coyotewriter.java

Tomcat 4.1与WebServer集成组件的源代码包.

/*
 * ====================================================================
 * 
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 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", "Tomcat", 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 [e-mail].
 *
 * 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/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */ 


package org.apache.coyote.tomcat4;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletOutputStream;

/**
 * Coyote implementation of the servlet writer.
 * 
 * @author Remy Maucherat
 */
final class CoyoteWriter
    extends PrintWriter {


    // -------------------------------------------------------------- Constants


    private static final char[] LINE_SEP = { '\r', '\n' };


    // ----------------------------------------------------- Instance Variables


    protected OutputBuffer ob;
    protected boolean error = false;


    // ----------------------------------------------------------- Constructors


    public CoyoteWriter(OutputBuffer ob) {
        super(ob);
        this.ob = ob;
    }


    // -------------------------------------------------------- Package Methods


    /**
     * Recycle.
     */
    void recycle() {
        error = false;
    }


    // --------------------------------------------------------- Writer Methods


    public void flush() {

        if (error)
            return;

        try {
            ob.flush();
        } catch (IOException e) {
            error = true;
        }

    }


    public void close() {

        // We don't close the PrintWriter - super() is not called,
        // so the stream can be reused. We close ob.
        try {
            ob.close();
        } catch (IOException ex ) {
            ;
        }
        error = false;

    }


    public boolean checkError() {
        flush();
        return error;
    }


    public void write(int c) {

        if (error)
            return;

        try {
            ob.write(c);
        } catch (IOException e) {
            error = true;
        }

    }


    public void write(char buf[], int off, int len) {

        if (error)
            return;

        try {
            ob.write(buf, off, len);
        } catch (IOException e) {
            error = true;
        }

    }


    public void write(char buf[]) {
	write(buf, 0, buf.length);
    }


    public void write(String s, int off, int len) {

        if (error)
            return;

        try {
            ob.write(s, off, len);
        } catch (IOException e) {
            error = true;
        }

    }


    public void write(String s) {
        write(s, 0, s.length());
    }


    // ---------------------------------------------------- PrintWriter Methods


    public void print(boolean b) {
        if (b) {
            write("true");
        } else {
            write("false");
        }
    }


    public void print(char c) {
        write(c);
    }


    public void print(int i) {
        write(String.valueOf(i));
    }


    public void print(long l) {
        write(String.valueOf(l));
    }


    public void print(float f) {
        write(String.valueOf(f));
    }


    public void print(double d) {
        write(String.valueOf(d));
    }


    public void print(char s[]) {
        write(s);
    }


    public void print(String s) {
        if (s == null) {
            s = "null";
        }
        write(s);
    }


    public void print(Object obj) {
        write(String.valueOf(obj));
    }


    public void println() {
        write(LINE_SEP);
    }


    public void println(boolean b) {
        print(b);
        println();
    }


    public void println(char c) {
        print(c);
        println();
    }


    public void println(int i) {
        print(i);
        println();
    }


    public void println(long l) {
        print(l);
        println();
    }


    public void println(float f) {
        print(f);
        println();
    }


    public void println(double d) {
        print(d);
        println();
    }


    public void println(char c[]) {
        print(c);
        println();
    }


    public void println(String s) {
        print(s);
        println();
    }


    public void println(Object o) {
        print(o);
        println();
    }


}