Application: gvSIG desktop

import java.util.function.Predicate;

    private Set<FLyrVect> layersToSnap = new LayersToSnap();

    /**

     * Adds the layers to the current "layersToSnap" without 

     * replacing the current instance of "layersToSnap"

     * 

     * @param layers 

     */

    public void setLayersToSnap(Set<FLyrVect> layers) {

        this.layersToSnap.removeIf((FLyrVect t) -> !layers.contains(t));

        this.layersToSnap.addAll(layers);

/*

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 * To change this template file, choose Tools | Templates

 * and open the template in the editor.

 */

package org.gvsig.fmap.mapcontext;

import java.util.Collection;

import java.util.HashSet;

import java.util.function.Predicate;

import org.gvsig.fmap.mapcontext.layers.vectorial.FLyrVect;

/**

 *

 * @author fdiaz

 */

public class LayersToSnap extends HashSet<FLyrVect> {

    public LayersToSnap() {

    }

    @Override

    public boolean add(FLyrVect e) {

        return super.add(e); //To change body of generated methods, choose Tools | Templates.

    }

    @Override

    public boolean addAll(Collection<? extends FLyrVect> c) {

        return super.addAll(c); //To change body of generated methods, choose Tools | Templates.

    }

    @Override

    public void clear() {

        super.clear(); //To change body of generated methods, choose Tools | Templates.

    }

    @Override

    public boolean remove(Object o) {

        return super.remove(o); //To change body of generated methods, choose Tools | Templates.

    }

    @Override

    public boolean removeAll(Collection<?> c) {

        return super.removeAll(c); //To change body of generated methods, choose Tools | Templates.

    }

}