source: josm/trunk/src/org/openstreetmap/josm/actions/PasteAction.java@ 729

// License: GPL. Copyright 2007 by Immanuel Scholz and others
// Author: David Earl
package org.openstreetmap.josm.actions;

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

import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.command.AddCommand;
import org.openstreetmap.josm.command.Command;
import org.openstreetmap.josm.command.SequenceCommand;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.data.osm.Relation;
import org.openstreetmap.josm.data.osm.Node;
import org.openstreetmap.josm.data.osm.OsmPrimitive;
import org.openstreetmap.josm.data.osm.RelationMember;
import org.openstreetmap.josm.data.osm.Way;
import org.openstreetmap.josm.data.coor.EastNorth;

public final class PasteAction extends JosmAction {

    public PasteAction() {
        super(tr("Paste"), "paste",
                        tr("Paste contents of paste buffer."),
                        KeyEvent.VK_V, KeyEvent.CTRL_MASK, true);
                setEnabled(false);
    }

        public void actionPerformed(ActionEvent e) {
                DataSet pasteBuffer = Main.pasteBuffer;

                /* Find the middle of the pasteBuffer area */ 
                EastNorth centre = Main.map.mapView.getCenter();
                double maxEast = -1E100, minEast = 1E100, maxNorth = -1E100, minNorth = 1E100;
                for (Node n : pasteBuffer.nodes) {
                        double east = n.eastNorth.east();
                        double north = n.eastNorth.north();
                        if (east > maxEast) { maxEast = east; } 
                        if (east < minEast) { minEast = east; } 
                        if (north > maxNorth) { maxNorth = north; } 
                        if (north < minNorth) { minNorth = north; } 
                }
                double offsetEast = centre.east() - (maxEast + minEast)/2.0;
                double offsetNorth = centre.north() - (maxNorth + minNorth)/2.0; 
                
                HashMap<OsmPrimitive,OsmPrimitive> map = new HashMap<OsmPrimitive,OsmPrimitive>(); 
                  /* temporarily maps old nodes to new so we can do a true deep copy */
                
                /* do the deep copy of the paste buffer contents, leaving the pasteBuffer unchanged */
                for (Node n : pasteBuffer.nodes) {
                        Node nnew = new Node(n);
                        nnew.id = 0;
                        /* adjust the coordinates to the middle of the visible map area */
                        nnew.eastNorth = new EastNorth(nnew.eastNorth.east() + offsetEast, nnew.eastNorth.north() + offsetNorth);
                        nnew.coor = Main.proj.eastNorth2latlon(nnew.eastNorth);
                        map.put(n, nnew);
                }
                for (Way w : pasteBuffer.ways) {
                        Way wnew = new Way();
                        wnew.cloneFrom(w);
                        wnew.id = 0;
                        /* make sure we reference the new nodes corresponding to the old ones */
                        List<Node> nodes = new ArrayList<Node>();
                        for (Node n : w.nodes) {
                                nodes.add((Node)map.get(n));
                        }
                        wnew.nodes.clear();
                        wnew.nodes.addAll(nodes);
                        map.put(w, wnew);
                }
                for (Relation r : pasteBuffer.relations) {
                        Relation rnew = new Relation(r);
                        rnew.id = 0;
                        List<RelationMember> members = new ArrayList<RelationMember>();
                        for (RelationMember m : r.members) {
                                RelationMember mnew = new RelationMember(m);
                                mnew.member = map.get(m.member);
                                members.add(mnew);
                        }
                        rnew.members.clear();
                        rnew.members.addAll(members);
                        map.put(r, rnew);
                }
                
                /* Now execute the commands to add the dupicated contents of the paste buffer to the map */
                Collection<OsmPrimitive> osms = map.values();
                Collection<Command> clist = new LinkedList<Command>();
                for (OsmPrimitive osm : osms) {
                        clist.add(new AddCommand(osm));
                }

                Main.main.undoRedo.add(new SequenceCommand(tr("Paste"), clist));
                Main.ds.setSelected(osms);
                Main.map.mapView.repaint();
    }
}