burlapoutput.java

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/*
 * Copyright (c) 2001-2004 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * 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
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Burlap", "Resin", and "Caucho" 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 "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * 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 CAUCHO TECHNOLOGY 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.
 *
 * @author Scott Ferguson
 */

package com.caucho.burlap.io;

import com.caucho.hessian.io.Serializer;
import com.caucho.hessian.io.SerializerFactory;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Calendar;
import java.util.Date;
import java.util.IdentityHashMap;
import java.util.TimeZone;

/**
 * Output stream for Burlap requests, compatible with microedition
 * Java.  It only uses classes and types available in JDK.
 *
 * <p>Since BurlapOutput does not depend on any classes other than
 * in the JDK, it can be extracted independently into a smaller package.
 *
 * <p>BurlapOutput is unbuffered, so any client needs to provide
 * its own buffering.
 *
 * <pre>
 * OutputStream os = ...; // from http connection
 * BurlapOutput out = new BurlapOutput(os);
 * String value;
 *
 * out.startCall("hello");  // start hello call
 * out.writeString("arg1"); // write a string argument
 * out.completeCall();      // complete the call
 * </pre>
 */
public class BurlapOutput extends AbstractBurlapOutput {
  // the output stream
  protected OutputStream os;
  // map of references
  private IdentityHashMap _refs;

  private Date date;
  private Calendar utcCalendar;
  private Calendar localCalendar;
  /**
   * Creates a new Burlap output stream, initialized with an
   * underlying output stream.
   *
   * @param os the underlying output stream.
   */
  public BurlapOutput(OutputStream os)
  {
    init(os);
  }

  /**
   * Creates an uninitialized Burlap output stream.
   */
  public BurlapOutput()
  {
  }

  /**
   * Initializes the output
   */
  public void init(OutputStream os)
  {
    this.os = os;

    _refs = null;

    if (_serializerFactory == null)
      _serializerFactory = new SerializerFactory();
  }

  /**
   * Writes a complete method call.
   */
  public void call(String method, Object []args)
    throws IOException
  {
    startCall(method);
    
    if (args != null) {
      for (int i = 0; i < args.length; i++)
        writeObject(args[i]);
    }
    
    completeCall();
  }

  /**
   * Starts the method call.  Clients would use <code>startCall</code>
   * instead of <code>call</code> if they wanted finer control over
   * writing the arguments, or needed to write headers.
   *
   * <code><pre>
   * &lt;burlap:call>
   * &lt;method>method-name&lt;/method>
   * </pre></code>
   *
   * @param method the method name to call.
   */
  public void startCall(String method)
    throws IOException
  {
    print("<burlap:call><method>");
    print(method);
    print("</method>");
  }

  /**
   * Starts the method call.  Clients would use <code>startCall</code>
   * instead of <code>call</code> if they wanted finer control over
   * writing the arguments, or needed to write headers.
   *
   * <code><pre>
   * &lt;method>method-name&lt;/method>
   * </pre></code>
   *
   * @param method the method name to call.
   */
  public void startCall()
    throws IOException
  {
    print("<burlap:call>");
  }

  /**
   * Writes the method for a call.
   *
   * <code><pre>
   * &lt;method>value&lt;/method>
   * </pre></code>
   *
   * @param method the method name to call.
   */
  public void writeMethod(String method)
    throws IOException
  {
    print("<method>");
    print(method);
    print("</method>");
  }
  

  /**
   * Completes.
   *
   * <code><pre>
   * &lt;/burlap:call>
   * </pre></code>
   */
  public void completeCall()
    throws IOException
  {
    print("</burlap:call>");
  }

  /**
   * Starts the reply
   *
   * <p>A successful completion will have a single value:
   *
   * <pre>
   * r
   * </pre>
   */
  public void startReply()
    throws IOException
  {
    print("<burlap:reply>");
  }

  /**
   * Completes reading the reply
   *
   * <p>A successful completion will have a single value:
   *
   * <pre>
   * &lt;/burlap:reply>
   * </pre>
   */
  public void completeReply()
    throws IOException
  {
    print("</burlap:reply>");
  }

  /**
   * Writes a header name.  The header value must immediately follow.
   *
   * <code><pre>
   * &lt;header>foo&lt;/header>&lt;int>value&lt;/int>
   * </pre></code>
   */
  public void writeHeader(String name)
    throws IOException
  {
    print("<header>");
    printString(name);
    print("</header>");
  }

