org.das2.qds

Class LeafTrimDataSet

java.lang.Object

org.das2.qds.AbstractDataSet

org.das2.qds.LeafTrimDataSet

All Implemented Interfaces:

MutablePropertyDataSet, QDataSet

public class LeafTrimDataSet
extends AbstractDataSet

pull out a subset of the dataset by reducing the number of columns in the last dimension. This does not reduce rank. This assumes the dataset has no row with length>end.

Field Summary

Fields inherited from class org.das2.qds.AbstractDataSet

properties

Fields inherited from interface org.das2.qds.QDataSet

AVERAGE_TYPE, BIN_MAX, BIN_MAX_NAME, BIN_MIN, BIN_MIN_NAME, BIN_MINUS, BIN_MINUS_NAME, BIN_PLUS, BIN_PLUS_NAME, BINS_0, BINS_1, BUNDLE_0, BUNDLE_1, BUNDLE_2, BUNDLE_3, CACHE_TAG, CADENCE, CONTEXT_0, CONTEXT_1, COORDINATE_FRAME, DEFAULT_FILL_VALUE, DELTA_MINUS, DELTA_MINUS_NAME, DELTA_PLUS, DELTA_PLUS_NAME, DEPEND_0, DEPEND_1, DEPEND_2, DEPEND_3, DEPENDNAME_0, DEPENDNAME_1, DESCRIPTION, ELEMENT_DIMENSIONS, ELEMENT_LABEL, ELEMENT_NAME, FILL_VALUE, FORMAT, JOIN_0, LABEL, LIMIT_HUGE_DATASET, MAX_HIGH_RANK, MAX_PLANE_COUNT, MAX_RANK, MAX_UNIT_BUNDLE_COUNT, METADATA, METADATA_MODEL, MIN_WAVEFORM_LENGTH, MONOTONIC, NAME, NOTES, PLANE_0, QUBE, RENDER_TYPE, SCALE_TYPE, SOURCE, START_INDEX, TITLE, TYPICAL_MAX, TYPICAL_MIN, UNITS, USER_PROPERTIES, VALID_MAX, VALID_MIN, VALUE_AVERAGE_TYPE_GEOMETRIC, VALUE_AVERAGE_TYPE_LINEAR, VALUE_AVERAGE_TYPE_MOD24, VALUE_AVERAGE_TYPE_MOD360, VALUE_AVERAGE_TYPE_MODPI, VALUE_AVERAGE_TYPE_MODTAU, VALUE_AVERAGE_TYPE_NONE, VALUE_BINS_MIN_MAX, VALUE_BINS_MIN_MAX_INCLUSIVE, VALUE_COORDINATE_FRAME_COMPLEX_NUMBER, VALUE_METADATA_MODEL_ISTP, VALUE_METADATA_MODEL_SPASE, VALUE_RENDER_TYPE_COMPOSITE_IMAGE, VALUE_RENDER_TYPE_DIGITAL, VALUE_RENDER_TYPE_EVENTS_BAR, VALUE_RENDER_TYPE_NNSPECTROGRAM, VALUE_RENDER_TYPE_SERIES, VALUE_RENDER_TYPE_TRIANGLE_MESH, VALUE_SCALE_TYPE_LINEAR, VALUE_SCALE_TYPE_LOG, VERSION, WEIGHTS

Constructor Summary

Constructors

Constructor and Description
LeafTrimDataSet(QDataSet source, int start, int end)

Method Summary

Modifier and Type	Method and Description
int	length() return the length of the first dimension
int	length(int i) return the length of the second dimension, for the ith element of the first dimension.
int	length(int i, int j) return the length of the third dimension, for the ith element of the first dimension and jth element of the second dimension.
int	length(int i0, int i1, int i2) return the length of the fourth dimension for the ith, jth and kth elements of the first three dimensions.
java.lang.Object	property(java.lang.String name) accessor for properties attached to the dataset.
java.lang.Object	property(java.lang.String name, int i) accessor for properties attached to the dataset's first index.
int	rank() returns the rank of the dataset, which is the number of indeces used to access data.
QDataSet	slice(int i) return a dataset that is a slice of this dataset, slicing on the zeroth dimension.
QDataSet	trim(int start, int end) return a dataset that is a subset of this dataset.
double	value(int i) rank 1 accessor.
double	value(int i0, int i1) rank 2 accessor.
double	value(int i0, int i1, int i2) rank 3 accessor.
double	value(int i0, int i1, int i2, int i3) rank 4 accessor.

Methods inherited from class org.das2.qds.AbstractDataSet

capability, checkImmutable, isImmutable, makeImmutable, putProperty, putProperty, svalue, toString, value

Methods inherited from class java.lang.Object

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

Constructor Detail

LeafTrimDataSet

public LeafTrimDataSet(QDataSet source,
                       int start,
                       int end)

Parameters:

source - the rank 1 or greater dataset to back this dataset.

start - first index to include.

end - last index, exclusive

Method Detail

rank

public int rank()

Description copied from interface: QDataSet

returns the rank of the dataset, which is the number of indeces used to access data. Only rank 0, 1, 2, 3, and 4 datasets are supported in the interface. When a dataset's rank is 5 or greater, it should implement the HighRankDataSet interface which affords a slice operation to reduce rank.

