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Diffstat (limited to 'common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/model/value/AbstractListValueModel.java')
-rw-r--r-- | common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/model/value/AbstractListValueModel.java | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/model/value/AbstractListValueModel.java b/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/model/value/AbstractListValueModel.java deleted file mode 100644 index b182a52764..0000000000 --- a/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/internal/model/value/AbstractListValueModel.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.common.utility.internal.model.value; - -import org.eclipse.jpt.common.utility.internal.model.AbstractModel; -import org.eclipse.jpt.common.utility.internal.model.ChangeSupport; -import org.eclipse.jpt.common.utility.internal.model.SingleAspectChangeSupport; -import org.eclipse.jpt.common.utility.model.listener.ChangeListener; -import org.eclipse.jpt.common.utility.model.listener.ListChangeListener; -import org.eclipse.jpt.common.utility.model.value.ListValueModel; - -/** - * 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 list change - * events. Subclasses must implement the appropriate {@link ListValueModel}. - * <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 AbstractListValueModel - extends AbstractModel -{ - - // ********** constructor/initialization ********** - - protected AbstractListValueModel() { - super(); - } - - @Override - protected ChangeSupport buildChangeSupport() { - return new SingleAspectChangeSupport(this, ListChangeListener.class, ListValueModel.LIST_VALUES); - } - - - // ********** extend change support ********** - - /** - * Extend to start listening to the underlying model if necessary. - */ - @Override - public void addChangeListener(ChangeListener listener) { - if (this.hasNoListeners()) { - this.engageModel(); - } - super.addChangeListener(listener); - } - - /** - * Extend to start listening to the underlying model if necessary. - */ - @Override - public void addListChangeListener(String listName, ListChangeListener listener) { - if (listName.equals(ListValueModel.LIST_VALUES) && this.hasNoListeners()) { - this.engageModel(); - } - super.addListChangeListener(listName, listener); - } - - /** - * Extend to stop listening to the underlying model if necessary. - */ - @Override - public void removeChangeListener(ChangeListener listener) { - super.removeChangeListener(listener); - if (this.hasNoListeners()) { - this.disengageModel(); - } - } - - /** - * Extend to stop listening to the underlying model if necessary. - */ - @Override - public void removeListChangeListener(String listName, ListChangeListener listener) { - super.removeListChangeListener(listName, listener); - if (listName.equals(ListValueModel.LIST_VALUES) && this.hasNoListeners()) { - this.disengageModel(); - } - } - - - // ********** queries ********** - - /** - * Return whether the model has no collection value listeners. - */ - protected boolean hasNoListeners() { - return ! this.hasListeners(); - } - - /** - * Return whether the model has any collection value listeners. - */ - protected boolean hasListeners() { - return this.hasAnyListChangeListeners(ListValueModel.LIST_VALUES); - } - - - // ********** behavior ********** - - /** - * Engage the underlying model. - */ - protected abstract void engageModel(); - - /** - * Stop listening to the underlying model. - */ - protected abstract void disengageModel(); - -} |