01: package it.unimi.dsi.mg4j.index;
02:
03: /*
04: * MG4J: Managing Gigabytes for Java
05: *
06: * Copyright (C) 2005-2007 Sebastiano Vigna
07: *
08: * This library is free software; you can redistribute it and/or modify it
09: * under the terms of the GNU Lesser General Public License as published by the Free
10: * Software Foundation; either version 2.1 of the License, or (at your option)
11: * any later version.
12: *
13: * This library is distributed in the hope that it will be useful, but
14: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
16: * for more details.
17: *
18: * You should have received a copy of the GNU Lesser General Public License
19: * along with this program; if not, write to the Free Software
20: * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21: *
22: */
23:
24: import it.unimi.dsi.lang.MutableString;
25:
26: /** A term processor that accepts all terms and does not do any processing. */
27:
28: public class NullTermProcessor implements TermProcessor {
29: private static final long serialVersionUID = 1L;
30:
31: private final static NullTermProcessor INSTANCE = new NullTermProcessor();
32:
33: private NullTermProcessor() {
34: }
35:
36: public final static TermProcessor getInstance() {
37: return INSTANCE;
38: }
39:
40: public boolean processTerm(final MutableString term) {
41: return term != null;
42: }
43:
44: public boolean processPrefix(final MutableString prefix) {
45: return processTerm(prefix);
46: }
47:
48: private Object readResolve() {
49: return INSTANCE;
50: }
51:
52: public String toString() {
53: return this .getClass().getName();
54: }
55:
56: public NullTermProcessor copy() {
57: return this;
58: }
59: }
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