protocol.java

已经移植好的java虚拟机

/*
 *  Copyright (c) 1999 Sun Microsystems, Inc., 901 San Antonio Road,
 *  Palo Alto, CA 94303, U.S.A.  All Rights Reserved.
 *
 *  Sun Microsystems, Inc. has intellectual property rights relating
 *  to the technology embodied in this software.  In particular, and
 *  without limitation, these intellectual property rights may include
 *  one or more U.S. patents, foreign patents, or pending
 *  applications.  Sun, Sun Microsystems, the Sun logo, Java, KJava,
 *  and all Sun-based and Java-based marks are trademarks or
 *  registered trademarks of Sun Microsystems, Inc.  in the United
 *  States and other countries.
 *
 *  This software is distributed under licenses restricting its use,
 *  copying, distribution, and decompilation.  No part of this
 *  software may be reproduced in any form by any means without prior
 *  written authorization of Sun and its licensors, if any.
 *
 *  FEDERAL ACQUISITIONS:  Commercial Software -- Government Users
 *  Subject to Standard License Terms and Conditions
 */

/*
 * WARNING - THIS IS AN EXPERIMENTAL FEATURE OF KVM THAT MAY, OR MAY NOT
 * EXIST IN A FUTURE VERSION OF THIS PRODUCT. IT IS NOT A PART OF THE
 * CLDC SPECIFICATION AND IS PROVIDED FOR ILLUSTRATIVE PURPOSES ONLY
 */

package com.sun.cldc.io.j2se.http;

import java.io.*;
import java.net.*;
import javax.microedition.io.*;
import com.sun.cldc.io.j2se.*;

/**
 * HTTP connection for J2SE.
 *
 * @author  Nik Shaylor
 * @version 1.0 01/03/2000
 */

public class Protocol extends com.sun.cldc.io.ConnectionBase implements ContentConnection {

    /** URL Connection object */
    URLConnection conn = null;

    /**
     * Open the http connection
     * @param name the target for the connection
     * @param mode The access mode
     * @param timeouts A flag to indicate that the called wants timeout exceptions
     * <p>
     * The name string for this protocol should be:
     * "<name or IP number>:<port number>
     */
    public void open(String name, int mode, boolean timeouts) throws IOException {

        if(name.charAt(0) != '/' || name.charAt(1) != '/') {
            throw new IllegalArgumentException("Protocol must start with \"//\" "+name);
        }

        name = name.substring(2);

        URL url = new URL(name);
        conn = url.openConnection();
        conn.connect();
    }

    /**
     * Returns an input stream for this socket.
     *
     * @return     an input stream for reading bytes from this socket.
     * @exception  IOException  if an I/O error occurs when creating the
     *                          input stream.
     */
    public InputStream openInputStream() throws IOException {
        return new UniversalFilterInputStream(this, conn.getInputStream());
    }

    /**
     * Returns an output stream for this socket.
     *
     * @return     an output stream for writing bytes to this socket.
     * @exception  IOException  if an I/O error occurs when creating the
     *                          output stream.
     */
    public OutputStream openOutputStream() throws IOException {
        return new UniversalFilterOutputStream(this, conn.getOutputStream());
    }
    /**
     * Returns the value of the <code>content-type</code> header field.
     *
     * @return  the content type of the resource that the URL references,
     *          or <code>null</code> if not known.
     */
    public String getType() {
        return conn.getContentType();
    }

    /**
     * Returns the value of the <code>content-encoding</code> header field.
     *
     * @return  the content encoding of the resource that the URL references,
     *          or <code>null</code> if not known.
     */
    public String getEncoding() {
        return conn.getContentEncoding();
    }

    /*
     * Returns the contents of the specified header field.
     *
     * @param   name   the name of a header field.
     * @return  the value of the named header field, or <code>null</code>
     *          if there is no such field in the header.
     */
    public String getHeaderField(String name) {
        return conn.getHeaderField(name);
    }

    /**
     * Returns the value of the <code>content-length</code> header field.
     *
     * @return  the content length of the resource that this connection's URL
     *          references, or <code>-1</code> if the content length is
     *          not known.
     */
    public long getLength() {
        return conn.getContentLength();
    }

    /**
     * Close the connection.
     *
     * @exception  IOException  if an I/O error occurs when closing the
     *                          connection.
     */
    public void close() throws IOException {
    }

}