org.das2.qds.JoinDataSet

Create a higher rank dataset with dim 0 being a JOIN dimension. Join implies that the joined datasets occupy the same physical dimension, and this can be thought of as the "array of" index. Note DEPEND_0 is treated as a special case of join. Note this dataset is mutable, and clients should not mutate it once the reference is made public.

JoinDataSet( int rank )

Creates a new instance of JoinDataSet

JoinDataSet( QDataSet ds1 )

create a new JoinDataSet, and join the first dataset.

ds1= Ops.rand(30);
jds= new JoinDataSet( ds1 );
assert( ds1.rank()==1 );
assert( jds.rank()==2 );
assert( jds.slice(0).equals(ds1) );

copy

copy( org.das2.qds.JoinDataSet joinDataSet ) → org.das2.qds.JoinDataSet

copy the JoinDataSet without copying each dataset it contains.

Parameters

joinDataSet - another JoinDataSet

Returns:

a copy of the dataset.

[search for examples] [view on GitHub] [view on old javadoc] [view source]

deepCopy

Deprecated: see WritableJoinDataSet

join

join( QDataSet ds ) → void

add the dataset to this set of joined datasets.

Parameters

ds - rank N-1 dataset where N is the rank of this JoinDataSet.

Returns:

void (returns nothing)

[search for examples] [view on GitHub] [view on old javadoc] [view source]

join

join( int index, QDataSet ds ) → void

set the dataset at the index. This must be used sequentially.

Parameters

index - the index of the dataset
ds - the dataset

Returns:

void (returns nothing)

[search for examples] [view on GitHub] [view on old javadoc] [view source]

joinAll

joinAll( org.das2.qds.JoinDataSet ds1 ) → void

copy all the records into this JoinDataSet. Note this is a shallow copy, and changes to one of the element datasets is visible in both JoinDataSets. TODO: this is probably under implemented, for example element properties.

Parameters

ds1 - a JoinDataSet

Returns:

void (returns nothing)

[search for examples] [view on GitHub] [view on old javadoc] [view source]

length

length( ) → int

Returns:

int

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length( int i0 ) → int [view source]
length( int i0, int i1 ) → int [view source]
length( int i0, int i1, int i2 ) → int [view source]

property

property( String name, int i0 ) → Object

Parameters

name - a String
i0 - an int

Returns:

java.lang.Object

[search for examples] [view on GitHub] [view on old javadoc] [view source]

property( String name ) → Object [view source]

putProperty

putProperty( String name, Object value ) → void

We override putProperty here because we remove the JOIN_0 if DEPEND_0 is set.

Parameters

name - a String
value - an Object

Returns:

void (returns nothing)

[search for examples] [view on GitHub] [view on old javadoc] [view source]

rank

rank( ) → int

Returns:

int

[search for examples] [view on GitHub] [view on old javadoc] [view source]

slice

slice( int idx ) → QDataSet

slice the dataset by returning the joined dataset at this index. If the dataset is a MutablePropertiesDataSet, then add the properties of this join dataset to it. The result is made a mutable properties dataset if it is not already, the danger here is that we may mutate the original data. Capabilities will fix this.