microburlapoutput.java

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/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001-2004 Caucho Technology, Inc.  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
 *        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.client;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Calendar;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.TimeZone;
import java.util.Vector;

/**
 * Output stream for Burlap requests, compatible with microedition
 * Java.  It only uses classes and types available to J2ME.  In
 * particular, it does not have any support for the <double> type.
 *
 * <p>MicroBurlapOutput does not depend on any classes other than
 * in J2ME, so it can be extracted independently into a smaller package.
 *
 * <p>MicroBurlapOutput is unbuffered, so any client needs to provide
 * its own buffering.
 *
 * <pre>
 * OutputStream os = ...; // from http connection
 * MicroBurlapOutput out = new MicroBurlapOutput(os);
 * String value;
 *
 * out.startCall("hello");  // start hello call
 * out.writeString("arg1"); // write a string argument
 * out.completeCall();      // complete the call
 * </pre>
 */
public class MicroBurlapOutput {
  private OutputStream os;
  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 MicroBurlapOutput(OutputStream os)
  {
    init(os);
  }

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

  public void init(OutputStream os)
  {
    this.os = os;
  }

  /**
   * 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();
  }

  /**
   * Writes the method call:
   *
   * <code><pre>
   * &lt;burlap:request>
   *   &lt;method>add&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>");
  }

  /**
   * Writes the method call:
   *
   * <code><pre>
   * &lt;/burlap:request>
   * </pre></code>
   */
  public void completeCall()
    throws IOException
  {
    print("</burlap:call>");
  }

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

  /**
   * Writes an integer value to the stream.  The integer will be written
   * with the following syntax:
   *
   * <code><pre>
   * &lt;int>123&lt;/int>
   * </pre></code>
   *
   * @param value the integer value to write.
   */
  public void writeInt(int value)
    throws IOException
  {
    print("<int>");
    printInt(value);
    print("</int>");
  }

  /**
   * Writes a long value to the stream.  The long will be written
   * with the following syntax:
   *
   * <code><pre>
   * &lt;long>123&lt;/long>
   * </pre></code>
   *
   * @param value the long value to write.
   */
  public void writeLong(long value)
    throws IOException
  {
    print("<long>");
    printLong(value);
    print("</long>");
  }

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

  /**
   * Writes a string value to the stream using UTF-8 encoding.
   * The string will be written with the following syntax:
   *
   * <code><pre>
   * &lt;string>12.3e10&lt;/string>
   * </pre></code>
   *
   * If the value is null, it will be written as
   *
   * <code><pre>
   * &lt;null>&lt;/null>
   * </pre></code>
   *
   * @param value the string value to write.
   */
  public void writeString(String value)
    throws IOException
  {
    if (value == null) {
      print("<null></null>");
    }
    else {
      print("<string>");
      printString(value);
      print("</string>");
    }
  }

  /**
   * Writes a byte array to the stream using base64 encoding.
   * The array will be written with the following syntax:
   *
   * <code><pre>
   * &lt;base64>dJmO==&lt;/base64>
   * </pre></code>
   *
   * If the value is null, it will be written as
   *
   * <code><pre>
   * &lt;null>&lt;/null>
   * </pre></code>
   *
   * @param value the string value to write.
   */
  public void writeBytes(byte []buffer, int offset, int length)
    throws IOException
  {
    if (buffer == null) {
      print("<null></null>");
    }
    else {
      print("<base64>");
      printBytes(buffer, offset, length);
      print("</base64>");
    }
  }

  /**
   * Writes a date to the stream using ISO8609.
   *
   * <code><pre>
   * &lt;date>19980508T095131Z&lt;/date>
   * </pre></code>
   *
   * @param value the date in milliseconds from the epoch in UTC
   */
  public void writeUTCDate(long time)
    throws IOException
  {
    print("<date>");
    if (utcCalendar == null) {
      utcCalendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
      date = new Date();
    }

    date.setTime(time);
    utcCalendar.setTime(date);

    printDate(utcCalendar);
    print("</date>");
  }

  /**
   * Writes a date to the stream using ISO8609.
   *
   * <code><pre>
   * &lt;date>19980508T095131Z&lt;/date>
   * </pre></code>
   *
   * @param value the date in milliseconds from the epoch in local timezone
   */
  public void writeLocalDate(long time)
    throws IOException
  {
    print("<date>");
    if (localCalendar == null) {
      localCalendar = Calendar.getInstance();
      date = new Date();
    }

    date.setTime(time);
    localCalendar.setTime(date);

    printDate(localCalendar);
    print("</date>");
  }

  /**
   * Writes a reference.
   *
   * <code><pre>
   * &lt;ref>123&lt;/ref>
   * </pre></code>
   *
   * @param value the integer value to write.
   */
  public void writeRef(int value)
    throws IOException
  {
    print("<ref>");
    printInt(value);