96 lines
2.5 KiB
Java
96 lines
2.5 KiB
Java
/*
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Address.java
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*
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* Copyright (c) 1999, Ted Nelson and Tuomas Lukka
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*
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* You may use and distribute under the terms of either the GNU Lesser
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* General Public License, either version 2 of the license or,
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* at your choice, any later version. Alternatively, you may use and
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* distribute under the terms of the XPL.
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*
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* See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of
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* the licenses.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the README
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* file for more details.
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*
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*/
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/*
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* Written by Tuomas Lukka
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*/
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package org.gzigzag;
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import java.util.*;
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/** An address in a stable media stream.
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* Currently just a silly pointer but will be later extended
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* to include full tumblers.
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* Format: streamid.offset, where streamid is an alphanumeric string
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* identifying a stream.
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*/
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public class Address {
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public static final String rcsid = "$Id: Address.java,v 1.3 2000/09/19 10:32:00 ajk Exp $";
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public static final boolean dbg = false;
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static final void p(String s) { if(dbg) System.out.println(s); }
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Scroll scroll;
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String stream;
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long offset;
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public static Address parse(String s) {
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StringTokenizer st = new StringTokenizer(s, ".");
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if(st.countTokens() != 2) {
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throw new ZZError("Wrong number of toks in '"+s+"'");
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}
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Address a = new Address();
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a.stream = st.nextToken();
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a.offset = Long.parseLong(st.nextToken());
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return a;
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}
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public static Address streamOffs(String s, long offs) {
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Address a = new Address();
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a.stream = s;
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a.offset = offs;
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return a;
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}
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public static Address scrollOffs(Scroll s, long offs) {
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// return s.getId() + "." + offs;
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Address a = new Address();
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a.stream = s.getId();
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a.offset = offs;
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return a;
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}
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public String getStream() { return stream; }
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public Scroll getScroll(ZZSpace s) {
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if(scroll==null) scroll = Scroll.obtain(s, stream);
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return scroll;
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}
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public long getOffs() { return offset; }
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public String toString() {
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return stream.toString() + "." + offset;
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}
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public boolean lessThan(Address a) {
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int c = stream.compareTo(a.stream);
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if(c < 0) return true;
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if(c > 0) return false;
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if(offset < a.offset) return true;
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return false;
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}
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public Address addOffs(int o) {
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Address a = new Address();
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a.scroll = scroll;
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a.stream = stream;
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a.offset = offset + o;
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return a;
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}
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}
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