org.apache.lens.lib.query

Class AbstractOutputFormatter

java.lang.Object

org.apache.lens.lib.query.AbstractOutputFormatter

All Implemented Interfaces:

Externalizable, Serializable, QueryOutputFormatter

Direct Known Subclasses:

AbstractFileFormatter, WrappedFileFormatter

public abstract class AbstractOutputFormatter
extends Object
implements QueryOutputFormatter

Provides abstract implementation of the query output formatter.

In this it initializes column names, types column object inspectors Also provides methods to construct header from serde

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	HEADER_TYPE The Constant HEADER_TYPE.

Constructor Summary

Constructors

Constructor and Description
AbstractOutputFormatter()

Method Summary

Methods

Modifier and Type	Method and Description
LensResultSetMetadata	getMetadata() Get resultset metadata
void	init(QueryContext ctx, LensResultSetMetadata metadata) Initialize the formatter.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lens.server.api.query.QueryOutputFormatter

close, commit, getFileSize, getFinalOutputPath, getNumRows, writeFooter, writeHeader

Methods inherited from interface java.io.Externalizable

readExternal, writeExternal

Field Detail

HEADER_TYPE

public static final String HEADER_TYPE

The Constant HEADER_TYPE.

See Also:

Constant Field Values

Constructor Detail

AbstractOutputFormatter

public AbstractOutputFormatter()

Method Detail

init

public void init(QueryContext ctx,
        LensResultSetMetadata metadata)
          throws IOException

Description copied from interface: QueryOutputFormatter

Initialize the formatter.

Specified by:

init in interface QueryOutputFormatter

Parameters:

ctx - The QueryContext object

metadata - LensResultSetMetadata object

Throws:

IOException - Signals that an I/O exception has occurred.

getMetadata

public LensResultSetMetadata getMetadata()

Description copied from interface: QueryOutputFormatter

Get resultset metadata

Specified by:

getMetadata in interface QueryOutputFormatter

Returns:

LensResultSetMetadata