Add CheckpointStatistics to increase inner class visibility

Author: mxm

flink-kubernetes-operator/src/main/java/org/apache/flink/runtime/rest/messages/checkpoints/CheckpointStatisticDetailsHeaders.java

@@ -0,0 +1,77 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.flink.runtime.rest.messages.checkpoints;
+
+import org.apache.flink.runtime.rest.HttpMethodWrapper;
+import org.apache.flink.runtime.rest.messages.EmptyRequestBody;
+import org.apache.flink.runtime.rest.messages.RuntimeMessageHeaders;
+
+import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponseStatus;
+
+/** Copied over for CheckpointStatistics to work. See CheckpointStatistics. */
+public class CheckpointStatisticDetailsHeaders
+        implements RuntimeMessageHeaders<
+                EmptyRequestBody, CheckpointStatistics, CheckpointMessageParameters> {
+
+    private static final CheckpointStatisticDetailsHeaders INSTANCE =
+            new CheckpointStatisticDetailsHeaders();
+
+    public static final String URL = "/jobs/:jobid/checkpoints/details/:checkpointid";
+
+    private CheckpointStatisticDetailsHeaders() {}
+
+    @Override
+    public Class<EmptyRequestBody> getRequestClass() {
+        return EmptyRequestBody.class;
+    }
+
+    @Override
+    public Class<CheckpointStatistics> getResponseClass() {
+        return CheckpointStatistics.class;
+    }
+
+    @Override
+    public HttpResponseStatus getResponseStatusCode() {
+        return HttpResponseStatus.OK;
+    }
+
+    @Override
+    public CheckpointMessageParameters getUnresolvedMessageParameters() {
+        return new CheckpointMessageParameters();
+    }
+
+    @Override
+    public HttpMethodWrapper getHttpMethod() {
+        return HttpMethodWrapper.GET;
+    }
+
+    @Override
+    public String getTargetRestEndpointURL() {
+        return URL;
+    }
+
+    public static CheckpointStatisticDetailsHeaders getInstance() {
+        return INSTANCE;
+    }
+
+    @Override
+    public String getDescription() {
+        return "Returns details for a checkpoint.";
+    }
+}