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// This Source Code is in the Public Domain per: http://litesoft.org/License.txt
package org.litesoft.core.util;
@SuppressWarnings({"unchecked"})
public class Compare
{
private int mResult;
protected Compare( int pResult )
{
mResult = pResult;
}
public final int result()
{
return mResult;
}
private static final Compare NEGATIVE = new Compare( -1 );
private static final Compare POSITIVE = new Compare( 1 );
private static final Compare ZERO = new Compare( 0 )
{
private Compare vector( int pCompareTo )
{
return (pCompareTo == 0) ? this : (pCompareTo < 0) ? NEGATIVE : POSITIVE;
}
@Override
public Compare then( Comparable pA, Comparable pB )
{
if ( pA == pB ) // same or both null
{
return this;
}
// noinspection unchecked
return vector( (pA != null) ? pA.compareTo( pB ) : -(pB.compareTo( pA )) );
}
@Override
public Compare thenNullsOK( Comparable pA, Comparable pB )
{
if ( pA == pB ) // same or both null
{
return this;
}
return (pA == null) ? NEGATIVE : (pB == null) ? POSITIVE : vector( pA.compareTo( pB ) );
}
@Override
public Compare then( boolean pA, boolean pB )
{
return (pA == pB) ? this : then( (pA ? 1 : 0), (pB ? 1 : 0) );
}
@Override
public Compare then( int pA, int pB )
{
return vector( pA - pB );
}
};
public static Compare first( Comparable pA, Comparable pB )
{
return ZERO.then( pA, pB );
}
public Compare then( Comparable pA, Comparable pB )
{
return this;
}
/**
* Nulls Rise
*/
public static Compare firstNullsOK( Comparable pA, Comparable pB )
{
return ZERO.thenNullsOK( pA, pB );
}
/**
* Nulls Rise
*/
public Compare thenNullsOK( Comparable pA, Comparable pB )
{
return this;
}
public static Compare first( boolean pA, boolean pB )
{
return ZERO.then( pA, pB );
}
public Compare then( boolean pA, boolean pB )
{
return this;
}
public static Compare first( int pA, int pB )
{
return ZERO.then( pA, pB );
}
public Compare then( int pA, int pB )
{
return this;
}
}
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