[josm-dev] [PATCH 16/24] ConditionalDeleteCommand

[Dave Hansen]

A cleanup class.  It lets us have some objects examine themselves
to see if they are able to be deleted, like when a Way has no nodes
left.

---

 core-dave/src/org/openstreetmap/josm/command/ConditionalDeleteCommand.java |   84 ++++++++++
 1 file changed, 84 insertions(+)

diff -puN /dev/null src/org/openstreetmap/josm/command/ConditionalDeleteCommand.java
--- /dev/null	2008-02-29 08:37:01.000000000 -0800
+++ core-dave/src/org/openstreetmap/josm/command/ConditionalDeleteCommand.java	2008-05-03 12:08:43.000000000 -0700
@@ -0,0 +1,84 @@
+// License: GPL. Copyright 2007 by Immanuel Scholz and others
+package org.openstreetmap.josm.command;
+
+import static org.openstreetmap.josm.tools.I18n.tr;
+import static org.openstreetmap.josm.tools.I18n.trn;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+import javax.swing.JLabel;
+import javax.swing.tree.DefaultMutableTreeNode;
+import javax.swing.tree.MutableTreeNode;
+
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.visitor.NameVisitor;
+import org.openstreetmap.josm.tools.ImageProvider;
+
+/**
+ * A command to delete a primitive from the dataset, but only if it
+ * is "ready" to go, such as a Way with no nodes in it.
+ *
+ * @author daveh
+ */
+public class ConditionalDeleteCommand extends Command {
+
+	/**
+	 * The primitive that get deleted.
+	 */
+	private final Collection<? extends OsmPrimitive> data;
+	private final Collection<OsmPrimitive> deleted_data;
+
+	public ConditionalDeleteCommand(Collection<? extends OsmPrimitive> data) {
+		this.data = data;
+		deleted_data = new ArrayList<OsmPrimitive>();
+	}
+
+	@Override public boolean executeCommand() {
+		super.executeCommand();
+		for (OsmPrimitive osm : data) {
+			if (!osm.mayDelete())
+				continue;
+			osm.delete(true);
+			deleted_data.add(osm);
+		}
+		return true;
+	}
+
+	@Override public void undoCommand() {
+		super.executeCommand();
+		for (OsmPrimitive osm : deleted_data) {
+			osm.delete(false);
+		}
+		deleted_data.clear();
+	}
+
+	@Override public MutableTreeNode description() {
+		NameVisitor v = new NameVisitor();
+
+		if (data.size() == 1) {
+			data.iterator().next().visit(v);
+			return new DefaultMutableTreeNode(new JLabel(tr("Conditional Delete")+" "+tr(v.className)+" "+v.name, v.icon, JLabel.HORIZONTAL));
+		}
+
+		String cname = null;
+		for (OsmPrimitive osm : data) {
+			osm.visit(v);
+			if (cname == null)
+				cname = v.className;
+			else if (!cname.equals(v.className))
+				cname = "object";
+		}
+		DefaultMutableTreeNode root = new DefaultMutableTreeNode(new JLabel(
+				tr("Delete")+" "+data.size()+" "+trn(cname, cname+"s", data.size()), ImageProvider.get("data", cname), JLabel.HORIZONTAL));
+		for (OsmPrimitive osm : data) {
+			osm.visit(v);
+			root.add(new DefaultMutableTreeNode(v.toLabel()));
+		}
+		return root;
+	}
+
+	@Override public void fillModifiedData(Collection<OsmPrimitive> modified, Collection<OsmPrimitive> deleted, Collection<OsmPrimitive> added) {
+
+    }
+}
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