org.apache.jasper.el.ELContextImpl Maven / Gradle / Ivy
/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed 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 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();
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;
}
}