1 /* ============================================================
2 * JRobin : Pure java implementation of RRDTool's functionality
3 * ============================================================
4 *
5 * Project Info: http://www.jrobin.org
6 * Project Lead: Sasa Markovic (saxon@jrobin.org);
7 *
8 * (C) Copyright 2003-2005, by Sasa Markovic.
9 *
10 * This library is free software; you can redistribute it and/or modify it under the terms
11 * of the GNU Lesser General Public License as published by the Free Software Foundation;
12 * either version 2.1 of the License, or (at your option) any later version.
13 *
14 * Developers: Sasa Markovic (saxon@jrobin.org)
15 *
16 *
17 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
18 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 * See the GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public License along with this
22 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
23 * Boston, MA 02111-1307, USA.
24 */
25
26 package org.jrobin.core;
27
28 import java.io.IOException;
29
30 class RrdString extends RrdPrimitive {
31 private String cache;
32
33 RrdString(RrdUpdater updater, boolean isConstant) throws IOException {
34 super(updater, RrdPrimitive.RRD_STRING, isConstant);
35 }
36
37 RrdString(RrdUpdater updater) throws IOException {
38 this(updater, false);
39 }
40
41 void set(String value) throws IOException {
42 if (!isCachingAllowed()) {
43 writeString(value);
44 }
45 // caching allowed
46 else if (cache == null || !cache.equals(value)) {
47 // update cache
48 writeString(cache = value);
49 }
50 }
51
52 String get() throws IOException {
53 return (cache != null) ? cache : readString();
54 }
55 }
56