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Java/ZZConnection.java

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+/*   
+ZZConnection.java
+ *    
+ *    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 Tuukka Hastrup
+ */
+
+package org.gzigzag;
+/** A simple class defining a data type for connections in a ZZ space.
+ *  Note, that nothing says a connection represented by a ZZConnection 
+ *  object should exist. (You can test it with exists() method).
+ *  @see org.gzigzag.ZZCell#getConns()
+ */
+public class ZZConnection {
+	/** The start cell */
+	public ZZCell c1;
+	/** The dimension the connection goes along */
+	public String dim;
+	/** The direction of the connection */
+	public int dir;
+	/** The end cell */
+	public ZZCell c2;
+	public ZZConnection() {
+	}
+	/** Creates an object representing a link in ZZ space.
+	 *  @param c1	The first cell
+	 *  @param c2	The second cell
+	 *  @param dim	The dimension of the connection
+	 *  @param dir	The direction of the connection
+	 */
+	public ZZConnection(ZZCell c1, String dim, int dir, ZZCell c2) {
+		this.c1 = c1;
+		this.dim = dim;
+		this.dir = dir;
+		this.c2 = c2;
+	}
+
+	/** Tests whether this connection exists in it's space. */
+	public boolean exists() {
+		if(c1!=null && c2!=null && dim!=null && (dir==1||dir==-1)
+		   && c1.s(dim, dir)==c2)
+			return true;
+		else
+			return false;
+			
+	}
+}
+