/*******************************************************************************
    * SAT4J: a SATisfiability library for Java Copyright (C) 2004, 2012 Artois University and CNRS
    *
    * All rights reserved. This program and the accompanying materials
    * are made available under the terms of the Eclipse Public License v1.0
    * which accompanies this distribution, and is available at
    *  http://www.eclipse.org/legal/epl-v10.html
    *
    * Alternatively, the contents of this file may be used under the terms of
   * either the GNU Lesser General Public License Version 2.1 or later (the
   * "LGPL"), in which case the provisions of the LGPL are applicable instead
   * of those above. If you wish to allow use of your version of this file only
   * under the terms of the LGPL, and not to allow others to use your version of
   * this file under the terms of the EPL, indicate your decision by deleting
   * the provisions above and replace them with the notice and other provisions
   * required by the LGPL. If you do not delete the provisions above, a recipient
   * may use your version of this file under the terms of the EPL or the LGPL.
   *
   * Based on the original MiniSat specification from:
   *
   * An extensible SAT solver. Niklas Een and Niklas Sorensson. Proceedings of the
   * Sixth International Conference on Theory and Applications of Satisfiability
   * Testing, LNCS 2919, pp 502-518, 2003.
   *
   * See www.minisat.se for the original solver in C++.
   *
   * Contributors:
   *   CRIL - initial API and implementation
   *******************************************************************************/
  
  package org.sat4j.pb.tools;
  
  import java.math.BigInteger;
  
  public final class WeightedObject<T> implements Comparable<WeightedObject<T>> {
  
  	public final T thing;
  	private BigInteger weight;
  
  	private WeightedObject(T thing, BigInteger weight) {
  		this.thing = thing;
  		this.weight = weight;
  	}
  
  	public BigInteger getWeight() {
  		return this.weight;
  	}
  
  	public void increaseWeight(BigInteger delta) {
  		this.weight = this.weight.add(delta);
  	}
  
  	public int compareTo(WeightedObject<T> arg0) {
  		return this.weight.compareTo(arg0.getWeight());
  	}
  
  	public static <E> WeightedObject<E> newWO(E e, int w) {
  		return new WeightedObject<E>(e, BigInteger.valueOf(w));
  	}
  
  	public static <E> WeightedObject<E> newWO(E e, long w) {
  		return new WeightedObject<E>(e, BigInteger.valueOf(w));
  	}
  
  	public static <E> WeightedObject<E> newWO(E e, BigInteger w) {
  		return new WeightedObject<E>(e, w);
  	}
  
  	@Override
  	public int hashCode() {
  		final int prime = 31;
  		int result = 1;
  		result = prime * result
  				+ (this.thing == null ? 0 : this.thing.hashCode());
  		result = prime * result
  				+ (this.weight == null ? 0 : this.weight.hashCode());
  		return result;
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		if (this == obj) {
  			return true;
  		}
  		if (obj == null) {
  			return false;
  		}
  		if (getClass() != obj.getClass()) {
  			return false;
  		}
  		WeightedObject<?> other = (WeightedObject<?>) obj;
  		if (this.thing == null) {
  			if (other.thing != null) {
  				return false;
  			}
  		} else if (!this.thing.equals(other.thing)) {
  			return false;
  		}
  		if (this.weight == null) {
 			if (other.weight != null) {
 				return false;
 			}
 		} else if (!this.weight.equals(other.weight)) {
 			return false;
 		}
 		return true;
 	}
 }