/*
* 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 java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Locale;
/**
* Serializing an object for known object types.
*/
public class BeanDeserializer extends AbstractMapDeserializer {
private Class _type;
private HashMap _methodMap;
private Method _readResolve;
private Constructor _constructor;
private Object []_constructorArgs;
public BeanDeserializer(Class cl)
{
_type = cl;
_methodMap = getMethodMap(cl);
_readResolve = getReadResolve(cl);
Constructor []constructors = cl.getConstructors();
int bestLength = Integer.MAX_VALUE;
for (int i = 0; i < constructors.length; i++) {
if (constructors[i].getParameterTypes().length < bestLength) {
_constructor = constructors[i];
bestLength = _constructor.getParameterTypes().length;
}
}
if (_constructor != null) {
_constructor.setAccessible(true);
Class []params = _constructor.getParameterTypes();
_constructorArgs = new Object[params.length];
for (int i = 0; i < params.length; i++) {
_constructorArgs[i] = getParamArg(params[i]);
}
}
}
public Class getType()
{
return _type;
}
public Object readMap(AbstractHessianInput in)
throws IOException
{
try {
Object obj = instantiate();
return readMap(in, obj);
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOExceptionWrapper(e);
}
}
public Object readMap(AbstractHessianInput in, Object obj)
throws IOException
{
try {
int ref = in.addRef(obj);
while (! in.isEnd()) {
Object key = in.readObject();
Method method = (Method) _methodMap.get(key);
if (method != null) {
Object value = in.readObject(method.getParameterTypes()[0]);
method.invoke(obj, new Object[] {value });
}
else {
Object value = in.readObject();
}
}
in.readMapEnd();
Object resolve = resolve(obj);
if (obj != resolve)
in.setRef(ref, resolve);
return resolve;
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw new IOExceptionWrapper(e);
}
}
private Object resolve(Object obj)
{
// if there's a readResolve method, call it
try {
if (_readResolve != null)
return _readResolve.invoke(obj, new Object[0]);
} catch (Exception e) {
}
return obj;
}
protected Object instantiate()
throws Exception
{
return _constructor.newInstance(_constructorArgs);
}
/**
* Returns the readResolve method
*/
protected Method getReadResolve(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("readResolve") &&
method.getParameterTypes().length == 0)
return method;
}
}
return null;
}
/**
* Creates a map of the classes fields.
*/
protected HashMap getMethodMap(Class cl)
{
HashMap methodMap = new HashMap();
for (; cl != null; cl = cl.getSuperclass()) {
Method []methods = cl.getDeclaredMethods();
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
if (Modifier.isStatic(method.getModifiers()))
continue;
String name = method.getName();
if (! name.startsWith("set"))
continue;
Class []paramTypes = method.getParameterTypes();
if (paramTypes.length != 1)
continue;
if (! method.getReturnType().equals(void.class))
continue;
if (findGetter(methods, name, paramTypes[0]) == null)
continue;
// XXX: could parameterize the handler to only deal with public
try {
method.setAccessible(true);
} catch (Throwable e) {
e.printStackTrace();
}
name = name.substring(3);
int j = 0;
for (; j < name.length() && Character.isUpperCase(name.charAt(j)); j++) {
}
if (j == 1)
name = name.substring(0, j).toLowerCase(Locale.ENGLISH) + name.substring(j);
else if (j > 1)
name = name.substring(0, j - 1).toLowerCase(Locale.ENGLISH) + name.substring(j - 1);
methodMap.put(name, method);
}
}
return methodMap;
}
/**
* Finds any matching setter.
*/
private Method findGetter(Method []methods, String setterName, Class arg)
{
String getterName = "get" + setterName.substring(3);
for (int i = 0; i < methods.length; i++) {
Method method = methods[i];
if (! method.getName().equals(getterName))
continue;
if (! method.getReturnType().equals(arg))
continue;
Class []params = method.getParameterTypes();
if (params.length == 0)
return method;
}
return null;
}
/**
* Creates a map of the classes fields.
*/
protected static Object getParamArg(Class cl)
{
if (! cl.isPrimitive())
return null;
else if (boolean.class.equals(cl))
return Boolean.FALSE;
else if (byte.class.equals(cl))
return Byte.valueOf((byte) 0);
else if (short.class.equals(cl))
return Short.valueOf((short) 0);
else if (char.class.equals(cl))
return Character.valueOf((char) 0);
else if (int.class.equals(cl))
return Integer.valueOf(0);
else if (long.class.equals(cl))
return Long.valueOf(0);
else if (float.class.equals(cl))
return Double.valueOf(0);
else if (double.class.equals(cl))
return Double.valueOf(0);
else
throw new UnsupportedOperationException();
}
}