CharSpool


1   package hudson.util;
2   
3   import java.io.IOException  ;
4   import java.io.Writer  ;
5   import java.util.LinkedList  ;
6   import java.util.List  ;
7   
8   /**
9    * {@link Writer} that spools the output and writes to another {@link Writer} later.
10   *
11   * @author Kohsuke Kawaguchi
12   */
13  public final class CharSpool extends Writer   {
14      private List  <char[]> buf;
15  
16      private char[] last = new char[1024];
17      private int pos;
18  
19      public void write(char cbuf[], int off, int len) {
20          while(len>0) {
21              int sz = Math.min(last.length-pos,len);
22              System.arraycopy(cbuf,off,last,pos,sz);
23              len -= sz;
24              off += sz;
25              pos += sz;
26              renew();
27          }
28      }
29  
30      private void renew() {
31          if(pos<last.length)
32              return;
33  
34          if(buf==null)
35              buf = new LinkedList  <char[]>();
36          buf.add(last);
37          last = new char[1024];
38          pos = 0;
39      }
40  
41      public void write(int c) {
42          renew();
43          last[pos++] = (char)c;
44      }
45  
46      public void flush() {
47          // noop
48      }
49  
50      public void close() {
51          // noop
52      }
53  
54      public void writeTo(Writer   w) throws IOException   {
55          if(buf!=null) {
56              for (char[] cb : buf) {
57                  w.write(cb);
58              }
59          }
60          w.write(last,0,pos);
61      }
62  }
63
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags