| /******************************************************************************* |
| * 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.common.core.internal.utility.jdt; |
| |
| import org.eclipse.jdt.core.dom.ASTNode; |
| import org.eclipse.jdt.core.dom.Expression; |
| import org.eclipse.jpt.common.core.utility.jdt.DeclarationAnnotationElementAdapter; |
| import org.eclipse.jpt.common.core.utility.jdt.ModifiedDeclaration; |
| |
| /** |
| * Behaviorless implementation. |
| */ |
| public class NullDeclarationAnnotationElementAdapter<T> |
| implements DeclarationAnnotationElementAdapter<T> |
| { |
| |
| // singleton |
| @SuppressWarnings("rawtypes") |
| private static final DeclarationAnnotationElementAdapter INSTANCE |
| = new NullDeclarationAnnotationElementAdapter(); |
| |
| /** |
| * Return the singleton. |
| */ |
| @SuppressWarnings("unchecked") |
| public static <S> DeclarationAnnotationElementAdapter<S> instance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Ensure single instance. |
| */ |
| private NullDeclarationAnnotationElementAdapter() { |
| super(); |
| } |
| |
| public T getValue(ModifiedDeclaration declaration) { |
| return null; |
| } |
| |
| public void setValue(T value, ModifiedDeclaration declaration) { |
| // do nothing |
| } |
| |
| public ASTNode getAstNode(ModifiedDeclaration declaration) { |
| return declaration.getDeclaration(); |
| } |
| |
| public Expression getExpression(ModifiedDeclaration declaration) { |
| return null; |
| } |
| |
| } |