Set Example 2 : Collection « Apache Common « Java





Set Example 2

import org.apache.commons.collections.collection.*;
import org.apache.commons.collections.set.*;

import java.util.Set;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Collection;

public class SetExampleV2 {
  public static void main(String args[]) {
    // create two sets
    Set set1 = new HashSet();
    set1.add("Red");
    set1.add("Green");

    Set set2 = new HashSet();
    set2.add("Yellow");
    set2.add("Red");

    // create a composite set out of these two
    CompositeSet composite = new CompositeSet();

    // set the class that handles additions, conflicts etc
    // composite.setMutator(new CompositeMutator());

    // initialize the composite with the sets
    // Cannot be used if set1 and set2 intersect is not null and
    // a strategy to deal with it has not been set
    composite.addComposited(new Set[] {set1, set2});

    // do some addition/deletions
    // composite.add("Pink");
    // composite.remove("Green");

    // whats left in the composite?
    Iterator itr = composite.iterator();

    while(itr.hasNext()) {
      System.err.println(itr.next());
    }
  }
}

class CompositeMutator implements CompositeSet.SetMutator {

  public void resolveCollision(
    CompositeSet comp,
    Set existing,
    Set added,
    Collection intersection) {

    added.removeAll(intersection);
  }
  public boolean add(
    CompositeCollection collection,
    Collection[] collections,
    Object obj) {

    return collections[0].add(obj);
  }

  public boolean remove(
    CompositeCollection collection,
    Collection[] collections,
    Object obj) {

    return collections[0].remove(obj);
  }

  public boolean addAll(
    CompositeCollection collection,
    Collection[] collections,
    Collection coll) {

    return collections[0].addAll(coll);
  }

}
           
       










ApacheCommonSetExampleV2.zip( 514 k)

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