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Java > Open Source Codes > org > netbeans > tax > io > TreeReader


1 /*
2  * The contents of this file are subject to the terms of the Common Development
3  * and Distribution License (the License). You may not use this file except in
4  * compliance with the License.
5  *
6  * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7  * or http://www.netbeans.org/cddl.txt.
8  *
9  * When distributing Covered Code, include this CDDL Header Notice in each file
10  * and include the License file at http://www.netbeans.org/cddl.txt.
11  * If applicable, add the following below the CDDL Header, with the fields
12  * enclosed by brackets [] replaced by your own identifying information:
13  * "Portions Copyrighted [year] [name of copyright owner]"
14  *
15  * The Original Software is NetBeans. The Initial Developer of the Original
16  * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17  * Microsystems, Inc. All Rights Reserved.
18  */
19 package org.netbeans.tax.io;
20
21 import java.io.*;
22
23 import org.netbeans.tax.TreeDocumentRoot;
24 import org.netbeans.tax.TreeException;
25 import org.netbeans.tax.io.TreeStreamResult;
26 import org.netbeans.tax.io.TreeWriter;
27
28 /**
29  * Access tree content using reader. The tree MUST NOT change until the
30  * reader is closed. It is responsibility of caller.
31  *
32  * @author Petr Kuzel
33  * @version 0.9
34  */
35 public class TreeReader extends Reader {
36
37     private final StringReader reader;
38
39     /**
40      * Creates new TreeReader that is immediatelly ready for reading.
41      */
42     public TreeReader (TreeDocumentRoot doc) throws IOException {
43         
44         reader = new StringReader (Convertors.treeToString (doc));
45         
46     }
47     
48     public void close () throws IOException {
49         if (reader == null) throw new IOException (Util.THIS.getString ("EXC_null_reader"));
50         reader.close ();
51     }
52     
53     public int read (char[] cbuf, int off, int len) throws IOException {
54         if (reader == null) throw new IOException (Util.THIS.getString ("EXC_null_reader"));
55         return reader.read (cbuf, off, len);
56     }
57 }
58
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