| JGL - The Generic Collection Library for Java |
| JGL - The Generic Collection Library for Java |
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Filtering1 - Collapsing consecutive elements in a native array of Objects and an JGL container.
Filtering2 - Selecting and rejecting elements from a container
Filtering1 Example Code
// Copyright(c) 1996,1997 ObjectSpace, Inc.
import com.objectspace.jgl.*;
import com.objectspace.jgl.adapters.*;
import com.objectspace.jgl.algorithms.*;
import com.objectspace.jgl.util.*;
/**
* Collapsing consecutive elements in a native array of Objects and an JGL container.
*
* @see com.objectspace.jgl.algorithms.Filtering
* @version 3.0.0
* @author ObjectSpace, Inc.
*/
public class Filtering1
{
public static void main( String[] args )
{
String[] strings = { "gnu", "emu", "emu", "fox", "fox", "fox", "gnu" };
ObjectIterator begin = ObjectIterator.begin( strings );
ObjectIterator end = ObjectIterator.end( strings );
System.out.print( "strings = " );
Printing.println( begin, end );
ObjectIterator last = (ObjectIterator)Filtering.unique( begin, end );
System.out.print( "filtered strings = " );
Printing.println( begin, end );
int remaining = begin.distance( last );
System.out.println( "remaining = " + remaining );
System.out.print( "filtered array with bounds given = " );
end.retreat( remaining );
Printing.println( begin, end );
Array array = new Array();
array.add( "gnu" );
array.add( "emu" );
array.add( "emu" );
array.add( "fox" );
array.add( "fox" );
array.add( "fox" );
array.add( "gnu" );
System.out.println( "array = " + array );
Deque deque = new Deque();
Filtering.uniqueCopy( array, new InsertIterator( deque ) );
System.out.println( "deque = " + deque );
}
}
strings = ( gnu, emu, emu, fox, fox, fox, gnu )
filtered strings = ( gnu, emu, fox, gnu, fox, fox, gnu )
remaining = 4
filtered array with bounds given = ( gnu, emu, fox )
array = Array( gnu, emu, emu, fox, fox, fox, gnu )
deque = Deque( gnu, emu, fox, gnu )
Filtering2 Example Code
// Copyright(c) 1996,1997 ObjectSpace, Inc.
import com.objectspace.jgl.*;
import com.objectspace.jgl.algorithms.*;
/**
* Selecting and rejecting elements from a container
*
* @see com.objectspace.jgl.algorithms.Filtering
* @version 3.0.0
* @author ObjectSpace, Inc.
*/
public class Filtering2
{
public static void main( String[] args )
{
HashSet set = new HashSet( true ); // allow duplicates
set.add( "dog" );
set.add( "monkey" );
set.add( "lion" );
set.add( "dog" );
set.add( "armadillo" );
set.add( "zebra" );
System.out.println( "Original set: " + set + "\n" );
System.out.println
(
"Collecting strings > 5 chars: " + Filtering.select
(
set,
new Filtering2UnaryPredicate()
)
);
System.out.println
(
" Rejecting strings > 5 chars: " + Filtering.reject
(
set,
new Filtering2UnaryPredicate()
)
);
}
}
class Filtering2UnaryPredicate implements UnaryPredicate
{
// return true if the length of the toString() is
// greater than 5.
public boolean execute( Object object )
{
return object.toString().length() > 5;
}
}
Original set: HashSet( dog, dog, armadillo, monkey, zebra, lion )
Collecting strings > 5 chars: HashSet( armadillo, monkey )
Rejecting strings > 5 chars: HashSet( dog, dog, zebra, lion )
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