Gh-3324: Add OperationChainValidator to FedStore POC

store-implementation/simple-federated-store/src/main/java/uk/gov/gchq/gaffer/federated/simple/FederatedStore.java

@@ -33,6 +33,7 @@
 import uk.gov.gchq.gaffer.federated.simple.access.GraphAccess;
 import uk.gov.gchq.gaffer.federated.simple.operation.AddGraph;
 import uk.gov.gchq.gaffer.federated.simple.operation.ChangeGraphId;
+import uk.gov.gchq.gaffer.federated.simple.operation.FederatedOperationChainValidator;
 import uk.gov.gchq.gaffer.federated.simple.operation.GetAllGraphIds;
 import uk.gov.gchq.gaffer.federated.simple.operation.GetAllGraphInfo;
 import uk.gov.gchq.gaffer.federated.simple.operation.RemoveGraph;
@@ -63,9 +64,11 @@
 import uk.gov.gchq.gaffer.store.operation.DeleteAllData;
 import uk.gov.gchq.gaffer.store.operation.GetSchema;
 import uk.gov.gchq.gaffer.store.operation.GetTraits;
+import uk.gov.gchq.gaffer.store.operation.OperationChainValidator;
 import uk.gov.gchq.gaffer.store.operation.handler.OperationHandler;
 import uk.gov.gchq.gaffer.store.operation.handler.OutputOperationHandler;
 import uk.gov.gchq.gaffer.store.schema.Schema;
+import uk.gov.gchq.gaffer.store.schema.ViewValidator;
 
 import java.util.AbstractMap.SimpleEntry;
 import java.util.ArrayList;
@@ -351,6 +354,11 @@ protected OperationHandler<? extends OperationChain<?>> getOperationChainHandler
         return new FederatedOperationHandler<>();
     }
 
+    @Override
+    protected OperationChainValidator createOperationChainValidator() {
+        return new FederatedOperationChainValidator(new ViewValidator());
+    }
+
     @Override
     protected OutputOperationHandler<GetElements, Iterable<? extends Element>> getGetElementsHandler() {
         return new FederatedOutputHandler<>();

store-implementation/simple-federated-store/src/main/java/uk/gov/gchq/gaffer/federated/simple/operation/FederatedOperationChainValidator.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2024 Crown Copyright
+ *
+ * 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 uk.gov.gchq.gaffer.federated.simple.operation;
+
+import uk.gov.gchq.gaffer.core.exception.GafferRuntimeException;
+import uk.gov.gchq.gaffer.operation.Operation;
+import uk.gov.gchq.gaffer.operation.OperationException;
+import uk.gov.gchq.gaffer.store.Context;
+import uk.gov.gchq.gaffer.store.Store;
+import uk.gov.gchq.gaffer.store.operation.GetSchema;
+import uk.gov.gchq.gaffer.store.operation.OperationChainValidator;
+import uk.gov.gchq.gaffer.store.schema.Schema;
+import uk.gov.gchq.gaffer.store.schema.ViewValidator;
+import uk.gov.gchq.gaffer.user.User;
+
+/**
+ * Extends {@link OperationChainValidator} and uses the FederatedStore to get
+ * the merged schema based on the operation options.
+ */
+public class FederatedOperationChainValidator extends OperationChainValidator {
+
+    public FederatedOperationChainValidator(final ViewValidator viewValidator) {
+        super(viewValidator);
+    }
+
+    @Override
+    protected Schema getSchema(final Operation operation, final User user, final Store store) {
+        try {
+            return store.execute(new GetSchema.Builder().options(operation.getOptions()).build(), new Context(user));
+        } catch (final OperationException e) {
+            throw new GafferRuntimeException("Unable to get merged schema for graph " + store.getGraphId(), e);
+        }
+    }
+}

store-implementation/simple-federated-store/src/test/java/uk/gov/gchq/gaffer/federated/simple/operation/FederatedOperationChainValidatorTest.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2024 Crown Copyright
+ *
+ * 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 uk.gov.gchq.gaffer.federated.simple.operation;
+
+import org.junit.jupiter.api.Test;
+
+import uk.gov.gchq.gaffer.core.exception.GafferRuntimeException;
+import uk.gov.gchq.gaffer.federated.simple.FederatedStore;
+import uk.gov.gchq.gaffer.operation.Operation;
+import uk.gov.gchq.gaffer.operation.OperationException;
+import uk.gov.gchq.gaffer.store.Context;
+import uk.gov.gchq.gaffer.store.operation.GetSchema;
+import uk.gov.gchq.gaffer.store.schema.Schema;
+import uk.gov.gchq.gaffer.store.schema.ViewValidator;
+import uk.gov.gchq.gaffer.user.User;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.fail;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+class FederatedOperationChainValidatorTest {
+    final ViewValidator viewValidator = mock(ViewValidator.class);
+    final FederatedOperationChainValidator validator = new FederatedOperationChainValidator(viewValidator);
+    final FederatedStore store = mock(FederatedStore.class);
+    final User user = mock(User.class);
+    final Operation op = mock(Operation.class);
+    final Schema schema = mock(Schema.class);
+
+    @Test
+    void shouldGetMergedSchema() throws OperationException {
+        // Given
+        when(store.execute(any(GetSchema.class), any(Context.class))).thenReturn(schema);
+
+        // When
+        final Schema result = validator.getSchema(op, user, store);
+
+        verify(store).execute(any(GetSchema.class), any(Context.class));
+        // Then
+        assertThat(result).isEqualTo(schema);
+    }
+
+    @Test
+    void shouldThrowException() throws OperationException {
+        // Given
+        when(store.execute(any(GetSchema.class), any(Context.class))).thenThrow(GafferRuntimeException.class);
+
+        // When/Then
+        try {
+            validator.getSchema(op, user, store);
+            fail("Exception expected");
+        } catch (final Exception e) {
+            verify(store).execute(any(GetSchema.class), any(Context.class));
+            assertThat(e).isInstanceOf(GafferRuntimeException.class);
+        }
+    }
+}