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Java > Open Source Codes > org > swixml > converters > PrimitiveConverter


1 /*--
2  $Id: PrimitiveConverter.java,v 1.1 2004/03/01 07:56:02 wolfpaulus Exp $
3
4  Copyright (C) 2003-2004 Wolf Paulus.
5  All rights reserved.
6
7  Redistribution and use in source and binary forms, with or without
8  modification, are permitted provided that the following conditions
9  are met:
10
11  1. Redistributions of source code must retain the above copyright
12  notice, this list of conditions, and the following disclaimer.
13
14  2. Redistributions in binary form must reproduce the above copyright
15  notice, this list of conditions, and the disclaimer that follows
16  these conditions in the documentation and/or other materials provided
17  with the distribution.
18
19  3. The end-user documentation included with the redistribution,
20  if any, must include the following acknowledgment:
21         "This product includes software developed by the
22          SWIXML Project (http://www.swixml.org/)."
23  Alternately, this acknowledgment may appear in the software itself,
24  if and wherever such third-party acknowledgments normally appear.
25
26  4. The name "Swixml" must not be used to endorse or promote products
27  derived from this software without prior written permission. For
28  written permission, please contact <info_AT_swixml_DOT_org>
29
30  5. Products derived from this software may not be called "Swixml",
31  nor may "Swixml" appear in their name, without prior written
32  permission from the Swixml Project Management.
33
34  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
35  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
36  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
37  DISCLAIMED. IN NO EVENT SHALL THE SWIXML PROJECT OR ITS
38  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
41  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
42  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
43  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
44  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
45  SUCH DAMAGE.
46  ====================================================================
47
48  This software consists of voluntary contributions made by many
49  individuals on behalf of the Swixml Project and was originally
50  created by Wolf Paulus <wolf_AT_swixml_DOT_org>. For more information
51  on the Swixml Project, please see <http://www.swixml.org/>.
52 */

53
54 package org.swixml.converters;
55
56 import org.jdom.Attribute;
57 import org.jdom.DataConversionException;
58 import org.swixml.Converter;
59 import org.swixml.Localizer;
60 import org.swixml.Parser;
61
62 import javax.swing.*;
63 import javax.swing.tree.TreeSelectionModel JavaDoc;
64 import java.awt.*;
65 import java.util.HashMap JavaDoc;
66 import java.util.Map JavaDoc;
67
68 /**
69  * The <code>PrimitiveConverter</code> class defines a converter that creates primitive objects (wrapper),
70  * based on a provided input Class and String.
71  *
72  * @author <a HREF="mailto:wolf@paulus.com">Wolf Paulus</a>
73  * @version $Revision: 1.1 $
74  * @see org.swixml.ConverterLibrary
75
76  */

77
78 public class PrimitiveConverter implements Converter, SwingConstants, KeyEvent, InputEvent {
79
80   /** converter's return type */
81   public static final Class JavaDoc TEMPLATE = Object JavaDoc.class;
82   /** map contains all constant provider types */
83   private static Map JavaDoc dictionaries = new HashMap JavaDoc();
84   /**
85    * Static Initializer, setting up the initial constant providers
86    */

87   static {
88
89     PrimitiveConverter.addConstantProvider( JTabbedPane.class );
90     PrimitiveConverter.addConstantProvider( JScrollPane.class );
91     PrimitiveConverter.addConstantProvider( GridBagConstraints.class );
92     PrimitiveConverter.addConstantProvider( FlowLayout.class );
93     PrimitiveConverter.addConstantProvider( ListSelectionModel.class );
94     PrimitiveConverter.addConstantProvider( TreeSelectionModel JavaDoc.class );
95     PrimitiveConverter.addConstantProvider( WindowConstants.class );
96     PrimitiveConverter.addConstantProvider( JFrame.class );
97
98   };
99   /**
100    * Converts String into java primitive type
101    * @param type <code>Class</code> target type
102    * @param attr <code>Attribute</code> value field needs to provide convertable String
103    * @return <code>Object</code> primitive wrapped into wrapper object
104    */

105   public static Object JavaDoc conv( final Class JavaDoc type, final Attribute attr, final Localizer localizer ) throws Exception JavaDoc {
106     Attribute a = (Attribute) attr.clone();
107     Object JavaDoc obj = null;
108     if ( Parser.LOCALIZED_ATTRIBUTES.contains( a.getName().toLowerCase() ))
109       if (a.getAttributeType() == Attribute.CDATA_TYPE )
110          a.setValue( localizer.getString( a.getValue() ));
111
112     try {
113       if (boolean.class.equals( type )) {
114         obj = new Boolean JavaDoc( a.getBooleanValue() );
115       } else if (int.class.equals( type )) {
116         obj = new Integer JavaDoc( a.getIntValue() );
117       } else if (long.class.equals( type )) {
118         obj = new Long JavaDoc( a.getLongValue() );
119       } else if (float.class.equals( type )) {
120         obj = new Float JavaDoc( a.getFloatValue() );
121       } else if (double.class.equals( type )) {
122         obj = new Double JavaDoc( a.getDoubleValue() );
123       }
124     } catch (DataConversionException e) {
125     } finally {
126       if (obj==null) {
127         try {
128           String JavaDoc s = a.getValue();
129           int k = s.indexOf( '.' ) - 1;
130           Class JavaDoc pp = (Class JavaDoc) dictionaries.get( s.substring( 0, s.indexOf( '.' ) ) );
131           obj = pp.getField( s.substring( k + 2 ) ).get( pp );
132         } catch (Exception JavaDoc ex) {
133           //
134
// Try to find the given value as a Constant in SwingConstants
135
//
136
obj = PrimitiveConverter.class.getField( a.getValue() ).get( PrimitiveConverter.class );
137         }
138       }
139     }
140
141     return obj;
142   }
143
144   /**
145    * Converts String into java primitive type
146    * @param type <code>Class</code> target type
147    * @param attr <code>Attribute</code> value field needs to provide convertable String
148    * @return <code>Object</code> primitive wrapped into wrapper object
149    * @throws Exception
150    */

151   public Object JavaDoc convert( final Class JavaDoc type, final Attribute attr, final Localizer localizer ) throws Exception JavaDoc {
152     return PrimitiveConverter.conv( type, attr, localizer );
153   }
154
155   /**
156    * A <code>Converters</code> conversTo method informs about the Class type the converter
157    * is returning when its <code>convert</code> method is called
158    * @return <code>Class</code> - the Class the converter is returning when its convert method is called
159    */

160   public Class JavaDoc convertsTo() {
161     return TEMPLATE;
162   }
163
164   /**
165    * Adds a new class or interface to the dictionary of primitive providers.
166    * @param type <code>Class</code> providing primitive constants / public (final) fields
167    */

168   public static void addConstantProvider(final Class JavaDoc type) {
169     String JavaDoc shortName = type.getName().substring(type.getName().lastIndexOf( '.' ) + 1 );
170     dictionaries.put( shortName, type );
171   }
172 }
173
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