org.deegree.model.coverage.grid
Class AbstractGridCoverageReader

java.lang.Object
  org.deegree.model.coverage.grid.AbstractGridCoverageReader

All Implemented Interfaces:

GridCoverageReader

Direct Known Subclasses:

CompoundGridCoverageReader, GeoTIFFGridCoverageReader, ImageGridCoverageReader, OracleGeoRasterGridCoverageReader, RawDataReader

public abstract class AbstractGridCoverageReader
extends Object
implements GridCoverageReader

Version:

$Revision: 18195 $, $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Thu, 18 Jun 2009) $

Author:

Andreas Poth, last edited by: $Author: mschneider $

Field Summary

protected CoverageOffering	description
protected Envelope	envelope
protected Format	format
protected Object	source

Constructor Summary

AbstractGridCoverageReader(Object source, CoverageOffering description, Envelope envelope, Format format)

Method Summary

protected LonLatEnvelope	calcLonLatEnvelope(Envelope env, String sourceCRS) transforms the passed Envelope to a LonLatEnvelope If the passed source CRS isn't equal to "EPSG:4326" the Envelope will be transformed to "EPSG:4326" first.
String	getCurrentSubname() Returns the name for the next grid coverage to be read from the input source.
Format	getFormat() Returns the format handled by this GridCoverageReader.
String[]	getMetadataNames() Returns the list of metadata keywords associated with the input source as a whole (not associated with any particular grid coverage).
String	getMetadataValue(String name) Retrieve the metadata value for a given metadata name.
Object	getSource() Returns the input source.
String[]	listSubNames() Retrieve the list of grid coverages contained within the input source.
void	setCurrentSubname(String name) Set the name for the next grid coverage to GridCoverageWriter#write within theinput.
void	setMetadataValue(String name, String value) Sets the metadata value for a given metadata name.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.deegree.model.coverage.grid.GridCoverageReader

dispose, read

Field Detail

description

protected CoverageOffering description

source

protected Object source

envelope

protected Envelope envelope

format

protected Format format

Constructor Detail

AbstractGridCoverageReader

public AbstractGridCoverageReader(Object source,
                                  CoverageOffering description,
                                  Envelope envelope,
                                  Format format)

Parameters:

source -

description -

envelope -

format -

Method Detail

getSource

public Object getSource()

Returns the input source. This is the object passed to the "org.opengis.coverage.grid.GridCoverageExchange#getReader(Object)" method. It can be a String, an InputStream, a FileChannel, whatever.

Specified by:

getSource in interface GridCoverageReader

Returns:

the input source.

getMetadataNames

public String[] getMetadataNames()
                          throws IOException

Returns the list of metadata keywords associated with the input source as a whole (not associated with any particular grid coverage). If no metadata is available, the array will be empty.

Specified by:

getMetadataNames in interface GridCoverageReader

Returns:

The list of metadata keywords for the input source.

Throws:

IOException - if an error occurs during reading.

revisit

This javadoc may not apply thats well in the iterator scheme.

getMetadataValue

public String getMetadataValue(String name)
                        throws IOException,
                               MetadataNameNotFoundException

Retrieve the metadata value for a given metadata name.

Specified by:

getMetadataValue in interface GridCoverageReader

Parameters:

name - Metadata keyword for which to retrieve metadata.

Returns:

The metadata value for the given metadata name. Should be one of the name returned by getMetadataNames().

Throws:

IOException - if an error occurs during reading.

MetadataNameNotFoundException - if there is no value for the specified metadata name.

revisit

This javadoc may not apply thats well in the iterator scheme.

setMetadataValue

public void setMetadataValue(String name,
                             String value)
                      throws IOException,
                             MetadataNameNotFoundException

Sets the metadata value for a given metadata name.

Specified by:

setMetadataValue in interface GridCoverageReader

Parameters:

name - Metadata keyword for which to set the metadata.

value - The metadata value for the given metadata name.

Throws:

IOException - if an error occurs during writing.

MetadataNameNotFoundException - if the specified metadata name is not handled for this format.

revisit

This javadoc may not apply thats well in the iterator scheme.

setCurrentSubname

public void setCurrentSubname(String name)
                       throws IOException

Set the name for the next grid coverage to GridCoverageWriter#write within theinput. The subname can been fetch later at reading time.

Specified by:

setCurrentSubname in interface GridCoverageReader

Parameters:

name -

Throws:

IOException - if an error occurs during writing.

revisit

Do we need a special method for that, or should it be a metadata?

listSubNames

public String[] listSubNames()
                      throws IOException

Retrieve the list of grid coverages contained within the input source. Each grid can have a different coordinate system, number of dimensions and grid geometry. For example, a HDF-EOS file (GRID.HDF) contains 6 grid coverages each having a different projection. An empty array will be returned if no sub names exist.

Specified by:

listSubNames in interface GridCoverageReader

Returns:

The list of grid coverages contained within the input source.

Throws:

IOException - if an error occurs during reading.

revisit

The javadoc should also be more explicit about hierarchical format. Should the names be returned as paths? Explain what to return if the GridCoverage are accessible by index only. A proposal is to name them "grid1", "grid2", etc.

getCurrentSubname

public String getCurrentSubname()
                         throws IOException

Returns the name for the next grid coverage to be read from the input source.

Specified by:

getCurrentSubname in interface GridCoverageReader

Returns:

the name for the next grid coverage to be read from the input source.

Throws:

IOException - if an error occurs during reading.

revisit

Do we need a special method for that, or should it be a metadata?

getFormat

public Format getFormat()

Returns the format handled by this GridCoverageReader.

Specified by:

getFormat in interface GridCoverageReader

Returns:

the format handled by this GridCoverageReader.

calcLonLatEnvelope

protected LonLatEnvelope calcLonLatEnvelope(Envelope env,
                                            String sourceCRS)

transforms the passed Envelope to a LonLatEnvelope If the passed source CRS isn't equal to "EPSG:4326" the Envelope will be transformed to "EPSG:4326" first.

Parameters:

env -

sourceCRS -

Returns:

LatLonEnvelope in "EPSG:4326"