/*
* Copyright 2014 cruxframework.org.
*
* 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.cruxframework.crux.core.server.rest.core.dispatch;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.cruxframework.crux.core.server.rest.spi.RestFailure;
import org.cruxframework.crux.core.shared.rest.RestException;
/**
* @author Thiago da Rosa de Bustamante
*
*/
public abstract class RestErrorHandler
{
private Class<?>[] exceptionTypes;
protected Method method;
protected void setMethod(Method method)
{
this.method = method;
this.exceptionTypes = getRestExceptionTypes(method);
}
/**
* When an error occurs during a REST service invocation, a RestErrorHandler is called to handle this error.
* This method must take the exception and throw a RestFailure to wrap the error or return an object that
* will be serialized as response given from the service to the caller.
* @param error
* @param method
* @return
* @throws RestFailure
*/
public abstract Object handleError(InvocationTargetException error) throws RestFailure;
protected Class<?>[] getRestExceptionTypes(Method method)
{
List<Class<?>> result = new ArrayList<Class<?>>();
Class<?>[] types = method.getExceptionTypes();
for (Class<?> exceptionClass : types)
{
if (RestException.class.isAssignableFrom(exceptionClass))
{
result.add(exceptionClass);
}
}
return result.toArray(new Class[result.size()]);
}
protected boolean isCheckedException(Throwable throwable)
{
if (exceptionTypes != null)
{
for (Class<?> exception : exceptionTypes)
{
if (exception.isAssignableFrom(throwable.getClass()))
{
return true;
}
}
}
return false;
}
}