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FetchParent.java
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FetchParent.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 cz.cvut.kbss.jopa.model.metamodel.PluralAttribute;
import cz.cvut.kbss.jopa.model.metamodel.SingularAttribute;
/**
* Represents an element of the from clause which may function as the parent of
* Fetches.
*
* @param <Z>
* the source type
* @param <X>
* the target type
*/
public interface FetchParent<Z, X> {
/**
* Return the fetch joins that have been made from this type. Returns empty
* set if no fetch joins have been made from this type. Modifications to the
* set do not affect the query.
*
* @return fetch joins made from this type
*/
java.util.Set<Fetch<X, ?>> getFetches();
/**
* Create a fetch join to the specified single-valued attribute using an
* inner join.
*
* @param attribute
* target of the join
* @return the resulting fetch join
**/
<Y> Fetch<X, Y> fetch(SingularAttribute<? super X, Y> attribute);
/**
* Create a fetch join to the specified single-valued attribute using the
* given join type.
*
* @param attribute
* target of the join
* @param jt
* join type
* @return the resulting fetch join
**/
<Y> Fetch<X, Y> fetch(SingularAttribute<? super X, Y> attribute, JoinType jt);
/**
* Create a fetch join to the specified collection-valued attribute using an
* inner join.
*
* @param attribute
* target of the join
* @return the resulting join
**/
<Y> Fetch<X, Y> fetch(PluralAttribute<? super X, ?, Y> attribute);
/**
* Create a fetch join to the specified collection-valued attribute using
* the given join type.
*
* @param attribute
* target of the join
* @param jt
* join type
* @return the resulting join
**/
<Y> Fetch<X, Y> fetch(PluralAttribute<? super X, ?, Y> attribute,
JoinType jt);
// String-based:
/**
* Create a fetch join to the specified attribute using an inner join.
*
* @param attributeName
* name of the attribute for the target of the join
* @return the resulting fetch join
* @throws IllegalArgumentException
* if attribute of the given name does not exist
**/
<Y> Fetch<X, Y> fetch(String attributeName);
/**
* Create a fetch join to the specified attribute using the given join type.
*
* @param attributeName
* name of the attribute for the target of the join
* @param jt
* join type
* @return the resulting fetch join
* @throws IllegalArgumentException
* if attribute of the given name does not exist
**/
<Y> Fetch<X, Y> fetch(String attributeName, JoinType jt);
}