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Liferay Portal Workflow Kaleo Service
/*
* jabsorb - a Java to JavaScript Advanced Object Request Broker
* http://www.jabsorb.org
*
* Copyright 2007-2009 The jabsorb team
*
* based on original code from
* JSON-RPC-Java - a JSON-RPC to Java Bridge with dynamic invocation
*
* Copyright Metaparadigm Pte. Ltd. 2004.
* Michael Clark
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.jabsorb.serializer.impl;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.jabsorb.JSONSerializer;
import org.jabsorb.serializer.AbstractSerializer;
import org.jabsorb.serializer.MarshallException;
import org.jabsorb.serializer.ObjectMatch;
import org.jabsorb.serializer.SerializerState;
import org.jabsorb.serializer.UnmarshallException;
import org.json.JSONException;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Serialises java beans that are known to have readable and writable properties
*/
public class BeanSerializer extends AbstractSerializer
{
/**
* Stores the readable and writable properties for the Bean.
*/
protected static class BeanData
{
// TODO: Legacy comment. WTF?
// in absence of getters and setters, these fields are
// public to allow subclasses to access.
/**
* The bean info for a certain bean
*/
public BeanInfo beanInfo;
/**
* The readable properties of the bean.
*/
public Map readableProps;
/**
* The writable properties of the bean.
*/
public Map writableProps;
}
/**
* Unique serialisation id.
*/
private final static long serialVersionUID = 2;
/**
* The logger for this class
*/
private final static Logger log = LoggerFactory
.getLogger(BeanSerializer.class);
/**
* Caches analysed beans
*/
private static HashMap beanCache = new HashMap();
/**
* Classes that this can serialise.
*
* TODO: Yay for bloat!
*/
private static Class[] _serializableClasses = new Class[] {};
/**
* Classes that this can serialise to.
*
* TODO: Yay for bloat!
*/
private static Class[] _JSONClasses = new Class[] {};
/**
* Analyses a bean, returning a BeanData with the data extracted from it.
*
* @param clazz The class of the bean to analyse
* @return A populated BeanData
* @throws IntrospectionException If a problem occurs during getting the bean
* info.
*/
public static BeanData analyzeBean(Class clazz) throws IntrospectionException
{
log.info("analyzing " + clazz.getName());
BeanData bd = new BeanData();
bd.beanInfo = Introspector.getBeanInfo(clazz, Object.class);
PropertyDescriptor props[] = bd.beanInfo.getPropertyDescriptors();
bd.readableProps = new HashMap();
bd.writableProps = new HashMap();
for (int i = 0; i < props.length; i++)
{
//This is declared by enums and shouldn't be shown.
if(props[i].getName().equals("declaringClass"))
{
continue;
}
if (props[i].getWriteMethod() != null)
{
bd.writableProps.put(props[i].getName(), props[i].getWriteMethod());
}
if (props[i].getReadMethod() != null)
{
bd.readableProps.put(props[i].getName(), props[i].getReadMethod());
}
}
return bd;
}
/**
* Gets the bean data from cache if possible, otherwise analyses the bean.
*
* @param clazz The class of the bean to analyse
* @return A populated BeanData
* @throws IntrospectionException If a problem occurs during getting the bean
* info.
*/
public static BeanData getBeanData(Class clazz) throws IntrospectionException
{
BeanData bd;
synchronized (beanCache)
{
bd = (BeanData) beanCache.get(clazz);
if (bd == null)
{
bd = analyzeBean(clazz);
beanCache.put(clazz, bd);
}
}
return bd;
}
public boolean canSerialize(Class clazz, Class jsonClazz)
{
return (!clazz.isArray() && !clazz.isPrimitive() && !clazz.isInterface() && (jsonClazz == null || jsonClazz == JSONObject.class));
}
public Class[] getJSONClasses()
{
return _JSONClasses;
}
public Class[] getSerializableClasses()
{
return _serializableClasses;
}
public Object marshall(SerializerState state, Object p, Object o)
throws MarshallException
{
BeanData bd;
try
{
bd = getBeanData(o.getClass());
}
catch (IntrospectionException e)
{
throw new MarshallException(o.getClass().getName() +
" is not a bean", e);
}
JSONObject val = new JSONObject();
if (ser.getMarshallClassHints())
{
try
{
val.put("javaClass", o.getClass().getName());
}
catch (JSONException e)
{
throw new MarshallException(
"JSONException: " + e.getMessage(), e);
}
}
Iterator i = bd.readableProps.entrySet().iterator();
Object args[] = new Object[0];
Object result;
while (i.hasNext())
{
Map.Entry ent = (Map.Entry) i.next();
String prop = (String) ent.getKey();
Method getMethod = (Method) ent.getValue();
if (log.isDebugEnabled())
{
log.debug("invoking " + getMethod.getName() + "()");
}
try
{
result = getMethod.invoke(o, args);
