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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.ArrayELResolver;
import javax.el.BeanELResolver;
import javax.el.CompositeELResolver;
import javax.el.ELContext;
import javax.el.ELManager;
import javax.el.ELResolver;
import javax.el.ExpressionFactory;
import javax.el.FunctionMapper;
import javax.el.ListELResolver;
import javax.el.MapELResolver;
import javax.el.ResourceBundleELResolver;
import javax.el.StaticFieldELResolver;
import javax.el.ValueExpression;
import javax.el.VariableMapper;
import org.apache.jasper.Constants;
/**
* Implementation of ELContext.
*/
public class ELContextImpl extends ELContext {
private static final FunctionMapper NullFunctionMapper = new FunctionMapper() {
@Override
public Method resolveFunction(String prefix, String localName) {
return null;
}
};
private static final class VariableMapperImpl extends VariableMapper {
private Map<String,ValueExpression> vars;
@Override
public ValueExpression resolveVariable(String variable) {
if (vars == null) {
return null;
}
return vars.get(variable);
}
@Override
public ValueExpression setVariable(String variable, ValueExpression expression) {
if (vars == null) {
vars = new HashMap<>();
}
if (expression == null) {
return vars.remove(variable);
} else {
return vars.put(variable, expression);
}
}
}
private static final ELResolver DefaultResolver;
static {
if (Constants.IS_SECURITY_ENABLED) {
DefaultResolver = null;
} else {
DefaultResolver = new CompositeELResolver();
((CompositeELResolver) DefaultResolver).add(ELManager.getExpressionFactory().getStreamELResolver());
((CompositeELResolver) DefaultResolver).add(new StaticFieldELResolver());
((CompositeELResolver) DefaultResolver).add(new MapELResolver());
((CompositeELResolver) DefaultResolver).add(new ResourceBundleELResolver());
((CompositeELResolver) DefaultResolver).add(new ListELResolver());
((CompositeELResolver) DefaultResolver).add(new ArrayELResolver());
((CompositeELResolver) DefaultResolver).add(new BeanELResolver());
}
}
private final ELResolver resolver;
private FunctionMapper functionMapper = NullFunctionMapper;
private VariableMapper variableMapper;
public ELContextImpl(ExpressionFactory factory) {
this(getDefaultResolver(factory));
}
public ELContextImpl(ELResolver resolver) {
this.resolver = resolver;
}
@Override
public ELResolver getELResolver() {
return this.resolver;
}
@Override
public FunctionMapper getFunctionMapper() {
return this.functionMapper;
}
@Override
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;
}
public static ELResolver getDefaultResolver(ExpressionFactory factory) {
if (Constants.IS_SECURITY_ENABLED) {
CompositeELResolver defaultResolver = new CompositeELResolver();
defaultResolver.add(factory.getStreamELResolver());
defaultResolver.add(new StaticFieldELResolver());
defaultResolver.add(new MapELResolver());
defaultResolver.add(new ResourceBundleELResolver());
defaultResolver.add(new ListELResolver());
defaultResolver.add(new ArrayELResolver());
defaultResolver.add(new BeanELResolver());
return defaultResolver;
} else {
return DefaultResolver;
}
}
}
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