SingleCharReader


1   /*******************************************************************************
2    * Copyright (c) 2000, 2006 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.jface.internal.text.html;
12  
13  import java.io.IOException  ;
14  import java.io.Reader  ;
15  
16  
17  /**
18   * <p>
19   * Moved into this package from <code>org.eclipse.jface.internal.text.revisions</code>.</p>
20   */
21  public abstract class SingleCharReader extends Reader   {
22  
23      /**
24       * @see Reader#read()
25       */
26      public abstract int read() throws IOException  ;
27  
28      /**
29       * @see Reader#read(char[],int,int)
30       */
31      public int read(char cbuf[], int off, int len) throws IOException   {
32          int end= off + len;
33          for (int i= off; i < end; i++) {
34              int ch= read();
35              if (ch == -1) {
36                  if (i == off)
37                      return -1;
38                  return i - off;
39              }
40              cbuf[i]= (char)ch;
41          }
42          return len;
43      }
44  
45      /**
46       * @see Reader#ready()
47       */
48      public boolean ready() throws IOException   {
49          return true;
50      }
51  
52      /**
53       * Returns the readable content as string.
54       * @return the readable content as string
55       * @exception IOException in case reading fails
56       */
57      public String   getString() throws IOException   {
58          StringBuffer   buf= new StringBuffer  ();
59          int ch;
60          while ((ch= read()) != -1) {
61              buf.append((char)ch);
62          }
63          return buf.toString();
64      }
65  }
66
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