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Java/ZZRODimension.java

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+/*   
+ZZRODimension.java
+ *    
+ *    Copyright (c) 2000, Ted Nelson and Tuomas Lukka
+ *
+ *    You may use and distribute under the terms of either the GNU Lesser
+ *    General Public License, either version 2 of the license or,
+ *    at your choice, any later version. Alternatively, you may use and
+ *    distribute under the terms of the XPL.
+ *
+ *    See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of 
+ *    the licenses.
+ *
+ *    This software is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the README
+ *    file for more details.
+ *
+ */
+/*
+ * Written by Tuomas Lukka
+ */
+package org.gzigzag;
+import java.util.*;
+
+/** A read-only dimension.
+ * This class simply extends ZZDimension by implementing the
+ * abstract methods that would modify the dimension by code that
+ * simply throws an exception.
+ * The only method that subclasses will need to override is s.
+ */
+
+public abstract class ZZRODimension extends ZZDimension {
+public static final String rcsid = "$Id: ZZRODimension.java,v 1.10 2000/11/05 19:11:13 tjl Exp $";
+	public abstract ZZCellHandle s(ZZCellHandle c, int steps, ZZObs o); 
+	public void connect(ZZCellHandle c, ZZCellHandle d) {
+		throw new ZZError("Read-only dimension"); 
+	}
+	public void disconnect(ZZCellHandle c, int dir) {
+		throw new ZZError("Read-only dimension"); 
+	}
+	public void excise(ZZCellHandle c) {
+	    // Do nothing.
+	}
+}