Import code from internal repository to git

java/com/google/domain/registry/flows/ResourceQueryFlow.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// 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.google.domain.registry.flows;
+
+import static com.google.domain.registry.flows.ResourceFlowUtils.verifyAuthInfoForResource;
+
+import com.google.domain.registry.flows.EppException.ObjectDoesNotExistException;
+import com.google.domain.registry.model.EppResource;
+import com.google.domain.registry.model.eppinput.ResourceCommand.SingleResourceCommand;
+import com.google.domain.registry.util.TypeUtils.TypeInstantiator;
+
+/**
+ * An EPP flow that queries a storable resource.
+ *
+ * @param <R> the resource type being queried
+ * @param <C> the command type, marshalled directly from the epp xml
+ */
+public abstract class ResourceQueryFlow<R extends EppResource, C extends SingleResourceCommand>
+    extends SingleResourceFlow<R, C> {
+  /** Fail if the object doesn't exist or was deleted. */
+  @Override
+  protected final void verifyIsAllowed() throws EppException {
+    if (existingResource == null) {
+      throw new ResourceToQueryDoesNotExistException(
+          new TypeInstantiator<R>(getClass()){}.getExactType(), targetId);
+    }
+    if (command.getAuthInfo() != null) {
+      verifyAuthInfoForResource(command.getAuthInfo(), existingResource);
+    }
+    verifyQueryIsAllowed();
+  }
+
+  /** Check command- and resource-specific invariants before allowing the query to proceed. */
+  @SuppressWarnings("unused")
+  protected void verifyQueryIsAllowed() throws EppException {}
+
+  /** Resource with this id does not exist. */
+  public static class ResourceToQueryDoesNotExistException extends ObjectDoesNotExistException {
+    public ResourceToQueryDoesNotExistException(Class<?> type, String targetId) {
+      super(type, targetId);
+    }
+  }
+}