| /******************************************************************************* |
| * Copyright (c) 2006, 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.core.internal.jdtutility; |
| |
| import org.eclipse.jdt.core.dom.AST; |
| import org.eclipse.jdt.core.dom.ASTNode; |
| import org.eclipse.jdt.core.dom.Expression; |
| import org.eclipse.jdt.core.dom.NumberLiteral; |
| |
| /** |
| * Convert an expression to/from a string representation of a number |
| * (e.g. "48"). |
| */ |
| public final class NumberStringExpressionConverter extends AbstractExpressionConverter { |
| private static ExpressionConverter INSTANCE; |
| |
| /** |
| * Return the singleton. |
| */ |
| public static ExpressionConverter instance() { |
| if (INSTANCE == null) { |
| INSTANCE = new NumberStringExpressionConverter(); |
| } |
| return INSTANCE; |
| } |
| |
| /** |
| * Ensure non-instantiability. |
| */ |
| private NumberStringExpressionConverter() { |
| super(); |
| } |
| |
| @Override |
| protected Expression convert_(Object o, AST ast) { |
| return ast.newNumberLiteral((String) o); |
| } |
| |
| @Override |
| protected Object convert_(Expression expression) { |
| return (expression.getNodeType() == ASTNode.NUMBER_LITERAL) ? |
| ((NumberLiteral) expression).getToken() |
| : |
| null; |
| } |
| |
| } |