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Java/ZZLocalDimension.java

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+/*   
+ZZLocalDimension.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.*;
+
+/** Dimension-centric implementation of a locally 
+ * stored dimension. 
+ */
+public class ZZLocalDimension extends ZZDimension {
+public static final String rcsid = "$Id: ZZLocalDimension.java,v 1.14 2000/11/30 08:44:32 ajk Exp $";
+	public static final boolean dbg = true;
+        final static void p(String s) { if(dbg) ZZLogger.log(s); }
+        final static void pa(String s) { ZZLogger.log(s); }
+
+	/** Connections to the positive direction. */
+	Hashtable cp = new Hashtable();
+	/** Connections to the negative direction. */
+	Hashtable cm = new Hashtable();
+
+	public ZZCellHandle s(ZZCellHandle c, int steps, ZZObs o) {
+		String s = c.id;
+		if(o != null) triggers.addObs(s, o);
+		if(steps>0)
+			while(steps-- > 0 && s != null) {
+			    s = (String)cp.get(s);
+			    if(o != null) triggers.addObs(s, o);
+			}
+		else
+			while(steps++ < 0 && s != null) {
+			    s = (String)cm.get(s);
+			    if(o != null) triggers.addObs(s, o);
+			}
+
+		if(s==null) return null;
+		return (ZZCellHandle)space.getCellByID(s);
+	}
+	public void connect(ZZCellHandle c, ZZCellHandle d) {
+		disconnect(c, 1);
+		disconnect(d, -1);
+		/* XXX: This is from 0.3 branch, don't know if this
+		  should be chosen instead of the above 
+	    if(cp.get(c.id) != null ||
+	       cm.get(d.id) != null)
+		    throw new ZZConnectWouldBreakError("localdim");
+		*/
+		cp.put(c.id, d.id);
+		cm.put(d.id, c.id);
+		triggers.chg(c.id);
+		triggers.chg(d.id);
+	}
+	public void disconnect(ZZCellHandle c, int dir) {
+		String o;
+		if(dir>0) {
+			o = (String)cp.get(c.id);
+			if(o!=null) {
+				cp.remove(c.id);
+				cm.remove(o);
+			}
+		} else {
+			o = (String)cm.get(c.id);
+			if(o!=null) {
+				cm.remove(c.id);
+				cp.remove(o);
+			}
+		}
+		triggers.chg(c.id);
+	}
+
+}