/*
* 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 jakarta.el;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
public class MapELResolver extends ELResolver {
private static final Class<?> UNMODIFIABLE = Collections.unmodifiableMap(new HashMap<>()).getClass();
private final boolean readOnly;
public MapELResolver() {
this.readOnly = false;
}
public MapELResolver(boolean readOnly) {
this.readOnly = readOnly;
}
@Override
public Class<?> getType(ELContext context, Object base, Object property) {
Objects.requireNonNull(context);
if (base instanceof Map<?,?> map) {
context.setPropertyResolved(base, property);
if (readOnly || map.getClass() == UNMODIFIABLE) {
return null;
}
return Object.class;
}
return null;
}
@Override
public Object getValue(ELContext context, Object base, Object property) {
Objects.requireNonNull(context);
if (base instanceof Map<?,?>) {
context.setPropertyResolved(base, property);
return ((Map<?,?>) base).get(property);
}
return null;
}
@Override
public void setValue(ELContext context, Object base, Object property, Object value) {
Objects.requireNonNull(context);
if (base instanceof Map<?,?>) {
context.setPropertyResolved(base, property);
if (this.readOnly) {
throw new PropertyNotWritableException(
Util.message(context, "resolverNotWritable", 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) {
Objects.requireNonNull(context);
if (base instanceof Map<?,?>) {
context.setPropertyResolved(base, property);
return this.readOnly || UNMODIFIABLE.equals(base.getClass());
}
return this.readOnly;
}
@Override
public Class<?> getCommonPropertyType(ELContext context, Object base) {
if (base instanceof Map<?,?>) {
return Object.class;
}
return null;
}
}