content: /*
   * Copyright (c) 2001-2008 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 com.caucho.hessian.HessianUnshared;
  
  import java.io.IOException;
  import java.lang.ref.SoftReference;
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  import java.lang.reflect.Modifier;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.WeakHashMap;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  /**
   * Serializing an object for known object types.
   */
  public class JavaSerializer extends AbstractSerializer
  {
    private static final Logger log
      = Logger.getLogger(JavaSerializer.class.getName());
  
    private static final WeakHashMap<Class<?>,SoftReference<JavaSerializer>> _serializerMap
      = new WeakHashMap<Class<?>,SoftReference<JavaSerializer>>();
  
    private Field []_fields;
    private FieldSerializer []_fieldSerializers;
  
    private Object _writeReplaceFactory;
    private Method _writeReplace;
    
    public JavaSerializer(Class<?> cl)
    {
      introspect(cl);
  
      _writeReplace = getWriteReplace(cl);
  
      if (_writeReplace != null)
        _writeReplace.setAccessible(true);
    }
  
    public static Serializer create(Class<?> cl)
    {
      synchronized (_serializerMap) {
        SoftReference<JavaSerializer> baseRef
          = _serializerMap.get(cl);
        
        JavaSerializer base = baseRef != null ? baseRef.get() : null;
  
        if (base == null) {
          if (cl.isAnnotationPresent(HessianUnshared.class))
            base = new JavaUnsharedSerializer(cl);
          else
            base = new JavaSerializer(cl);
          
          baseRef = new SoftReference<JavaSerializer>(base);
          _serializerMap.put(cl, baseRef);
        }
  
        return base;
      }
    }
  
    protected void introspect(Class<?> cl)
    {
      if (_writeReplace != null)
        _writeReplace.setAccessible(true);
  
      ArrayList<Field> primitiveFields = new ArrayList<Field>();
      ArrayList<Field> compoundFields = new ArrayList<Field>();
      
      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);
  
          if (field.getType().isPrimitive()
              || (field.getType().getName().startsWith("java.lang.")
                  && ! field.getType().equals(Object.class)))
            primitiveFields.add(field);
          else
            compoundFields.add(field);
        }
      }
  
      ArrayList<Field> fields = new ArrayList<Field>();
      fields.addAll(primitiveFields);
      fields.addAll(compoundFields);
      // 属性倒序，先写入父类属性，再写入子类属性，保证子类属性不被覆盖
      Collections.reverse(fields);
      _fields = new Field[fields.size()];
      fields.toArray(_fields);
  
      _fieldSerializers = new FieldSerializer[_fields.length];
  
      for (int i = 0; i < _fields.length; i++) {
        _fieldSerializers[i] = getFieldSerializer(_fields[i].getType());
      }
    }
  
    /**
     * Returns the writeReplace method
     */
    protected static Method getWriteReplace(Class<?> cl)
    {
      for (; cl != null; cl = cl.getSuperclass()) {
        Method []methods = cl.getDeclaredMethods();
        
        for (int i = 0; i < methods.length; i++) {
          Method method = methods[i];
  
          if (method.getName().equals("writeReplace")
              && method.getParameterTypes().length == 0)
            return method;
        }
      }
  
      return null;
    }
  
    /**
     * Returns the writeReplace method
     */
    protected Method getWriteReplace(Class<?> cl, Class<?> param)
    {
      for (; cl != null; cl = cl.getSuperclass()) {
        for (Method method : cl.getDeclaredMethods()) {
          if (method.getName().equals("writeReplace")
              && method.getParameterTypes().length == 1
              && param.equals(method.getParameterTypes()[0]))
            return method;
        }
      }
  
      return null;
    }
    
    @Override
    public void writeObject(Object obj, AbstractHessianOutput out)
      throws IOException
    {
      if (out.addRef(obj)) {
        return;
      }
      
      Class<?> cl = obj.getClass();
  
      try {
        if (_writeReplace != null) {
          Object repl;
  
          if (_writeReplaceFactory != null)
            repl = _writeReplace.invoke(_writeReplaceFactory, obj);
          else
            repl = _writeReplace.invoke(obj);
  
          // out.removeRef(obj);
  
          /*
          out.writeObject(repl);
  
          out.replaceRef(repl, obj);
          */
  
          //hessian/3a5a
          int ref = out.writeObjectBegin(cl.getName());
  
          if (ref < -1) {
            writeObject10(repl, out);
          } else {
            if (ref == -1) {
              writeDefinition20(out);
              out.writeObjectBegin(cl.getName());
            }
  
            writeInstance(repl, out);
          }
  
          return;
        }
      } catch (RuntimeException e) {
        throw e;
      } catch (Exception e) {
        // log.log(Level.FINE, e.toString(), e);
        throw new RuntimeException(e);
      }
  
      int ref = out.writeObjectBegin(cl.getName());
  
      if (ref < -1) {
        writeObject10(obj, out);
      }
      else {
        if (ref == -1) {
          writeDefinition20(out);
          out.writeObjectBegin(cl.getName());
        }
  
        writeInstance(obj, out);
      }
    }
    
    protected void writeObject10(Object obj, AbstractHessianOutput out)
      throws IOException
    {
      for (int i = 0; i < _fields.length; i++) {
        Field field = _fields[i];
  
        out.writeString(field.getName());
  
