internetprintwriter.java

基于UDP的可靠邮件系统

/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * All rights reserved.                                                *
 * ------------------------------------------------------------------- *
 * Licensed under the Apache License, Version 2.0 (the "License"); you *
 * may not use this file except in compliance with the License. You    *
 * may obtain a copy of the License at:                                *
 *                                                                     *
 *     http://www.apache.org/licenses/LICENSE-2.0                      *
 *                                                                     *
 * Unless required by applicable law or agreed to in writing, software *
 * distributed under the License is distributed on an "AS IS" BASIS,   *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or     *
 * implied.  See the License for the specific language governing       *
 * permissions and limitations under the License.                      *
 ***********************************************************************/

package org.hwmhere.email.impl.util;

import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;

/**
 * Writes to a wrapped Writer class, ensuring that all line separators are '\r\n', regardless
 * of platform.
 */
public class InternetPrintWriter
    extends PrintWriter {

    /**
     * The line separator to use.
     */
    private static String lineSeparator = "\r\n";

    /**
     * Whether the Writer autoflushes on line feeds
     */
    private final boolean autoFlush;

    /**
     * Constructor that takes a writer to wrap.
     *
     * @param out the wrapped Writer
     */
    public InternetPrintWriter (Writer out) {
        super (out);
        autoFlush = false;
    }

    /**
     * Constructor that takes a writer to wrap.
     *
     * @param out the wrapped Writer
     * @param autoFlush whether to flush after each print call
     */
    public InternetPrintWriter (Writer out, boolean autoFlush) {
        super (out, autoFlush);
        this.autoFlush = autoFlush;
    }

    /**
     * Constructor that takes a stream to wrap.
     *
     * @param out the wrapped OutputStream
     */
    public InternetPrintWriter (OutputStream out) {
        super (out);
        autoFlush = false;
    }

    /**
     * Constructor that takes a stream to wrap.
     *
     * @param out the wrapped OutputStream
     * @param autoFlush whether to flush after each print call
     */
    public InternetPrintWriter (OutputStream out, boolean autoFlush) {
        super (out, autoFlush);
        this.autoFlush = autoFlush;
    }

    /**
     * Print a line separator.
     */
    public void println () {
        synchronized (lock) {
            write(lineSeparator);
            if (autoFlush) {
                flush();
            }
        }
    }

    /**
     * Print a boolean followed by a line separator.
     *
     * @param x the boolean to print
     */
    public void println(boolean x) {
        synchronized (lock) {
            print(x);
            println();
        }
    }

    /**
     * Print a char followed by a line separator.
     *
     * @param x the char to print
     */
    public void println(char x) {
        synchronized (lock) {
            print (x);
            println ();
        }
    }

    /**
     * Print a int followed by a line separator.
     *
     * @param x the int to print
     */
    public void println (int x) {
        synchronized (lock) {
            print (x);
            println ();
        }
    }

    /**
     * Print a long followed by a line separator.
     *
     * @param x the long to print
     */
    public void println (long x) {
        synchronized (lock) {
            print (x);
            println ();
        }
    }

    /**
     * Print a float followed by a line separator.
     *
     * @param x the float to print
     */
    public void println (float x) {
        synchronized (lock) {
            print (x);
            println ();
        }
    }

    /**
     * Print a double followed by a line separator.
     *
     * @param x the double to print
     */
    public void println (double x) {
        synchronized (lock) {
            print (x);
            println ();
        }
    }

    /**
     * Print a character array followed by a line separator.
     *
     * @param x the character array to print
     */
    public void println (char[] x) {
        synchronized (lock) {
            print (x);
            println ();
        }
    }

    /**
     * Print a String followed by a line separator.
     *
     * @param x the String to print
     */
    public void println (String x) {
        synchronized (lock) {
            print (x);
            println ();
        }
    }

    /**
     * Print an Object followed by a line separator.
     *
     * @param x the Object to print
     */
    public void println (Object x) {
        synchronized (lock) {
            print (x);
            println ();
        }
    }
}