VariableDS (NetCDF-Java CDM Public API v5.4.2)

java.lang.Object
- ucar.nc2.CDMNode
- - ucar.nc2.Variable
  - - ucar.nc2.dataset.VariableDS

All Implemented Interfaces:

Comparable<VariableSimpleIF>, Iterable<Attribute>, IsMissingEvaluator, AttributeContainer, ucar.nc2.dataset.Enhancements, EnhanceScaleMissingUnsigned, VariableEnhanced, ProxyReader, VariableSimpleIF

Direct Known Subclasses:

CoordinateAxis
```
public class VariableDS
extends Variable
implements VariableEnhanced, EnhanceScaleMissingUnsigned
```
A wrapper around a Variable, creating an "enhanced" Variable. The original Variable is used for the I/O. There are several distinct uses:
1. Handle scale/offset/missing/enum/unsigned conversion; this can change DataType and data values
2. Container for coordinate system information
3. NcML modifications to underlying Variable
See Also:

NetcdfDataset

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class VariableDS.Builder<T extends VariableDS.Builder<T>>

Nested Classes
Modifier and Type	Class and Description
`static class`	`VariableDS.Builder<T extends VariableDS.Builder<T>>`

Field Summary
- Fields inherited from class ucar.nc2.Variable
  defaultCoordsSizeToCache, defaultSizeToCache, permitCaching

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Array`	`applyScaleOffset(Array data)` Apply scale and offset to each element of `in` and return the result as a new Array, but only if `EnhanceScaleMissingUnsigned.hasScaleOffset()`.
`double`	`applyScaleOffset(Number value)` Apply scale and offset to the specified value if `EnhanceScaleMissingUnsigned.hasScaleOffset()`.
`static VariableDS.Builder<?>`	`builder()` Get Builder for this class that allows subclassing.
`Array`	`convert(Array in, boolean convertUnsigned, boolean applyScaleOffset, boolean convertMissing)` Perform the specified conversions on each element of `in` and return the result as a new Array.
`Array`	`convertMissing(Array in)` Returns a copy of `in`, except that each `missing` value is replaced by `Double.NaN`.
`Number`	`convertMissing(Number value)` If `value` `is missing`, return `Double.NaN`.
`Array`	`convertUnsigned(Array in)` Performs an `unsigned conversion` of each element of `in` and returns the result as a new Array.
`Number`	`convertUnsigned(Number value)` Convert `value` to the next largest integral data type by an `unsigned conversion`.
`com.google.common.collect.ImmutableList<CoordinateSystem>`	`getCoordinateSystems()` Get the list of Coordinate Systems for this Variable.
`String`	`getDatasetLocation()` The location of the dataset this belongs to.
`String`	`getDescription()` Get the description of the Variable.
`Set<NetcdfDataset.Enhance>`	`getEnhanceMode()` Returns the enhancements applied to this variable.
`double`	`getFillValue()` return value of _FillValue attribute
`Array`	`getMissingDataArray(int[] shape)` Return Array with missing data
`double[]`	`getMissingValues()` return values of missing_value attributes
`NetcdfFile`	`getNetcdfFile()` Get the NetcdfFile that this variable is contained in.
`double`	`getOffset()` The number to be added to the data after it is read.
`DataType`	`getOriginalDataType()` When this wraps another Variable, get the original Variable's DataType.
`String`	`getOriginalName()` When this wraps another Variable, get the original Variable's name.
`Variable`	`getOriginalVariable()` A VariableDS usually wraps another Variable.
`DataType`	`getScaledOffsetType()` Return the data type for values that have undergone scale/offset conversion.
`double`	`getScaleFactor()` The data are to be multiplied by this value after the data are read.
`DataType.Signedness`	`getSignedness()` Returns the signedness of the decorated variable.
`String`	`getUnitsString()` Get the Unit String for the Variable.
`DataType`	`getUnsignedConversionType()` Return the data type for values that have undergone unsigned conversion.
`double`	`getValidMax()` return the maximum value in the valid range
`double`	`getValidMin()` return the minimum value in the valid range
`boolean`	`hasFillValue()` true if Variable has _FillValue attribute
`boolean`	`hasMissing()` true if Variable has missing data values
`boolean`	`hasMissingValue()` true if Variable has missing_value attribute
`boolean`	`hasScaleOffset()` true if Variable data will be converted using scale and offset
`boolean`	`hasValidData()` true if Variable has valid_range, valid_min or valid_max attributes
`boolean`	`isFillValue(double val)` return true if val equals the _FillValue
`boolean`	`isInvalidData(double val)` return true if val is outside the valid range
`boolean`	`isMissing(double val)` Returns `true` if the argument is a missing value.
`boolean`	`isMissingValue(double val)` return true if val equals a missing_value (low-level)
`String`	`lookupEnumString(int val)` Lookup the enum string for this value.
`long`	`readToStream(Section section, OutputStream out)` Read variable data to a stream.
`Array`	`reallyRead(Variable client, CancelTask cancelTask)` public by accident, do not call directly.
`Array`	`reallyRead(Variable client, Section section, CancelTask cancelTask)` public by accident, do not call directly.
`void`	`showScaleMissingProxy(Formatter f)` public for debugging
`VariableDS.Builder<?>`	`toBuilder()` Turn into a mutable Builder.
`String`	`toStringDebug()` String representation of Variable and its attributes.

