| /******************************************************************************* |
| * Copyright (c) 2006, 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.AST; |
| import org.eclipse.jdt.core.dom.BooleanLiteral; |
| import org.eclipse.jdt.core.dom.Expression; |
| import org.eclipse.jpt.common.core.utility.jdt.ExpressionConverter; |
| |
| /** |
| * Convert a boolean literal to/from a Boolean |
| * (e.g. Boolean.TRUE). |
| */ |
| public final class BooleanExpressionConverter |
| extends AbstractExpressionConverter<Boolean> |
| { |
| private static final ExpressionConverter<Boolean> INSTANCE = new BooleanExpressionConverter(); |
| |
| /** |
| * Return the singleton. |
| */ |
| public static ExpressionConverter<Boolean> instance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Ensure single instance. |
| */ |
| private BooleanExpressionConverter() { |
| super(); |
| } |
| |
| @Override |
| protected BooleanLiteral convertObject(Boolean booleanObject, AST ast) { |
| return ast.newBooleanLiteral(booleanObject.booleanValue()); |
| } |
| |
| @Override |
| protected Boolean convertExpression(Expression expression) { |
| Object value = expression.resolveConstantExpressionValue(); |
| return (value instanceof Boolean) ? ((Boolean) value) : null; |
| } |
| |
| } |