/**
* 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.Arrays;
import java.util.LinkedList;
import java.util.List;
import org.apache.ambari.server.controller.spi.Predicate;
import org.apache.ambari.server.controller.spi.Resource;
/**
* Predicate which evaluates to true if all of the predicates in a predicate
* array evaluate to true.
*/
public class AndPredicate extends ArrayPredicate {
public AndPredicate(Predicate... predicates) {
super(predicates);
}
@Override
public Predicate create(Predicate... predicates) {
return instance(predicates);
}
public static Predicate instance(Predicate... predicates) {
List<Predicate> predicateList = new LinkedList<>();
// Simplify the predicate array
for (Predicate predicate : predicates) {
if (!(predicate instanceof AlwaysPredicate)) {
if (predicate instanceof AndPredicate) {
predicateList.addAll(Arrays.asList(((AndPredicate) predicate).getPredicates()));
}
else {
predicateList.add(predicate);
}
}
}
return predicateList.size() == 1 ?
predicateList.get(0) :
new AndPredicate(predicateList.toArray(new Predicate[predicateList.size()]));
}
@Override
public boolean evaluate(Resource resource) {
Predicate[] predicates = getPredicates();
for (Predicate predicate : predicates) {
if (!predicate.evaluate(resource)) {
return false;
}
}
return true;
}
@Override
public String getOperator() {
return "AND";
}
}