01: /*
02: * $Id: BaseRegExpFunction.java,v 1.2 2005/06/18 01:03:45 ahimanikya Exp $
03: * =======================================================================
04: * Copyright (c) 2005 Axion Development Team. All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: *
10: * 1. Redistributions of source code must retain the above
11: * copyright notice, this list of conditions and the following
12: * disclaimer.
13: *
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in
16: * the documentation and/or other materials provided with the
17: * distribution.
18: *
19: * 3. The names "Tigris", "Axion", nor the names of its contributors may
20: * not be used to endorse or promote products derived from this
21: * software without specific prior written permission.
22: *
23: * 4. Products derived from this software may not be called "Axion", nor
24: * may "Tigris" or "Axion" appear in their names without specific prior
25: * written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
30: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
32: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
33: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
37: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38: * =======================================================================
39: */
40:
41: package org.axiondb.functions;
42:
43: import java.util.HashMap;
44: import java.util.Map;
45: import java.util.regex.Pattern;
46: import java.util.regex.PatternSyntaxException;
47:
48: import org.axiondb.AxionException;
49:
50: /**
51: * @version $Revision: 1.2 $ $Date: 2005/06/18 01:03:45 $
52: * @author Ahimanikya Satapathy
53: * @author Jonathan Giron
54: */
55: public abstract class BaseRegExpFunction extends BaseFunction implements
56: ScalarFunction {
57: public BaseRegExpFunction(String name) {
58: super (name);
59: _reCache = new HashMap();
60: }
61:
62: protected Object getFromCache(Object key) {
63: return _reCache.get(key);
64: }
65:
66: protected void putInCache(Object key, Object value) {
67: _reCache.put(key, value);
68: }
69:
70: protected Pattern compile(String pattern) throws AxionException {
71: Pattern regexp = (Pattern) getFromCache(pattern);
72:
73: if (regexp == null) {
74: try {
75: regexp = Pattern.compile(pattern);
76: putInCache(pattern, regexp);
77: } catch (PatternSyntaxException e) {
78: if (e.getMessage() != null) {
79: throw new AxionException(e, 2220102);
80: }
81:
82: throw new AxionException(2220102);
83: }
84: }
85:
86: return regexp;
87: }
88:
89: private Map _reCache = null;
90: }
|