org.apache.brooklyn.policy.followthesun.WeightedObject Maven / Gradle / Ivy

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/*
 * 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.brooklyn.policy.followthesun;

public class WeightedObject implements Comparable>{
    
    final T object;
    final double weight;
    
    public WeightedObject(T obj, double weight) {
        this.object = obj;
        this.weight = weight;
    }
    
    public T getObject() {
        return object;
    }
    
    public double getWeight() {
        return weight;
    }

    /**
     * Note that equals and compareTo are not consistent: x.compareTo(y)==0 iff x.equals(y) is 
     * highly recommended in Java, but is not required. This can make TreeSet etc behave poorly...
     */
    @Override
    public int compareTo(WeightedObject o) {
        double diff = o.getWeight() - weight;
        if (diff>0.0000000000000001) return -1;
        if (diff<-0.0000000000000001) return 1;
        return 0;
    }

    @Override
    /** true irrespective of weight */
    public boolean equals(Object obj) {
        if (!(obj instanceof WeightedObject)) return false;
        if (getObject()==null) {
            return ((WeightedObject)obj).getObject() == null;
        } else {
            return getObject().equals( ((WeightedObject)obj).getObject() );
        }
    }
    
    @Override
    public int hashCode() {
        if (getObject()==null) return 234519078;
        return getObject().hashCode();
    }
    
    @Override
    public String toString() {
        return ""+getObject()+"["+getWeight()+"]";
    }
}