content: /*
   * 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
   *    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.hessian.io;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  import java.util.ArrayList;
  import java.util.HashMap;
  
  /**
   * Input stream for Hessian requests, deserializing objects using the
   * java.io.Serialization protocol.
   *
   * <p>HessianSerializerInput is unbuffered, so any client needs to provide
   * its own buffering.
   *
   * <h3>Serialization</h3>
   *
   * <pre>
   * InputStream is = new FileInputStream("test.xml");
   * HessianOutput in = new HessianSerializerOutput(is);
   *
   * Object obj = in.readObject();
   * is.close();
   * </pre>
   *
   * <h3>Parsing a Hessian reply</h3>
   *
   * <pre>
   * InputStream is = ...; // from http connection
   * HessianInput in = new HessianSerializerInput(is);
   * String value;
   *
   * in.startReply();         // read reply header
   * value = in.readString(); // read string value
   * in.completeReply();      // read reply footer
   * </pre>
   */
  public class HessianSerializerInput extends Hessian2Input {
    /**
     * Creates a new Hessian input stream, initialized with an
     * underlying input stream.
     *
     * @param is the underlying input stream.
     */
    public HessianSerializerInput(InputStream is)
    {
      super(is);
    }
  
    /**
     * Creates an uninitialized Hessian input stream.
     */
    public HessianSerializerInput()
    {
      super(null);
    }
  
    /**
     * Reads an object from the input stream.  cl is known not to be
     * a Map.
     */
    protected Object readObjectImpl(Class cl)
      throws IOException
    {
      try {
        Object obj = cl.newInstance();
  
        if (_refs == null)
          _refs = new ArrayList();
        _refs.add(obj);
  
        HashMap fieldMap = getFieldMap(cl);
  
        int code = read();
        for (; code >= 0 && code != 'z'; code = read()) {
          unread();
          
          Object key = readObject();
          
          Field field = (Field) fieldMap.get(key);
  
          if (field != null) {
            Object value = readObject(field.getType());
            field.set(obj, value);
          }
          else {
            Object value = readObject();
          }
        }
        
        if (code != 'z')
          throw expect("map", code);
  
        // if there's a readResolve method, call it
        try {
          Method method = cl.getMethod("readResolve", new Class[0]);
          return method.invoke(obj, new Object[0]);
        } catch (Exception e) {
        }
  
        return obj;
      } catch (IOException e) {
        throw e;
      } catch (Exception e) {
        throw new IOExceptionWrapper(e);
      }
    }
  
    /**
     * Creates a map of the classes fields.
     */
    protected HashMap getFieldMap(Class cl)
    {
      HashMap fieldMap = new HashMap();
      
      for (; cl != null; cl = cl.getSuperclass()) {
        Field []fields = cl.getDeclaredFields();
        for (int i = 0; i < fields.length; i++) {
          Field field = fields[i];
  
          if (Modifier.isTransient(field.getModifiers()) ||
              Modifier.isStatic(field.getModifiers()))
            continue;
  
          // XXX: could parameterize the handler to only deal with public
          field.setAccessible(true);
  
          fieldMap.put(field.getName(), field);
        }
      }
  
      return fieldMap;
    }
  }
  