| /******************************************************************************* |
| * Copyright (c) 2007 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.StringTools; |
| import org.eclipse.jpt.utility.internal.model.NullModel; |
| |
| /** |
| * Implementation of ValueModel that can be subclassed and used for |
| * returning a static value, but still allows listeners to be added. |
| * Listeners will NEVER be notified of any changes, because there should be none. |
| * Subclasses need only implement the #value() method to |
| * return the static value required by the client code. This class is |
| * really only useful for simplifying the building of anonymous inner |
| * classes that implement the PropertyValueModel interface: |
| * private PropertyValueModel buildAbstractModifierHolder() { |
| * return new AbstractReadOnlyPropertyValueModel() { |
| * public Object value() { |
| * return Modifier.ABSTRACT; |
| * } |
| * }; |
| * } |
| */ |
| public abstract class AbstractReadOnlyPropertyValueModel |
| extends NullModel |
| implements PropertyValueModel |
| { |
| private static final long serialVersionUID = 1L; |
| |
| /** |
| * Default constructor. |
| */ |
| protected AbstractReadOnlyPropertyValueModel() { |
| super(); |
| } |
| |
| |
| // ********** PropertyValueModel implementation ********** |
| |
| public void setValue(Object value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| |
| // ********** Object overrides ********** |
| |
| @Override |
| public String toString() { |
| return StringTools.buildToStringFor(this, this.value()); |
| } |
| |
| } |