source: osm/applications/editors/josm/plugins/reltoolbox/src/relcontext/actions/SelectMembersAction.java

// License: GPL. For details, see LICENSE file.
package relcontext.actions;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.event.ActionEvent;
import java.util.Collections;

import javax.swing.AbstractAction;

import org.openstreetmap.josm.data.osm.Relation;
import org.openstreetmap.josm.gui.MainApplication;
import org.openstreetmap.josm.tools.ImageProvider;

import relcontext.ChosenRelation;
import relcontext.ChosenRelationListener;

public class SelectMembersAction extends AbstractAction implements ChosenRelationListener {
    private final ChosenRelation rel;

    public SelectMembersAction(ChosenRelation rel) {
        super(tr("Select members"));
        putValue(SMALL_ICON, ImageProvider.get("selectall"));
        this.rel = rel;
        rel.addChosenRelationListener(this);
        setEnabled(rel.get() != null);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        MainApplication.getLayerManager().getEditLayer().data.setSelected(
                rel.get() == null ? Collections.emptyList() : rel.get().getMemberPrimitives());
    }

    @Override
    public void chosenRelationChanged(Relation oldRelation, Relation newRelation) {
        setEnabled(newRelation != null);
    }
}