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Java > Open Source Codes > org > apache > turbine > util > parser > ParserUtils


1 package org.apache.turbine.util.parser;
2
3 /*
4  * Copyright 2001-2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License")
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19 import org.apache.commons.configuration.Configuration;
20
21 import org.apache.commons.logging.Log;
22 import org.apache.commons.logging.LogFactory;
23
24 import org.apache.commons.lang.StringUtils;
25
26 import org.apache.turbine.services.TurbineServices;
27
28 /**
29  * Static helpers for folding fields to upper or lower case
30  *
31  * @author <a HREF="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
32  * @version $Id: ParserUtils.java,v 1.2.2.2 2004/05/20 03:33:43 seade Exp $
33  */
34
35 public abstract class ParserUtils
36 {
37     /** Property for setting the URL folding value */
38     public static final String JavaDoc URL_CASE_FOLDING_KEY = "url.case.folding";
39
40     /** No folding */
41     public static final String JavaDoc URL_CASE_FOLDING_NONE_VALUE = "none";
42
43     /** Fold to lower case */
44     public static final String JavaDoc URL_CASE_FOLDING_LOWER_VALUE = "lower";
45
46     /** Fold to upper case */
47     public static final String JavaDoc URL_CASE_FOLDING_UPPER_VALUE = "upper";
48
49     /** No folding set */
50     private static final int URL_CASE_FOLDING_UNSET = 0;
51
52     /** Folding set to "no folding" */
53     public static final int URL_CASE_FOLDING_NONE = 1;
54
55     /** Folding set to "lowercase" */
56     public static final int URL_CASE_FOLDING_LOWER = 2;
57
58     /** Folding set to "uppercase" */
59     public static final int URL_CASE_FOLDING_UPPER = 3;
60
61     /** Logging */
62     private static Log log = LogFactory.getLog(ParserUtils.class);
63
64     /** The folding from the properties */
65     private static int folding = URL_CASE_FOLDING_UNSET;
66
67     /**
68      * Convert a String value according to the url.case.folding property.
69      *
70      * @param value the String to convert
71      *
72      * @return a new String.
73      *
74      */
75     public static String JavaDoc convertAndTrim(String JavaDoc value)
76     {
77         return convertAndTrim(value, getUrlFolding());
78     }
79
80     /**
81      * A static version of the convert method, which
82      * trims the string data and applies the conversion specified in
83      * the property given by URL_CASE_FOLDING. It returns a new
84      * string so that it does not destroy the value data.
85      *
86      * @param value A String to be processed.
87      * @return A new String converted to lowercase and trimmed.
88      */
89     public static String JavaDoc convertAndTrim(String JavaDoc value, int fold)
90     {
91         String JavaDoc tmp = value.trim();
92
93         switch (fold)
94         {
95         case URL_CASE_FOLDING_NONE:
96             {
97                 break;
98             }
99         case URL_CASE_FOLDING_LOWER:
100             {
101                 tmp = tmp.toLowerCase();
102                 break;
103             }
104         case URL_CASE_FOLDING_UPPER:
105             {
106                 tmp = tmp.toUpperCase();
107                 break;
108             }
109         default:
110             {
111                 log.error("Passed " + fold + " as fold rule, which is illegal!");
112                 break;
113             }
114         }
115         return tmp;
116     }
117
118     /**
119      * Gets the folding value from the properties
120      *
121      * @return The current Folding Value
122      */
123     public static int getUrlFolding()
124     {
125         if (folding == URL_CASE_FOLDING_UNSET)
126         {
127             Configuration conf = TurbineServices.getInstance().getConfiguration();
128             String JavaDoc foldString = conf.getString(URL_CASE_FOLDING_KEY,
129                                                URL_CASE_FOLDING_NONE_VALUE).toLowerCase();
130
131             folding = URL_CASE_FOLDING_NONE;
132
133             log.debug("Setting folding from " + foldString);
134             if (StringUtils.isNotEmpty(foldString))
135             {
136                 if (foldString.equals(URL_CASE_FOLDING_NONE_VALUE))
137                 {
138                     folding = URL_CASE_FOLDING_NONE;
139                 }
140                 else if (foldString.equals(URL_CASE_FOLDING_LOWER_VALUE))
141                 {
142                     folding = URL_CASE_FOLDING_LOWER;
143                 }
144                 else if (foldString.equals(URL_CASE_FOLDING_UPPER_VALUE))
145                 {
146                     folding = URL_CASE_FOLDING_UPPER;
147                 }
148                 else
149                 {
150                     log.error("Got " + foldString + " from " + URL_CASE_FOLDING_KEY + " property, which is illegal!");
151                 }
152             }
153         }
154         return folding;
155     }
156 }
157
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