Methods inherited from class ucar.nc2.CDMNode
getShortName

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface ucar.nc2.dataset.VariableEnhanced
getFullName, getShortName

Methods inherited from interface ucar.nc2.dataset.Enhancements
addCoordinateSystem, removeCoordinateSystem

Methods inherited from interface ucar.nc2.VariableSimpleIF
getShortName

Methods inherited from interface ucar.nc2.AttributeContainer
filter, findAttributeDouble, findAttributeIgnoreCase, findAttributeInteger, getName, hasAttribute, hasAttributeIgnoreCase, isEmpty, iterator

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Method Detail
  - applyScaleOffset
```
public Array applyScaleOffset(Array data)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Apply scale and offset to each element of in and return the result as a new Array, but only if EnhanceScaleMissingUnsigned.hasScaleOffset(). Otherwise, just return value. Otherwise, just return data.
    
    Specified by:
    
    applyScaleOffset in interface EnhanceScaleMissingUnsigned
    
    Parameters:
    
    data - convert this
    
    Returns:
    
    converted data.
  - applyScaleOffset
```
public double applyScaleOffset(Number value)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Apply scale and offset to the specified value if EnhanceScaleMissingUnsigned.hasScaleOffset(). Otherwise, just return value.
    
    Specified by:
    
    applyScaleOffset in interface EnhanceScaleMissingUnsigned
  - builder
```
public static VariableDS.Builder<?> builder()
```
    Get Builder for this class that allows subclassing.
    
    See Also:
    
    "https://community.oracle.com/blogs/emcmanus/2010/10/24/using-builder-pattern-subclasses"
  - convert
```
public Array convert(Array in,
                     boolean convertUnsigned,
                     boolean applyScaleOffset,
                     boolean convertMissing)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Perform the specified conversions on each element of in and return the result as a new Array. Note that this method is more efficient than calling EnhanceScaleMissingUnsigned.convertUnsigned(Array), followed by EnhanceScaleMissingUnsigned.applyScaleOffset(Array), followed by EnhanceScaleMissingUnsigned.convertMissing(Array), as only one copy of in is made.
    
    Specified by:
    
    convert in interface EnhanceScaleMissingUnsigned
    
    Parameters:
    
    in - a numeric array.
    
    convertUnsigned - true if we should convert unsigned.
    
    applyScaleOffset - true if we should apply scale/offset.
    
    convertMissing - true if we should convert missing.
    
    Returns:
    
    a new array, with the specified conversions performed.
  - convertMissing
```
public Array convertMissing(Array in)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Returns a copy of in, except that each missing value is replaced by Double.NaN.
    
    Specified by:
    
    convertMissing in interface EnhanceScaleMissingUnsigned
    
    Parameters:
    
    in - an array containing floating-point numbers to convert.
    
    Returns:
    
    the result of a missing conversion of each element of in.
  - convertMissing
```
public Number convertMissing(Number value)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    If value is missing, return Double.NaN. Otherwise, simply return value
    
    Specified by:
    
    convertMissing in interface EnhanceScaleMissingUnsigned
  - convertUnsigned
```
public Array convertUnsigned(Array in)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Performs an unsigned conversion of each element of in and returns the result as a new Array. The data type of the returned array will be EnhanceScaleMissingUnsigned.getUnsignedConversionType().
    
