qiaojialin commented on a change in pull request #258: [IOTDB-143]Development 
of merge
URL: https://github.com/apache/incubator-iotdb/pull/258#discussion_r313735585
 
 

 ##########
 File path: server/src/main/java/org/apache/iotdb/db/utils/MergeUtils.java
 ##########
 @@ -0,0 +1,354 @@
+/**
+ * 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.iotdb.db.utils;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.PriorityQueue;
+import java.util.Set;
+import org.apache.iotdb.db.engine.merge.manage.MergeResource;
+import org.apache.iotdb.db.engine.modification.Modification;
+import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
+import org.apache.iotdb.tsfile.file.metadata.ChunkMetaData;
+import org.apache.iotdb.tsfile.file.metadata.TsDeviceMetadataIndex;
+import org.apache.iotdb.tsfile.file.metadata.TsFileMetaData;
+import org.apache.iotdb.tsfile.read.TsFileSequenceReader;
+import org.apache.iotdb.tsfile.read.common.BatchData;
+import org.apache.iotdb.tsfile.read.common.Chunk;
+import org.apache.iotdb.tsfile.read.common.Path;
+import org.apache.iotdb.tsfile.read.reader.chunk.ChunkReader;
+import org.apache.iotdb.tsfile.read.reader.chunk.ChunkReaderWithoutFilter;
+import org.apache.iotdb.tsfile.write.chunk.IChunkWriter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class MergeUtils {
+
+  private static final Logger logger = 
LoggerFactory.getLogger(MergeUtils.class);
+
+  private MergeUtils() {
+    // util class
+  }
+  
+  public static void writeTVPair(TimeValuePair timeValuePair, IChunkWriter 
chunkWriter) {
+    switch (chunkWriter.getDataType()) {
+      case TEXT:
+        chunkWriter.write(timeValuePair.getTimestamp(), 
timeValuePair.getValue().getBinary());
+        break;
+      case DOUBLE:
+        chunkWriter.write(timeValuePair.getTimestamp(), 
timeValuePair.getValue().getDouble());
+        break;
+      case BOOLEAN:
+        chunkWriter.write(timeValuePair.getTimestamp(), 
timeValuePair.getValue().getBoolean());
+        break;
+      case INT64:
+        chunkWriter.write(timeValuePair.getTimestamp(), 
timeValuePair.getValue().getLong());
+        break;
+      case INT32:
+        chunkWriter.write(timeValuePair.getTimestamp(), 
timeValuePair.getValue().getInt());
+        break;
+      case FLOAT:
+        chunkWriter.write(timeValuePair.getTimestamp(), 
timeValuePair.getValue().getFloat());
+        break;
+      default:
+        throw new UnsupportedOperationException("Unknown data type " + 
chunkWriter.getDataType());
+    }
+  }
+
+  /**
+   * Collect all paths contained in the all SeqFiles and UnseqFiles in a merge 
and sort them
+   * before return.
+   * @param resource
+   * @return all paths contained in the merge.
+   * @throws IOException
+   */
+  public static List<Path> collectPaths(MergeResource resource)
+      throws IOException {
+    Set<Path> pathSet = new HashSet<>();
+    for (TsFileResource tsFileResource : resource.getUnseqFiles()) {
+      TsFileSequenceReader sequenceReader = 
resource.getFileReader(tsFileResource);
+      
resource.getMeasurementSchemaMap().putAll(sequenceReader.readFileMetadata().getMeasurementSchema());
+      pathSet.addAll(collectFileSeries(sequenceReader));
+    }
+    for (TsFileResource tsFileResource : resource.getSeqFiles()) {
+      TsFileSequenceReader sequenceReader = 
resource.getFileReader(tsFileResource);
+      
resource.getMeasurementSchemaMap().putAll(sequenceReader.readFileMetadata().getMeasurementSchema());
+      pathSet.addAll(collectFileSeries(sequenceReader));
+    }
+    List<Path> ret = new ArrayList<>(pathSet);
+    ret.sort(Comparator.comparing(Path::getFullPath));
+    return ret;
+  }
+
+  private static List<Path> collectFileSeries(TsFileSequenceReader 
sequenceReader) throws IOException {
+    TsFileMetaData metaData = sequenceReader.readFileMetadata();
+    Set<String> deviceIds = metaData.getDeviceMap().keySet();
+    Set<String> measurements = metaData.getMeasurementSchema().keySet();
+    List<Path> paths = new ArrayList<>();
+    for (String deviceId : deviceIds) {
+      for (String measurement : measurements) {
+        paths.add(new Path(deviceId, measurement));
+      }
+    }
+    return paths;
+  }
+
+  public static long collectFileSizes(List<TsFileResource> seqFiles, 
List<TsFileResource> unseqFiles) {
+    long totalSize = 0;
+    for (TsFileResource tsFileResource : seqFiles) {
+      totalSize += tsFileResource.getFileSize();
+    }
+    for (TsFileResource tsFileResource : unseqFiles) {
+      totalSize += tsFileResource.getFileSize();
+    }
+    return totalSize;
+  }
+
+  public static int writeChunkWithoutUnseq(Chunk chunk, IChunkWriter 
chunkWriter) throws IOException {
 
 Review comment:
   How about rename to  writeChunk

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