org.apache.hawq.pxf.api

Class MetadataFetcher

java.lang.Object

org.apache.hawq.pxf.api.utilities.Plugin

org.apache.hawq.pxf.api.MetadataFetcher

Direct Known Subclasses:

HiveMetadataFetcher

public abstract class MetadataFetcher
extends Plugin

Abstract class that defines getting metadata.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.List<Metadata>	metadata

Fields inherited from class org.apache.hawq.pxf.api.utilities.Plugin

inputData

Constructor Summary

Constructors

Constructor and Description
MetadataFetcher(InputData metaData) Constructs a MetadataFetcher.

Method Summary

Modifier and Type	Method and Description
abstract java.util.List<Metadata>	getMetadata(java.lang.String pattern) Gets a metadata of a given item

Methods inherited from class org.apache.hawq.pxf.api.utilities.Plugin

isThreadSafe

Methods inherited from class java.lang.Object

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

Field Detail

metadata

protected java.util.List<Metadata> metadata

Constructor Detail

MetadataFetcher

public MetadataFetcher(InputData metaData)

Constructs a MetadataFetcher.

Parameters:

metaData - the input data

Method Detail

getMetadata

public abstract java.util.List<Metadata> getMetadata(java.lang.String pattern)
                                              throws java.lang.Exception

Gets a metadata of a given item

Parameters:

pattern - table/file name or pattern

Returns:

metadata of all items corresponding to given pattern

Throws:

java.lang.Exception - if metadata information could not be retrieved