com.sun.faces.el.ELContextImpl Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of javax.faces Show documentation
This is the master POM file for Oracle's Implementation of the JSF 2.1 Specification.
There is a newer version: 2.4.0
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.faces.el;


import javax.el.ELContext;
import javax.el.ELResolver;
import javax.el.FunctionMapper;
import javax.el.ValueExpression;
import javax.el.VariableMapper;
import java.util.Map;
import java.util.HashMap;
import java.lang.reflect.Method;

/**
 * Concrete implementation of {@link javax.el.ELContext}.
 * ELContext's constructor is protected to control creation of ELContext
 * objects through their appropriate factory methods.  This version of
 * ELContext forces construction through FacesContextImpl.
 *
 */
public class ELContextImpl extends ELContext {
    
    private FunctionMapper functionMapper = new NoopFunctionMapper();
    private VariableMapper variableMapper;
    private ELResolver resolver;


    // ------------------------------------------------------------ Constructors


    /**
     * Constructs a new ELContext associated with the given ELResolver.
     * @param resolver the ELResolver to return from {@link #getELResolver()} 
     */
    public ELContextImpl(ELResolver resolver) {
        this.resolver = resolver;
    }


    // -------------------------------------------------- Methods from ELContext


    @Override
    public FunctionMapper getFunctionMapper() {        
        return functionMapper;
    }

    @Override
    public VariableMapper getVariableMapper() {
        if (variableMapper == null) {
            variableMapper = new VariableMapperImpl();
        }
        return variableMapper;
    }

    @Override
    public ELResolver getELResolver() {
        return resolver;
    }


    // ---------------------------------------------------------- Public Methods


    public void setFunctionMapper(FunctionMapper functionMapper) {

        this.functionMapper = functionMapper;

    }


    // ----------------------------------------------------------- Inner Classes


    private static class VariableMapperImpl extends VariableMapper {

        private Map variables;

        public VariableMapperImpl() {

            //noinspection CollectionWithoutInitialCapacity
            variables = new HashMap<>();

        }

        @Override
        public ValueExpression resolveVariable(String s) {
            return variables.get(s);
        }

        @Override
        public ValueExpression setVariable(String s, ValueExpression valueExpression) {
            return (variables.put(s, valueExpression));
        }
    }


    private static class NoopFunctionMapper extends FunctionMapper {

        @Override
        public Method resolveFunction(String s, String s1) {
            return null;
        }

    }

}