}
catch (Throwable e)
{
if (e instanceof InvocationTargetException)
{
e = ((InvocationTargetException) e).getTargetException();
}
throw new MarshallException("bean " + o.getClass().getName()
+ " can't invoke " + getMethod.getName() + ": " + e.getMessage(), e);
}
try
{
if (result != null || ser.getMarshallNullAttributes())
{
try
{
Object json = ser.marshall(state, o, result, prop);
// omit the object entirely if it's a circular reference or duplicate
// it will be regenerated in the fixups phase
if (JSONSerializer.CIRC_REF_OR_DUPLICATE != json)
{
val.put(prop, json);
}
}
catch (JSONException e)
{
throw new MarshallException(
"JSONException: " + e.getMessage(), e);
}
}
}
catch (MarshallException e)
{
throw new MarshallException("bean " + o.getClass().getName() + " "
+ e.getMessage(), e);
}
}
return val;
}
public ObjectMatch tryUnmarshall(SerializerState state, Class clazz, Object o)
throws UnmarshallException
{
JSONObject jso = (JSONObject) o;
BeanData bd;
try
{
bd = getBeanData(clazz);
}
catch (IntrospectionException e)
{
throw new UnmarshallException(clazz.getName() + " is not a bean", e);
}
int match = 0;
int mismatch = 0;
Iterator i = bd.writableProps.entrySet().iterator();
while (i.hasNext())
{
Map.Entry ent = (Map.Entry) i.next();
String prop = (String) ent.getKey();
if (jso.has(prop))
{
match++;
}
else
{
mismatch++;
}
}
if (match == 0)
{
throw new UnmarshallException("bean has no matches");
}
// create a concrete ObjectMatch that is always returned in order to satisfy circular reference requirements
ObjectMatch returnValue = new ObjectMatch(-1);
state.setSerialized(o, returnValue);
ObjectMatch m = null;
ObjectMatch tmp;
i = jso.keys();
while (i.hasNext())
{
String field = (String) i.next();
Method setMethod = (Method) bd.writableProps.get(field);
if (setMethod != null)
{
try
{
Class param[] = setMethod.getParameterTypes();
if (param.length != 1)
{
throw new UnmarshallException("bean " + clazz.getName()
+ " method " + setMethod.getName() + " does not have one arg");
}
tmp = ser.tryUnmarshall(state, param[0], jso.get(field));
if(tmp!=null)
{
if (m == null)
{
m = tmp;
}
else
{
m = m.max(tmp);
}
}
}
catch (UnmarshallException e)
{
throw new UnmarshallException("bean " + clazz.getName() + " "
+ e.getMessage(), e);
}
catch (JSONException e)
{
throw new UnmarshallException("bean " + clazz.getName() + " "
+ e.getMessage(), e);
}
}
else
{
mismatch++;
}
}
if (m != null)
{
returnValue.setMismatch(m.max(new ObjectMatch(mismatch)).getMismatch());
}
else
{
returnValue.setMismatch(mismatch);
}
return returnValue;
}
public Object unmarshall(SerializerState state, Class clazz, Object o)
throws UnmarshallException
{
JSONObject jso = (JSONObject) o;
BeanData bd;
try
{
bd = getBeanData(clazz);
}
catch (IntrospectionException e)
{
throw new UnmarshallException(clazz.getName() + " is not a bean", e);
}
if (log.isDebugEnabled())
{
log.debug("instantiating " + clazz.getName());
}
Object instance;
try
{
instance = clazz.newInstance();
}
catch (InstantiationException e)
{
throw new UnmarshallException(
"could not instantiate bean of type " +
clazz.getName() + ", make sure it has a no argument " +
"constructor and that it is not an interface or " +
"abstract class", e);
}
catch (IllegalAccessException e)
{
throw new UnmarshallException(
"could not instantiate bean of type " +
clazz.getName(), e);
}
catch (RuntimeException e)
{
throw new UnmarshallException(
"could not instantiate bean of type " +
clazz.getName(), e);
}
state.setSerialized(o, instance);
Object invokeArgs[] = new Object[1];
Object fieldVal;
Iterator i = jso.keys();
while (i.hasNext())
{
String field = (String) i.next();
Method setMethod = (Method) bd.writableProps.get(field);
if (setMethod != null)
{
try
{
Class param[] = setMethod.getParameterTypes();
fieldVal = ser.unmarshall(state, param[0], jso.get(field));
}
catch (UnmarshallException e)
{
throw new UnmarshallException(
"could not unmarshall field \"" + field + "\" of bean " +
clazz.getName(), e);
}
catch (JSONException e)
{
throw new UnmarshallException(
"could not unmarshall field \"" + field + "\" of bean " +
clazz.getName(), e);
}
if (log.isDebugEnabled())
{
log.debug("invoking " + setMethod.getName() + "(" + fieldVal + ")");
}
invokeArgs[0] = fieldVal;
try
{
setMethod.invoke(instance, invokeArgs);
}
catch (Throwable e)
{
if (e instanceof InvocationTargetException)
{
e = ((InvocationTargetException) e).getTargetException();
}
throw new UnmarshallException("bean " + clazz.getName()
+ "can't invoke " + setMethod.getName() + ": " + e.getMessage(), e);
}
}
}
return instance;
}
}
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