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Java > Open Source Codes > net > sf > jasperreports > engine > design > JRJavacCompiler


1 /*
2  * ============================================================================
3  * GNU Lesser General Public License
4  * ============================================================================
5  *
6  * JasperReports - Free Java report-generating library.
7  * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * JasperSoft Corporation
24  * 303 Second Street, Suite 450 North
25  * San Francisco, CA 94107
26  * http://www.jaspersoft.com
27  */
28 package net.sf.jasperreports.engine.design;
29
30 import java.io.ByteArrayOutputStream JavaDoc;
31 import java.io.File JavaDoc;
32 import java.io.InputStream JavaDoc;
33
34 import net.sf.jasperreports.engine.JRException;
35
36
37 /**
38  * @author Teodor Danciu (teodord@users.sourceforge.net)
39  * @version $Id: JRJavacCompiler.java 1229 2006-04-19 13:27:35 +0300 (Wed, 19 Apr 2006) teodord $
40  */
41 public class JRJavacCompiler extends JRAbstractMultiClassCompiler
42 {
43
44
45     /**
46      *
47      */
48     public String JavaDoc compileClasses(File JavaDoc[] sourceFiles, String JavaDoc classpath) throws JRException
49     {
50         String JavaDoc[] source = new String JavaDoc[sourceFiles.length + 3];
51         source[0] = "javac";
52         source[1] = "-classpath";
53         source[2] = classpath;
54         for (int i = 0; i < sourceFiles.length; i++)
55         {
56             source[i + 3] = sourceFiles[i].getPath();
57         }
58         
59         try
60         {
61             // Compile the source file and arrange to read the errors if any.
62 Process JavaDoc compile = Runtime.getRuntime().exec(source);
63             InputStream JavaDoc errFile = compile.getErrorStream();
64             
65             // Read the error messages (if any) into the ByteArrayOutputStream
66 ByteArrayOutputStream JavaDoc baos = new ByteArrayOutputStream JavaDoc();
67             byte[] buffer = new byte[1024];
68             int count = 0;
69             do
70             {
71                 count = errFile.read(buffer);
72                 if (count > 0)
73                 {
74                     baos.write(buffer, 0, count);
75                 }
76             } while (count >= 0);
77             
78             if( baos.toString().indexOf("error") != -1 )
79             {
80                 return baos.toString();
81             }
82             
83             return null;
84         }
85         catch (Exception JavaDoc e)
86         {
87             StringBuffer JavaDoc files = new StringBuffer JavaDoc();
88             for (int i = 0; i < sourceFiles.length; ++i)
89             {
90                 files.append(sourceFiles[i].getPath());
91                 files.append(' ');
92             }
93             throw new JRException("Error compiling report java source files : " + files, e);
94         }
95     }
96
97
98 }
99
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