    Specified by:
    
    convertUnsigned in interface EnhanceScaleMissingUnsigned
    
    Parameters:
    
    in - an Array containing integral Numbers to convert.
    
    Returns:
    
    the result of an unsigned conversion of each element of in.
  - convertUnsigned
```
public Number convertUnsigned(Number value)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Convert value to the next largest integral data type by an unsigned conversion. The conversion only happens if the decorated variable is unsigned and value is a negative integer. Otherwise, simply return value.
    
    Specified by:
    
    convertUnsigned in interface EnhanceScaleMissingUnsigned
    
    Parameters:
    
    value - an integral number to convert.
    
    Returns:
    
    the result of an unsigned conversion of value.
  - getCoordinateSystems
```
public com.google.common.collect.ImmutableList<CoordinateSystem> getCoordinateSystems()
```
    Description copied from interface: Enhancements
    
    Get the list of Coordinate Systems for this Variable.
    
    Specified by:
    
    getCoordinateSystems in interface ucar.nc2.dataset.Enhancements
    
    Returns:
    
    list of type CoordinateSystem; may be empty but not null.
  - getDatasetLocation
```
public String getDatasetLocation()
```
    Description copied from class: Variable
    
    The location of the dataset this belongs to. Labeling purposes only.
    
    Overrides:
    
    getDatasetLocation in class Variable
  - getDescription
```
public String getDescription()
```
    Description copied from class: Variable
    
    Get the description of the Variable. Default is to use CDM.LONG_NAME attribute value. If not exist, look for "description", "title", or "standard_name" attribute value (in that order).
    
    Specified by:
    
    getDescription in interface ucar.nc2.dataset.Enhancements
    
    Specified by:
    
    getDescription in interface VariableSimpleIF
    
    Overrides:
    
    getDescription in class Variable
    
    Returns:
    
    description, or null if not found.
  - getEnhanceMode
```
public Set<NetcdfDataset.Enhance> getEnhanceMode()
```
    Returns the enhancements applied to this variable. If this variable wraps another variable, the returned set will also contain the enhancements applied to the nested variable, recursively.
    
    Returns:
    
    the enhancements applied to this variable.
  - getFillValue
```
public double getFillValue()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    return value of _FillValue attribute
    
    Specified by:
    
    getFillValue in interface EnhanceScaleMissingUnsigned
  - getMissingDataArray
```
public Array getMissingDataArray(int[] shape)
```
    Return Array with missing data
    
    Parameters:
    
    shape - of this shape
    
    Returns:
    
    Array with given shape
  - getMissingValues
```
public double[] getMissingValues()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    return values of missing_value attributes
    
    Specified by:
    
    getMissingValues in interface EnhanceScaleMissingUnsigned
  - getNetcdfFile
```
public NetcdfFile getNetcdfFile()
```
    Description copied from class: Variable
    
    Get the NetcdfFile that this variable is contained in. May be null.
    
    Overrides:
    
    getNetcdfFile in class Variable
  - getOffset
```
public double getOffset()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    The number to be added to the data after it is read. If both CDM.SCALE_FACTOR and CDM.ADD_OFFSET attributes are present, the data are first scaled before the offset is added. By default it is 0.0, i.e. no offset. It will remain that value if the variable defines no CDM.SCALE_FACTOR attribute.
    
    Specified by:
    
    getOffset in interface EnhanceScaleMissingUnsigned
    
    Returns:
    
    the number to add to the data.
  - getOriginalDataType
```
public DataType getOriginalDataType()
```
    When this wraps another Variable, get the original Variable's DataType.
    
    Returns:
    
    original Variable's DataType, or current data type if it doesnt wrap another variable
  - getOriginalName
```
public String getOriginalName()
```
    When this wraps another Variable, get the original Variable's name.
    
    Specified by:
    
    getOriginalName in interface VariableEnhanced
    
    Returns:
    
    original Variable's name
  - getOriginalVariable
```
public Variable getOriginalVariable()
```
    A VariableDS usually wraps another Variable.
    
