/*
* 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 static org.apache.jasper.JasperMessages.MESSAGES;
import java.util.Iterator;
import javax.el.ArrayELResolver;
import javax.el.BeanELResolver;
import javax.el.CompositeELResolver;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ELManager;
import javax.el.ELResolver;
import javax.el.ExpressionFactory;
import javax.el.ListELResolver;
import javax.el.MapELResolver;
import javax.el.PropertyNotFoundException;
import javax.el.PropertyNotWritableException;
import javax.el.ResourceBundleELResolver;
import javax.el.StaticFieldELResolver;
import javax.servlet.jsp.el.VariableResolver;
import org.apache.jasper.Constants;
public final class ELResolverImpl extends ELResolver {
public static final boolean NEW_RESOLVER_INSTANCE =
Boolean.valueOf(System.getProperty("org.apache.jasper.el.ELResolverImpl.NEW_RESOLVER_INSTANCE", "false")).booleanValue();
private final static ELResolver DefaultResolver = new CompositeELResolver();
static {
((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 VariableResolver variableResolver;
private final ExpressionFactory factory;
public ELResolverImpl(VariableResolver variableResolver, ExpressionFactory factory) {
this.variableResolver = variableResolver;
this.factory = factory;
}
public Object getValue(ELContext context, Object base, Object property)
throws NullPointerException, PropertyNotFoundException, ELException {
if (context == null) {
throw MESSAGES.elResolverNullContext();
}
if (base == null) {
context.setPropertyResolved(true);
if (property != null) {
try {
return this.variableResolver.resolveVariable(property
.toString());
} catch (javax.servlet.jsp.el.ELException e) {
throw new ELException(MESSAGES.errorResolvingVariable
(property.toString(), e.getMessage()), e.getCause());
}
}
}
if (!context.isPropertyResolved()) {
return getDefaultResolver(factory).getValue(context, base, property);
}
return null;
}
public Class<?> getType(ELContext context, Object base, Object property)
throws NullPointerException, PropertyNotFoundException, ELException {
if (context == null) {
throw MESSAGES.elResolverNullContext();
}
if (base == null) {
context.setPropertyResolved(true);
if (property != null) {
try {
Object obj = this.variableResolver.resolveVariable(property
.toString());
return (obj != null) ? obj.getClass() : null;
} catch (javax.servlet.jsp.el.ELException e) {
throw new ELException(MESSAGES.errorResolvingVariable
(property.toString(), e.getMessage()), e.getCause());
}
}
}
if (!context.isPropertyResolved()) {
return getDefaultResolver(factory).getType(context, base, property);
}
return null;
}
public void setValue(ELContext context, Object base, Object property,
Object value) throws NullPointerException,
PropertyNotFoundException, PropertyNotWritableException,
ELException {
if (context == null) {
throw MESSAGES.elResolverNullContext();
}
if (base == null) {
context.setPropertyResolved(true);
throw new PropertyNotWritableException(MESSAGES.legacyVariableResolver());
}
if (!context.isPropertyResolved()) {
getDefaultResolver(factory).setValue(context, base, property, value);
}
}
public boolean isReadOnly(ELContext context, Object base, Object property)
throws NullPointerException, PropertyNotFoundException, ELException {
if (context == null) {
throw MESSAGES.elResolverNullContext();
}
if (base == null) {
context.setPropertyResolved(true);
return true;
}
return getDefaultResolver(factory).isReadOnly(context, base, property);
}
public Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
return getDefaultResolver(factory).getFeatureDescriptors(context, base);
}
public Class<?> getCommonPropertyType(ELContext context, Object base) {
if (base == null) {
return String.class;
}
return getDefaultResolver(factory).getCommonPropertyType(context, base);
}
public static ELResolver getDefaultResolver(ExpressionFactory factory) {
if (NEW_RESOLVER_INSTANCE && 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;
}
}
}