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17 package org.apache.log4j;
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19 import org.apache.log4j.spi.ThrowableRenderer;
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21 import java.io.StringWriter;
22 import java.io.PrintWriter;
23 import java.io.LineNumberReader;
24 import java.io.StringReader;
25 import java.io.IOException;
26 import java.io.InterruptedIOException;
27 import java.util.ArrayList;
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35 public final class DefaultThrowableRenderer implements ThrowableRenderer {
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39 public DefaultThrowableRenderer() {
40
41 }
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47 public String[] doRender(final Throwable throwable) {
48 return render(throwable);
49 }
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56 public static String[] render(final Throwable throwable) {
57 StringWriter sw = new StringWriter();
58 PrintWriter pw = new PrintWriter(sw);
59 try {
60 throwable.printStackTrace(pw);
61 } catch(RuntimeException ex) {
62 }
63 pw.flush();
64 LineNumberReader reader = new LineNumberReader(
65 new StringReader(sw.toString()));
66 ArrayList lines = new ArrayList();
67 try {
68 String line = reader.readLine();
69 while(line != null) {
70 lines.add(line);
71 line = reader.readLine();
72 }
73 } catch(IOException ex) {
74 if (ex instanceof InterruptedIOException) {
75 Thread.currentThread().interrupt();
76 }
77 lines.add(ex.toString());
78 }
79 String[] tempRep = new String[lines.size()];
80 lines.toArray(tempRep);
81 return tempRep;
82 }
83 }