    Specified by:
    
    getOriginalVariable in interface VariableEnhanced
    
    Returns:
    
    original Variable or null
  - getScaledOffsetType
```
@Nullable
public DataType getScaledOffsetType()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Return the data type for values that have undergone scale/offset conversion. This will be null if the decorated variable lacks scale_factor or add_offset attributes. You can check with EnhanceScaleMissingUnsigned.hasScaleOffset().
    
    Specified by:
    
    getScaledOffsetType in interface EnhanceScaleMissingUnsigned
    
    Returns:
    
    the data type for values that have undergone scale/offset conversion.
  - getScaleFactor
```
public double getScaleFactor()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    The data are to be multiplied by this value after the data are read. By default it is 1.0, i.e. no scaling. It will remain that value if the variable defines no CDM.SCALE_FACTOR attribute.
    
    Specified by:
    
    getScaleFactor in interface EnhanceScaleMissingUnsigned
    
    Returns:
    
    the multiplier to apply to the data.
  - getSignedness
```
public DataType.Signedness getSignedness()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Returns the signedness of the decorated variable.
    
    Specified by:
    
    getSignedness in interface EnhanceScaleMissingUnsigned
    
    Returns:
    
    the signedness of the decorated variable.
  - getUnitsString
```
public String getUnitsString()
```
    Description copied from class: Variable
    
    Get the Unit String for the Variable. Looks for the CDM.UNITS attribute value
    
    Specified by:
    
    getUnitsString in interface ucar.nc2.dataset.Enhancements
    
    Specified by:
    
    getUnitsString in interface VariableSimpleIF
    
    Overrides:
    
    getUnitsString in class Variable
    
    Returns:
    
    unit string, or null if not found.
  - getUnsignedConversionType
```
public DataType getUnsignedConversionType()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Return the data type for values that have undergone unsigned conversion. This will never be null, even when no unsigned conversion is necessary (because the underlying variable isn't unsigned). In such cases, this data type will be the same as that of the underlying variable.
    
    Specified by:
    
    getUnsignedConversionType in interface EnhanceScaleMissingUnsigned
    
    Returns:
    
    the data type for values that have undergone unsigned conversion.
  - getValidMax
```
public double getValidMax()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    return the maximum value in the valid range
    
    Specified by:
    
    getValidMax in interface EnhanceScaleMissingUnsigned
  - getValidMin
```
public double getValidMin()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    return the minimum value in the valid range
    
    Specified by:
    
    getValidMin in interface EnhanceScaleMissingUnsigned
  - hasFillValue
```
public boolean hasFillValue()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    true if Variable has _FillValue attribute
    
    Specified by:
    
    hasFillValue in interface EnhanceScaleMissingUnsigned
  - hasMissing
```
public boolean hasMissing()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    true if Variable has missing data values
    
    Specified by:
    
    hasMissing in interface IsMissingEvaluator
    
    Specified by:
    
    hasMissing in interface EnhanceScaleMissingUnsigned
    
    Returns:
    
    true if Variable has missing data values
  - hasMissingValue
```
public boolean hasMissingValue()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    true if Variable has missing_value attribute
    
    Specified by:
    
    hasMissingValue in interface EnhanceScaleMissingUnsigned
  - hasScaleOffset
```
public boolean hasScaleOffset()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    true if Variable data will be converted using scale and offset
    
    Specified by:
    
    hasScaleOffset in interface EnhanceScaleMissingUnsigned
  - hasValidData
```
public boolean hasValidData()
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    true if Variable has valid_range, valid_min or valid_max attributes
    
    Specified by:
    
    hasValidData in interface EnhanceScaleMissingUnsigned
  - isFillValue
```
public boolean isFillValue(double val)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    return true if val equals the _FillValue
    
    Specified by:
    
    isFillValue in interface EnhanceScaleMissingUnsigned
  - isInvalidData
```
public boolean isInvalidData(double val)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    return true if val is outside the valid range
    
    Specified by:
    
    isInvalidData in interface EnhanceScaleMissingUnsigned
  - isMissing
```
public boolean isMissing(double val)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    Returns true if the argument is a missing value. Note that Float.NaN and Double.NaN are considered missing data.
    
    Specified by:
    
    isMissing in interface IsMissingEvaluator
    
    Specified by:
    
    isMissing in interface EnhanceScaleMissingUnsigned
    
    Parameters:
    
    val - an unpacked value.
    
