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Java > Open Source Codes > org > displaytag > export > DefaultItextExportView


1 /**
2  * Licensed under the Artistic License; you may not use this file
3  * except in compliance with the License.
4  * You may obtain a copy of the License at
5  *
6  * http://displaytag.sourceforge.net/license.html
7  *
8  * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
9  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
10  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
11  */
12 package org.displaytag.export;
13
14 import java.io.OutputStream JavaDoc;
15
16 import javax.servlet.jsp.JspException JavaDoc;
17
18 import org.displaytag.Messages;
19 import org.displaytag.exception.BaseNestableJspTagException;
20 import org.displaytag.exception.SeverityEnum;
21 import org.displaytag.model.TableModel;
22 import org.displaytag.render.ItextTableWriter;
23
24 import com.lowagie.text.Document;
25 import com.lowagie.text.DocumentException;
26 import com.lowagie.text.PageSize;
27 import com.lowagie.text.Table;
28
29
30 /**
31  * Exporter using iText: subclasses export to any of the iText document types, such as PDF and RTF.
32  * @author Jorge L. Barroso
33  * @version $Revision$ ($Author$)
34  */
35 public abstract class DefaultItextExportView implements BinaryExportView
36 {
37
38     /**
39      * TableModel to render.
40      */
41     private TableModel model;
42
43     /**
44      * @see org.displaytag.export.ExportView#setParameters(TableModel, boolean, boolean, boolean)
45      */
46     public void setParameters(TableModel tableModel, boolean exportFullList, boolean includeHeader,
47         boolean decorateValues)
48     {
49         this.model = tableModel;
50     }
51
52     /**
53      * @see org.displaytag.export.BaseExportView#getMimeType() Meant to be overwritten by subclasses.
54      * @return null
55      */
56     public String JavaDoc getMimeType()
57     {
58         return null;
59     }
60
61     /**
62      * @see org.displaytag.export.BinaryExportView#doExport(OutputStream)
63      */
64     public void doExport(OutputStream JavaDoc out) throws JspException JavaDoc
65     {
66         try
67         {
68             Document document = new Document(PageSize.A4.rotate(), 60, 60, 40, 40);
69             this.initItextWriter(document, out);
70             document.open();
71             Table table = new Table(this.model.getNumberOfColumns());
72             ItextTableWriter writer = new ItextTableWriter(table, document);
73             writer.writeTable(this.model, "-1");
74             document.add(table);
75             document.close();
76         }
77         catch (Exception JavaDoc e)
78         {
79             throw new ItextGenerationException(e);
80         }
81     }
82
83     /**
84      * Initializes the iText writer used by export view to write iText document, such as PDF or RTF iText writer.
85      * @param document The iText document to be written.
86      * @param out The output stream to which the document is written.
87      * @throws DocumentException If something goes wrong during initialization.
88      */
89     protected abstract void initItextWriter(Document document, OutputStream JavaDoc out) throws DocumentException;
90
91     /**
92      * Wraps iText-generated exceptions.
93      * @author Fabrizio Giustina
94      * @version $Revision$ ($Author$)
95      */
96     static class ItextGenerationException extends BaseNestableJspTagException
97     {
98
99         /**
100          * D1597A17A6.
101          */
102         private static final long serialVersionUID = 899149338534L;
103
104         /**
105          * Instantiate a new PdfGenerationException with a fixed message and the given cause.
106          * @param cause Previous exception
107          */
108         public ItextGenerationException(Throwable JavaDoc cause)
109         {
110             super(DefaultItextExportView.class, Messages.getString("DefaultItextExportView.errorexporting"), cause); //$NON-NLS-1$
111 this.initCause(cause);
112         }
113
114         /**
115          * @see org.displaytag.exception.BaseNestableJspTagException#getSeverity()
116          */
117         public SeverityEnum getSeverity()
118         {
119             return SeverityEnum.ERROR;
120         }
121     }
122 }
123
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