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Tomcat example source code file (ELContextImpl.java)

This example Tomcat source code file (ELContextImpl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

elcontext, elcontextimpl, elcontextimpl, elresolver, functionmapper, functionmapper, map, nullfunctionmapper, reflection, string, util, valueexpression, valueexpression, variablemapper, variablemapper, variablemapperimpl

The Tomcat ELContextImpl.java source code

/*
 * 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.jasper.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
 * 
 * @author Jacob Hookom
 */
public final class ELContextImpl extends ELContext {

    private final static FunctionMapper NullFunctionMapper = new FunctionMapper() {
        public Method resolveFunction(String prefix, String localName) {
            return null;
        }
    };

    private final static class VariableMapperImpl extends VariableMapper {

        private Map<String, ValueExpression> vars;

        public ValueExpression resolveVariable(String variable) {
            if (vars == null) {
                return null;
            }
            return vars.get(variable);
        }

        public ValueExpression setVariable(String variable,
                ValueExpression expression) {
            if (vars == null)
                vars = new HashMap<String, ValueExpression>();
            return vars.put(variable, expression);
        }

    }

    private final ELResolver resolver;

    private FunctionMapper functionMapper = NullFunctionMapper; // immutable

    private VariableMapper variableMapper;

    public ELContextImpl() {
        this(ELResolverImpl.DefaultResolver);
    }

    public ELContextImpl(ELResolver resolver) {
        this.resolver = resolver;
    }

    public ELResolver getELResolver() {
        return this.resolver;
    }

    public FunctionMapper getFunctionMapper() {
        return this.functionMapper;
    }

    public VariableMapper getVariableMapper() {
        if (this.variableMapper == null) {
            this.variableMapper = new VariableMapperImpl();
        }
        return this.variableMapper;
    }

    public void setFunctionMapper(FunctionMapper functionMapper) {
        this.functionMapper = functionMapper;
    }

    public void setVariableMapper(VariableMapper variableMapper) {
        this.variableMapper = variableMapper;
    }

}

Other Tomcat examples (source code examples)

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