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Java > Open Source Codes > org > objectstyle > cayenne > util > NameConverter


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
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13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
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22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
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34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
35  * names without prior written permission.
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37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */
56 package org.objectstyle.cayenne.util;
57
58 import java.util.StringTokenizer JavaDoc;
59
60 /**
61  * Utility class to convert from different naming styles to Java convention.
62  * For example names like "ABCD_EFG" can be converted to "abcdEfg".
63  *
64  * @author Andrei Adamchik
65  */
66 public class NameConverter {
67
68     /**
69      * Converts a String name to a String forllowing java convention for the
70      * static final variables. E.g. "abcXyz" will be converted to "ABC_XYZ".
71      *
72      * @since 1.0.3
73      */
74     public static String JavaDoc javaToUnderscored(String JavaDoc name) {
75         if (name == null) {
76             return null;
77         }
78
79         char charArray[] = name.toCharArray();
80         StringBuffer JavaDoc buffer = new StringBuffer JavaDoc();
81
82         for (int i = 0; i < charArray.length; i++) {
83             if ((Character.isUpperCase(charArray[i])) && (i != 0)) {
84                 
85                 char prevChar = charArray[i - 1];
86                 if ((Character.isLowerCase(prevChar))) {
87                     buffer.append("_");
88                 }
89             }
90
91             buffer.append(Character.toUpperCase(charArray[i]));
92         }
93
94         return buffer.toString();
95     }
96
97     /**
98      * Converts names like "ABCD_EFG_123" to Java-style names like "abcdEfg123".
99      * If <code>capitalize</code> is true, returned name is capitalized
100      * (for instance if this is a class name).
101      */
102     public static String JavaDoc undescoredToJava(String JavaDoc name, boolean capitalize) {
103         StringTokenizer JavaDoc st = new StringTokenizer JavaDoc(name, "_");
104         StringBuffer JavaDoc buf = new StringBuffer JavaDoc();
105
106         boolean first = true;
107         while (st.hasMoreTokens()) {
108             String JavaDoc token = st.nextToken();
109
110             int len = token.length();
111             if (len == 0) {
112                 continue;
113             }
114
115             // sniff mixed case vs. single case styles
116 boolean hasLowerCase = false;
117             boolean hasUpperCase = false;
118             for (int i = 0; i < len && !(hasUpperCase && hasLowerCase); i++) {
119                 if (Character.isUpperCase(token.charAt(i))) {
120                     hasUpperCase = true;
121                 } else if (Character.isLowerCase(token.charAt(i))) {
122                     hasLowerCase = true;
123                 }
124             }
125
126             // if mixed case, preserve it, if all upper, convert to lower
127 if (hasUpperCase && !hasLowerCase) {
128                 token = token.toLowerCase();
129             }
130
131             if (first) {
132                 // apply explicit capitalization rules, if this is the first token
133 first = false;
134                 if (capitalize) {
135                     buf.append(Character.toUpperCase(token.charAt(0)));
136                 } else {
137                     buf.append(Character.toLowerCase(token.charAt(0)));
138                 }
139             } else {
140                 buf.append(Character.toUpperCase(token.charAt(0)));
141             }
142
143             if (len > 1) {
144                 buf.append(token.substring(1, len));
145             }
146         }
147         return buf.toString();
148     }
149 }
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