alfresco-community-repo/source/java/org/alfresco/util/json/ExceptionJsonSerializer.java
Gavin Cornwell 1c20bf7ded Merged BRANCHES/V3.4 to HEAD:
24143: Fixed licence header

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@24153 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
2010-12-02 11:32:28 +00:00

165 lines
5.9 KiB
Java

/*
* Copyright (C) 2005-2010 Alfresco Software Limited.
*
* This file is part of Alfresco
*
* Alfresco is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Alfresco is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
*/
package org.alfresco.util.json;
import java.lang.reflect.Constructor;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.service.cmr.transfer.TransferException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class ExceptionJsonSerializer implements JsonSerializer<Throwable, JSONObject>
{
private final static Log log = LogFactory.getLog(ExceptionJsonSerializer.class);
@Override
public Throwable deserialize(JSONObject errorJSON)
{
if (errorJSON == null)
{
return null;
}
Throwable result = null;
Object createdObject = null;
try
{
//errorType and errorMessage should always be reported
String errorType = errorJSON.getString("errorType");
String errorMessage = errorJSON.getString("errorMessage");
if (errorType == null)
{
errorType = Exception.class.getName();
}
if (errorMessage == null)
{
errorMessage = "";
}
//alfrescoErrorId and alfrescoErrorParams will only appear if the
//throwable object was of a subclass of AlfrescoRuntimeException
String errorId = errorJSON.optString("alfrescoMessageId", null);
Object[] errorParams = new Object[0];
JSONArray errorParamArray = errorJSON.optJSONArray("alfrescoMessageParams");
if (errorParamArray != null)
{
int length = errorParamArray.length();
errorParams = new Object[length];
for (int i = 0; i < length; ++i)
{
errorParams[i] = errorParamArray.getString(i);
}
}
Class<?> errorClass;
try
{
errorClass = Class.forName(errorType);
}
catch (ClassNotFoundException e)
{
errorClass = Exception.class;
}
Constructor<?> constructor = null;
try
{
try
{
constructor = errorClass.getConstructor(String.class, Object[].class);
createdObject = constructor.newInstance(errorId, errorParams);
}
catch (NoSuchMethodException e)
{
try
{
constructor = errorClass.getConstructor(String.class);
createdObject = constructor.newInstance(errorId == null ? errorMessage : errorId);
}
catch (NoSuchMethodException e1)
{
try
{
constructor = errorClass.getConstructor();
createdObject = constructor.newInstance();
}
catch (NoSuchMethodException e2)
{
}
}
}
}
catch(Exception ex)
{
//We don't need to do anything here. Code below will fix things up
}
if (createdObject == null || !Throwable.class.isAssignableFrom(createdObject.getClass()))
{
result = new TransferException(errorId == null ? errorMessage : errorId, errorParams);
}
else
{
result = (Throwable)createdObject;
}
}
catch(JSONException ex)
{
if (log.isDebugEnabled())
{
log.debug("Failed to deserialize Throwable object from JSON object", ex);
}
}
return result;
}
@Override
public JSONObject serialize(Throwable object)
{
JSONObject errorObject = new JSONObject();
try
{
errorObject.put("errorType", object.getClass().getName());
errorObject.put("errorMessage", object.getMessage());
if (AlfrescoRuntimeException.class.isAssignableFrom(object.getClass()))
{
AlfrescoRuntimeException alfEx = (AlfrescoRuntimeException)object;
errorObject.put("alfrescoMessageId", alfEx.getMsgId());
Object[] msgParams = alfEx.getMsgParams();
List<Object> params = msgParams == null ? Collections.emptyList() : Arrays.asList(msgParams);
errorObject.put("alfrescoMessageParams", params);
}
}
catch (JSONException e)
{
if (log.isDebugEnabled())
{
log.debug("Failed to serialize Throwable object into JSON object", e);
}
}
return errorObject;
}
}