org.apache.jasper.util.SystemLogHandler Maven / Gradle / Ivy
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package org.apache.jasper.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
/**
* This helper class may be used to do sophisticated redirection of
* System.out and System.err.
*
* @author Remy Maucherat
*/
public class SystemLogHandler extends PrintStream {
// ----------------------------------------------------------- Constructors
/**
* Construct the handler to capture the output of the given steam.
*/
public SystemLogHandler(PrintStream wrapped) {
super(wrapped);
this.wrapped = wrapped;
}
// ----------------------------------------------------- Instance Variables
/**
* Wrapped PrintStream.
*/
protected PrintStream wrapped = null;
/**
* Thread <-> PrintStream associations.
*/
protected static final ThreadLocal streams = new ThreadLocal();
/**
* Thread <-> ByteArrayOutputStream associations.
*/
protected static final ThreadLocal data = new ThreadLocal();
// --------------------------------------------------------- Public Methods
public PrintStream getWrapped() {
return wrapped;
}
/**
* Start capturing thread's output.
*/
public static void setThread() {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
data.set(baos);
streams.set(new PrintStream(baos));
}
/**
* Stop capturing thread's output and return captured data as a String.
*/
public static String unsetThread() {
ByteArrayOutputStream baos =
(ByteArrayOutputStream) data.get();
if (baos == null) {
return null;
}
streams.set(null);
data.set(null);
return baos.toString();
}
// ------------------------------------------------------ Protected Methods
/**
* Find PrintStream to which the output must be written to.
*/
protected PrintStream findStream() {
PrintStream ps = (PrintStream) streams.get();
if (ps == null) {
ps = wrapped;
}
return ps;
}
// ---------------------------------------------------- PrintStream Methods
public void flush() {
findStream().flush();
}
public void close() {
findStream().close();
}
public boolean checkError() {
return findStream().checkError();
}
protected void setError() {
//findStream().setError();
}
public void write(int b) {
findStream().write(b);
}
public void write(byte[] b)
throws IOException {
findStream().write(b);
}
public void write(byte[] buf, int off, int len) {
findStream().write(buf, off, len);
}
public void print(boolean b) {
findStream().print(b);
}
public void print(char c) {
findStream().print(c);
}
public void print(int i) {
findStream().print(i);
}
public void print(long l) {
findStream().print(l);
}
public void print(float f) {
findStream().print(f);
}
public void print(double d) {
findStream().print(d);
}
public void print(char[] s) {
findStream().print(s);
}
public void print(String s) {
findStream().print(s);
}
public void print(Object obj) {
findStream().print(obj);
}
public void println() {
findStream().println();
}
public void println(boolean x) {
findStream().println(x);
}
public void println(char x) {
findStream().println(x);
}
public void println(int x) {
findStream().println(x);
}
public void println(long x) {
findStream().println(x);
}
public void println(float x) {
findStream().println(x);
}
public void println(double x) {
findStream().println(x);
}
public void println(char[] x) {
findStream().println(x);
}
public void println(String x) {
findStream().println(x);
}
public void println(Object x) {
findStream().println(x);
}
}