visad.data.dods
Class DODSForm

java.lang.Object
  visad.data.FormNode
      visad.data.Form
          visad.data.dods.DODSForm

All Implemented Interfaces:

FormFileInformer

public class DODSForm
extends Form
implements FormFileInformer

Provides support for accessing the DODS form of data from VisAD.

Instances are mutable.

Author:

Steven R. Emmerson

Field Summary

static String

SUFFIX The suffix in the path-component of a URL specification that identifies a dataset specification as being a DODS dataset specification.

Fields inherited from class visad.data.Form

mathType

Constructor Summary

protected

DODSForm() Constructs from nothing.

Method Summary

void	add(String id, Data data, boolean replace) Throws an exception.
static DODSForm	dodsForm() Returns an instance of this class.
String[]	getDefaultSuffixes() Returns the path-component suffixes that identifies a dataset specification as being a DODS dataset specification.
FormNode	getForms(Data data) Returns null.
boolean	isThisType(byte[] block) Does nothing.
boolean	isThisType(String spec) Indicates if a dataset specification is consistent with a DODS dataset specification.
DataImpl	open(String id) Opens an existing DODS dataset.
DataImpl	open(URL url) Opens an existing data object.
void	save(String id, Data data, boolean replace) Throws an exception.

Methods inherited from class visad.data.Form

getMathType

Methods inherited from class visad.data.FormNode

getName

Methods inherited from class java.lang.Object

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

Field Detail

SUFFIX

public static final String SUFFIX

The suffix in the path-component of a URL specification that identifies a dataset specification as being a DODS dataset specification. It doesn't have a leading period.

See Also:

Constant Field Values

Constructor Detail

DODSForm

protected DODSForm()

Constructs from nothing.

Method Detail

dodsForm

public static DODSForm dodsForm()

Returns an instance of this class.

Returns:

An instance of this class.

save

public void save(String id,
                 Data data,
                 boolean replace)
          throws BadFormException,
                 IOException,
                 RemoteException,
                 VisADException

Throws an exception.

Specified by:

save in class FormNode

Parameters:

id - An identifier.

data - A VisAD data object.

replace - Whether or not to replace an existing object.

Throws:

UnimplementedException - Always.

BadFormException

IOException

RemoteException

VisADException

add

public void add(String id,
                Data data,
                boolean replace)
         throws BadFormException

Throws an exception.

Specified by:

add in class FormNode

Parameters:

id - An identifier.

data - A VisAD data object.

replace - Whether or not to replace an existing object.

Throws:

BadFormException - Always.

open

public DataImpl open(String id)
              throws BadFormException,
                     IOException,
                     VisADException

Opens an existing DODS dataset.

Specified by:

open in class FormNode

Parameters:

id - The URL for a DODS dataset. The path component should have a SUFFIX suffix.

Returns:

The VisAD data object corresponding to the specified DODS dataset. Might be null.

Throws:

BadFormException - The DODS dataset is corrupt.

VisADException - VisAD failure.

RemoteException - Java RMI failure.

IOException

open

public DataImpl open(URL url)
              throws BadFormException,
                     VisADException,
                     IOException

Opens an existing data object.

Specified by:

open in class FormNode

Parameters:

url - The URL for a DODS dataset. The path component should have a SUFFIX suffix.

Returns:

The VisAD data object corresponding to the DODS dataset.

Throws:

BadFormException - The DODS dataset is corrupt.

VisADException - VisAD failure.

RemoteException - Java RMI failure.

IOException

getForms

public FormNode getForms(Data data)

Returns null.

Specified by:

getForms in class FormNode

Parameters:

data - A VisAD data object.

Returns:

null.

isThisType

public boolean isThisType(String spec)

Indicates if a dataset specification is consistent with a DODS dataset specification.

Specified by:

isThisType in interface FormFileInformer

Parameters:

spec - A dataset specification. NB: Not a URL.

Returns:

true if and only if the dataset specification is consistent with a DODS dataset specification.

isThisType

public boolean isThisType(byte[] block)

Does nothing. Because the initial block of data in a DODS dataset can't be obtained from a DODS server, this routine does nothing and always returns false.

Specified by:

isThisType in interface FormFileInformer

Parameters:

block - A block of data.

Returns:

false always.

getDefaultSuffixes

public String[] getDefaultSuffixes()

Returns the path-component suffixes that identifies a dataset specification as being a DODS dataset specification. The suffixes don't have a leading period. The returned array can be safely modified.

Specified by:

getDefaultSuffixes in interface FormFileInformer

Returns:

A freshly-allocated array with the relevant suffixes.