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MapJoin.java
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MapJoin.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.model.query.criteria;
import java.util.Map;
import cz.cvut.kbss.jopa.model.metamodel.MapAttribute;
/**
* The MapJoin interface is the type of the result of joining to a collection
* over an association or element collection that has been specified as a
* java.util.Map.
*
* @param <Z>
* the source type of the join
* @param <K>
* the type of the target Map key
* @param <V>
* the type of the target Map value
*/
public interface MapJoin<Z, K, V> extends PluralJoin<Z, Map<K, V>, V> {
/**
* Return the metamodel representation for the map attribute.
*
* @return metamodel type representing the Map that is
*
* the target of the join
*/
MapAttribute<? super Z, K, V> getModel();
/**
* Create a path expression that corresponds to the map key.
*
* @return path corresponding to map key
*/
Path<K> key();
/**
* Create a path expression that corresponds to the map value. This method
* is for stylistic use only: it just returns this.
*
* @return path corresponding to the map value
*/
Path<V> value();
/**
* Create an expression that corresponds to the map entry.
*
* @return expression corresponding to the map entry
*/
Expression<Map.Entry<K, V>> entry();
}