    Returns:
    
    true if the argument is a missing value.
  - isMissingValue
```
public boolean isMissingValue(double val)
```
    Description copied from interface: EnhanceScaleMissingUnsigned
    
    return true if val equals a missing_value (low-level)
    
    Specified by:
    
    isMissingValue in interface EnhanceScaleMissingUnsigned
  - lookupEnumString
```
public String lookupEnumString(int val)
```
    Description copied from class: Variable
    
    Lookup the enum string for this value. Can only be called on enum types, where dataType.isEnum() is true.
    
    Overrides:
    
    lookupEnumString in class Variable
    
    Parameters:
    
    val - the integer value of this enum
    
    Returns:
    
    the String value
  - readToStream
```
public long readToStream(Section section,
                         OutputStream out)
                  throws IOException,
                         InvalidRangeException
```
    Description copied from class: Variable
    
    Read variable data to a stream. Support for NcStreamWriter.
    
    Overrides:
    
    readToStream in class Variable
    
    Throws:
    
    IOException
    
    InvalidRangeException
  - reallyRead
```
public Array reallyRead(Variable client,
                        CancelTask cancelTask)
                 throws IOException
```
    Description copied from class: Variable
    
    public by accident, do not call directly.
    
    Specified by:
    
    reallyRead in interface ProxyReader
    
    Overrides:
    
    reallyRead in class Variable
    
    Parameters:
    
    client - the client Variable
    
    cancelTask - user may cancel
    
    Returns:
    
    Array
    
    Throws:
    
    IOException - on error
  - reallyRead
```
public Array reallyRead(Variable client,
                        Section section,
                        CancelTask cancelTask)
                 throws IOException,
                        InvalidRangeException
```
    Description copied from class: Variable
    
    public by accident, do not call directly.
    
    Specified by:
    
    reallyRead in interface ProxyReader
    
    Overrides:
    
    reallyRead in class Variable
    
    Parameters:
    
    client - the client Variable
    
    section - the section of data to read.
    
    cancelTask - user may cancel
    
    Returns:
    
    Array
    
    Throws:
    
    IOException - on error
    
    InvalidRangeException - if section has incorrect rank or illegal shape.
  - showScaleMissingProxy
```
public void showScaleMissingProxy(Formatter f)
```
    public for debugging
    
    Parameters:
    
    f - put info here
  - toBuilder
```
public VariableDS.Builder<?> toBuilder()
```
    Description copied from class: Variable
    
    Turn into a mutable Builder. Can use toBuilder().build() to copy.
    
    Overrides:
    
    toBuilder in class Variable
  - toStringDebug
```
public String toStringDebug()
```
    Description copied from class: Variable
    
    String representation of Variable and its attributes.
    
    Overrides:
    
    toStringDebug in class Variable

Class VariableDS

Nested Class Summary

Field Summary

Fields inherited from class ucar.nc2.Variable

Method Summary

Methods inherited from class ucar.nc2.Variable

Methods inherited from class ucar.nc2.CDMNode

Methods inherited from class java.lang.Object

Methods inherited from interface ucar.nc2.dataset.VariableEnhanced

Methods inherited from interface ucar.nc2.dataset.Enhancements

Methods inherited from interface ucar.nc2.VariableSimpleIF

Methods inherited from interface ucar.nc2.AttributeContainer

Methods inherited from interface java.lang.Iterable

Method Detail

applyScaleOffset

applyScaleOffset

builder

convert

convertMissing

convertMissing

convertUnsigned

convertUnsigned

getCoordinateSystems

getDatasetLocation

getDescription

getEnhanceMode

getFillValue

getMissingDataArray

getMissingValues

getNetcdfFile

getOffset

getOriginalDataType

getOriginalName

getOriginalVariable

getScaledOffsetType

getScaleFactor

getSignedness

getUnitsString

getUnsignedConversionType

getValidMax

getValidMin

hasFillValue

hasMissing

hasMissingValue

hasScaleOffset

hasValidData

isFillValue

isInvalidData

isMissing

isMissingValue

lookupEnumString

readToStream

reallyRead

reallyRead

showScaleMissingProxy

toBuilder

toStringDebug