/**
* 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.ambari.server.controller.predicate;
import java.util.Map;
import org.apache.ambari.server.controller.spi.Resource;
/**
* Predicate that checks if the associated property category is empty. If the associated
* property id references a Map property then treat the Map as a category.
*/
public class CategoryIsEmptyPredicate extends CategoryPredicate {
public CategoryIsEmptyPredicate(String propertyId) {
super(propertyId);
}
@Override
public boolean evaluate(Resource resource) {
String propertyId = getPropertyId();
// If the property exists as a Map then check isEmpty
Object value = resource.getPropertyValue(propertyId);
if (value instanceof Map) {
Map<?,?> mapValue = (Map) value;
return mapValue.isEmpty();
}
// Get the category
Map<String, Object> properties = resource.getPropertiesMap().get(propertyId);
return properties == null ? true : properties.isEmpty();
}
// ----- Object overrides --------------------------------------------------
@Override
public String toString() {
return "isEmpty(" + getPropertyId() + ")";
}
}