org.apache.lens.lib.query

Class AbstractFileFormatter

java.lang.Object

org.apache.lens.lib.query.AbstractOutputFormatter

org.apache.lens.lib.query.AbstractFileFormatter

All Implemented Interfaces:

Externalizable, Serializable, FileFormatter, QueryOutputFormatter

Direct Known Subclasses:

HadoopFileFormatter, ZipFileFormatter

public abstract class AbstractFileFormatter
extends AbstractOutputFormatter
implements FileFormatter

Abstract implementation of FileFormatter, which gets column details from AbstractOutputFormatter.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.lens.lib.query.AbstractOutputFormatter

HEADER_TYPE

Constructor Summary

Constructors

Constructor and Description
AbstractFileFormatter()

Method Summary

Methods

Modifier and Type	Method and Description
Long	getFileSize() Get size of the resultset file.
String	getFinalOutputPath() Get final location where formatted output is available
Integer	getNumRows() Get total number of rows in result.
void	init(QueryContext ctx, LensResultSetMetadata metadata) Initialize the formatter.
void	readExternal(ObjectInput in)
void	writeExternal(ObjectOutput out)
void	writeFooter() Write the footer.
void	writeHeader() Write the header.

Methods inherited from class org.apache.lens.lib.query.AbstractOutputFormatter

getMetadata

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.lens.lib.query.FileFormatter

getEncoding, getTmpPath, setupOutputs, writeFooter, writeHeader, writeRow

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

close, commit

Constructor Detail

AbstractFileFormatter

public AbstractFileFormatter()

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

Overrides:

init in class AbstractOutputFormatter

Parameters:

ctx - The QueryContext object

metadata - LensResultSetMetadata object

Throws:

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

getNumRows

public Integer getNumRows()

Description copied from interface: QueryOutputFormatter

Get total number of rows in result.

Specified by:

getNumRows in interface QueryOutputFormatter

Returns:

Total number of rows, return null, if not known

getFileSize

public Long getFileSize()

Description copied from interface: QueryOutputFormatter

Get size of the resultset file.

Specified by:

getFileSize in interface QueryOutputFormatter

Returns:

Total number of rows, return null, if not known

writeHeader

public void writeHeader()
                 throws IOException

Description copied from interface: QueryOutputFormatter

Write the header.

Specified by:

writeHeader in interface QueryOutputFormatter

Throws:

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

writeFooter

public void writeFooter()
                 throws IOException

Description copied from interface: QueryOutputFormatter

Write the footer.

Specified by:

writeFooter in interface QueryOutputFormatter

Throws:

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

getFinalOutputPath

public String getFinalOutputPath()

Description copied from interface: QueryOutputFormatter

Get final location where formatted output is available

Specified by:

getFinalOutputPath in interface QueryOutputFormatter

Returns:

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException