nandakumar131 commented on code in PR #3885:
URL: https://github.com/apache/ozone/pull/3885#discussion_r1009761911


##########
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/snapshot/SnapshotDiffReport.java:
##########
@@ -0,0 +1,157 @@
+/*
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.hadoop.ozone.om.snapshot;
+
+import java.util.Collections;
+import java.util.List;
+
+public class SnapshotDiffReport {
+
+  private final static String LINE_SEPARATOR = System.getProperty(
+      "line.separator", "\n");
+
+  /**
+   * Types of the difference, which include CREATE, MODIFY, DELETE, and RENAME.
+   * Each type has a label for representation:
+   * +  CREATE
+   * M  MODIFY
+   * -  DELETE
+   * R  RENAME
+   */
+  public enum DiffType {
+    CREATE("+"),
+    MODIFY("M"),
+    DELETE("-"),
+    RENAME("R");
+
+    private final String label;
+
+    DiffType(String label) {
+      this.label = label;
+    }
+
+    public String getLabel() {
+      return label;
+    }
+  }
+
+  public static class DiffReportEntry {
+
+    /**
+     * The type of diff.
+     */
+    private final DiffType type;
+
+    /**
+     * Source File/Object path.
+     */
+    private final String sourcePath;
+
+    /**
+     * Destination File/Object path, if this is a re-name operation.
+     */
+    private final String targetPath;
+
+    private DiffReportEntry(final DiffType type, final String sourcePath,
+                           final String targetPath) {
+      this.type = type;
+      this.sourcePath = sourcePath;
+      this.targetPath = targetPath;
+    }
+
+    public static DiffReportEntry of(final DiffType type,
+                                     final String sourcePath) {
+      return of(type, sourcePath, null);
+    }
+
+    public static DiffReportEntry of(final DiffType type,
+                                     final String sourcePath,
+                                     final String targetPath) {
+      return new DiffReportEntry(type, sourcePath, null);

Review Comment:
   Fixed it. Thanks for catching this.



##########
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/snapshot/SnapshotDiffReport.java:
##########
@@ -0,0 +1,157 @@
+/*
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.hadoop.ozone.om.snapshot;
+
+import java.util.Collections;
+import java.util.List;
+
+public class SnapshotDiffReport {
+
+  private final static String LINE_SEPARATOR = System.getProperty(
+      "line.separator", "\n");
+
+  /**
+   * Types of the difference, which include CREATE, MODIFY, DELETE, and RENAME.
+   * Each type has a label for representation:
+   * +  CREATE
+   * M  MODIFY
+   * -  DELETE
+   * R  RENAME
+   */
+  public enum DiffType {
+    CREATE("+"),
+    MODIFY("M"),
+    DELETE("-"),
+    RENAME("R");
+
+    private final String label;
+
+    DiffType(String label) {
+      this.label = label;
+    }
+
+    public String getLabel() {
+      return label;
+    }
+  }
+
+  public static class DiffReportEntry {
+
+    /**
+     * The type of diff.
+     */
+    private final DiffType type;
+
+    /**
+     * Source File/Object path.
+     */
+    private final String sourcePath;
+
+    /**
+     * Destination File/Object path, if this is a re-name operation.
+     */
+    private final String targetPath;
+
+    private DiffReportEntry(final DiffType type, final String sourcePath,
+                           final String targetPath) {

Review Comment:
   Fixed.
   



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