GuardedWriter


1   /*
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3    * and Distribution License (the License). You may not use this file except in
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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]"
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15   * The Original Software is NetBeans. The Initial Developer of the Original
16   * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
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18   */
19  
20  package org.netbeans.modules.editor.guards;
21  
22  import java.io.CharArrayWriter  ;
23  import java.io.IOException  ;
24  import java.io.OutputStream  ;
25  import java.io.OutputStreamWriter  ;
26  import java.io.UnsupportedEncodingException  ;
27  import java.io.Writer  ;
28  import java.util.List  ;
29  import org.netbeans.api.editor.guards.GuardedSection;
30  import org.netbeans.spi.editor.guards.support.AbstractGuardedSectionsProvider;
31  
32  /** This stream is able to insert special guarded comments.
33  */
34  final class GuardedWriter extends Writer   {
35      /** Encapsulated writer. */
36      private Writer   writer;
37  
38      private CharArrayWriter   buffer;
39  
40      private final AbstractGuardedSectionsProvider gw;
41  
42      private boolean isClosed = false;
43  
44      private final List  <GuardedSection> sections;
45  
46      
47      /** Creates new GuardedWriter.
48      * @param os Encapsulated output stream.
49      * @param list The list of the guarded sections.
50      */
51      public GuardedWriter(AbstractGuardedSectionsProvider gw, OutputStream   os, List  <GuardedSection> list, String   encoding) throws UnsupportedEncodingException   {
52          if (encoding == null)
53              writer = new OutputStreamWriter  (os);
54          else
55              writer = new OutputStreamWriter  (os, encoding);
56          this.gw = gw;
57          sections = list;
58      }
59  
60      /** Writes chars to underlying writer */
61      public void write(char[] cbuf, int off, int len) throws IOException   {
62          
63          if (buffer == null) {
64              buffer = new CharArrayWriter  (10240);
65          }
66          
67          buffer.write(cbuf, off, len);
68      }
69  
70      /** Calls underlying writer flush */
71      public void close() throws IOException   {
72          if (isClosed) {
73              return;
74          }
75          isClosed = true;
76          if (buffer != null) {
77              char[] content = this.gw.writeSections(sections, buffer.toCharArray());
78              writer.write(content);
79          }
80          writer.close();
81      }
82  
83      /** Calls underlying writer flush */
84      public void flush() throws IOException   {
85      }
86      
87  }
88
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