Class Filters (2.19.0)

public final class Filters

A Fluent DSL to create a hierarchy of filters for the CheckAndMutateRow RPCs and ReadRows Query.

Intended usage is to statically import, or in case of conflict, assign the static variable FILTERS and use its fluent API to build filters.

Sample code:


 import static com.google.cloud.bigtable.data.v2.models.Filters.FILTERS;

 void main() {
   // Build the filter expression
   RowFilter filter = FILTERS.chain()
     .filter(FILTERS.qualifier().regex("prefix.*"))
     .filter(FILTERS.limit().cellsPerRow(10));

   // Use it in a Query
   Query query = Query.create("[TABLE]")
     .filter(filter);
 }

Inheritance

java.lang.Object > Filters

Inherited Members

Object.clone()

Object.equals(Object)

Object.finalize()

Object.getClass()

Object.hashCode()

Object.notify()

Object.notifyAll()

Object.toString()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Static Fields

FILTERS

public static final Filters FILTERS

Entry point into the DSL.

Field Value

Type	Description
`Filters`

Methods

block()

public Filters.Filter block()

Does not match any cells, regardless of input. Useful for temporarily disabling just part of a filter.

Returns

Type	Description
`Filters.Filter`

chain()

public Filters.ChainFilter chain()

Creates an empty chain filter list. Filters can be added to the chain by invoking ChainFilter#filter(Filters.Filter).

The elements of "filters" are chained together to process the input row:

in row -> filter0 -> intermediate row -> filter1 -> ... -> filterN -> out row

The full chain is executed atomically.

Returns

Type	Description
`Filters.ChainFilter`

condition(Filters.Filter predicate)

public Filters.ConditionFilter condition(Filters.Filter predicate)

Creates an empty condition filter. The filter results of the predicate can be configured by invoking ConditionFilter#then(Filters.Filter) and ConditionFilter#otherwise(Filters.Filter).

A RowFilter which evaluates one of two possible RowFilters, depending on whether or not a predicate RowFilter outputs any cells from the input row.

IMPORTANT NOTE: The predicate filter does not execute atomically with the ConditionFilter#then(Filters.Filter) and ConditionFilter#otherwise(Filters.Filter) (Filter)} filters, which may lead to inconsistent or unexpected results. Additionally, ConditionFilter may have poor performance, especially when filters are set for the ConditionFilter#otherwise(Filters.Filter).

Parameter

Name	Description
`predicate`	`Filters.Filter`

Returns

Type	Description
`Filters.ConditionFilter`

family()

public Filters.FamilyFilter family()

Returns the builder for column family related filters.

Returns

Type	Description
`Filters.FamilyFilter`

fromProto(RowFilter rowFilter)

public Filters.Filter fromProto(RowFilter rowFilter)

Wraps protobuf representation of a filter.

For advanced use only.

Parameter

Name	Description
`rowFilter`	`com.google.bigtable.v2.RowFilter`

Returns

Type	Description
`Filters.Filter`

interleave()

public Filters.InterleaveFilter interleave()

Creates an empty interleave filter list. Filters can be added to the interleave by invoking InterleaveFilter#filter(Filters.Filter).

The elements of "filters" all process a copy of the input row, and the results are pooled, sorted, and combined into a single output row. If multiple cells are produced with the same column and timestamp, they will all appear in the output row in an unspecified mutual order. The full chain is executed atomically.

Returns

Type	Description
`Filters.InterleaveFilter`

key()

public Filters.KeyFilter key()

Returns the builder for row key related filters.

Returns

Type	Description
`Filters.KeyFilter`

label(String label)

public Filters.Filter label(String label)

Applies the given label to all cells in the output row. This allows the caller to determine which results were produced from which part of the filter.

Due to a technical limitation, it is not currently possible to apply multiple labels to a cell. As a result, a ChainFilter may have no more than one sub-filter which contains a label. It is okay for an InterleaveFilter to contain multiple labels, as they will be applied to separate copies of the input. This may be relaxed in the future.

Parameter

Name	Description
`label`	`String`

Returns

Type	Description
`Filters.Filter`

limit()

public Filters.LimitFilter limit()

Returns the builder for limit related filters.

Returns

Type	Description
`Filters.LimitFilter`

offset()

public Filters.OffsetFilter offset()

Returns the builder for offset related filters.

Returns

Type	Description
`Filters.OffsetFilter`

pass()

public Filters.Filter pass()

Matches all cells, regardless of input. Functionally equivalent to having no filter.

Returns

Type	Description
`Filters.Filter`

qualifier()

public Filters.QualifierFilter qualifier()

Returns the builder for column qualifier related filters.

Returns

Type	Description
`Filters.QualifierFilter`

sink()

public Filters.Filter sink()

Outputs all cells directly to the output of the read rather than to any parent filter. For advanced usage, see comments in https://github.com/googleapis/googleapis/blob/master/google/bigtable/v2/data.proto for more details.

Returns

Type	Description
`Filters.Filter`

timestamp()

public Filters.TimestampFilter timestamp()

Returns the builder for timestamp related filters.

Returns

Type	Description
`Filters.TimestampFilter`

value()

public Filters.ValueFilter value()

Returns the builder for value related filters.

Returns

Type	Description
`Filters.ValueFilter`