01: /*
02: * ============================================================================
03: * GNU Lesser General Public License
04: * ============================================================================
05: *
06: * JasperReports - Free Java report-generating library.
07: * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
08: *
09: * This library is free software; you can redistribute it and/or
10: * modify it under the terms of the GNU Lesser General Public
11: * License as published by the Free Software Foundation; either
12: * version 2.1 of the License, or (at your option) any later version.
13: *
14: * This library is distributed in the hope that it will be useful,
15: * but WITHOUT ANY WARRANTY; without even the implied warranty of
16: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17: * Lesser General Public License for more details.
18: *
19: * You should have received a copy of the GNU Lesser General Public
20: * License along with this library; if not, write to the Free Software
21: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22: *
23: * JasperSoft Corporation
24: * 303 Second Street, Suite 450 North
25: * San Francisco, CA 94107
26: * http://www.jaspersoft.com
27: */
28: package net.sf.jasperreports.engine.query;
29:
30: import net.sf.jasperreports.engine.JRQueryChunk;
31:
32: /**
33: * Query clause chunk wrapper.
34: *
35: * @author Lucian Chirita (lucianc@users.sourceforge.net)
36: * @version $Id: JRClauseTokens.java 1683 2007-03-29 16:04:15Z lucianc $
37: * @see JRQueryChunk#getTokens()
38: * @see JRQueryChunk#TYPE_CLAUSE_TOKENS
39: */
40: public class JRClauseTokens {
41:
42: private final String[] tokens;
43:
44: /**
45: * Wraps an array of tokens.
46: *
47: * @param tokens the tokens
48: */
49: public JRClauseTokens(final String[] tokens) {
50: this .tokens = tokens;
51: }
52:
53: /**
54: * Returns a token at a specified position.
55: * <p>
56: * If the specified position is greater than the number of tokens or
57: * the token is empty, the method returns <code>null</code>.
58: * </p>
59: *
60: * @param position the position
61: * @return the token at the specified position
62: */
63: public String getToken(int position) {
64: String token;
65: if (tokens == null || tokens.length <= position) {
66: token = null;
67: } else {
68: token = tokens[position];
69: }
70: if (token != null) {
71: token = token.trim();
72: if (token.length() == 0) {
73: token = null;
74: }
75: }
76: return token;
77: }
78:
79: }
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