/*
* 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.myfaces.test.el;
import java.beans.FeatureDescriptor;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.el.ELContext;
import javax.el.PropertyNotWritableException;
/**
* {@code ELResolver} for reserved words.
*/
public class ReservedWordsELResolver extends AbstractELResolver {
private static final Map<String, Object> VALUES;
static {
HashMap<String, Object> values = new HashMap<String, Object>();
values.put("true", Boolean.TRUE);
values.put("false", Boolean.FALSE);
values.put("null", null);
VALUES = Collections.unmodifiableMap(values);
}
private List<FeatureDescriptor> featureDescriptors;
@Override
public Object getValue(ELContext context, Object base, Object property) {
if (base == null && VALUES.containsKey(property)) {
context.setPropertyResolved(true);
return VALUES.get(property);
}
return null;
}
@Override
public Class<?> getType(ELContext context, Object base, Object property) {
if (base == null && VALUES.containsKey(property)) {
context.setPropertyResolved(true);
Object value = VALUES.get(property);
return value == null ? null : value.getClass();
}
return null;
}
@Override
public void setValue(ELContext context, Object base, Object property,
Object value) {
if (base == null && VALUES.containsKey(property)) {
context.setPropertyResolved(true);
throw new PropertyNotWritableException(property.toString());
}
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property) {
if (base == null && VALUES.containsKey(property)) {
context.setPropertyResolved(true);
return true;
}
return false;
}
@Override
public synchronized Iterator<FeatureDescriptor> getFeatureDescriptors(
ELContext context, Object base) {
if (featureDescriptors == null) {
featureDescriptors = new ArrayList<FeatureDescriptor>();
for (Map.Entry<String, Object> e : VALUES.entrySet()) {
final Class<?> type =
e.getValue() == null ? null : e.getValue().getClass();
featureDescriptors.add(descriptor(e.getKey(), e.getKey(),
e.getKey(), false, false, true, type, true));
}
featureDescriptors =
Collections.unmodifiableList(featureDescriptors);
}
return featureDescriptors.iterator();
}
@Override
public Class<?> getCommonPropertyType(ELContext context, Object base) {
return base == null ? String.class : null;
}
}