| 1 | package dolda.jsvc.util; |
| 2 | |
| 3 | import dolda.jsvc.*; |
| 4 | import java.io.*; |
| 5 | import java.util.*; |
| 6 | |
| 7 | public abstract class ResponseBuffer implements Request { |
| 8 | private boolean flushed = false; |
| 9 | private int respcode = -1; |
| 10 | private String resptext = null; |
| 11 | private OutputStream out = null, wrapout = null; |
| 12 | private MultiMap<String, String> headers = new HeaderTreeMap() { |
| 13 | protected void modified() { |
| 14 | ckflush(); |
| 15 | } |
| 16 | }; |
| 17 | |
| 18 | private void ckflush() { |
| 19 | if(flushed) |
| 20 | throw(new IllegalStateException("Response has been flushed; header information cannot be modified")); |
| 21 | } |
| 22 | |
| 23 | private void flush() { |
| 24 | if(flushed) |
| 25 | return; |
| 26 | if(respcode < 0) { |
| 27 | respcode = 200; |
| 28 | resptext = "OK"; |
| 29 | } |
| 30 | backflush(); |
| 31 | out = realoutput(); |
| 32 | flushed = true; |
| 33 | } |
| 34 | |
| 35 | private class FlushStream extends OutputStream { |
| 36 | private FlushStream() { |
| 37 | } |
| 38 | |
| 39 | public void flush() throws IOException { |
| 40 | ResponseBuffer.this.flush(); |
| 41 | out.flush(); |
| 42 | } |
| 43 | |
| 44 | public void close() throws IOException { |
| 45 | flush(); |
| 46 | out.close(); |
| 47 | } |
| 48 | |
| 49 | public void write(int b) throws IOException { |
| 50 | ResponseBuffer.this.flush(); |
| 51 | out.write(b); |
| 52 | } |
| 53 | |
| 54 | public void write(byte[] b) throws IOException { |
| 55 | write(b, 0, b.length); |
| 56 | } |
| 57 | |
| 58 | public void write(byte[] b, int off, int len) throws IOException { |
| 59 | ResponseBuffer.this.flush(); |
| 60 | out.write(b, off, len); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | public OutputStream output() { |
| 65 | if(wrapout == null) |
| 66 | wrapout = new BufferedOutputStream(new FlushStream(), 16384); |
| 67 | return(wrapout); |
| 68 | } |
| 69 | |
| 70 | public void status(int code) { |
| 71 | status(code, Misc.statustext(code)); |
| 72 | } |
| 73 | |
| 74 | public void status(int code, String text) { |
| 75 | ckflush(); |
| 76 | respcode = code; |
| 77 | resptext = text; |
| 78 | } |
| 79 | |
| 80 | public MultiMap<String, String> outheaders() { |
| 81 | return(headers); |
| 82 | } |
| 83 | |
| 84 | protected abstract void backflush(); |
| 85 | protected abstract OutputStream realoutput(); |
| 86 | } |