| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.cocoon.components.variables; |
| |
| import org.apache.cocoon.sitemap.PatternException; |
| |
| /** |
| * No-op implementation of {@link VariableResolver} for constant expressions |
| * |
| * @author <a href="mailto:cziegeler@apache.org">Carsten Ziegeler</a> |
| * |
| * @version CVS $Id$ |
| */ |
| public class NOPVariableResolver |
| implements VariableResolver { |
| |
| protected String expression; |
| |
| public NOPVariableResolver(String expression) { |
| this.expression = this.unescape(expression); |
| } |
| |
| /** |
| * Unescape an expression that doesn't need to be resolved, but may contain |
| * escaped '{' characters. |
| * |
| * @param expression the expression to unescape. |
| * @return the unescaped result, or <code>expression</code> if unescaping isn't necessary. |
| */ |
| protected String unescape(String expression) { |
| // Does it need escaping ? |
| if (expression == null || expression.indexOf("\\{") == -1) { |
| return expression; |
| } |
| |
| StringBuffer buf = new StringBuffer(); |
| for (int i = 0; i < expression.length(); i++) { |
| char ch = expression.charAt(i); |
| if (ch != '\\' || i >= (expression.length() - 1) || expression.charAt(i+1) != '{') { |
| buf.append(ch); |
| } |
| } |
| |
| return buf.toString(); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.cocoon.components.variables.VariableResolver#resolve() |
| */ |
| public String resolve() throws PatternException { |
| return this.expression; |
| } |
| |
| } |