/*
* 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.Map;
import org.apache.ambari.server.collections.PredicateUtils;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.functors.PredicateDecorator;
/**
* {@link NotPredicate} wraps {@link org.apache.commons.collections.functors.NotPredicate} to
* provide additional functionality like serializing to and from a Map and JSON formatted data.
* <p>
* See {@link DelegatedSinglePredicateContainer}
*/
public class NotPredicate extends DelegatedSinglePredicateContainer {
/**
* The name of this {@link org.apache.ambari.server.collections.Predicate} implementation
*/
public static final String NAME = "not";
/**
* Creates a new {@link NotPredicate} 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 "not" and the value is a {@link Map} representing the contained predicate.
*
* @return a new {@link NotPredicate}
*/
public static NotPredicate 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 Map) {
return new NotPredicate(PredicateUtils.fromMap((Map) data));
} else {
throw new IllegalArgumentException("Missing data for '" + NAME + "' operation");
}
}
/**
* Constructor.
*
* @param predicate the predicate to negate
*/
public NotPredicate(Predicate predicate) {
super(NAME,
(PredicateDecorator) org.apache.commons.collections.functors.NotPredicate.getInstance(predicate));
}
@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())));
}
}