01: package org.ofbiz.rules.parse.tokens;
02:
03: import java.util.*;
04:
05: /**
06: * <p><b>Title:</b> Lower Case Word
07: * <p><b>Description:</b> None
08: * <p>Copyright (c) 1999 Steven J. Metsker.
09: * <p>Copyright (c) 2001 The Open For Business Project - www.ofbiz.org
10: *
11: * <p>Permission is hereby granted, free of charge, to any person obtaining a
12: * copy of this software and associated documentation files (the "Software"),
13: * to deal in the Software without restriction, including without limitation
14: * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15: * and/or sell copies of the Software, and to permit persons to whom the
16: * Software is furnished to do so, subject to the following conditions:
17: *
18: * <p>The above copyright notice and this permission notice shall be included
19: * in all copies or substantial portions of the Software.
20: *
21: * <p>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22: * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
24: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
25: * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
26: * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
27: * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28: *
29: * <br>
30: * This class shows the how to introduce a new type of
31: * terminal, specifically for recognizing lowercase words.
32: *
33: * @author Steven J. Metsker
34: * @version 1.0
35: */
36: public class LowercaseWord extends Word {
37:
38: /**
39: * Returns true if an assembly's next element is a
40: * lower case word.
41: *
42: * @param object an element from a assembly
43: *
44: * @return true, if an assembly's next element is a
45: * lowercase word
46: */
47: protected boolean qualifies(Object o) {
48: Token t = (Token) o;
49:
50: if (!t.isWord()) {
51: return false;
52: }
53: String word = t.sval();
54:
55: return word.length() > 0
56: && Character.isLowerCase(word.charAt(0));
57: }
58:
59: /**
60: *
61: */
62: public List randomExpansion(int maxDepth, int depth) {
63: int n = (int) (5.0 * Math.random()) + 3;
64:
65: char[] letters = new char[n];
66:
67: for (int i = 0; i < n; i++) {
68: int c = (int) (26.0 * Math.random()) + 'a';
69:
70: letters[i] = (char) c;
71: }
72:
73: List v = new ArrayList();
74:
75: v.add(new String(letters));
76: return v;
77: }
78:
79: /**
80: * Returns a textual description of this production.
81: *
82: * @param vector a list of productions already printed in this
83: * description
84: *
85: * @return string a textual description of this production
86: *
87: * @see ProductionRule#toString()
88: */
89: public String unvisitedString(List visited) {
90: return "word";
91: }
92: }
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