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[English](./README.md) | [中文](./README-zh.md)
# TsFile Java Document
<p align="center">
  <img src="https://www.apache.org/logos/originals/tsfile.svg"
       alt="TsFile Logo"
       width="400"/>
</p>

## Use TsFile

### Add TsFile as a dependency in Maven

The current version is `2.1.0`

```xml  
<dependencies>
    <dependency>
      <groupId>org.apache.tsfile</groupId>
      <artifactId>tsfile</artifactId>
      <version>2.1.0</version>
    </dependency>
<dependencies>
```

### TsFile Java API

#### Write Data

Data written is through TsFileWriter.

1. Construct TsFileWriter

 
    ```java
    File f = new File("test.tsfile");
    TsFileWriter tsFileWriter = new TsFileWriter(f);
    ```

2. Register timeseries
  
    ```java
    List<IMeasurementSchema> schema1 = new ArrayList<>();
    schema1.add(new MeasurementSchema("voltage", TSDataType.FLOAT));
    schema1.add(new MeasurementSchema("electricity", TSDataType.FLOAT));
    tsFileWriter.registerTimeseries(new Path("solarpanel1"), schema1);
   
     List<IMeasurementSchema> schema2 = new ArrayList<>();
    schema2.add(new MeasurementSchema("voltage", TSDataType.FLOAT));
    schema2.add(new MeasurementSchema("electricity", TSDataType.FLOAT));
    schema2.add(new MeasurementSchema("windspeed", TSDataType.FLOAT));
    tsFileWriter.registerTimeseries(new Path("turbine1"), schema2);
    ```

3. Write data

    ```java
    TSRecord tsRecord = new TSRecord(1, "solarpanel1");
    tsRecord.addTuple(DataPoint.getDataPoint(TSDataType.FLOAT, "voltage", 1.1f));
    tsRecord.addTuple(DataPoint.getDataPoint(TSDataType.FLOAT, "electricity", 2.2f));
    tsFileWriter.write(tsRecord);
    ```

4. Close TsFileWriter, only closed TsFile could be queried.

    ```java
    tsFileWriter.close();
    ```

Write TsFile Example

[Write Data By TSRecord](../examples/src/main/java/org/apache/tsfile/TsFileWriteAlignedWithTSRecord.java)。

[Write Data By Tablet](../examples/src/main/java/org/apache/tsfile/TsFileWriteAlignedWithTablet.java)。


#### Read TsFile

Data query is through TsFileReader.

1. Construct TsFileReader

   ```java
   TsFileSequenceReader reader = new TsFileSequenceReader(path);
   TsFileReader tsFileReader = new TsFileReader(reader)；
   ```

2. Construct query expression, including predicate and filter

      ```java
      ArrayList<Path> paths = new ArrayList<>();
      paths.add(new Path("solarpanel1", "voltage"));
      paths.add(new Path("solarpanel1", "electricity"));
   
      IExpression timeFilter = BinaryExpression.and(
      new GlobalTimeExpression(TimeFilterApi.gtEq(1L)),
      new GlobalTimeExpression(TimeFilterApi.ltEq(10L)));
   
      QueryExpression queryExpression = QueryExpression.create(paths, timeFilter);
      ```

3. Query data

   ```java
   QueryDataSet queryDataSet = readTsFile.query(queryExpression);
   while (queryDataSet.hasNext()) {
        queryDataSet.next();
   }
   ```

4. Close TsFileReader

   ```java
   tsFileReader.close();
   ```



Read TsFile Example

[Query Data](../examples/src/main/java/org/apache/tsfile/TsFileRead.java)

[Scan whole TsFile](../examples/src/main/java/org/apache/tsfile/TsFileSequenceRead.java)


## Building With Java

### Prerequisites

To build TsFile wirh Java, you need to have:

1. Java >= 1.8 (1.8, 11 to 17 are verified. Please make sure the environment path has been set accordingly).
2. Maven >= 3.6.3 (If you want to compile TsFile from source code).


### Build TsFile with Maven

```
mvn clean package -P with-java -DskipTests
```

### Install to local machine

```
mvn install -P with-java -DskipTests
```
