| /* |
| * Copyright 2007-2009 Niclas Hedhman. |
| * Copyright 2008 Alin Dreghiciu. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| * implied. |
| * |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.qi4j.runtime.query; |
| |
| import org.qi4j.api.composite.Composite; |
| import org.qi4j.api.query.Query; |
| import org.qi4j.api.query.QueryBuilder; |
| import org.qi4j.api.query.QueryExpressions; |
| import org.qi4j.functional.Specification; |
| import org.qi4j.spi.query.EntityFinder; |
| import org.qi4j.spi.query.QueryBuilderSPI; |
| import org.qi4j.spi.query.QuerySource; |
| |
| /** |
| * Default implementation of {@link QueryBuilder} |
| */ |
| final class QueryBuilderImpl<T> |
| implements QueryBuilder<T>, QueryBuilderSPI<T> |
| { |
| |
| /** |
| * Entity finder to be used to locate entities. |
| */ |
| private final EntityFinder entityFinder; |
| |
| /** |
| * Type of queried entities. |
| */ |
| private final Class<T> resultType; |
| /** |
| * Where clause. |
| */ |
| private final Specification<Composite> whereClause; |
| |
| /** |
| * Constructor. |
| * |
| * @param entityFinder entity finder to be used to locate entities; canot be null |
| * @param resultType type of queried entities; cannot be null |
| * @param whereClause current where-clause |
| */ |
| QueryBuilderImpl( final EntityFinder entityFinder, |
| final Class<T> resultType, |
| final Specification<Composite> whereClause |
| ) |
| { |
| this.entityFinder = entityFinder; |
| this.resultType = resultType; |
| this.whereClause = whereClause; |
| } |
| |
| @Override |
| @SuppressWarnings( "unchecked" ) |
| public QueryBuilder<T> where( Specification<Composite> specification ) |
| { |
| if( specification == null ) |
| { |
| throw new IllegalArgumentException( "Where clause cannot be null" ); |
| } |
| if( this.whereClause != null ) |
| { |
| specification = QueryExpressions.and( this.whereClause, specification ); |
| } |
| return new QueryBuilderImpl<>( entityFinder, resultType, specification ); |
| } |
| |
| @Override |
| public Query<T> newQuery( Iterable<T> iterable ) |
| { |
| return new QueryImpl<>( resultType, whereClause, new IterableQuerySource( iterable ) ); |
| } |
| |
| // SPI |
| @Override |
| public Query<T> newQuery( QuerySource querySource ) |
| { |
| return new QueryImpl<>( resultType, whereClause, querySource ); |
| } |
| } |