01: package it.unimi.dsi.mg4j.search.visitor;
02:
03: /*
04: * MG4J: Managing Gigabytes for Java
05: *
06: * Copyright (C) 2006-2007 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.mg4j.search.DocumentIterator;
25:
26: /** An abstract implementation of a {@link it.unimi.dsi.mg4j.search.visitor.DocumentIteratorVisitor}
27: * that does nothing and always returns true when visiting internal nodes.
28: */
29:
30: public abstract class AbstractDocumentIteratorVisitor implements
31: DocumentIteratorVisitor {
32: public DocumentIteratorVisitor prepare() {
33: return this ;
34: }
35:
36: public boolean visitPre(final DocumentIterator documentIterator) {
37: return true;
38: }
39:
40: public boolean visitPost(final DocumentIterator documentIterator) {
41: return true;
42: }
43: }
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