gov.nasa.pds.harvest.crawler.metadata.extractor

Class Pds4MetExtractor

java.lang.Object

gov.nasa.pds.harvest.crawler.metadata.extractor.Pds4MetExtractor

All Implemented Interfaces:

gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Direct Known Subclasses:

BundleMetExtractor, CollectionMetExtractor

public class Pds4MetExtractor
extends Object
implements gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Class to extract metadata from a PDS4 XML file.

Author:

mcayanan

Field Summary

Fields

Modifier and Type	Field and Description
protected Pds4MetExtractorConfig	config A metadata extraction configuration.
protected XMLExtractor	extractor An XMLExtractor to get the metadata.

Constructor Summary

Constructors

Constructor and Description
Pds4MetExtractor(Pds4MetExtractorConfig config) Default constructor.

Method Summary

Methods

Modifier and Type	Method and Description
gov.nasa.jpl.oodt.cas.metadata.Metadata	extractMetadata(File product) Extract the metadata
gov.nasa.jpl.oodt.cas.metadata.Metadata	extractMetadata(File product, File configFile) No need to be implemented.
gov.nasa.jpl.oodt.cas.metadata.Metadata	extractMetadata(File product, gov.nasa.jpl.oodt.cas.metadata.MetExtractorConfig config) No need to be implemented.
gov.nasa.jpl.oodt.cas.metadata.Metadata	extractMetadata(File product, String configFile) No need to be implemented.
protected List<Slot>	extractMetadata(List<XPath> xPaths) Extracts metadata
gov.nasa.jpl.oodt.cas.metadata.Metadata	extractMetadata(String product) Extract the metadata.
gov.nasa.jpl.oodt.cas.metadata.Metadata	extractMetadata(URL product) Extract the metadata.
gov.nasa.jpl.oodt.cas.metadata.Metadata	extractMetadata(URL product, gov.nasa.jpl.oodt.cas.metadata.MetExtractorConfig config) No need to be implemented.
protected List<ReferenceEntry>	getReferences(List<net.sf.saxon.tree.tiny.TinyElementImpl> references, File product) Extracts the metadata found in an association entry.
void	setConfigFile(File configFile) No need to be implemented.
void	setConfigFile(gov.nasa.jpl.oodt.cas.metadata.MetExtractorConfig config)
void	setConfigFile(String configFile) No need to be implemented.

Methods inherited from class java.lang.Object

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

Field Detail

config

protected Pds4MetExtractorConfig config

A metadata extraction configuration.

extractor

protected XMLExtractor extractor

An XMLExtractor to get the metadata.

Constructor Detail

Pds4MetExtractor

public Pds4MetExtractor(Pds4MetExtractorConfig config)

Default constructor.

Parameters:

config - The configuration that contains what metadata and what object types to extract.

Method Detail

extractMetadata

public gov.nasa.jpl.oodt.cas.metadata.Metadata extractMetadata(File product)
                                                        throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

Extract the metadata

Specified by:

extractMetadata in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Parameters:

product - A PDS4 xml file

Returns:

a class representation of the extracted metadata

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException - If an error occured while performing metadata extraction.

extractMetadata

protected List<Slot> extractMetadata(List<XPath> xPaths)
                              throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

Extracts metadata

Parameters:

xPaths - A list of xpath expressions.

Returns:

A list of Slots that contain the extracted metadata.

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException - If a bad xPath expression was encountered.

getReferences

protected List<ReferenceEntry> getReferences(List<net.sf.saxon.tree.tiny.TinyElementImpl> references,
                                 File product)
                                      throws XPathExpressionException,
                                             gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

Extracts the metadata found in an association entry.

Parameters:

references - A list of association entries.

product - The product.

Returns:

A list of ReferenceEntry objects, which holds the association metadata.

Throws:

XPathExpressionException - If there was an invalid XPath expression.

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

extractMetadata

public gov.nasa.jpl.oodt.cas.metadata.Metadata extractMetadata(String product)
                                                        throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

Extract the metadata.

Specified by:

extractMetadata in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Parameters:

product - A PDS4 xml file.

Returns:

a class representation of the extracted metadata.

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

extractMetadata

public gov.nasa.jpl.oodt.cas.metadata.Metadata extractMetadata(URL product)
                                                        throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

Extract the metadata.

Specified by:

extractMetadata in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Parameters:

product - A PDS4 xml file.

Returns:

a class representation of the extracted metadata.

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

extractMetadata

public gov.nasa.jpl.oodt.cas.metadata.Metadata extractMetadata(File product,
                                                      File configFile)
                                                        throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

No need to be implemented.

Specified by:

extractMetadata in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

extractMetadata

public gov.nasa.jpl.oodt.cas.metadata.Metadata extractMetadata(File product,
                                                      String configFile)
                                                        throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

No need to be implemented.

Specified by:

extractMetadata in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

extractMetadata

public gov.nasa.jpl.oodt.cas.metadata.Metadata extractMetadata(File product,
                                                      gov.nasa.jpl.oodt.cas.metadata.MetExtractorConfig config)
                                                        throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

No need to be implemented.

Specified by:

extractMetadata in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

extractMetadata

public gov.nasa.jpl.oodt.cas.metadata.Metadata extractMetadata(URL product,
                                                      gov.nasa.jpl.oodt.cas.metadata.MetExtractorConfig config)
                                                        throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

No need to be implemented.

Specified by:

extractMetadata in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

setConfigFile

public void setConfigFile(File configFile)
                   throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

No need to be implemented.

Specified by:

setConfigFile in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

setConfigFile

public void setConfigFile(String configFile)
                   throws gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

No need to be implemented.

Specified by:

setConfigFile in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor

Throws:

gov.nasa.jpl.oodt.cas.metadata.exceptions.MetExtractionException

setConfigFile

public void setConfigFile(gov.nasa.jpl.oodt.cas.metadata.MetExtractorConfig config)

Specified by:

setConfigFile in interface gov.nasa.jpl.oodt.cas.metadata.MetExtractor