Package dap4.dap4lib.cdm

Class CDMUtil

java.lang.Object

dap4.dap4lib.cdm.CDMUtil

public abstract class CDMUtil
extends Object

CDM related Constants and utilities common to client and server code

Field Summary

Fields

Modifier and Type	Field	Description
static Index	SCALAR

Constructor Summary

Constructors

Constructor	Description
CDMUtil()

Method Summary

Modifier and Type	Method	Description
static Index	cdmIndexToIndex(Index cdmidx)
static int[]	computeEffectiveShape(List<DapDimension> dimset)	Compute the shape inferred from a set of slices.
static boolean	containsVLEN(List<Dimension> dimset)	Test if any dimension is variable length
static Object	convertVector(DapType dsttype, DapType srctype, Object src)	Convert an array of one type of values to another type
static List<Range>	createCDMRanges(List<Slice> slices)
static List<Slice>	createSlices(List<Range> rangelist)	Convert a list of ucar.ma2.Range to a list of Slice More or less the inverst of create CDMRanges
static List<Range>	dimsetToRanges(List<DapDimension> dimset)
static String	getChecksumString(byte[] checksum)
static boolean	hasVLEN(List<Range> ranges)
static boolean	hasVLEN(Variable v)	Test if any dimension is variable length
static Index	indexToCcMIndex(Index d4)
static List<Slice>	indexToSlices(Index indices)	Convert DataIndex to list of slices
static boolean	isWhole(List<Range> rangelist, List<DapDimension> dimset, int start, int stop)	Test a List against a List to see if the range list represents the whole set of dimensions within the specified indices.
static boolean	isWhole(List<Range> rangelist, List<Slice> slices)	Test a List against a List to see if the range list is whole wrt the slices
static boolean	isWhole(List<Range> rangelist, Variable var)	Test a List against the CDM variable's dimensions to see if the range list is whole wrt the dimensions
static List<Slice>	shapeToSlices(int[] shape)
static Index	slicesToIndex(List<Slice> slices)	If a set of slices refers to a single position, then return the corresponding Index.
static Variable	unwrap(Variable var)	NetcdfDataset can end up wrapping a variable in multiple wrapping classes (e.g.
static NetcdfFile	unwrapfile(NetcdfFile file)	NetcdfDataset can wrap a NetcdfFile.

Methods inherited from class java.lang.Object

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

Field Detail

SCALAR

public static final Index SCALAR

Constructor Detail

CDMUtil

public CDMUtil()

Method Detail

createSlices

public static List<Slice> createSlices(List<Range> rangelist)
                                throws DapException

Convert a list of ucar.ma2.Range to a list of Slice More or less the inverst of create CDMRanges

Parameters:

rangelist - the set of ucar.ma2.Range

Returns:

the equivalent list of Slice

Throws:

DapException

isWhole

public static boolean isWhole(List<Range> rangelist,
                              List<DapDimension> dimset,
                              int start,
                              int stop)
                       throws DapException

Test a List against a List to see if the range list represents the whole set of dimensions within the specified indices.

Parameters:

rangelist - the set of ucar.ma2.Range

dimset - the set of DapDimensions

start - start looking here

stop - stop looking here

Returns:

true if rangelist is whole; false otherwise.

Throws:

DapException

isWhole

public static boolean isWhole(List<Range> rangelist,
                              List<Slice> slices)
                       throws DapException

Test a List against a List to see if the range list is whole wrt the slices

Parameters:

rangelist - the set of ucar.ma2.Range

slices - the set of slices

Returns:

true if rangelist is whole wrt slices; false otherwise.

Throws:

DapException

isWhole

public static boolean isWhole(List<Range> rangelist,
                              Variable var)
                       throws DapException

Test a List against the CDM variable's dimensions to see if the range list is whole wrt the dimensions

Parameters:

rangelist - the set of ucar.ma2.Range

var - the cdm var

Returns:

true if rangelist is whole wrt slices; false otherwise.

Throws:

DapException

createCDMRanges

public static List<Range> createCDMRanges(List<Slice> slices)
                                   throws DapException

Throws:

DapException

unwrap

public static Variable unwrap(Variable var)

NetcdfDataset can end up wrapping a variable in multiple wrapping classes (e.g. VariableDS). Goal of this procedure is to get down to the lowest level Variable instance

Parameters:

var - possibly wrapped variable

Returns:

the lowest level Variable instance

unwrapfile

public static NetcdfFile unwrapfile(NetcdfFile file)

NetcdfDataset can wrap a NetcdfFile. Goal of this procedure is to get down to the lowest level NetcdfFile instance.

Parameters:

file - NetcdfFile or NetcdfDataset

Returns:

the lowest level NetcdfFile instance

hasVLEN

public static boolean hasVLEN(List<Range> ranges)

hasVLEN

public static boolean hasVLEN(Variable v)

Test if any dimension is variable length

containsVLEN

public static boolean containsVLEN(List<Dimension> dimset)

Test if any dimension is variable length

computeEffectiveShape

public static int[] computeEffectiveShape(List<DapDimension> dimset)

Compute the shape inferred from a set of slices. 'Effective' means that any trailing vlen will be ignored.

Parameters:

dimset - from which to generate shape

Returns:

effective shape

convertVector

public static Object convertVector(DapType dsttype,
                                   DapType srctype,
                                   Object src)

Convert an array of one type of values to another type

Parameters:

dsttype - target type

srctype - source type

src - array of values to convert

Returns:

resulting array of converted values as an object

getChecksumString

public static String getChecksumString(byte[] checksum)

dimsetToRanges

public static List<Range> dimsetToRanges(List<DapDimension> dimset)
                                  throws DapException

Throws:

DapException

shapeToSlices

public static List<Slice> shapeToSlices(int[] shape)
                                 throws DapException

Throws:

DapException

cdmIndexToIndex

public static Index cdmIndexToIndex(Index cdmidx)

indexToCcMIndex

public static Index indexToCcMIndex(Index d4)

indexToSlices

public static List<Slice> indexToSlices(Index indices)
                                 throws DapException

Convert DataIndex to list of slices

Parameters:

indices - to convert

Returns:

list of corresponding slices

Throws:

DapException

slicesToIndex

public static Index slicesToIndex(List<Slice> slices)
                           throws DapException

If a set of slices refers to a single position, then return the corresponding Index. Otherwise, throw Exception.

Parameters:

slices -

Returns:

Index corresponding to slices

Throws:

DapException