58 lines
1.9 KiB
Java
58 lines
1.9 KiB
Java
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/*
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* ElemPairComparator.java 2004-11-05
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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.*;
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import twodsack.setelement.datatype.*;
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import twodsack.util.collectiontype.*;
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import java.util.Comparator;
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/**
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* An <code>ElemPairComparator</code> is a comparator that is used for the comparison of two objects of
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* type {@link twodsack.setelement.ElemPair}. This comparator is used as parameter for the construction of a
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* {@link twodsack.util.collection.MultiSet} or for one of its subclasses.
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*/
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public class ElemPairComparator implements Comparator {
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/*
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* constructors
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*/
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/**
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* Constructs an 'empty' instance.
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*/
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public ElemPairComparator(){}
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/*
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* methods
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*/
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/**
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* Compares two objects which must be of type <code>MultiSetEntry</code>.
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* The objects wrapped inside of <code>ino1</code> and <code>ino2</code> must be of type
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* {@link ElemPair}. The elements inside of those <code>ElemPair</code>s themselves must
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* be of the same type implementing the {@link Element} class.
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* <p>The return value is 0 if both pairs are equal, -1 if <code>ino1</code> is smaller than
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* <code>ino2</code> and 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 {0,-1,1} depending on the objects
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*/
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public int compare(Object ino1, Object ino2) {
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if ((((MultiSetEntry)ino1).value instanceof ElemPair) &&
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(((MultiSetEntry)ino2).value instanceof ElemPair))
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return ((ElemPair)(((MultiSetEntry)ino1).value)).compare((ElemPair)(((MultiSetEntry)ino2).value));
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else
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throw new WrongTypeException("in ElemPairComparator: Expected ElemPair - found: "+((MultiSetEntry)ino1).value.getClass()+"/"+((MultiSetEntry)ino2).value.getClass());
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}//end method compare
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}//end class ElemPairComparator
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