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/*
* 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;
}
}
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