Specified by:

rank in interface QDataSet

Specified by:

rank in class AbstractDataSet

Returns:

the rank, or number of indeces used to access data.

value

public double value(int i)

Description copied from interface: QDataSet

rank 1 accessor.

Specified by:

value in interface QDataSet

Overrides:

value in class AbstractDataSet

Parameters:

i - the index

Returns:

the value, see the property UNITS to interpret this.

value

public double value(int i0,
                    int i1)

Description copied from interface: QDataSet

rank 2 accessor.

Specified by:

value in interface QDataSet

Overrides:

value in class AbstractDataSet

Parameters:

i0 - the index

i1 - the index

Returns:

the value, see the property UNITS to interpret this.

value

public double value(int i0,
                    int i1,
                    int i2)

Description copied from interface: QDataSet

rank 3 accessor.

Specified by:

value in interface QDataSet

Overrides:

value in class AbstractDataSet

Parameters:

i0 - the index

i1 - the index

i2 - the index

Returns:

the value, see the property UNITS to interpret this.

value

public double value(int i0,
                    int i1,
                    int i2,
                    int i3)

Description copied from interface: QDataSet

rank 4 accessor.

Specified by:

value in interface QDataSet

Overrides:

value in class AbstractDataSet

Parameters:

i0 - the index

i1 - the index

i2 - the index

i3 - the index

Returns:

the value, see the property UNITS to interpret this.

property

public java.lang.Object property(java.lang.String name)

Description copied from interface: QDataSet

accessor for properties attached to the dataset. See final static members for example properties.

Specified by:

property in interface QDataSet

Overrides:

property in class AbstractDataSet

Parameters:

name - property name, such as "DEPEND_0" or "UNITS"

Returns:

the value

See Also:

QDataSet.DEPEND_0, QDataSet.UNITS

property

public java.lang.Object property(java.lang.String name,
                                 int i)

Description copied from interface: QDataSet

accessor for properties attached to the dataset's first index. These properties override (or shadow) properties attached to the dataset, and often implementations will simply return the result of the no-index accessor. Note: properties of higher dimension are accessible only by slicing.

Specified by:

property in interface QDataSet

Overrides:

property in class AbstractDataSet

Parameters:

name - property name, such as "DEPEND_0" or "UNITS"

i - the index

Returns:

the value

See Also:

QDataSet.DEPEND_0, QDataSet.UNITS

length

public int length()

Description copied from interface: QDataSet

return the length of the first dimension

Specified by:

length in interface QDataSet

Overrides:

length in class AbstractDataSet

Returns:

the length of the first dimension

length

public int length(int i)

Description copied from interface: QDataSet

return the length of the second dimension, for the ith element of the first dimension. Note if there are zero elements in the first dimension, but this is a QUBE, then this should not throw an IndexOutOfBoundsException.

Specified by:

length in interface QDataSet

Overrides:

length in class AbstractDataSet

Parameters:

i - the index

Returns:

the length of the second dimension at index i.

length

public int length(int i,
                  int j)

Description copied from interface: QDataSet

return the length of the third dimension, for the ith element of the first dimension and jth element of the second dimension.

Specified by:

length in interface QDataSet

Overrides:

length in class AbstractDataSet

Parameters:

i - the index

j - the index

Returns:

the length of the third dimension at index i.

length

public int length(int i0,
                  int i1,
                  int i2)

Description copied from interface: QDataSet

return the length of the fourth dimension for the ith, jth and kth elements of the first three dimensions.

Specified by:

length in interface QDataSet

Overrides:

length in class AbstractDataSet

Parameters:

i0 - the index

i1 - the index

i2 - the index

Returns:

the length of the fourth dimension for the ith, jth and kth elements of the first three dimensions.

slice

public QDataSet slice(int i)

return a dataset that is a slice of this dataset, slicing on the zeroth dimension. A slice will be the elements at this index, for example if this dataset is a rank 2 dataset flux(Time,Energy) then the slice of this will be a rank 1 dataset flux(Energy). The result of any slice will be a qube. Note the index must be positive. Negative indices, referenced from the end of the dataset, are not supported. This must also copy the dimension properties explicitly.

Specified by:

slice in interface QDataSet

Overrides:

slice in class AbstractDataSet

Parameters:

i -

Returns:

trim

public QDataSet trim(int start,
                     int end)

Description copied from interface: QDataSet

return a dataset that is a subset of this dataset. For example:

 
    ds= DDataSet.createRank1(100);
    QDataSet trim= ds.trim(50,60);
    assert( trim.length()==10 );
 
 

Note start and end must be positive. Negative indices, referenced from the end of the dataset, are not supported here.

Specified by:

trim in interface QDataSet

Overrides:

trim in class AbstractDataSet

Parameters:

start - the first index to be included in the new dataset.

end - the exclusive index indicating the last index.

Returns:

a QDataSet with the same rank but fewer elements.