Check that the context has no resources before deleting it.

git-svn-id: https://svn.d4science.research-infrastructures.eu/gcube/trunk/resource-management/resource-manager@164762 82a268e6-3cf1-43bd-a215-b396298e98cf

webapp/src/main/java/org/gcube/resourcemanagement/manager/webapp/context/Queries.java

@@ -3,10 +3,14 @@ package org.gcube.resourcemanagement.manager.webapp.context;
 import java.util.UUID;
 
 import org.gcube.informationsystem.model.entity.Context;
+import org.gcube.informationsystem.model.entity.Resource;
 import org.gcube.informationsystem.resourceregistry.api.exceptions.ResourceRegistryException;
+import org.gcube.informationsystem.resourceregistry.client.ResourceRegistryClient;
+import org.gcube.informationsystem.resourceregistry.client.ResourceRegistryClientFactory;
 import org.gcube.informationsystem.resourceregistry.context.ResourceRegistryContextClient;
 import org.gcube.informationsystem.resourceregistry.context.ResourceRegistryContextClientFactory;
 
+
 /**
  * Queries submitted within the context resource.
  * 
@@ -15,19 +19,23 @@ import org.gcube.informationsystem.resourceregistry.context.ResourceRegistryCont
  */
 final class Queries {
 	
-	private final ResourceRegistryContextClient client;
+	private final ResourceRegistryContextClient cclient;
+	private final ResourceRegistryClient rclient;
+
 
 	protected Queries() {
-		client = ResourceRegistryContextClientFactory.create();
+		cclient = ResourceRegistryContextClientFactory.create();
+		rclient = ResourceRegistryClientFactory.create();
 	}
 	
 	/**
 	 * Makes the queries with the given client.
 	 * 
-	 * @param client
+	 * @param cclient
 	 */
-	protected Queries(ResourceRegistryContextClient client) {
-		this.client = client;
+	protected Queries(ResourceRegistryContextClient cclient) {
+		this.cclient = cclient;
+		this.rclient = ResourceRegistryClientFactory.create();
 	}
 	
 	/**
@@ -38,7 +46,7 @@ final class Queries {
 	 */
 	protected boolean contextExists(UUID context) {
 		try {
-			return this.client.read(context) != null;
+			return this.cclient.read(context) != null;
 		} catch (ResourceRegistryException e) {
 			return false;
 		}catch (RuntimeException e) {
@@ -55,7 +63,7 @@ final class Queries {
 	 */
 	protected Context fetchContext(UUID context) {
 		try {
-			return this.client.read(context);
+			return this.cclient.read(context);
 		} catch (ResourceRegistryException e) {
 			return null;
 		}
@@ -66,10 +74,14 @@ final class Queries {
 	 * Detects if the context has no resources.
 	 * 
 	 * @param context the context to check 
-	 * @return
+	 * @return true if the content is empty.
 	 */
 	protected boolean isContextEmpty(UUID context) {
-		return false;
+		try {
+			return this.rclient.getInstances(Resource.class, true).size() == 0;
+		} catch (ResourceRegistryException e) {
+			return false;
+		}
 	}
 
 }