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Java > Open Source Codes > org > apache > ojb > broker > ant > WriteDtdToFileCommand


1 package org.apache.ojb.broker.ant;
2
3 /* Copyright 2005 The Apache Software Foundation.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 import java.io.File JavaDoc;
19 import java.io.FileWriter JavaDoc;
20
21 import org.apache.ddlutils.io.DataDtdWriter;
22 import org.apache.ddlutils.model.Database;
23 import org.apache.ojb.broker.metadata.DescriptorRepository;
24 import org.apache.tools.ant.BuildException;
25 import org.apache.tools.ant.Project;
26 import org.apache.tools.ant.Task;
27
28 /**
29  * The command for creating a data DTD for a given database model.
30  *
31  * @author Thomas Dudziak
32  * @version $Revision: 1.1.2.2 $
33  */
34 public class WriteDtdToFileCommand extends Command
35 {
36     /** The file to output the DTD to. */
37     private File JavaDoc _outputFile;
38
39     /**
40      * Sets the file to output the DTD to.
41      *
42      * @param outputFile The output file
43      */
44     public void setOutputFile(File JavaDoc outputFile)
45     {
46         _outputFile = outputFile;
47     }
48
49     /**
50      * {@inheritDoc}
51      */
52     public boolean isRequiringModel()
53     {
54         return true;
55     }
56
57     /**
58      * {@inheritDoc}
59      */
60     public void execute(Task task, Database dbModel, DescriptorRepository objModel) throws BuildException
61     {
62         if (_outputFile == null)
63         {
64             throw new BuildException("No output file specified");
65         }
66         if (_outputFile.exists() && !_outputFile.canWrite())
67         {
68             throw new BuildException("Cannot overwrite output file "+_outputFile.getAbsolutePath());
69         }
70
71         try
72         {
73             FileWriter JavaDoc outputWriter = new FileWriter JavaDoc(_outputFile);
74             DataDtdWriter dtdWriter = new DataDtdWriter();
75             DdlUtilsDataHandling handling = new DdlUtilsDataHandling();
76
77             handling.setModel(dbModel, objModel);
78             handling.getDataDTD(outputWriter);
79             outputWriter.close();
80             task.log("Written DTD to "+_outputFile.getAbsolutePath(), Project.MSG_INFO);
81         }
82         catch (Exception JavaDoc ex)
83         {
84             throw new BuildException("Failed to write to output file "+_outputFile.getAbsolutePath(), ex);
85         }
86     }
87 }
88
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