com.amazon.carbonado.qe
Class SortedQueryExecutor<S extends Storable>

java.lang.Object
  com.amazon.carbonado.qe.AbstractQueryExecutor<S>
      com.amazon.carbonado.qe.SortedQueryExecutor<S>

All Implemented Interfaces:

QueryExecutor<S>

public class SortedQueryExecutor<S extends Storable>
extends AbstractQueryExecutor<S>

QueryExecutor which wraps another and sorts the results.

Author:

Brian S O'Neill

See Also:

SortedCursor

Nested Class Summary

static class	SortedQueryExecutor.ArraySortSupport<S extends Storable>
static class	SortedQueryExecutor.MergeSortSupport<S extends Storable>
static interface	SortedQueryExecutor.Support<S extends Storable> Provides support for SortedQueryExecutor.

Constructor Summary

SortedQueryExecutor(SortedQueryExecutor.Support<S> support, QueryExecutor<S> executor, OrderingList<S> handledOrdering, OrderingList<S> remainderOrdering)

Method Summary

long	count(FilterValues<S> values) Counts results by opening a cursor and skipping entries.
Cursor<S>	fetch(FilterValues<S> values) Returns a new cursor using the given filter values.
Filter<S>	getFilter() Returns the filter used by this QueryExecutor.
OrderingList<S>	getOrdering() Returns the result ordering of this QueryExecutor.
boolean	printNative(Appendable app, int indentLevel, FilterValues<S> values) Prints native query of the wrapped executor.
boolean	printPlan(Appendable app, int indentLevel, FilterValues<S> values) Prints the query plan to any appendable, if applicable.

Methods inherited from class com.amazon.carbonado.qe.AbstractQueryExecutor

fetchSlice, getStorableType, increaseIndent, indent, newline

Methods inherited from class java.lang.Object

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

Constructor Detail

SortedQueryExecutor

public SortedQueryExecutor(SortedQueryExecutor.Support<S> support,
                           QueryExecutor<S> executor,
                           OrderingList<S> handledOrdering,
                           OrderingList<S> remainderOrdering)

Parameters:

support - optional support to control sort buffer; if null, array is used

executor - executor to wrap

handledOrdering - optional handled ordering

remainderOrdering - required remainder ordering

Throws:

IllegalArgumentException - if executor is null or if remainder ordering is empty

Method Detail

fetch

public Cursor<S> fetch(FilterValues<S> values)
                                 throws FetchException

Description copied from interface: QueryExecutor

Returns a new cursor using the given filter values.

Throws:

FetchException

count

public long count(FilterValues<S> values)
           throws FetchException

Description copied from class: AbstractQueryExecutor

Counts results by opening a cursor and skipping entries. Subclasses are encouraged to override with a more efficient implementation.

Specified by:

count in interface QueryExecutor<S extends Storable>

Overrides:

count in class AbstractQueryExecutor<S extends Storable>

Throws:

FetchException

getFilter

public Filter<S> getFilter()

Description copied from interface: QueryExecutor

Returns the filter used by this QueryExecutor.

Returns:

query filter, never null

getOrdering

public OrderingList<S> getOrdering()

Description copied from interface: QueryExecutor

Returns the result ordering of this QueryExecutor.

Returns:

query ordering in an unmodifiable list

printNative

public boolean printNative(Appendable app,
                           int indentLevel,
                           FilterValues<S> values)
                    throws IOException

Prints native query of the wrapped executor.

Specified by:

printNative in interface QueryExecutor<S extends Storable>

Overrides:

printNative in class AbstractQueryExecutor<S extends Storable>

values - optional

Returns:

false if not implemented

Throws:

IOException

printPlan

public boolean printPlan(Appendable app,
                         int indentLevel,
                         FilterValues<S> values)
                  throws IOException

Description copied from interface: QueryExecutor

Prints the query plan to any appendable, if applicable.

values - optional

Returns:

false if not implemented

Throws:

IOException