/*
* 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 javax.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;
public class MapELResolver extends ELResolver {
private static final Class<?> UNMODIFIABLE = Collections.unmodifiableMap(
new HashMap<Object, Object>()).getClass();
private final boolean readOnly;
public MapELResolver() {
this.readOnly = false;
}
public MapELResolver(boolean readOnly) {
this.readOnly = readOnly;
}
@Override
public Object getValue(ELContext context, Object base, Object property)
throws NullPointerException, PropertyNotFoundException, ELException {
if (context == null) {
throw new NullPointerException();
}
if (base instanceof Map<?,?>) {
context.setPropertyResolved(true);
return ((Map<?,?>) base).get(property);
}
return null;
}
@Override
public Class<?> getType(ELContext context, Object base, Object property)
throws NullPointerException, PropertyNotFoundException, ELException {
if (context == null) {
throw new NullPointerException();
}
if (base instanceof Map<?,?>) {
context.setPropertyResolved(true);
return Object.class;
}
return null;
}
@Override
public void setValue(ELContext context, Object base, Object property,
Object value) throws NullPointerException,
PropertyNotFoundException, PropertyNotWritableException,
ELException {
if (context == null) {
throw new NullPointerException();
}
if (base instanceof Map<?, ?>) {
context.setPropertyResolved(true);
if (this.readOnly) {
throw new PropertyNotWritableException(Util.message(context,
"resolverNotWriteable", new Object[] { base.getClass()
.getName() }));
}
try {
@SuppressWarnings("unchecked") // Must be OK
Map<Object, Object> map = ((Map<Object, Object>) base);
map.put(property, value);
} catch (UnsupportedOperationException e) {
throw new PropertyNotWritableException(e);
}
}
}
@Override
public boolean isReadOnly(ELContext context, Object base, Object property)
throws NullPointerException, PropertyNotFoundException, ELException {
if (context == null) {
throw new NullPointerException();
}
if (base instanceof Map<?, ?>) {
context.setPropertyResolved(true);
return this.readOnly || UNMODIFIABLE.equals(base.getClass());
}
return this.readOnly;
}
@Override
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
if (base instanceof Map<?, ?>) {
Iterator<?> itr = ((Map<?, ?>) base).keySet().iterator();
List<FeatureDescriptor> feats = new ArrayList<FeatureDescriptor>();
Object key;
FeatureDescriptor desc;
while (itr.hasNext()) {
key = itr.next();
desc = new FeatureDescriptor();
desc.setDisplayName(key.toString());
desc.setShortDescription("");
desc.setExpert(false);
desc.setHidden(false);
desc.setName(key.toString());
desc.setPreferred(true);
desc.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
desc.setValue(TYPE, key.getClass());
feats.add(desc);
}
return feats.iterator();
}
return null;
}
@Override
public Class<?> getCommonPropertyType(ELContext context, Object base) {
if (base instanceof Map<?, ?>) {
return Object.class;
}
return null;
}
}