com.querydsl.collections

Class DefaultQueryEngine

java.lang.Object

com.querydsl.collections.DefaultQueryEngine

All Implemented Interfaces:

QueryEngine

public class DefaultQueryEngine
extends Object
implements QueryEngine

Default implementation of the QueryEngine interface

Author:

tiwe

Constructor Summary

Constructors

Constructor and Description
DefaultQueryEngine(DefaultEvaluatorFactory evaluatorFactory)

Method Summary

Modifier and Type	Method and Description
long	count(QueryMetadata metadata, Map<Expression<?>,Iterable<?>> iterables) Evaluate the given query and return the count of matched rows
boolean	exists(QueryMetadata metadata, Map<Expression<?>,Iterable<?>> iterables) Evaluate the given query return whether rows where matched
static QueryEngine	getDefault()
<T> List<T>	list(QueryMetadata metadata, Map<Expression<?>,Iterable<?>> iterables, Expression<T> projection) Evaluate the given query and return the projection as a list

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultQueryEngine

public DefaultQueryEngine(DefaultEvaluatorFactory evaluatorFactory)

Method Detail

getDefault

public static QueryEngine getDefault()

count

public long count(QueryMetadata metadata,
                  Map<Expression<?>,Iterable<?>> iterables)

Description copied from interface: QueryEngine

Evaluate the given query and return the count of matched rows

Specified by:

count in interface QueryEngine

Parameters:

metadata - query metadata

iterables - source contents

Returns:

matching row count

exists

public boolean exists(QueryMetadata metadata,
                      Map<Expression<?>,Iterable<?>> iterables)

Description copied from interface: QueryEngine

Evaluate the given query return whether rows where matched

Specified by:

exists in interface QueryEngine

Parameters:

metadata - query metadata

iterables - source contents

Returns:

true, if at least one row was matched

list

public <T> List<T> list(QueryMetadata metadata,
                        Map<Expression<?>,Iterable<?>> iterables,
                        Expression<T> projection)

Description copied from interface: QueryEngine

Evaluate the given query and return the projection as a list

Specified by:

list in interface QueryEngine

Parameters:

metadata - query metadata

iterables - source contents

Returns:

matching rows