1 /*
2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/DynamicTag.java,v 1.7 2002/05/17 15:18:12 jstrachan Exp $
3 * $Revision: 1.7 $
4 * $Date: 2002/05/17 15:18:12 $
5 *
6 * ====================================================================
7 *
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution, if
26 * any, must include the following acknowlegement:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowlegement may appear in the software itself,
30 * if and wherever such third-party acknowlegements normally appear.
31 *
32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
33 * Foundation" must not be used to endorse or promote products derived
34 * from this software without prior written permission. For written
35 * permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache"
38 * nor may "Apache" appear in their names without prior written
39 * permission of the Apache Group.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
57 * information on the Apache Software Foundation, please see
58 * <http://www.apache.org/>.
59 *
60 * $Id: DynamicTag.java,v 1.7 2002/05/17 15:18:12 jstrachan Exp $
61 */
62 package org.apache.commons.jelly.tags.swing;
63
64 import java.awt.event.ActionEvent;
65 import java.util.Iterator;
66 import java.util.Map;
67
68 import javax.swing.*;
69
70 import org.apache.commons.beanutils.BeanUtils;
71
72 import org.apache.commons.jelly.JellyException;
73 import org.apache.commons.jelly.MapTagSupport;
74 import org.apache.commons.jelly.XMLOutput;
75
76 import org.apache.commons.logging.Log;
77 import org.apache.commons.logging.LogFactory;
78
79 /***
80 * Creates a Swing Action and attaches it to the parent component. The This tag creates a Swing component and adds it to its parent tag, optionally declaring this
81 * component as a variable if the <i>var</i> attribute is specified.</p>
82 *
83 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
84 * @version $Revision: 1.7 $
85 */
86 public class ActionTag extends MapTagSupport {
87
88 /*** The Log to which logging calls will be made. */
89 private static final Log log = LogFactory.getLog(ActionTag.class);
90
91 /*** the current action instance */
92 private Action action;
93
94 public ActionTag() {
95 }
96
97 // Tag interface
98 //-------------------------------------------------------------------------
99 public void doTag(final XMLOutput output) throws Exception {
100
101 Map map = getAttributes();
102 action = (Action) map.remove( "action" );
103 Object classObject = map.remove("className");
104 String var = (String) map.remove( "var" );
105
106 if ( action == null ) {
107 Class actionClass = null;
108 if ( classObject != null ) {
109 if ( classObject instanceof Class ) {
110 actionClass = (Class) classObject;
111 }
112 else {
113 String name = classObject.toString();
114 try {
115 actionClass = Class.forName( name );
116 }
117 catch (Throwable t) {
118 throw new JellyException( "Could not find class: " + name + " for this <action> tag. Exception: " +t, t );
119 }
120 }
121 if ( actionClass != null ) {
122 action = (Action) actionClass.newInstance();
123 }
124 }
125 }
126 if ( action == null ) {
127 action = new AbstractAction() {
128 public void actionPerformed(ActionEvent event) {
129 context.setVariable( "event", event );
130 try {
131 invokeBody(output);
132 }
133 catch (Exception e) {
134 log.error( "Caught: " + e, e );
135 }
136 }
137 };
138 }
139
140 // now lets set the properties on the action object
141 for ( Iterator iter = map.entrySet().iterator(); iter.hasNext(); ) {
142 Map.Entry entry = (Map.Entry) iter.next();
143 String name = (String) entry.getKey();
144
145 // typically standard Action names start with upper case, so lets upper case it
146 name = capitalize(name);
147 Object value = entry.getValue();
148
149 action.putValue( name, value );
150 }
151
152 if ( var != null ) {
153 context.setVariable( var, action );
154 }
155
156
157 // now lets add this action to its parent if we have one
158 ComponentTag tag = (ComponentTag) findAncestorWithClass( ComponentTag.class );
159 if ( tag != null ) {
160 tag.setAction(action);
161 }
162 }
163
164 // Properties
165 //-------------------------------------------------------------------------
166
167 /***
168 * @return the Action object for this tag
169 */
170 public Action getAction() {
171 return action;
172 }
173
174
175 // Implementation methods
176 //-------------------------------------------------------------------------
177 protected String capitalize(String text) {
178 char ch = text.charAt(0);
179 if ( Character.isUpperCase( ch ) ) {
180 return text;
181 }
182 StringBuffer buffer = new StringBuffer(text.length());
183 buffer.append( Character.toUpperCase( ch ) );
184 buffer.append( text.substring(1) );
185 return buffer.toString();
186 }
187
188
189 }
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