  /**
   * Writes a fault.  The fault will be written
   * as a descriptive string followed by an object:
   *
   * <code><pre>
   * &lt;fault>
   * &lt;string>code
   * &lt;string>the fault code
   *
   * &lt;string>message
   * &lt;string>the fault mesage
   *
   * &lt;string>detail
   * &lt;map>t\x00\xnnjavax.ejb.FinderException
   *     ...
   * &lt;/map>
   * &lt;/fault>
   * </pre></code>
   *
   * @param code the fault code, a three digit
   */
  public void writeFault(String code, String message, Object detail)
    throws IOException
  {
    print("<fault>");
    writeString("code");
    writeString(code);

    writeString("message");
    writeString(message);

    if (detail != null) {
      writeString("detail");
      writeObject(detail);
    }
    print("</fault>");
  }

  /**
   * Writes any object to the output stream.
   */
  public void writeObject(Object object)
    throws IOException
  {
    if (object == null) {
      writeNull();
      return;
    }

    Serializer serializer;

    serializer = _serializerFactory.getSerializer(object.getClass());

    serializer.writeObject(object, this);
  }

  /**
   * Writes the list header to the stream.  List writers will call
   * <code>writeListBegin</code> followed by the list contents and then
   * call <code>writeListEnd</code>.
   *
   * <code><pre>
   * &lt;list>
   *   &lt;type>java.util.ArrayList&lt;/type>
   *   &lt;length>3&lt;/length>
   *   &lt;int>1&lt;/int>
   *   &lt;int>2&lt;/int>
   *   &lt;int>3&lt;/int>
   * &lt;/list>
   * </pre></code>
   */
  public boolean writeListBegin(int length, String type)
    throws IOException
  {
    print("<list><type>");
    
    if (type != null)
      print(type);
    
    print("</type><length>");
    print(length);
    print("</length>");

    return true;
  }

  /**
   * Writes the tail of the list to the stream.
   */
  public void writeListEnd()
    throws IOException
  {
    print("</list>");
  }

  /**
   * Writes the map header to the stream.  Map writers will call
   * <code>writeMapBegin</code> followed by the map contents and then
   * call <code>writeMapEnd</code>.
   *
   * <code><pre>
   * &lt;map>
   *   &lt;type>type&lt;/type>
   *   (&lt;key> &lt;value>)*
   * &lt;/map>
   * </pre></code>
   */
  public void writeMapBegin(String type)
    throws IOException
  {
    print("<map><type>");
    if (type != null)
      print(type);
    
    print("</type>");
  }

  /**
   * Writes the tail of the map to the stream.
   */
  public void writeMapEnd()
    throws IOException
  {
    print("</map>");
  }

  /**
   * Writes a remote object reference to the stream.  The type is the
   * type of the remote interface.
   *
   * <code><pre>
   * &lt;remote>
   *   &lt;type>test.account.Account&lt;/type>
   *   &lt;string>http://caucho.com/foo;ejbid=bar&lt;/string>
   * &lt;/remote>
   * </pre></code>
   */
  public void writeRemote(String type, String url)
    throws IOException
  {
    print("<remote><type>");
    print(type);
    print("</type><string>");
    print(url);
    print("</string></remote>");
  }

  /**
   * Writes a boolean value to the stream.  The boolean will be written
   * with the following syntax:
   *
   * <code><pre>
   * &lt;boolean>0&lt;/boolean>
   * &lt;boolean>1&lt;/boolean>
   * </pre></code>
   *
   * @param value the boolean value to write.
   */
  public void writeBoolean(boolean value)
    throws IOException
  {
    if (value)
      print("<boolean>1</boolean>");
    else
      print("<boolean>0</boolean>");
  }

  /**
   * Writes an integer value to the stream.  The integer will be written
   * with the following syntax:
   *
   * <code><pre>
   * &lt;int>int value&lt;/int>
   * </pre></code>
   *
   * @param value the integer value to write.
   */
  public void writeInt(int value)
    throws IOException
  {
    print("<int>");
    print(value);
    print("</int>");
  }

  /**
   * Writes a long value to the stream.  The long will be written
   * with the following syntax:
   *
   * <code><pre>
   * &lt;long>int value&lt;/long>
   * </pre></code>
   *
   * @param value the long value to write.
   */
  public void writeLong(long value)
    throws IOException
  {
    print("<long>");
    print(value);
    print("</long>");
  }

  /**
   * Writes a double value to the stream.  The double will be written
   * with the following syntax:
   *
   * <code><pre>
   * &lt;double>value&lt;/double>
   * </pre></code>
   *
   * @param value the double value to write.
   */
  public void writeDouble(double value)
    throws IOException
  {
    print("<double>");
    print(value);
    print("</double>");
  }

  /**
   * Writes a date to the stream.
   *
   * <code><pre>
   * &lt;date>iso8901&lt;/date>
   * </pre></code>
   *
   * @param time the date in milliseconds from the epoch in UTC
   */
  public void writeUTCDate(long time)
    throws IOException
  {
    print("<date>");