hessianinput.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 "Hessian", "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.hessian.io;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;

/**
 * Input stream for Hessian requests.
 *
 * <p>HessianInput is unbuffered, so any client needs to provide
 * its own buffering.
 *
 * <pre>
 * InputStream is = ...; // from http connection
 * HessianInput in = new HessianInput(is);
 * String value;
 *
 * in.startReply();         // read reply header
 * value = in.readString(); // read string value
 * in.completeReply();      // read reply footer
 * </pre>
 */
public class HessianInput extends AbstractHessianInput {
  private static int END_OF_DATA = -2;

  private static Field _detailMessageField;
  
  // factory for deserializing objects in the input stream
  protected SerializerFactory _serializerFactory;
  
  protected ArrayList _refs;
  
  // the underlying input stream
  private InputStream _is;
  // a peek character
  protected int _peek = -1;
  
  // the method for a call
  private String _method;

  private Reader _chunkReader;
  private InputStream _chunkInputStream;

  private Throwable _replyFault;

  private StringBuffer _sbuf = new StringBuffer();
  
  // true if this is the last chunk
  private boolean _isLastChunk;
  // the chunk length
  private int _chunkLength;

  /**
   * Creates an uninitialized Hessian input stream.
   */
  public HessianInput()
  {
  }
  
  /**
   * Creates a new Hessian input stream, initialized with an
   * underlying input stream.
   *
   * @param is the underlying input stream.
   */
  public HessianInput(InputStream is)
  {
    init(is);
  }

  /**
   * Sets the serializer factory.
   */
  public void setSerializerFactory(SerializerFactory factory)
  {
    _serializerFactory = factory;
  }

  /**
   * Gets the serializer factory.
   */
  public SerializerFactory getSerializerFactory()
  {
    return _serializerFactory;
  }

  /**
   * Initialize the hessian stream with the underlying input stream.
   */
  public void init(InputStream is)
  {
    _is = is;
    _method = null;
    _isLastChunk = true;
    _chunkLength = 0;
    _peek = -1;
    _refs = null;
    _replyFault = null;

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

  /**
   * Returns the calls method
   */
  public String getMethod()
  {
    return _method;
  }

  /**
   * Returns any reply fault.
   */
  public Throwable getReplyFault()
  {
    return _replyFault;
  }

  /**
   * Starts reading the call
   *
   * <pre>
   * c major minor
   * </pre>
   */
  public int readCall()
    throws IOException
  {
    int tag = read();
    
    if (tag != 'c')
      throw error("expected hessian call ('c') at " + codeName(tag));

    int major = read();
    int minor = read();

    return (major << 16) + minor;
  }

  /**
   * For backward compatibility with HessianSkeleton
   */
  public void skipOptionalCall()
    throws IOException
  {
    int tag = read();

    if (tag == 'c') {
      read();
      read();
    }
    else
      _peek = tag;
  }

  /**
   * Starts reading the call
   *
   * <p>A successful completion will have a single value:
   *
   * <pre>
   * m b16 b8 method
   * </pre>
   */
  public String readMethod()
    throws IOException
  {
    int tag = read();
    
    if (tag != 'm')
      throw error("expected hessian method ('m') at " + codeName(tag));
    int d1 = read();
    int d2 = read();

    _isLastChunk = true;
    _chunkLength = d1 * 256 + d2;
    _sbuf.setLength(0);
    int ch;
    while ((ch = parseChar()) >= 0)
      _sbuf.append((char) ch);
    
    _method = _sbuf.toString();

    return _method;
  }

  /**
   * Starts reading the call, including the headers.
   *
   * <p>The call expects the following protocol data
   *
   * <pre>
   * c major minor
   * m b16 b8 method
   * </pre>
   */
  public void startCall()
    throws IOException
  {
    readCall();

    while (readHeader() != null) {
      readObject();
    }

    readMethod();
  }

  /**
   * Completes reading the call
   *
   * <p>A successful completion will have a single value:
   *
   * <pre>
   * z
   * </pre>
   */
  public void completeCall()
    throws IOException
  {
    int tag = read();

    if (tag == 'z') {
    }
    else
      throw error("expected end of call ('z') at " + codeName(tag) + ".  Check method arguments and ensure method overloading is enabled if necessary");
  }

  /**
   * Reads a reply as an object.
   * If the reply has a fault, throws the exception.
   */
  public Object readReply(Class expectedClass)
    throws Throwable
  {
    int tag = read();
    
    if (tag != 'r')
      error("expected hessian reply at " + codeName(tag));

    int major = read();
    int minor = read();

    tag = read();
    if (tag == 'f')
      throw prepareFault();
    else {
      _peek = tag;
    
