📄 servletcontextwriter.java
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/*
* $Header: /sfroot/cvs/esimple/src/core/org/apache/struts/util/ServletContextWriter.java,v 1.1.1.1 2004/09/08 06:38:44 lava Exp $
* $Revision: 1.1.1.1 $
* $Date: 2004/09/08 06:38:44 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Struts", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.struts.util;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.servlet.ServletContext;
/**
* A PrintWriter implementation that uses the logging facilities of a
* <code>javax.servlet.ServletContext</code> to output its results. Output
* will be buffered until a newline character is output, <code>flush()</code>
* is called, or until one of the <code>println()</code> methods is called.
* Along the way, carriage return characters are skipped.
*
* @author Craig R. McClanahan
* @version $Revision: 1.1.1.1 $ $Date: 2004/09/08 06:38:44 $
*/
public class ServletContextWriter extends PrintWriter {
// ----------------------------------------------------------- Constructors
/**
* Construct a ServletContextWriter associated with the specified
* ServletContext instance.
*
* @param context The associated servlet context
*/
public ServletContextWriter(ServletContext context) {
super(new StringWriter());
this.context = context;
}
// ------------------------------------------------------------- Properties
/**
* The buffer into which we accumulate lines to be logged.
*/
protected StringBuffer buffer = new StringBuffer();
/**
* The servlet context with which we are associated.
*/
protected ServletContext context = null;
/**
* The error state for this stream.
*/
protected boolean error = false;
// --------------------------------------------------------- Public Methods
/**
* Flush the stream and check for its error state. <strong>IMPLEMENTATION
* NOTE</strong> - our associated servlet context gives no indication of
* problems with logging, so the only way this method will return
* <code>true</code> is if <code>setError()</code> is called.
*/
public boolean checkError() {
flush();
return (error);
}
/**
* Close the stream.
*/
public void close() {
flush();
}
/**
* Flush the stream.
*/
public void flush() {
if (buffer.length() > 0) {
context.log(buffer.toString());
buffer.setLength(0);
}
}
/**
* Print a boolean value.
*
* @param b The value to be printed
*/
public void print(boolean b) {
write(String.valueOf(b));
}
/**
* Print a character value.
*
* @param c The value to be printed
*/
public void print(char c) {
write(c);
}
/**
* Print a character array.
*
* @param c The character array to be printed
*/
public void print(char c[]) {
for (int i = 0; i < c.length; i++)
write(c[i]);
}
/**
* Print a double value.
*
* @param d The value to be printed
*/
public void print(double d) {
write(String.valueOf(d));
}
/**
* Print a float value.
*
* @param f The value to be printed
*/
public void print(float f) {
write(String.valueOf(f));
}
/**
* Print an integer value.
*
* @param i The value to be printed
*/
public void print(int i) {
write(String.valueOf(i));
}
/**
* Print a long value.
*
* @param l The value to be printed
*/
public void print(long l) {
write(String.valueOf(l));
}
/**
* Print an object.
*
* @param o The value to be printed
*/
public void print(Object o) {
write(o.toString());
}
/**
* Print a String value.
*
* @param s The value to be printed
*/
public void print(String s) {
int len = s.length();
for (int i = 0; i < len; i++)
write(s.charAt(i));
}
/**
* Terminate the current line and flush the buffer.
*/
public void println() {
flush();
}
/**
* Print a boolean value and terminate the line.
*
* @param b The value to be printed
*/
public void println(boolean b) {
println(String.valueOf(b));
}
/**
* Print a character value and terminate the line.
*
* @param c The value to be printed
*/
public void println(char c) {
write(c);
println();
}
/**
* Print a character array and terminate the line.
*
* @param c The character array to be printed
*/
public void println(char c[]) {
for (int i = 0; i < c.length; i++)
print(c[i]);
println();
}
/**
* Print a double value and terminate the line.
*
* @param d The value to be printed
*/
public void println(double d) {
println(String.valueOf(d));
}
/**
* Print a float value and terminate the line.
*
* @param f The value to be printed
*/
public void println(float f) {
println(String.valueOf(f));
}
/**
* Print an integer value and terminate the line.
*
* @param i The value to be printed
*/
public void println(int i) {
println(String.valueOf(i));
}
/**
* Print a long value and terminate the line.
*
* @param l The value to be printed
*/
public void println(long l) {
println(String.valueOf(l));
}
/**
* Print an object and terminate the line.
*
* @param o The value to be printed
*/
public void println(Object o) {
println(o.toString());
}
/**
* Print a String value and terminate the line.
*
* @param s The value to be printed
*/
public void println(String s) {
int len = s.length();
for (int i = 0; i < len; i++)
print(s.charAt(i));
println();
}
/**
* Set the error state for this stream.
*/
public void setError() {
this.error = true;
}
/**
* Write a single character to this stream.
*
* @param c The character to be written
*/
public void write(char c) {
if (c == '\n')
flush();
else if (c != '\r')
buffer.append(c);
}
/**
* Write a single character to this stream.
*
* @param c The character to be written
*/
public void write(int c) {
write((char) c);
}
/**
* Write an array of charaters to this stream.
*
* @param buf The character array to be written
*/
public void write(char buf[]) {
for (int i = 0; i < buf.length; i++)
write(buf[i]);
}
/**
* Write the specified subset of an array of characters to this stream.
*
* @param buf The character array from which to write
* @param off The zero-relative starting offset to write
* @param len The number of characters to write
*/
public void write(char buf[], int off, int len) {
for (int i = off; i < len; i++)
write(buf[i]);
}
/**
* Write a String to this stream.
*
* @param s The string to be written
*/
public void write(String s) {
int len = s.length();
for (int i = 0; i < len; i++)
write(s.charAt(i));
}
/**
* Write the specified portion of a String to this stream.
*
* @param s The String from which to write
* @param off The zero-relative starting offset to write
* @param len The number of characters to write
*/
public void write(String s, int off, int len) {
for (int i = off; i < len; i++)
write(s.charAt(i));
}
}
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