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Java > Open Source Codes > com > idaremedia > antx > valueuri > condition > XDefCheckValueURIHandler


1 /**
2  * $Id: XDefCheckValueURIHandler.java 180 2007-03-15 12:56:38Z ssmc $
3  * Copyright 2005 iDare Media, Inc. All rights reserved.
4  *
5  * Originally written by iDare Media, Inc. for release into the public domain. This
6  * library, source form and binary form, is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public License (LGPL) as published
8  * by the Free Software Foundation; either version 2.1 of the License, or (at your option)
9  * any later version.<p>
10  *
11  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
12  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13  * See the GNU LGPL for more details.<p>
14  *
15  * You should have received a copy of the GNU Lesser General Public License along with this
16  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite
17  * 330, Boston, MA 02111-1307 USA. The GNU LGPL can be found online at
18  * http://www.fsf.org/copyleft/lesser.html<p>
19  *
20  * This product has been influenced by several projects within the open-source community.
21  * The JWare developers wish to acknowledge the open-source community's support. For more
22  * information regarding the open-source products used within JWare, please visit the
23  * JWare website.
24  *----------------------------------------------------------------------------------------*
25  * WEBSITE- http://www.jware.info EMAIL- inquiries@jware.info
26  *----------------------------------------------------------------------------------------*
27  **/
28
29 package com.idaremedia.antx.valueuri.condition;
30
31 import org.apache.tools.ant.ComponentHelper;
32
33 import com.idaremedia.antx.apis.Requester;
34 import com.idaremedia.antx.starters.ValueURIHandlerSkeleton;
35
36 /**
37  * Value URI handler that returns "true" or "false" depending on whether the named
38  * Ant type is already defined. This handler works for any Ant type (taskdef or typedef).
39  * The general form of the URI:
40  * <span class="src">$istype:<nobr>typename</nobr></span>.
41  * <p/>
42  * <b>Example Usage:</b><pre>
43  * &lt;do if="emma.present" false="${$istask:emma}"&gt;
44  * &#8230;
45  *
46  * -- To Install --
47  * &lt;manageuris action="install"&gt;
48  * &lt;parameter name="istask"
49  * value="com.idaremedia.antx.valueuri.condition.XDefCheckValueURIHandler"/&gt;
50  * &lt;parameter name="istype"
51  * value="com.idaremedia.antx.valueuri.condition.XDefCheckValueURIHandler"/&gt;
52  * &lt;/manageuris&gt;
53  * </pre>
54  *
55  * @since JWare/AntX 0.5
56  * @author ssmc, &copy;2005 <a HREF="http://www.jware.info">iDare&nbsp;Media,&nbsp;Inc.</a>
57  * @version 0.5
58  * @.safety multiple
59  * @.group api,helper
60  **/
61
62 public final class XDefCheckValueURIHandler extends ValueURIHandlerSkeleton
63 {
64     /**
65      * Initalizes a new type check handler.
66      **/
67     public XDefCheckValueURIHandler()
68     {
69         super();
70     }
71
72
73     /**
74      * Returns "true" if the named item is already defined in the current
75      * Ant type system.
76      **/
77     public String JavaDoc valueFrom(String JavaDoc uriFragment, String JavaDoc fullUri, Requester clnt)
78     {
79         String JavaDoc typename = uriFragment;
80         int i = uriFragment.indexOf("?");
81         if (i>=0) {
82             typename = uriFragment.substring(0,i);
83         }
84         ComponentHelper ch = ComponentHelper.getComponentHelper(clnt.getProject());
85         return String.valueOf(ch.getDefinition(typename)!=null);
86     }
87 }
88
89 /* end-of-XDefCheckValueURIHandler.java */
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