1 files changed, 97 insertions, 0 deletions
diff --git a/docs/teaching/exercises/figures/Group.java b/docs/teaching/exercises/figures/Group.java
new file mode 100644
index 000000000..ad2f224c6
--- /dev/null
+++ b/docs/teaching/exercises/figures/Group.java
@@ -0,0 +1,97 @@
+/* *******************************************************************
+ * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
+ * All rights reserved. 
+ * This program and the accompanying materials are made available 
+ * under the terms of the Common Public License v1.0 
+ * which accompanies this distribution and is available at 
+ * http://www.eclipse.org/legal/cpl-v10.html 
+ *  
+ * Contributors: 
+ *     PARC     initial implementation 
+ * ******************************************************************/
+
+
+package figures;
+
+import java.util.*;
+import java.awt.*;
+import java.awt.geom.*;
+
+public class Group implements FigureElement {
+    private Collection _members;
+    private String _identifier;
+
+    public Group(FigureElement first) {
+        this._members = new ArrayList();
+        add(first);
+    }
+
+    public void add(FigureElement fe) {
+        _members.add(fe);
+    }
+
+    public Iterator members() {
+        return _members.iterator();
+    }
+
+    public void move(int dx, int dy) {
+        for (Iterator i = _members.iterator(); i.hasNext(); ) {
+            FigureElement fe = (FigureElement)i.next();
+            fe.move(dx, dy);
+        }
+    }
+
+    public void setIdentifier(String identifier) {
+        _identifier = identifier;
+    }
+
+    public String toString() {
+        if (_identifier != null) {
+            return _identifier;
+        }
+
+        StringBuffer buf = new StringBuffer("Group(");
+        for (Iterator i = _members.iterator(); i.hasNext(); ) {
+            buf.append(i.next().toString());
+            if (i.hasNext()) {
+                buf.append(", ");
+            }
+        }
+        buf.append(")");
+        return buf.toString();
+    }
+
+    public Rectangle getBounds() {
+        Rectangle previous = null;
+        for (Iterator i = _members.iterator(); i.hasNext(); ) {
+            FigureElement fe = (FigureElement)i.next();
+            Rectangle rect = fe.getBounds();
+            if (previous != null) {
+                previous = previous.union(rect);
+            } else {
+                previous = rect;
+            }
+        }
+        return previous;
+    }
+
+    public boolean contains(Point2D p) {
+        for (Iterator i = _members.iterator(); i.hasNext(); ) {
+            FigureElement fe = (FigureElement)i.next();
+            if (fe.contains(p)) return true;
+        }
+        return false;
+    }
+
+    public void paint(Graphics2D g2) {
+        for (Iterator i = _members.iterator(); i.hasNext(); ) {
+            FigureElement fe = (FigureElement)i.next();
+            fe.paint(g2);
+        }
+    }
+
+    public int size() {
+        return _members.size();
+    }
+}
+