com.sap.cloud.sdk.service.prov.v4.util.ChangeSetUtil Maven / Gradle / Ivy

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SAP Cloud Platform SDK for service development
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/*******************************************************************************
 * (c) 201X SAP SE or an SAP affiliate company. All rights reserved.
 ******************************************************************************/
package com.sap.cloud.sdk.service.prov.v4.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Locale;

import org.apache.olingo.commons.api.http.HttpStatusCode;
import org.apache.olingo.server.api.ODataApplicationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sap.cloud.sdk.service.prov.annotation.repository.AnnotatedClassMethod;
import com.sap.cloud.sdk.service.prov.annotation.repository.AnnotationRepository;
import com.sap.cloud.sdk.service.prov.api.ChangeSetHandler;
import com.sap.cloud.sdk.service.prov.api.operations.ChangeSet;

public class ChangeSetUtil {
	private static Logger log = LoggerFactory.getLogger(ChangeSetUtil.class);
	private static final String CHANGESET = "ChangeSet";
	private static final String GENERIC_ENDUSER_ERROR = "Internal Server Error; check log for details";
	
	private ChangeSetHandler changeSet;
	String serviceName;
	
	public ChangeSetUtil(ChangeSetHandler handler,String serviceName){
		this.changeSet = handler;this.serviceName=serviceName;
	}
	
	public void invokeChangeSetOperation() throws ODataApplicationException {
		if (log.isDebugEnabled()) {
			log.debug("Find method name for annoted operation: " + CHANGESET + " service name: " + serviceName);
		}
		boolean isDuplicate = false;
		boolean isPresent = false;
		List> list = AnnotationRepository.getInstance().getClassMethodListForAnnotation(CHANGESET);
		AnnotatedClassMethod annotatedMethodToBeInvoked = null;
		if (list != null) {
			Method method = null;
			boolean isDefaultPresent = false;
			String annotOperServiceName = null;
			ChangeSet changeSetAnno = null;
			for (AnnotatedClassMethod annotatedClassMethod : list) {
				method = annotatedClassMethod.getMethod();
				changeSetAnno = method.getAnnotation(ChangeSet.class);
				annotOperServiceName = changeSetAnno.serviceName();
				if (annotOperServiceName.equals("") && !isPresent) {
					if (isDefaultPresent) {
						isDuplicate = true;
					}
					isDefaultPresent =true;
					annotatedMethodToBeInvoked = annotatedClassMethod;
					log.debug("Found default annoted method: " + method.getName() + " for operation " + CHANGESET);
				}
				if (annotOperServiceName.equals(serviceName)) {
					if (isPresent) {
						log.error("Duplicate custom method "+ method.getName() + " found for annoted operation: " + CHANGESET + " service name: " + serviceName);
						throw new ODataApplicationException(GENERIC_ENDUSER_ERROR,
								HttpStatusCode.INTERNAL_SERVER_ERROR.getStatusCode(), Locale.ENGLISH);

					}
					isPresent = true;
					annotatedMethodToBeInvoked = annotatedClassMethod;
					log.debug("Found annoted method: " + method.getName() + " for operation: " + CHANGESET + " for service name: " + serviceName);
				}
			}
		}
		if (!isPresent && isDuplicate) {
			log.error("Duplicate custom method found for annoted operation: " + CHANGESET + " service name: " + serviceName);
			throw new ODataApplicationException(GENERIC_ENDUSER_ERROR,
					HttpStatusCode.INTERNAL_SERVER_ERROR.getStatusCode(), Locale.ENGLISH);
		}
		if (annotatedMethodToBeInvoked == null) {
			log.error("No match found for annoted operation: " + CHANGESET + " service name: " + serviceName);
			throw new ODataApplicationException("Method not implemented",
					HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH);
		}
		try {
			Class clazz = (Class)annotatedMethodToBeInvoked.getUserClass();
			Method method = annotatedMethodToBeInvoked.getMethod();
			method.invoke(clazz.newInstance(), changeSet);
		} catch (IllegalAccessException | InvocationTargetException | InstantiationException e) {
			log.error(e.getMessage());
			throw new ODataApplicationException(e.getMessage(),
					HttpStatusCode.NOT_IMPLEMENTED.getStatusCode(), Locale.ENGLISH, e);
		}
	}
}