Package ucar.nc2.thredds

Class ThreddsDataFactory

java.lang.Object

ucar.nc2.thredds.ThreddsDataFactory

public class ThreddsDataFactory
extends Object

This tries to translate a THREDDS InvDataset into a data object that can be used, either as a NetcdfDataset or as a FeatureDataset.

As input, it can take

1. An InvAccess object.
2. An InvDataset object. If the InvDataset has more that one InvAccess, it has to try to choose which to use, based on what Service type we know how to work with.
3. A url of the form [thredds:]catalog.xml#datasetId. In this case it opens the catalog, and looks for the InvDataset with the given datasetId.
4. A url of the form thredds:resolve:resolveURL. In this case it expects that the URL will return a catalog with a single top level dataset, which is the "resolved" dataset.

It annotates the NetcdfDataset with info from the InvDataset.

You can reuse a ThreddsDataFactory, but only within a single thread.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ThreddsDataFactory.Result	The result of trying to open a THREDDS dataset.

Field Summary

Fields

Modifier and Type	Field	Description
static String	PROTOCOL
static String	SCHEME

Constructor Summary

Constructors

Constructor	Description
ThreddsDataFactory()

Method Summary

Modifier and Type	Method	Description
static void	annotate(InvDataset ds, ucar.nc2.dataset.NetcdfDataset ncDataset)	Add information from the InvDataset to the NetcdfDataset.
InvAccess	chooseDatasetAccess(List<InvAccess> accessList)	Find the "best" access in case theres more than one, based on what the CDM knows how to open and use.
ucar.nc2.dataset.NetcdfDataset	openDataset(String location, boolean acquire, ucar.nc2.util.CancelTask task, Formatter log)	Open a NetcdfDataset from a URL location string.
ucar.nc2.dataset.NetcdfDataset	openDataset(InvAccess access, boolean acquire, ucar.nc2.util.CancelTask task, Formatter log)	Try to open invAccess as a NetcdfDataset.
ucar.nc2.dataset.NetcdfDataset	openDataset(InvDataset invDataset, boolean acquire, ucar.nc2.util.CancelTask task, Formatter log)	Try to open as a NetcdfDataset.
ThreddsDataFactory.Result	openFeatureDataset(String urlString, ucar.nc2.util.CancelTask task)	Open a FeatureDataset from a URL location string.
ThreddsDataFactory.Result	openFeatureDataset(InvAccess access, ucar.nc2.util.CancelTask task)	Open a FeatureDataset from an InvAccess object.
ThreddsDataFactory.Result	openFeatureDataset(InvDataset invDataset, ucar.nc2.util.CancelTask task)	Open a FeatureDataset from an InvDataset object, deciding on which InvAccess to use.
ThreddsDataFactory.Result	openFeatureDataset(ucar.nc2.constants.FeatureType wantFeatureType, String urlString, ucar.nc2.util.CancelTask task)	Open a FeatureDataset from a URL location string, and a desired type (may by NONE or null).
ThreddsDataFactory.Result	openFeatureDataset(ucar.nc2.constants.FeatureType wantFeatureType, InvDataset invDataset, ucar.nc2.util.CancelTask task, ThreddsDataFactory.Result result)
static void	setDebugFlags(ucar.nc2.util.DebugFlags debugFlag)
static void	setPreferAccess(ServiceType... prefer)
static void	setPreferCdm(boolean prefer)

Methods inherited from class java.lang.Object

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

Field Detail

PROTOCOL

public static final String PROTOCOL

See Also:

Constant Field Values

SCHEME

public static final String SCHEME

See Also:

Constant Field Values

Constructor Detail

ThreddsDataFactory

public ThreddsDataFactory()

Method Detail

setPreferCdm

public static void setPreferCdm(boolean prefer)

setPreferAccess

public static void setPreferAccess(ServiceType... prefer)

setDebugFlags

public static void setDebugFlags(ucar.nc2.util.DebugFlags debugFlag)

openFeatureDataset

public ThreddsDataFactory.Result openFeatureDataset(String urlString,
                                                    ucar.nc2.util.CancelTask task)
                                             throws IOException

Open a FeatureDataset from a URL location string. Example URLS:

• http://localhost:8080/test/addeStationDataset.xml#surfaceHourly
• thredds:http://localhost:8080/test/addeStationDataset.xml#surfaceHourly
• thredds://localhost:8080/test/addeStationDataset.xml#surfaceHourly
• thredds:file:c:/test/data/catalog/addeStationDataset.xml#AddeSurfaceData (absolute file)
• thredds:resolve:resolveURL

Parameters:

urlString - [thredds:]catalog.xml#datasetId

task - may be null

Returns:

ThreddsDataFactory.Result check fatalError for validity

Throws:

IOException - on read error

openFeatureDataset

public ThreddsDataFactory.Result openFeatureDataset(ucar.nc2.constants.FeatureType wantFeatureType,
                                                    String urlString,
                                                    ucar.nc2.util.CancelTask task)
                                             throws IOException

Open a FeatureDataset from a URL location string, and a desired type (may by NONE or null).

