ArrayDeserializer.java

/*
 * 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
 *    info@caucho.com.
 *
 * 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.hessian4.io;

import java.io.IOException;
import java.lang.reflect.Array;
import java.util.ArrayList;

/**
 * Deserializing a Java array
 */
public class ArrayDeserializer extends AbstractListDeserializer {
  private Class _componentType;
  private Class _type;
  
  public ArrayDeserializer(Class componentType)
  {
    _componentType = componentType;
    
    if (_componentType != null) {
      try {
        _type = Array.newInstance(_componentType, 0).getClass();
      } catch (Exception e) {
      }
    }

    if (_type == null)
      _type = Object[].class;
  }

  public Class getType()
  {
    return _type;
  }

  /**
   * Reads the array.
   */
  public Object readList(AbstractHessianInput in, int length)
    throws IOException
  {
    if (length >= 0) {
      Object []data = createArray(length);

      in.addRef(data);
      
      if (_componentType != null) {
        for (int i = 0; i < data.length; i++)
          data[i] = in.readObject(_componentType);
      }
      else {
        for (int i = 0; i < data.length; i++)
          data[i] = in.readObject();
      }

      in.readListEnd();

      return data;
    }
    else {
      ArrayList list = new ArrayList();

      in.addRef(list);

      if (_componentType != null) {
        while (! in.isEnd())
          list.add(in.readObject(_componentType));
      }
      else {
        while (! in.isEnd())
          list.add(in.readObject());
      }

      in.readListEnd();

      Object []data = createArray(list.size());
      for (int i = 0; i < data.length; i++)
        data[i] = list.get(i);

      return data;
    }
  }

  /**
   * Reads the array.
   */
  public Object readLengthList(AbstractHessianInput in, int length)
    throws IOException
  {
    Object []data = createArray(length);

    in.addRef(data);
      
    if (_componentType != null) {
      for (int i = 0; i < data.length; i++)
	data[i] = in.readObject(_componentType);
    }
    else {
      for (int i = 0; i < data.length; i++)
	data[i] = in.readObject();
    }

    return data;
  }

  protected Object []createArray(int length)
  {
    if (_componentType != null)
      return (Object []) Array.newInstance(_componentType, length);
    else
      return new Object[length];
  }

  public String toString()
  {
    return "ArrayDeserializer[" + _componentType + "]";
  }
}