/*
* 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.collections.functors;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import org.apache.ambari.server.collections.PredicateUtils;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.functors.PredicateDecorator;
/**
* {@link AndPredicate} wraps {@link org.apache.commons.collections.functors.AndPredicate} to
* provide additional functionality like serializing to and from a Map and JSON formatted data.
* <p>
* See {@link DelegatedMultiplePredicateContainer}
*/
public class AndPredicate extends DelegatedMultiplePredicateContainer {
/**
* The name of this {@link org.apache.ambari.server.collections.Predicate} implementation
*/
public static final String NAME = "and";
/**
* Creates a new {@link AndPredicate} using the given {@link Map} of data.
* <p>
* It is expected that the map contains a single {@link java.util.Map.Entry} where the key name
* is "and" and the value is a {@link Collection} of {@link Map}s representing the contained
* predicates.
*
* @return a new {@link AndPredicate}
*/
public static AndPredicate fromMap(Map<String, Object> map) {
Object data = (map == null) ? null : map.get(NAME);
if (data == null) {
throw new IllegalArgumentException("Missing data for '" + NAME + "' operation");
} else if (data instanceof Collection) {
Collection<?> collection = (Collection) data;
if (collection.size() == 2) {
Iterator<?> iterator = collection.iterator();
Object d1 = iterator.next();
Object d2 = iterator.next();
if ((d1 instanceof Map) && (d2 instanceof Map)) {
return new AndPredicate(PredicateUtils.fromMap((Map) d1), PredicateUtils.fromMap((Map) d2));
} else {
throw new IllegalArgumentException(String.format("Unexpected data types for predicates: %s and %s", d1.getClass().getName(), d2.getClass().getName()));
}
} else {
throw new IllegalArgumentException(String.format("Missing data for '" + NAME + "' operation - 2 predicates are needed, %d found", collection.size()));
}
} else {
throw new IllegalArgumentException(String.format("Unexpected data type for '" + NAME + "' operation - %s", data.getClass().getName()));
}
}
/**
* Constructor.
*
* @param predicate1 the first predicate to process
* @param predicate2 the second predicate to process (if the first one yields <code>true</code>
*/
public AndPredicate(Predicate predicate1, Predicate predicate2) {
super(NAME,
(PredicateDecorator) org.apache.commons.collections.functors.AndPredicate.getInstance(predicate1, predicate2));
}
@Override
public int hashCode() {
return super.hashCode() + this.getClass().getName().hashCode();
}
@Override
public boolean equals(Object obj) {
return (obj == this) ||
((obj != null) && (super.equals(obj) && this.getClass().isInstance(obj) && (hashCode() == obj.hashCode())));
}
}