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1 package cachingfilter;
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2
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3 import java.io.IOException;
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4 import java.io.OutputStream;
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5 import java.io.ByteArrayOutputStream;
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6 import javax.servlet.ServletOutputStream;
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7
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8
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9 public abstract class ProxyServletOutputStream extends ServletOutputStream {
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10 private static final int BUFFER_SIZE = 100;
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11
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12 private OutputStream out = new OutputStream() {
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13 private final ByteArrayOutputStream buf = new ByteArrayOutputStream();
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14
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15 public void write(int b) throws IOException {
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16 buf.write(b);
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17 check();
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18 }
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19
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20 public void write(byte b[]) throws IOException {
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21 buf.write(b);
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22 check();
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23 }
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24
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25 public void write(byte b[], int off, int len) throws IOException {
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26 buf.write(b,off,len);
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27 check();
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28 }
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29
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30 public void flush() throws IOException {
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31 setOut();
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32 out.flush();
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33 }
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34
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35 public void close() throws IOException {
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36 setOut();
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37 out.close();
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38 }
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39
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40 void check() throws IOException {
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41 if( buf.size() >= BUFFER_SIZE )
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42 setOut();
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43 }
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44
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45 private void setOut() throws IOException {
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46 out = newOutputStream();
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47 out.write(buf.toByteArray());
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48 }
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49 };
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50
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51 protected abstract OutputStream newOutputStream() throws IOException;
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52
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53 public void write(int b) throws IOException {
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54 out.write(b);
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55 }
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56
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57 public void write(byte b[]) throws IOException {
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58 out.write(b);
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59 }
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60
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61 public void write(byte b[], int off, int len) throws IOException {
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62 out.write(b,off,len);
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63 }
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64
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65 public void flush() throws IOException {
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66 out.flush();
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67 }
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68
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69 public void close() throws IOException {
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70 out.close();
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71 }
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72 }
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