/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.persister.walking.spi;

import java.util.Arrays;


Used to uniquely identify a foreign key, so that we don't join it more than once creating circularities. Note that the table+columns refers to the association owner. These are used to help detect bi-directional associations since the Hibernate runtime metamodel (persisters) do not inherently know this information. For example, consider the Order -> Customer and Customer -> Order(s) bi-directional association; both would be mapped to the ORDER_TABLE.CUST_ID column. That is the purpose of this struct.

Bit of a misnomer to call this an association attribute. But this follows the legacy use of AssociationKey from old JoinWalkers to denote circular join detection
Author:Steve Ebersole, Gail Badner, Gavin King
/** * Used to uniquely identify a foreign key, so that we don't join it more than once creating circularities. Note * that the table+columns refers to the association owner. These are used to help detect bi-directional associations * since the Hibernate runtime metamodel (persisters) do not inherently know this information. For example, consider * the Order -> Customer and Customer -> Order(s) bi-directional association; both would be mapped to the * {@code ORDER_TABLE.CUST_ID} column. That is the purpose of this struct. * <p/> * Bit of a misnomer to call this an association attribute. But this follows the legacy use of AssociationKey * from old JoinWalkers to denote circular join detection * * @author Steve Ebersole * @author Gail Badner * @author Gavin King */
public class AssociationKey { private final String table; private final String[] columns;
Create the AssociationKey.
Params:
  • table – The table part of the association key
  • columns – The columns that define the association key
/** * Create the AssociationKey. * * @param table The table part of the association key * @param columns The columns that define the association key */
public AssociationKey(String table, String[] columns) { this.table = table; this.columns = columns; } @Override public boolean equals(Object o) { if ( this == o ) { return true; } if ( o == null || getClass() != o.getClass() ) { return false; } final AssociationKey that = (AssociationKey) o; return table.equals( that.table ) && Arrays.equals( columns, that.columns ); } @Override public int hashCode() { return table.hashCode(); } private String str; @Override public String toString() { if ( str == null ) { str = "AssociationKey(table=" + table + ", columns={" + String.join( ",", columns ) + "})"; } return str; } }