| /* |
| * $Id$ |
| * |
| * 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.tiles.el; |
| |
| import java.lang.reflect.Method; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import javax.el.ELContext; |
| import javax.el.ELResolver; |
| import javax.el.FunctionMapper; |
| import javax.el.ValueExpression; |
| import javax.el.VariableMapper; |
| |
| /** |
| * Implementation of ELContext.<br> |
| * Copied from Apache Tomcat 6.0.16 source code. |
| * |
| * @since 2.2.1 |
| */ |
| public class ELContextImpl extends ELContext { |
| |
| /** |
| * A null function mapper. |
| */ |
| private static final FunctionMapper NULL_FUNCTION_MAPPER = new FunctionMapper() { |
| @Override |
| public Method resolveFunction(String prefix, String localName) { |
| return null; |
| } |
| }; |
| |
| /** |
| * Default implementation for the variable mapper. |
| */ |
| private static final class VariableMapperImpl extends VariableMapper { |
| |
| /** |
| * The mapped variables. |
| */ |
| private Map<String, ValueExpression> vars; |
| |
| /** {@inheritDoc} */ |
| @Override |
| public ValueExpression resolveVariable(String variable) { |
| if (vars == null) { |
| return null; |
| } |
| return vars.get(variable); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public ValueExpression setVariable(String variable, |
| ValueExpression expression) { |
| if (vars == null) { |
| vars = new HashMap<String, ValueExpression>(); |
| } |
| return vars.put(variable, expression); |
| } |
| |
| } |
| |
| /** |
| * The EL resolver to use. |
| */ |
| private final ELResolver resolver; |
| |
| /** |
| * The function mapper to use. |
| */ |
| private FunctionMapper functionMapper = NULL_FUNCTION_MAPPER; |
| |
| /** |
| * The variable mapper to use. |
| */ |
| private VariableMapper variableMapper; |
| |
| /** |
| * Constructor. |
| * |
| * @param resolver The resolver to use. |
| */ |
| public ELContextImpl(ELResolver resolver) { |
| this.resolver = resolver; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public ELResolver getELResolver() { |
| return this.resolver; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public FunctionMapper getFunctionMapper() { |
| return this.functionMapper; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public VariableMapper getVariableMapper() { |
| if (this.variableMapper == null) { |
| this.variableMapper = new VariableMapperImpl(); |
| } |
| return this.variableMapper; |
| } |
| |
| /** |
| * Sets the function mapper to use. |
| * |
| * @param functionMapper The function mapper. |
| * @since 2.2.1 |
| */ |
| public void setFunctionMapper(FunctionMapper functionMapper) { |
| this.functionMapper = functionMapper; |
| } |
| |
| /** |
| * Sets the variable mapper to use. |
| * |
| * @param variableMapper The variable mapper. |
| * @since 2.2.1 |
| */ |
| public void setVariableMapper(VariableMapper variableMapper) { |
| this.variableMapper = variableMapper; |
| } |
| } |