com.twitter.elephantbird.util
Class ColumnarMetadata

java.lang.Object
  com.twitter.elephantbird.util.ColumnarMetadata

public class ColumnarMetadata
extends Object

Metadata stored with columnar storage like Hive's RCFile

This is a DynamicMessage equivalent of following protobuf :

 message ColumnarMetadata {
   optional string   classname   = 1;                // FYI only, not used.
   repeated int32    fieldId     = 2;                // list of field ids stored
   optional int32    nesting     = 3 [default = 0];  // when nesting is used
 };
 

Method Summary

String	getClassname()
int	getFieldId(int index)
List<Integer>	getFieldIdList()
com.google.protobuf.Message	getMessage()
int	getNesting()
static ColumnarMetadata	newInstance(String classname, List<Integer> fieldIdList)
static ColumnarMetadata	newInstance(String classname, List<Integer> fieldIdList, int nesting)
static ColumnarMetadata	parseFrom(byte[] messageBuffer)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getMessage

public com.google.protobuf.Message getMessage()

getClassname

public String getClassname()

getNesting

public int getNesting()

getFieldId

public int getFieldId(int index)

getFieldIdList

public List<Integer> getFieldIdList()

newInstance

public static ColumnarMetadata newInstance(String classname,
                                           List<Integer> fieldIdList)

newInstance

public static ColumnarMetadata newInstance(String classname,
                                           List<Integer> fieldIdList,
                                           int nesting)

parseFrom

public static ColumnarMetadata parseFrom(byte[] messageBuffer)
                                  throws com.google.protobuf.InvalidProtocolBufferException

Throws:

com.google.protobuf.InvalidProtocolBufferException