        _fieldSerializers[i].serialize(out, obj, field);
      }
        
      out.writeMapEnd();
    }
    
    private void writeDefinition20(AbstractHessianOutput out)
      throws IOException
    {
      out.writeClassFieldLength(_fields.length);
  
      for (int i = 0; i < _fields.length; i++) {
        Field field = _fields[i];
        
        out.writeString(field.getName());
      }
    }
    
    @Override
    public void writeInstance(Object obj, AbstractHessianOutput out)
      throws IOException
    {
      try {
        for (int i = 0; i < _fields.length; i++) {
          Field field = _fields[i];
  
          _fieldSerializers[i].serialize(out, obj, field);
        }
      } catch (RuntimeException e) {
        throw new RuntimeException(e.getMessage() + "\n class: "
                                   + obj.getClass().getName()
                                   + " (object=" + obj + ")",
                                   e);
      } catch (IOException e) {
        throw new IOExceptionWrapper(e.getMessage() + "\n class: "
                                     + obj.getClass().getName()
                                     + " (object=" + obj + ")",
                                     e);
      }
    }
  
    private static FieldSerializer getFieldSerializer(Class<?> type)
    {
      if (int.class.equals(type)
          || byte.class.equals(type)
          || short.class.equals(type)
          || int.class.equals(type)) {
        return IntFieldSerializer.SER;
      }
      else if (long.class.equals(type)) {
        return LongFieldSerializer.SER;
      }
      else if (double.class.equals(type) ||
          float.class.equals(type)) {
        return DoubleFieldSerializer.SER;
      }
      else if (boolean.class.equals(type)) {
        return BooleanFieldSerializer.SER;
      }
      else if (String.class.equals(type)) {
        return StringFieldSerializer.SER;
      }
      else if (java.util.Date.class.equals(type)
               || java.sql.Date.class.equals(type)
               || java.sql.Timestamp.class.equals(type)
               || java.sql.Time.class.equals(type)) {
        return DateFieldSerializer.SER;
      }
      else
        return FieldSerializer.SER;
    }
  
    static class FieldSerializer {
      static final FieldSerializer SER = new FieldSerializer();
      
      void serialize(AbstractHessianOutput out, Object obj, Field field)
        throws IOException
      {
        Object value = null;
  
        try {
          value = field.get(obj);
        } catch (IllegalAccessException e) {
          log.log(Level.FINE, e.toString(), e);
        }
  
        try {
          out.writeObject(value);
        } catch (RuntimeException e) {
          throw new RuntimeException(e.getMessage() + "\n field: "
                                     + field.getDeclaringClass().getName()
                                     + '.' + field.getName(),
                                     e);
        } catch (IOException e) {
          throw new IOExceptionWrapper(e.getMessage() + "\n field: "
                                       + field.getDeclaringClass().getName()
                                       + '.' + field.getName(),
                                       e);
        }
      }
    }
  
    static class BooleanFieldSerializer extends FieldSerializer {
      static final FieldSerializer SER = new BooleanFieldSerializer();
      
      void serialize(AbstractHessianOutput out, Object obj, Field field)
        throws IOException
      {
        boolean value = false;
  
        try {
          value = field.getBoolean(obj);
        } catch (IllegalAccessException e) {
          log.log(Level.FINE, e.toString(), e);
        }
  
        out.writeBoolean(value);
      }
    }
  
    static class IntFieldSerializer extends FieldSerializer {
      static final FieldSerializer SER = new IntFieldSerializer();
      
      void serialize(AbstractHessianOutput out, Object obj, Field field)
        throws IOException
      {
        int value = 0;
  
        try {
          value = field.getInt(obj);
        } catch (IllegalAccessException e) {
          log.log(Level.FINE, e.toString(), e);
        }
  
        out.writeInt(value);
      }
    }
  
    static class LongFieldSerializer extends FieldSerializer {
      static final FieldSerializer SER = new LongFieldSerializer();
      
      void serialize(AbstractHessianOutput out, Object obj, Field field)
        throws IOException
      {
        long value = 0;
  
        try {
          value = field.getLong(obj);
        } catch (IllegalAccessException e) {
          log.log(Level.FINE, e.toString(), e);
        }
  
        out.writeLong(value);
      }
    }
  
    static class DoubleFieldSerializer extends FieldSerializer {
      static final FieldSerializer SER = new DoubleFieldSerializer();
      
      void serialize(AbstractHessianOutput out, Object obj, Field field)
        throws IOException
      {
        double value = 0;
  
        try {
          value = field.getDouble(obj);
        } catch (IllegalAccessException e) {
          log.log(Level.FINE, e.toString(), e);
        }
  
        out.writeDouble(value);
      }
    }
  
    static class StringFieldSerializer extends FieldSerializer {
      static final FieldSerializer SER = new StringFieldSerializer();
      
      void serialize(AbstractHessianOutput out, Object obj, Field field)
        throws IOException
      {
        String value = null;
  
        try {
          value = (String) field.get(obj);
        } catch (IllegalAccessException e) {
          log.log(Level.FINE, e.toString(), e);
        }
  
        out.writeString(value);
      }
    }
  
    static class DateFieldSerializer extends FieldSerializer {
      static final FieldSerializer SER = new DateFieldSerializer();
  
      void serialize(AbstractHessianOutput out, Object obj, Field field)
        throws IOException
      {
        java.util.Date value = null;
  
        try {
          value = (java.util.Date) field.get(obj);
        } catch (IllegalAccessException e) {
          log.log(Level.FINE, e.toString(), e);
        }
  
        if (value == null)
          out.writeNull();
        else
          out.writeUTCDate(value.getTime());
      }
    }
  }
  