| /* |
| * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation from Oracle TopLink |
| package org.eclipse.persistence.mappings.querykeys; |
| |
| import org.eclipse.persistence.descriptors.ClassDescriptor; |
| import org.eclipse.persistence.exceptions.QueryException; |
| import org.eclipse.persistence.internal.helper.DatabaseTable; |
| |
| |
| /** <p> |
| * <b>Purpose</b>:Represents a m-m join query. |
| */ |
| public class ManyToManyQueryKey extends ForeignReferenceQueryKey { |
| |
| /** |
| * INTERNAL: |
| * override the isCollectionQueryKey() method in the superclass to return true. |
| * @return boolean |
| */ |
| @Override |
| public boolean isCollectionQueryKey() { |
| return true; |
| } |
| |
| /** |
| * INTERNAL: |
| * override the isManyToManyQueryKey() method in the superclass to return true. |
| * @return boolean |
| */ |
| @Override |
| public boolean isManyToManyQueryKey() { |
| return true; |
| } |
| |
| /** |
| * PUBLIC: |
| * Returns the reference table. |
| */ |
| @Override |
| public DatabaseTable getRelationTable(ClassDescriptor referenceDescriptor) { |
| DatabaseTable relationTable = super.getRelationTable(referenceDescriptor); |
| if(relationTable != null) { |
| return relationTable; |
| } else { |
| throw QueryException.noRelationTableInManyToManyQueryKey(this, this.joinCriteria); |
| } |
| } |
| } |