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Java > Open Source Codes > org > hsqldb > scriptio > ScriptWriterZipped


1 /* Copyright (c) 2001-2005, The HSQL Development Group
2  * All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  *
7  * Redistributions of source code must retain the above copyright notice, this
8  * list of conditions and the following disclaimer.
9  *
10  * Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  *
14  * Neither the name of the HSQL Development Group nor the names of its
15  * contributors may be used to endorse or promote products derived from this
16  * software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
22  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30
31
32 package org.hsqldb.scriptio;
33
34 import java.io.IOException JavaDoc;
35 import java.util.zip.Deflater JavaDoc;
36 import java.util.zip.DeflaterOutputStream JavaDoc;
37
38 import org.hsqldb.Database;
39 import org.hsqldb.HsqlException;
40 import org.hsqldb.Trace;
41 import org.hsqldb.lib.FileAccess;
42
43 /**
44  *
45  * @author fredt@users
46  * @since 1.7.2
47  * @version 1.7.2
48  */
49 class ScriptWriterZipped extends ScriptWriterBinary {
50
51     private static final int bufferSize = 1 << 15;
52
53     ScriptWriterZipped(Database db, String JavaDoc file, boolean includeCached,
54                        boolean newFile) throws HsqlException {
55         super(db, file, includeCached, newFile);
56     }
57
58     /**
59      * Override the underlying method with no operation.
60      */
61     public void sync() {}
62
63     protected void openFile() throws HsqlException {
64
65         try {
66             FileAccess fa = database.getFileAccess();
67             java.io.OutputStream JavaDoc fos = fa.openOutputStreamElement(outFile);
68
69             outDescriptor = fa.getFileSync(fos);
70             fileStreamOut = new DeflaterOutputStream JavaDoc(fos,
71                     new Deflater JavaDoc(Deflater.DEFAULT_COMPRESSION), bufferSize);
72         } catch (IOException JavaDoc e) {
73             throw Trace.error(Trace.FILE_IO_ERROR, Trace.Message_Pair,
74                               new Object JavaDoc[] {
75                 e.toString(), outFile
76             });
77         }
78     }
79
80     /**
81      * This may not really be necessary, unless we add implementations where
82      * non-compressed data is added to the end of the copressed part.
83      */
84     protected void finishStream() throws IOException JavaDoc {
85         ((DeflaterOutputStream JavaDoc) fileStreamOut).finish();
86         fileStreamOut.flush();
87     }
88 }
89
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