Added missing exist method

src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClient.java

@@ -13,16 +13,17 @@ import org.gcube.informationsystem.types.reference.Type;
  */
 public interface ResourceRegistrySchemaClient {
 
-	public <E extends Element> Type create(Class<E> clz)
-			throws SchemaException, ResourceRegistryException;
-	
-	public String create(String typeDefinitition)
-			throws SchemaException, ResourceRegistryException;
-	
+	public <E extends Element> Type create(Class<E> clz) throws SchemaException, ResourceRegistryException;
+
+	public String create(String typeDefinitition) throws SchemaException, ResourceRegistryException;
+
+	public <E extends Element> boolean exist(Class<E> clz) throws ResourceRegistryException;
+
+	public boolean exist(String typeName) throws ResourceRegistryException;
+
 	public <E extends Element> List<Type> read(Class<E> clz, Boolean polymorphic)
 			throws SchemaNotFoundException, ResourceRegistryException;
-	
-	public String read(String typeName, Boolean polymorphic)
-			throws SchemaNotFoundException, ResourceRegistryException;
-	
+
+	public String read(String typeName, Boolean polymorphic) throws SchemaNotFoundException, ResourceRegistryException;
+
 }

src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java

@@ -8,6 +8,7 @@ import java.util.Map;
 import org.gcube.common.gxhttp.reference.GXConnection;
 import org.gcube.common.gxhttp.request.GXHTTPStringRequest;
 import org.gcube.informationsystem.base.reference.Element;
+import org.gcube.informationsystem.resourceregistry.api.exceptions.NotFoundException;
 import org.gcube.informationsystem.resourceregistry.api.exceptions.ResourceRegistryException;
 import org.gcube.informationsystem.resourceregistry.api.exceptions.contexts.ContextAlreadyPresentException;
 import org.gcube.informationsystem.resourceregistry.api.exceptions.contexts.ContextNotFoundException;
@@ -76,6 +77,45 @@ public class ResourceRegistrySchemaClientImpl implements ResourceRegistrySchemaC
 		}
 	}
 	
+	@Override
+	public <E extends Element> boolean exist(Class<E> clz) throws ResourceRegistryException {
+		try {
+			String typeName = Utility.getTypeName(clz);
+			return exist(typeName);
+		} catch(ResourceRegistryException e) {
+			throw e;
+		} catch(Exception e) {
+			throw new RuntimeException(e);
+		}
+	}
+	
+	@Override
+	public boolean exist(String typeName) throws ResourceRegistryException {
+		try {
+			logger.info("Going to get {} schema", typeName);
+			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPStringRequest.newRequest(address);
+			gxHTTPStringRequest.from(ResourceRegistrySchemaClient.class.getSimpleName());
+			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
+			gxHTTPStringRequest.path(TypePath.TYPES_PATH_PART);
+			gxHTTPStringRequest.path(typeName);
+			
+			Map<String,String> parameters = new HashMap<>();
+			parameters.put(TypePath.POLYMORPHIC_PARAM, Boolean.FALSE.toString());
+			gxHTTPStringRequest.queryParams(parameters);
+			
+			HttpURLConnection httpURLConnection = gxHTTPStringRequest.get();
+			HTTPUtility.getResponse(String.class, httpURLConnection);
+			
+			return true;
+		} catch (NotFoundException e) {
+			return false;
+		} catch(ResourceRegistryException e) {
+			throw e;
+		} catch(Exception e) {
+			throw new RuntimeException(e);
+		}
+	}
+	
 	
 	@Override
 	public <E extends Element> List<Type> read(Class<E> clz, Boolean polymorphic)