56 lines
1.9 KiB
Java
56 lines
1.9 KiB
Java
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/*
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* TriangleComparator.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.*;
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/**
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* A TriangleComparator is used wherever objects of type {@link Triangle} shall be inserted in a sorted set working with objects of type
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* {@link MultiSetEntry}.
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* Then, in the constructor an instance of this class is needed. It sorts the Triangle objects by calling the <tt>Triangle.compare()</tt> method.
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*/
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public class TriangleComparator 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 TriangleComparator(){}
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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}.<p>
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* Calls the <tt>compare()</tt> method for two {@link Triangle} values stored in {@link MultiSetEntry} types.<p>
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* Returns 0, if both triangles 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 <tt>int</tt>
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* @throws WrongTypeException if one of <tt>ino1.o</tt>, <tt>ino2.o</tt> is not of type <tt>Triangle</tt>
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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 Triangle) &&
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(((MultiSetEntry)ino2).value instanceof Triangle))
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return ((Triangle)((MultiSetEntry)ino1).value).compare((Triangle)((MultiSetEntry)ino2).value);
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else
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throw new WrongTypeException("in TriangleComparator: Expected Triangle - found :"+((MultiSetEntry)ino1).value.getClass()+"/"+((MultiSetEntry)ino2).value.getClass());
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}//end method compare
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}//end class TriangleComparator
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