[GitHub] [jackrabbit-oak] stefan-egli commented on a diff in pull request #1021: OAK-10347 : Adding small util class for exporting a tree as flat file

["stefan-egli (via GitHub)" <gi...@apache.org>]

stefan-egli commented on code in PR #1021:
URL: https://github.com/apache/jackrabbit-oak/pull/1021#discussion_r1262300881


##########
oak-run-commons/src/main/java/org/apache/jackrabbit/oak/index/indexer/document/flatfile/SimpleFlatFileUtil.java:
##########
@@ -0,0 +1,109 @@
+/*
+ * 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.jackrabbit.oak.index.indexer.document.flatfile;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.function.Predicate;
+
+import org.apache.jackrabbit.oak.index.indexer.document.NodeStateEntry;
+import org.apache.jackrabbit.oak.plugins.document.DocumentNodeState;
+import org.apache.jackrabbit.oak.spi.state.ChildNodeEntry;
+import org.apache.jackrabbit.oak.spi.state.NodeState;
+import org.apache.jackrabbit.oak.spi.state.NodeStateUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * This util class can be used to export a tree (eg entire repository) to a flat
+ * file, without index dependency/involvement.
+ */
+public class SimpleFlatFileUtil {
+
+    private static final Logger log = LoggerFactory.getLogger(SimpleFlatFileUtil.class);
+
+    private static final String LINE_SEPARATOR = System.getProperty("line.separator");
+
+    private final FileWriter fw;
+    private final BufferedWriter bw;
+    private final ArrayList<StateInBytesHolder> entryBatch = new ArrayList<>();
+    private final Predicate<String> pathPredicate = path -> true;
+    private final NodeStateEntryWriter entryWriter;
+    private long totalLines = 0;
+
+    private SimpleFlatFileUtil(File f) throws IOException {
+        // blobStore is only used for deserialization - so pass null here:
+        entryWriter = new NodeStateEntryWriter(null);
+        fw = new FileWriter(f);
+        bw = new BufferedWriter(fw);
+    }
+
+    public static void createFlatFileFor(NodeState ns, File f) throws IOException {
+        final SimpleFlatFileUtil h = new SimpleFlatFileUtil(f);
+        log.info("createFlatFileFor : writing to {}", f.getCanonicalPath());
+        h.addEntryAndTraverseChildren(ns);
+        h.close();

Review Comment:
   +1, I'll fix that



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