net.sf.mmm.util.query.base

Class SingleQueryImpl<R,T>

java.lang.Object

net.sf.mmm.util.query.base.QueryImpl<R,R,T>

net.sf.mmm.util.query.base.SingleQueryImpl<R,T>

Type Parameters:

R - the generic type of the result.

T - the generic type of the internal ListQuery results.

All Implemented Interfaces:

Command, Query<R>, SingleQuery<R>

public class SingleQueryImpl<R,T>
extends QueryImpl<R,R,T>
implements SingleQuery<R>

This is the implementation of SingleQuery adapting a ListQuery.

Since:

8.0.0

Author:

hohwille

Field Summary

Fields

Modifier and Type	Field and Description
private ListQuery<T>	listQuery
private Function<T,R>	mapper

Constructor Summary

Constructors

Constructor and Description
SingleQueryImpl(AbstractSelectStatement<R,?,T> statement, ListQuery<T> listQuery, QueryMode mode, Function<T,R> mapper) The constructor.

Method Summary

Modifier and Type	Method and Description
R	execute() Executes the Query Command and returns the result.
R	executeRequired()
protected Function<T,R>	getMapper()

Methods inherited from class net.sf.mmm.util.query.base.QueryImpl

executeInternal, getMode, getSql, getStatement, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.mmm.util.query.api.Command

getSql

Field Detail

listQuery

private final ListQuery<T> listQuery

mapper

private final Function<T,R> mapper

Constructor Detail

SingleQueryImpl

public SingleQueryImpl(AbstractSelectStatement<R,?,T> statement,
                       ListQuery<T> listQuery,
                       QueryMode mode,
                       Function<T,R> mapper)

The constructor.

Parameters:

statement - the AbstractSelectStatement that created this Query.

listQuery - the ListQuery to adapt.

mode - the QueryMode.

mapper - the Function to map the results.

Method Detail

getMapper

protected Function<T,R> getMapper()

Returns:

the Function to map the original query results to the external result type. Will be the identity function if <T>=<E>.

execute

public R execute()

Description copied from interface: Query

Executes the Query Command and returns the result.

Specified by:

execute in interface Query<R>

Overrides:

execute in class QueryImpl<R,R,T>

Returns:

the result of the Query execution.

executeRequired

public R executeRequired()
                  throws ObjectNotFoundException

Specified by:

executeRequired in interface SingleQuery<R>

Returns:

the result of Query.execute() but never null.

Throws:

ObjectNotFoundException - if the query had no match.