Package thredds.crawlabledataset

Class CrawlableDatasetAlias

java.lang.Object

thredds.crawlabledataset.CrawlableDatasetAlias

All Implemented Interfaces:

CrawlableDataset

public class CrawlableDatasetAlias
extends Object
implements CrawlableDataset

An alias for a collection of datasets (i.e., the dataset path contains one or more wildcard characters ("*")).

Since:

Jun 21, 2005T4:53:43 PM

Constructor Summary

Constructors

Constructor	Description
CrawlableDatasetAlias(String path, String className, Object configObj)

Method Summary

Modifier and Type	Method	Description
boolean	exists()	Return true if the dataset represented by this CrawlableDataset actually exists, null if it does not or an I/O error occurs.
Object	getConfigObject()	Return the configuration Object (can be null).
CrawlableDataset	getDescendant(String childPath)	Return the requested descendant of this dataset.
String	getName()	Returns the name (unlike a CrawlableDataset, the name may not be related to the path).
CrawlableDataset	getParentDataset()	Returns the parent CrawlableDataset or null if this dataset has no parent.
String	getPath()	Returns the dataset path.
static boolean	isAlias(String path)
boolean	isCollection()	Return true if the dataset is a collection dataset.
Date	lastModified()	Returns the date the dataset was last modified, null if unknown.
long	length()	Returns the size in bytes of the dataset, -1 if unknown.
List<CrawlableDataset>	listDatasets()	Returns the list of CrawlableDatasets contained in this collection dataset.
List<CrawlableDataset>	listDatasets(CrawlableDatasetFilter filter)	Returns the list of CrawlableDatasets contained in this collection dataset that satisfy the given filter.

Methods inherited from class java.lang.Object

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

Constructor Detail

CrawlableDatasetAlias

public CrawlableDatasetAlias(String path,
                             String className,
                             Object configObj)

Method Detail

isAlias

public static boolean isAlias(String path)

getConfigObject

public Object getConfigObject()

Description copied from interface: CrawlableDataset

Return the configuration Object (can be null).

Specified by:

getConfigObject in interface CrawlableDataset

Returns:

the configuration Object (can be null).

getPath

public String getPath()

Description copied from interface: CrawlableDataset

Returns the dataset path.

Specified by:

getPath in interface CrawlableDataset

Returns:

the dataset path.

getName

public String getName()

Returns the name (unlike a CrawlableDataset, the name may not be related to the path).

Specified by:

getName in interface CrawlableDataset

Returns:

the dataset name, i.e., the last part of the dataset path.

exists

public boolean exists()

Description copied from interface: CrawlableDataset

Return true if the dataset represented by this CrawlableDataset actually exists, null if it does not or an I/O error occurs.

Specified by:

exists in interface CrawlableDataset

Returns:

true if the dataset represented by this CrawlableDataset actually exists.

isCollection

public boolean isCollection()

Description copied from interface: CrawlableDataset

Return true if the dataset is a collection dataset.

Specified by:

isCollection in interface CrawlableDataset

Returns:

true if the dataset is a collection dataset.

getDescendant

public CrawlableDataset getDescendant(String childPath)

Description copied from interface: CrawlableDataset

Return the requested descendant of this dataset.

Specified by:

getDescendant in interface CrawlableDataset

Parameters:

childPath - the path, relative to this dataset, of the requested dataset.

Returns:

the requested descendant of this dataset.

getParentDataset

public CrawlableDataset getParentDataset()

Description copied from interface: CrawlableDataset

Returns the parent CrawlableDataset or null if this dataset has no parent.

Specified by:

getParentDataset in interface CrawlableDataset

Returns:

the parent CrawlableDataset or null if this dataset has no parent.

listDatasets

public List<CrawlableDataset> listDatasets()
                                    throws IOException

Description copied from interface: CrawlableDataset

Returns the list of CrawlableDatasets contained in this collection dataset. The returned list will be empty if this collection dataset does not contain any children datasets. If this dataset is not a collection dataset, this method returns null.

Specified by:

listDatasets in interface CrawlableDataset

Returns:

Returns a list of the CrawlableDatasets contained in this collection dataset. The llist will be empty if no datasets are contained in this collection dataset.

Throws:

IOException - if an I/O error occurs while accessing the children datasets.

listDatasets

public List<CrawlableDataset> listDatasets(CrawlableDatasetFilter filter)
                                    throws IOException

Description copied from interface: CrawlableDataset

Returns the list of CrawlableDatasets contained in this collection dataset that satisfy the given filter. The returned list will be empty if this collection dataset does not contain any children datasets that satisfy the given filter.

Specified by:

listDatasets in interface CrawlableDataset

Parameters:

filter - a CrawlableDataset filter (if null, accept all datasets).

Returns:

Returns a list of the CrawlableDatasets contained in this collection dataset that satisfy the given filter. The list will be empty if no datasets are contained in this collection dataset.

Throws:

IOException - if an I/O error occurs while accessing the children datasets.

length

public long length()

Description copied from interface: CrawlableDataset

Returns the size in bytes of the dataset, -1 if unknown.

Specified by:

length in interface CrawlableDataset

Returns:

the size in bytes of the dataset, -1 if unknown.

lastModified

public Date lastModified()

Description copied from interface: CrawlableDataset

Returns the date the dataset was last modified, null if unknown.

Specified by:

lastModified in interface CrawlableDataset

Returns:

the date the dataset was last modified, null if unknown.