Source Code Cross Referenced for InterWikiHandler.java in  » Wiki-Engine » JAMWiki » org » jamwiki » utils » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Wiki Engine » JAMWiki » org.jamwiki.utils 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /**
02:         * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE, version 2.1, dated February 1999.
03:         *
04:         * This program is free software; you can redistribute it and/or modify
05:         * it under the terms of the latest version of the GNU Lesser General
06:         * Public License as published by the Free Software Foundation;
07:         *
08:         * This program is distributed in the hope that it will be useful,
09:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
10:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11:         * GNU Lesser General Public License for more details.
12:         *
13:         * You should have received a copy of the GNU Lesser General Public License
14:         * along with this program (LICENSE.txt); if not, write to the Free Software
15:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
16:         */package org.jamwiki.utils;
17:
18:        import java.text.MessageFormat;
19:        import java.util.Properties;
20:        import org.jamwiki.Environment;
21:
22:        /**
23:         * Class for controlling inter-wiki links. An interwiki link is a link that is
24:         * specified using a namespace that is then resolved into an external link, such
25:         * as "Wikipedia:Main Page", which would resolve to
26:         * "http://en.wikipedia.org/wiki/Main_Page".  The mappings of namespace values to
27:         * URL patterns are persisted in WEB-INF/classes/interwiki.properties.
28:         */
29:        public class InterWikiHandler {
30:
31:            /** Logger */
32:            private static final WikiLogger logger = WikiLogger
33:                    .getLogger(InterWikiHandler.class.getName());
34:            /** Properties bundle to store mappings */
35:            private static Properties mapping;
36:            /** Name of resource to access the persisted bundle */
37:            private static final String RESOURCE_NAME = "/interwiki.properties";
38:
39:            static {
40:                InterWikiHandler.mapping = Environment
41:                        .loadProperties(RESOURCE_NAME);
42:            }
43:
44:            /**
45:             *
46:             */
47:            private InterWikiHandler() {
48:            }
49:
50:            /**
51:             * Retrieve an inter-wiki mapping for the given namespace and use the value
52:             * parameter to create a URL to that wiki.  For example, a namespace of
53:             * "wikipedia" and a value of "Main Page" will resolve to a the URL
54:             * "http://en.wikipedia.org/wiki/Main_Page".
55:             *
56:             * @param namespace The inter-wiki link namespace corresponding to the key
57:             *  value in the interwiki.properties file.  This link is compared in a
58:             *  case-insensitive manner.
59:             * @param value The page or topic name that is being linked to.
60:             * @return Returns a formatted URL that links to the page specified by the
61:             *  namespace and value.  If no namespace mapping is present then a string
62:             *  that combines the namespace and value is returned, such as
63:             *  "namespace:value".
64:             */
65:            public static String formatInterWiki(String namespace, String value) {
66:                String pattern = InterWikiHandler.mapping.getProperty(namespace
67:                        .toLowerCase());
68:                if (pattern == null) {
69:                    return namespace + NamespaceHandler.NAMESPACE_SEPARATOR
70:                            + value;
71:                }
72:                try {
73:                    Object[] objects = { Utilities.encodeForURL(value) };
74:                    return MessageFormat.format(pattern, objects);
75:                } catch (Exception e) {
76:                    logger.warning("Unable to format " + pattern
77:                            + " with value " + value, e);
78:                    return namespace + NamespaceHandler.NAMESPACE_SEPARATOR
79:                            + value;
80:                }
81:            }
82:
83:            /**
84:             * Return true if there is an inter-wiki mapping for the given namespace.
85:             *
86:             * @param namespace The inter-wiki link namespace corresponding to the key
87:             *  value in the interwiki.properties file.  This link is compared in a
88:             *  case-insensitive manner.
89:             * @return <code>true</code> if an inter-wiki mapping exists, <code>false</code>
90:             *  otherwise.
91:             */
92:            public static boolean isInterWiki(String namespace) {
93:                return InterWikiHandler.mapping.containsKey(namespace
94:                        .toLowerCase());
95:            }
96:        }
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