55 lines
1.8 KiB
Java
55 lines
1.8 KiB
Java
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/*
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* PointComparator.java 2005-05-12
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*
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* Dirk Ansorge, FernUniversitaet Hagen
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*
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*/
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package twodsack.util.comparator;
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import twodsack.setelement.datatype.*;
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import twodsack.setelement.datatype.basicdatatype.*;
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import twodsack.util.collectiontype.*;
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import java.util.*;
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import java.io.Serializable;
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/**
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* A PointComparator is used wherever objects of type {@link Point} shall be inserted in a sorted set working with objects of type {@link MultiSetEntry}.
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* Then, in the constructor an instance of this
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* constructor is needed. It sorts the Point objects by calling the <tt>Point.compare()</tt> method.
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*/
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public class PointComparator implements Comparator,Serializable {
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/*
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* constructors
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*/
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/**
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* The standard constructor.
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*/
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public PointComparator(){}
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/*
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* methods
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*/
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/**
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* Compares both objects and returns one of {0, 1, -1}.
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* Calls the <tt>compare()</tt> method for two Point values stored in MultiSetEntry types.
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* Returns 0, if both points are equal.<p>
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* Returns -1, if <tt>ino1.o</tt> is smaller than <tt>ino2.o</tt>.<p>
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* Returns 1 otherwise.
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*
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* @param ino1 the first object
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* @param ino2 the second object
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* @return one of {0, 1, -1} as int
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* @throws WrongTypeException if <tt>ino1.o</tt> or <tt>ino2.o</tt> is not of type Point
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*/
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public int compare(Object ino1, Object ino2) throws WrongTypeException {
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if ((((MultiSetEntry)ino1).value instanceof Point) &&
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(((MultiSetEntry)ino2).value instanceof Point))
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return ((Point)((MultiSetEntry)ino1).value).compare((Point)((MultiSetEntry)ino2).value);
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else
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throw new WrongTypeException("in PointComparator: Expected Point - found: "+((MultiSetEntry)ino1).value.getClass()+"/"+((MultiSetEntry)ino2).value.getClass());
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}//end method compare
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}//end class PointComparator
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