Parameters:

wantFeatureType - desired feature type, may be NONE or null

urlString - [thredds:]catalog.xml#datasetId

task - may be null

Returns:

ThreddsDataFactory.Result check fatalError for validity

Throws:

IOException - on read error

openFeatureDataset

public ThreddsDataFactory.Result openFeatureDataset(InvDataset invDataset,
                                                    ucar.nc2.util.CancelTask task)
                                             throws IOException

Open a FeatureDataset from an InvDataset object, deciding on which InvAccess to use.

Parameters:

invDataset - use this to figure out what type, how to open, etc

task - allow user to cancel; may be null

Returns:

ThreddsDataFactory.Result check fatalError for validity

Throws:

IOException - on read error

openFeatureDataset

public ThreddsDataFactory.Result openFeatureDataset(ucar.nc2.constants.FeatureType wantFeatureType,
                                                    InvDataset invDataset,
                                                    ucar.nc2.util.CancelTask task,
                                                    ThreddsDataFactory.Result result)
                                             throws IOException

Throws:

IOException

openFeatureDataset

public ThreddsDataFactory.Result openFeatureDataset(InvAccess access,
                                                    ucar.nc2.util.CancelTask task)
                                             throws IOException

Open a FeatureDataset from an InvAccess object.

Parameters:

access - use this InvAccess.

task - may be null

Returns:

ThreddsDataFactory.Result check fatalError for validity

Throws:

IOException - on read error

openDataset

public ucar.nc2.dataset.NetcdfDataset openDataset(String location,
                                                  boolean acquire,
                                                  ucar.nc2.util.CancelTask task,
                                                  Formatter log)
                                           throws IOException

Open a NetcdfDataset from a URL location string. Example URLS:

• http://localhost:8080/test/addeStationDataset.xml#surfaceHourly
• thredds:http://localhost:8080/test/addeStationDataset.xml#surfaceHourly
• thredds://localhost:8080/test/addeStationDataset.xml#surfaceHourly
• thredds:file:c:/dev/netcdf-java-2.2/test/data/catalog/addeStationDataset.xml#AddeSurfaceData (absolute file)
• thredds:resolve:resolveURL

Parameters:

location - catalog.xml#datasetId, may optionally start with "thredds:"

task - may be null

log - error messages gp here, may be null

acquire - if true, aquire the dataset, else open it

Returns:

NetcdfDataset

Throws:

IOException - on read error

openDataset

public ucar.nc2.dataset.NetcdfDataset openDataset(InvDataset invDataset,
                                                  boolean acquire,
                                                  ucar.nc2.util.CancelTask task,
                                                  Formatter log)
                                           throws IOException

Try to open as a NetcdfDataset.

Parameters:

invDataset - open this

acquire - if true, aquire the dataset, else open it

task - may be null

log - error message, may be null

Returns:

NetcdfDataset or null if failure

Throws:

IOException - on read error

openDataset

public ucar.nc2.dataset.NetcdfDataset openDataset(InvAccess access,
                                                  boolean acquire,
                                                  ucar.nc2.util.CancelTask task,
                                                  Formatter log)
                                           throws IOException

Try to open invAccess as a NetcdfDataset.

Parameters:

access - open this InvAccess

acquire - if true, aquire the dataset, else open it

task - may be null

log - error message, may be null

Returns:

NetcdfDataset or null if failure

Throws:

IOException - on read error

chooseDatasetAccess

public InvAccess chooseDatasetAccess(List<InvAccess> accessList)

Find the "best" access in case theres more than one, based on what the CDM knows how to open and use.

Parameters:

accessList - choose from this list.

Returns:

best access method.

annotate

public static void annotate(InvDataset ds,
                            ucar.nc2.dataset.NetcdfDataset ncDataset)

Add information from the InvDataset to the NetcdfDataset.

Parameters:

ds - get info from here

ncDataset - add to here