69 lines
2.1 KiB
Java
69 lines
2.1 KiB
Java
package org.broadinstitute.sting.utils;
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public class Pair<X,Y> {
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// declare public, STL-style for easier and more efficient access:
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public X first;
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public Y second;
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public Pair(X x, Y y) { first = x; second = y; }
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public void set(X x, Y y) { first = x; second = y; }
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/** Java-style getter; note that we currently allow direct access to
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the member field.
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*/
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public X getFirst() { return first; }
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/** Java-style getter; note that we currently allow direct access to
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the member field.
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*/
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public Y getSecond() { return second; }
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/**
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* Calculate whether this pair object is equal to another object.
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* @param o The other object (hopefully a pair).
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* @return True if the two are equal; false otherwise.
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*/
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@Override
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public boolean equals( Object o ) {
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if( o == null )
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return false;
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if( !(o instanceof Pair) )
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return false;
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Pair other = (Pair)o;
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// Check to see whether one is null but not the other.
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if( this.first == null && other.first != null ) return false;
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if( this.second == null && other.second != null ) return false;
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// Check to see whether the values are equal.
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// If the param of equals is null, it should by contract return false.
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if( this.first != null && !this.first.equals(other.first) ) return false;
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if( this.second != null && !this.second.equals(other.second) ) return false;
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return true;
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}
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/**
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* Basic hashcode function. Assume hashcodes of first and second are
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* randomly distributed and return the XOR of the two.
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* @return Randomly distributed hashcode of the pair.
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*/
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@Override
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public int hashCode() {
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if( second == null && first == null )
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return 0;
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if( second == null )
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return first.hashCode();
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if( first == null )
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return second.hashCode();
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return first.hashCode() ^ second.hashCode();
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}
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public String toString() {
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return first+","+second;
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}
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}
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