SingleCharReader


1   /*******************************************************************************
2    * Copyright (c) 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.pde.internal.ui.editor.contentassist.display;
12  
13  
14  import java.io.IOException  ;
15  import java.io.Reader  ;
16  
17  abstract class SingleCharReader extends Reader   {
18  
19      /**
20       * @see Reader#read()
21       */
22      public abstract int read() throws IOException  ;
23  
24      /**
25       * @see Reader#read(char[],int,int)
26       */
27      public int read(char cbuf[], int off, int len) throws IOException   {
28          int end= off + len;
29          for (int i= off; i < end; i++) {
30              int ch= read();
31              if (ch == -1) {
32                  if (i == off)
33                      return -1;
34                  return i - off;
35              }
36              cbuf[i]= (char)ch;
37          }
38          return len;
39      }
40  
41      /**
42       * @see Reader#ready()
43       */
44      public boolean ready() throws IOException   {
45          return true;
46      }
47  
48      /**
49       * Returns the readable content as string.
50       * @return the readable content as string
51       * @exception IOException in case reading fails
52       */
53      public String   getString() throws IOException   {
54          StringBuffer   buf= new StringBuffer  ();
55          int ch;
56          while ((ch= read()) != -1) {
57              buf.append((char)ch);
58          }
59          return buf.toString();
60      }
61  }
62
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