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Java/media/Address.java

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+/*   
+Address.java
+ *    
+ *    Copyright (c) 1999, 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.*;
+
+/** An address in a stable media stream.
+ * Currently just a silly pointer but will be later extended
+ * to include full tumblers.
+ * Format: streamid.offset, where streamid is an alphanumeric string
+ * identifying a stream.
+ */
+
+public class Address {
+public static final String rcsid = "$Id: Address.java,v 1.3 2000/09/19 10:32:00 ajk Exp $";
+	public static final boolean dbg = false;
+	static final void p(String s) { if(dbg) System.out.println(s); }
+
+	Scroll scroll;
+	String stream;
+	long offset;
+	public static Address parse(String s) {
+		StringTokenizer st = new StringTokenizer(s, ".");
+		if(st.countTokens() != 2) {
+			throw new ZZError("Wrong number of toks in '"+s+"'");
+		}
+		Address a = new Address();
+		a.stream = st.nextToken();
+		a.offset = Long.parseLong(st.nextToken());
+		return a;
+	}
+
+	public static Address streamOffs(String s, long offs) {
+		Address a = new Address();
+		a.stream = s;
+		a.offset = offs;
+		return a;
+	}
+	public static Address scrollOffs(Scroll s, long offs) {
+		// return s.getId() + "." + offs;
+		Address a = new Address();
+		a.stream = s.getId();
+		a.offset = offs;
+		return a;
+	}
+
+	public String getStream() { return stream; }
+	public Scroll getScroll(ZZSpace s) { 
+		if(scroll==null) scroll = Scroll.obtain(s, stream);
+		return scroll;
+	}
+	public long getOffs() { return offset; }
+
+	public String toString() {
+		return stream.toString() + "." + offset;
+	}
+
+	public boolean lessThan(Address a) {
+	    int c = stream.compareTo(a.stream);
+	    if(c < 0) return true; 
+	    if(c > 0) return false;
+	    if(offset < a.offset) return true;
+	    return false;
+	}
+
+	public Address addOffs(int o) {
+	    Address a = new Address();
+	    a.scroll = scroll;
+	    a.stream = stream;
+	    a.offset = offset + o;
+	    return a;
+	}
+
+}
+