/* | |
* 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; | |
} | |
} |