| /******************************************************************************* |
| * 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.core.internal.utility.jdt; |
| |
| import org.eclipse.jdt.core.dom.AST; |
| import org.eclipse.jdt.core.dom.Expression; |
| import org.eclipse.jdt.core.dom.StringLiteral; |
| import org.eclipse.jpt.core.utility.jdt.ExpressionConverter; |
| |
| /** |
| * Convert a string literal to/from a string (e.g. "text"). |
| */ |
| public final class StringExpressionConverter |
| extends AbstractExpressionConverter<String> |
| { |
| private static final ExpressionConverter<String> INSTANCE = new StringExpressionConverter(); |
| |
| /** |
| * Return the singleton. |
| */ |
| public static ExpressionConverter<String> instance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Ensure single instance. |
| */ |
| private StringExpressionConverter() { |
| super(); |
| } |
| |
| @Override |
| protected StringLiteral convertObject(String string, AST ast) { |
| StringLiteral stringLiteral = ast.newStringLiteral(); |
| stringLiteral.setLiteralValue(string); |
| return stringLiteral; |
| } |
| |
| @Override |
| protected String convertExpression(Expression expression) { |
| Object value = expression.resolveConstantExpressionValue(); |
| return (value instanceof String) ? (String) value : null; |
| } |
| |
| } |