/**
* Copyright [2013] [www.cuubez.com]
* 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 com.cuubez.core.handler;
import java.lang.reflect.InvocationTargetException;
import com.cuubez.core.context.MessageContext;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.core.MediaType;
import com.cuubez.core.exception.CuubezExceptionConstance;
import com.cuubez.core.resource.metaData.SelectedResourceMetaData;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.cuubez.core.exception.CuubezException;
public class ResourceInvokeHandler implements RequestHandler {
private static Log log = LogFactory.getLog(ResourceInvokeHandler.class);
public void handleRequest(MessageContext messageContext) throws CuubezException {
SelectedResourceMetaData selectedResourceMetaData = messageContext.getRequestContext().getSelectedResource();
log.trace("resource invocation process started");
try {
Object[] arguments = getResourceArguments(selectedResourceMetaData);
Class<?> cls = selectedResourceMetaData.getSelectedMethodMetaData().getClazz();
Object obj = cls.newInstance();
java.lang.reflect.Method selectedMethod = selectedResourceMetaData.getSelectedMethodMetaData().getReflectionMethod();
validateArguments(selectedMethod, arguments);
Object returnObject = selectedMethod.invoke(obj, arguments);
if (selectedMethod.getReturnType().equals(Void.TYPE)) {
messageContext.getResponseContext().setResponseCode(HttpServletResponse.SC_NO_CONTENT);
} else if (returnObject != null) {
messageContext.getResponseContext().setReturnObject(returnObject);
messageContext.getResponseContext().setMediaType(populateResponseMediaType(selectedResourceMetaData.getSelectedMethodMetaData().getProduce(), messageContext.getRequestContext().getUrlContext().getMediaType()));
}
} catch (InvocationTargetException e) {
e.printStackTrace();
log.error(e);
throw new CuubezException(CuubezExceptionConstance.INVOCATION_EXCEPTION);
} catch (InstantiationException e) {
log.error(e);
throw new CuubezException(CuubezExceptionConstance.INVOCATION_EXCEPTION);
} catch (IllegalAccessException e) {
log.error(e);
throw new CuubezException(CuubezExceptionConstance.INVOCATION_EXCEPTION);
} catch (SecurityException e) {
log.error(e);
throw new CuubezException(CuubezExceptionConstance.INVOCATION_EXCEPTION);
} catch (IllegalArgumentException e) {
log.error(e);
throw new CuubezException(CuubezExceptionConstance.ILLEGAL_ARGUMENT_EXCEPTION);
}
}
private boolean validateArguments(java.lang.reflect.Method selectedMethod, Object[] arguments) {
return true; //TODO need to implement
}
private Object[] getResourceArguments(SelectedResourceMetaData selectedResourceMetaData) {
return selectedResourceMetaData.getSelectedMethodMetaData().getParameters();
}
private String populateResponseMediaType(String[] produceMediaTypes, String requestMediaType) throws CuubezException {
if (requestMediaType == null && isNotSpecifyMediaType(produceMediaTypes)) {
return MediaType.APPLICATION_XML;
} else if (requestMediaType == null && !isNotSpecifyMediaType(produceMediaTypes)) {
return produceMediaTypes[0];
} else if (requestMediaType != null && !isNotSpecifyMediaType(produceMediaTypes)) {
for (String produceMediaType : produceMediaTypes) {
if (requestMediaType.equals(produceMediaType)) {
return requestMediaType;
}
}
} else {
log.error("unsupported response media type");
throw new CuubezException(CuubezExceptionConstance.UNSUPPORTED_MEDIA_TYPE);
}
log.error("unsupported response media type");
throw new CuubezException(CuubezExceptionConstance.UNSUPPORTED_MEDIA_TYPE);
}
private boolean isNotSpecifyMediaType(String[] produce) {
if (produce == null || produce.length == 0 || (produce.length == 1 && produce[0] == "*/*")) {
return true;
}
return false;
}
}