org.geotools.coverage.io

Interface CoverageAccess

All Known Subinterfaces:

FileCoverageAccess

All Known Implementing Classes:

DefaultCoverageAccess, DefaultFileCoverageAccess, NetCDFAccess

public interface CoverageAccess

Represents a Physical storage of coverage data (that we have a connection to).

Please note that this service may be remote (or otherwise slow). You are doing IO here and should treat this class with respect - please do not access these methods from a display thread.

Author:

Simone Giannecchini, GeoSolutions, Jody Garnett

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	CoverageAccess.AccessType Level of access supported.

Method Summary

Modifier and Type	Method and Description
CoverageSource	access(Name name, Map<String,Serializable> params, CoverageAccess.AccessType accessType, Hints hints, ProgressListener listener) Retrieve a CoverageSource to access a Named Coverage.
boolean	canCreate(Name name, Map<String,Serializable> params, Hints hints, ProgressListener listener) Test to see if this coverage access is suitable for creating a CoverageStore referred by Name, with the specified set of parameters.
boolean	canDelete(Name name, Map<String,Serializable> params, Hints hints) Test to see if this coverage access is suitable for deleting a CoverageSource referred by Name, with the specified set of parameters.
CoverageStore	create(Name name, Map<String,Serializable> params, Hints hints, ProgressListener listener) Create a CoverageStore with the specified name.
boolean	delete(Name name, Map<String,Serializable> params, Hints hints) Asks this CoverageAccess to entirely remove a certain Coverage from the available CoverageSources.
void	dispose() This will free any cached info object or header information.
Map<String,Parameter<?>>	getAccessParameterInfo(CoverageAccess.AccessType accessType) Describes the required (and optional) parameters that can be used to open a CoverageSource.
Map<String,Serializable>	getConnectParameters() Retrieves the parameters used to connect to this live instance of CoverageAccess.
int	getCoveragesNumber(ProgressListener listener) The number of Coverages made available.
Driver	getDriver() Returns the Driver which has been used to connect to this CoverageAccess.
ServiceInfo	getInfo(ProgressListener listener) Description of the CoverageAccess we are connected to here.
List<Name>	getNames(ProgressListener listener) Names of the available Coverages.
MetadataNode	getStorageMetadata(String metadataDomain)
Set<String>	getStorageMetadataDomains()
Set<CoverageAccess.AccessType>	getSupportedAccessTypes() Retrieves the Set of supported CoverageAccess.AccessTypes for this CoverageAccess instance.
boolean	isCreateSupported() Tells me whether or not this CoverageAccess supports creation of a new coverage storage.
boolean	isDeleteSupported() Tells me whether or not this CoverageAccess supports removal of an existing coverage storage.

Method Detail

getDriver

Driver getDriver()

Returns the Driver which has been used to connect to this CoverageAccess.

Returns:

Driver used to connect

getInfo

ServiceInfo getInfo(ProgressListener listener)

Description of the CoverageAccess we are connected to here.

Returns:

Description of the CoverageAccess we are connected to here.

getSupportedAccessTypes

Set<CoverageAccess.AccessType> getSupportedAccessTypes()

Retrieves the Set of supported CoverageAccess.AccessTypes for this CoverageAccess instance.

Returns:

the Set of supported CoverageAccess.AccessTypes for this CoverageAccess instance.

getNames

List<Name> getNames(ProgressListener listener)

Names of the available Coverages.

Each Coverage named here represents a unique data product that may be accessed via the CoverageSource

Returns:

Names of the available contents.

Throws:

IOException

getCoveragesNumber

int getCoveragesNumber(ProgressListener listener)

The number of Coverages made available.

Parameters:

listener -

Returns:

getNames( listener ).size()

getAccessParameterInfo

Map<String,Parameter<?>> getAccessParameterInfo(CoverageAccess.AccessType accessType)

Describes the required (and optional) parameters that can be used to open a CoverageSource.

Returns:

Param a Map describing the Map for #connect(Map).

access

CoverageSource access(Name name,
                      Map<String,Serializable> params,
                      CoverageAccess.AccessType accessType,
                      Hints hints,
                      ProgressListener listener)
               throws IOException

Retrieve a CoverageSource to access a Named Coverage.

Parameters:

Name - Indicate the coverage to access

params - Additional parameters as needed to indicate what part of the data set to access

accessType - Requested level of access

Hints - Implementation specific hints; please review the javadocs for your Driver for details

listener - used to report progress while obtianing access

Throws:

IOException

isCreateSupported

boolean isCreateSupported()

Tells me whether or not this CoverageAccess supports creation of a new coverage storage.

This method will only return true if getSupportedAccessTypes() == READ_WRITE.

Returns:

true when removal of of a new coverage storage is supported, false otherwise.

canCreate

boolean canCreate(Name name,
                  Map<String,Serializable> params,
                  Hints hints,
                  ProgressListener listener)
           throws IOException

Test to see if this coverage access is suitable for creating a CoverageStore referred by Name, with the specified set of parameters.

This method will only return true if getSupportedAccessTypes() == READ_WRITE.

Parameters:

Name - The name of the data set to create

params - Indicate the content to be created

Hints - Implementations specific Hints, please check the javadocs for your driver for details

Returns:

true if a coverage can be created

Throws:

IOException

create

CoverageStore create(Name name,
                     Map<String,Serializable> params,
                     Hints hints,
                     ProgressListener listener)
              throws IOException

Create a CoverageStore with the specified name.

You can check isCreateSupported() prior to calling this method. Implementing subclasses may throw an UnsupportedOperationException in case the related Driver won't allow CoverageStore creation.

Parameters:

Name - The name of the data set to create

params - Indicate the content to be created

Hints - Implementations specific Hints, please check the javadocs for your driver for details

Throws:

IllegalStateException - if getSupportedAccessTypes() == READ_ONLY

IOException

isDeleteSupported

boolean isDeleteSupported()

Tells me whether or not this CoverageAccess supports removal of an existing coverage storage.

Returns:

true when removal of an existing coverage storage is supported, false otherwise.

canDelete

boolean canDelete(Name name,
                  Map<String,Serializable> params,
                  Hints hints)
           throws IOException

Test to see if this coverage access is suitable for deleting a CoverageSource referred by Name, with the specified set of parameters.

Parameters:

Name - Name of data set to remove from

Params - Used to indicate what what of the data set to remove; if null indicate the entire data set should be removed

Hints - Implementation specific Hints; please consult the javadocs for the Driver you are working with.

Throws:

IOException

delete

boolean delete(Name name,
               Map<String,Serializable> params,
               Hints hints)
        throws IOException

Asks this CoverageAccess to entirely remove a certain Coverage from the available CoverageSources.

Many file based formats won't allow to perform such operation, but db based source should be quite happy with it.

Parameters:

name -

params -

accessType -

hints -

Returns:

true in case of success.

Throws:

IOException

getConnectParameters

Map<String,Serializable> getConnectParameters()

Retrieves the parameters used to connect to this live instance of CoverageAccess.

Returns:

the parameters used to connect to this live instance of CoverageAccess.

dispose

void dispose()

This will free any cached info object or header information.

Often a CoverageAccess will keep a file channel open, this will clean that sort of thing up.

Once a CoverageAccess has been disposed it can be seen as being in unspecified state, hence calling a method on it may have unpredictable results.

getStorageMetadata

MetadataNode getStorageMetadata(String metadataDomain)

getStorageMetadataDomains

Set<String> getStorageMetadataDomains()