hasListeners();
- }
-
-
- // ********** behavior **********
-
- protected IndexOutOfBoundsException ioobe(int index, int size) {
- return new IndexOutOfBoundsException("Index: " + index + ", Size: " + size);
- }
-
- protected void engageModel() {
- this.valueHolder.addPropertyChangeListener(PropertyValueModel.VALUE, this.propertyChangeListener);
- // synch our value *after* we start listening to the value holder,
- // since its value might change when a listener is added
- this.value = this.valueHolder.getValue();
- }
-
- protected void disengageModel() {
- this.valueHolder.removePropertyChangeListener(PropertyValueModel.VALUE, this.propertyChangeListener);
- // clear out the value when we are not listening to the value holder
- this.value = null;
- }
-
- /**
- * synchronize our internal value with the wrapped value
- * and fire the appropriate events
- */
- protected void valueChanged(E newValue) {
- E oldValue = this.value;
- this.value = newValue;
- if (oldValue == null) {
- this.fireItemAdded(LIST_VALUES, 0, newValue);
- } else {
- if (newValue == null) {
- this.fireItemRemoved(LIST_VALUES, 0, oldValue);
- } else {
- this.fireItemReplaced(LIST_VALUES, 0, newValue, oldValue);
- }
- }
- }
-
- @Override
- public void toString(StringBuilder sb) {
- sb.append(this.valueHolder);
- }
-
-}

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