      Object value = readObject(expectedClass);

      completeValueReply();

      return value;
    }
  }

  /**
   * Starts reading the reply
   *
   * <p>A successful completion will have a single value:
   *
   * <pre>
   * r
   * </pre>
   */
  public void startReply()
    throws Throwable
  {
    int tag = read();
    
    if (tag != 'r')
      error("expected hessian reply at " + codeName(tag));

    int major = read();
    int minor = read();
    
    tag = read();
    if (tag == 'f')
      throw prepareFault();
    else
      _peek = tag;
  }

  /**
   * Prepares the fault.
   */
  private Throwable prepareFault()
    throws IOException
  {
    HashMap fault = readFault();

    Object detail = fault.get("detail");
    String message = (String) fault.get("message");

    if (detail instanceof Throwable) {
      _replyFault = (Throwable) detail;
      
      if (message != null && _detailMessageField != null) {
	try {
	  _detailMessageField.set(_replyFault, message);
	} catch (Throwable e) {
	}
      }
	
      return _replyFault;
    }

    else {
      String code = (String) fault.get("code");
        
      _replyFault = new HessianServiceException(message, code, detail);

      return _replyFault;
    }
  }

  /**
   * Completes reading the call
   *
   * <p>A successful completion will have a single value:
   *
   * <pre>
   * z
   * </pre>
   */
  public void completeReply()
    throws IOException
  {
    int tag = read();
    
    if (tag != 'z')
      error("expected end of reply at " + codeName(tag));
  }

  /**
   * Completes reading the call
   *
   * <p>A successful completion will have a single value:
   *
   * <pre>
   * z
   * </pre>
   */
  public void completeValueReply()
    throws IOException
  {
    int tag = read();
    
    if (tag != 'z')
      error("expected end of reply at " + codeName(tag));
  }

  /**
   * Reads a header, returning null if there are no headers.
   *
   * <pre>
   * H b16 b8 value
   * </pre>
   */
  public String readHeader()
    throws IOException
  {
    int tag = read();

    if (tag == 'H') {
      _isLastChunk = true;
      _chunkLength = (read() << 8) + read();

      _sbuf.setLength(0);
      int ch;
      while ((ch = parseChar()) >= 0)
        _sbuf.append((char) ch);

      return _sbuf.toString();
    }

    _peek = tag;

    return null;
  }

  /**
   * Reads a null
   *
   * <pre>
   * N
   * </pre>
   */
  public void readNull()
    throws IOException
  {
    int tag = read();

    switch (tag) {
    case 'N': return;
      
    default:
      throw expect("null", tag);
    }
  }

  /**
   * Reads a boolean
   *
   * <pre>
   * T
   * F
   * </pre>
   */
  public boolean readBoolean()
    throws IOException
  {
    int tag = read();

    switch (tag) {
    case 'T': return true;
    case 'F': return false;
    case 'I': return parseInt() == 0;
    case 'L': return parseLong() == 0;
    case 'D': return parseDouble() == 0.0;
    case 'N': return false;
      
    default:
      throw expect("boolean", tag);
    }
  }

  /**
   * Reads a byte
   *
   * <pre>
   * I b32 b24 b16 b8
   * </pre>
   */
  /*
  public byte readByte()
    throws IOException
  {
    return (byte) readInt();
  }
  */

  /**
   * Reads a short
   *
   * <pre>
   * I b32 b24 b16 b8
   * </pre>
   */
  public short readShort()
    throws IOException
  {
    return (short) readInt();
  }

  /**
   * Reads an integer
   *
   * <pre>
   * I b32 b24 b16 b8
   * </pre>
   */
  public int readInt()
    throws IOException
  {
    int tag = read();

    switch (tag) {
    case 'T': return 1;
    case 'F': return 0;
    case 'I': return parseInt();
    case 'L': return (int) parseLong();
    case 'D': return (int) parseDouble();
      
    default:
      throw expect("int", tag);
    }
  }

  /**
   * Reads a long
   *
   * <pre>
   * L b64 b56 b48 b40 b32 b24 b16 b8
   * </pre>
   */
  public long readLong()
    throws IOException
  {
    int tag = read();

    switch (tag) {
    case 'T': return 1;
    case 'F': return 0;
    case 'I': return parseInt();
    case 'L': return parseLong();
    case 'D': return (long) parseDouble();
      
    default:
      throw expect("long", tag);
    }
  }

  /**
   * Reads a float
   *
   * <pre>
   * D b64 b56 b48 b40 b32 b24 b16 b8
   * </pre>
   */
  public float readFloat()
    throws IOException