01: //==============================================================================
02: //=== Copyright (C) 2001-2008 Food and Agriculture Organization of the
03: //=== United Nations (FAO-UN), United Nations World Food Programme (WFP)
04: //=== and United Nations Environment Programme (UNEP)
05: //===
06: //=== This program is free software; you can redistribute it and/or modify
07: //=== it under the terms of the GNU General Public License as published by
08: //=== the Free Software Foundation; either version 2 of the License, or (at
09: //=== your option) any later version.
10: //===
11: //=== This program is distributed in the hope that it will be useful, but
12: //=== WITHOUT ANY WARRANTY; without even the implied warranty of
13: //=== MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: //=== General Public License for more details.
15: //===
16: //=== You should have received a copy of the GNU General Public License
17: //=== along with this program; if not, write to the Free Software
18: //=== Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19: //===
20: //=== Contact: Jeroen Ticheler - FAO - Viale delle Terme di Caracalla 2,
21: //=== Rome - Italy. email: geonetwork@osgeo.org
22: //==============================================================================
23: package org.fao.geonet.kernel.search;
24:
25: import org.apache.lucene.search.BooleanClause;
26:
27: /**
28: * Utilities for the Lucene library.
29: */
30: public class LuceneUtils {
31:
32: /**
33: * As of Lucene 1.9, the use of <code>BooleanQuery.add(Query, boolean, boolean)</code> was deprecated
34: * and replaced by <code>BooleanQuery.add(Query, BooleanClause.Occur)</code>. This utility method
35: * converts the old pair of booleans to the corresponding <code>BooleanClause.Occur</code> value.
36: *
37: * @TODO throw exception if both booleans are true
38: *
39: * @param required
40: * @param prohibited
41: * @return BooleanClause.Occur
42: */
43: public static BooleanClause.Occur convertRequiredAndProhibitedToOccur(
44: boolean required, boolean prohibited) {
45: BooleanClause.Occur occur = null;
46: if (required && !prohibited) {
47: occur = BooleanClause.Occur.MUST;
48: } else if (!required && !prohibited) {
49: occur = BooleanClause.Occur.SHOULD;
50: } else if (!required && prohibited) {
51: occur = BooleanClause.Occur.MUST_NOT;
52: }
53: return occur;
54: }
55:
56: }
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