org.activiti.engine.impl.el.ReadOnlyMapELResolver Maven / Gradle / Ivy
/* Licensed 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.activiti.engine.impl.el;
import org.activiti.engine.ActivitiException;
import javax.el.ELContext;
import javax.el.ELResolver;
import java.beans.FeatureDescriptor;
import java.util.Iterator;
import java.util.Map;
/**
* An {@link ELResolver} that exposed object values in the map, under the name of the entry's key. The values in the map are only returned when requested property has no 'base', meaning it's a
* root-object.
*
*/
public class ReadOnlyMapELResolver extends ELResolver {
protected Map wrappedMap;
public ReadOnlyMapELResolver(Map map) {
this.wrappedMap = map;
}
public Object getValue(ELContext context, Object base, Object property) {
if (base == null) {
if (wrappedMap.containsKey(property)) {
context.setPropertyResolved(true);
return wrappedMap.get(property);
}
}
return null;
}
public boolean isReadOnly(ELContext context, Object base, Object property) {
return true;
}
public void setValue(ELContext context, Object base, Object property, Object value) {
if (base == null) {
if (wrappedMap.containsKey(property)) {
throw new ActivitiException("Cannot set value of '" + property + "', it's readonly!");
}
}
}
public Class getCommonPropertyType(ELContext context, Object arg) {
return Object.class;
}
public Iterator getFeatureDescriptors(ELContext context, Object arg) {
return null;
}
public Class getType(ELContext context, Object arg1, Object arg2) {
return Object.class;
}
}