/******************************************************************************* | |
* Copyright (c) 1998, 2013 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 v1.0 and Eclipse Distribution License v. 1.0 | |
* which accompanies this distribution. | |
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html | |
* and the Eclipse Distribution License is available at | |
* http://www.eclipse.org/org/documents/edl-v10.php. | |
* | |
* Contributors: | |
* Oracle - initial API and implementation from Oracle TopLink | |
******************************************************************************/ | |
package org.eclipse.persistence.descriptors; | |
import java.util.*; | |
import org.eclipse.persistence.internal.helper.*; | |
import org.eclipse.persistence.internal.sessions.AbstractRecord; | |
import org.eclipse.persistence.queries.*; | |
/** | |
* <p><b>Purpose</b>: An implementation of the OptimisticLockingPolicy interface. | |
* This policy compares every field in the table in the WHERE clause | |
* when doing an update or a delete. If any field has been changed, an | |
* optimistic locking exception will be thrown.<p> | |
* NOTE: This policy can only be used inside a unit of work. | |
* | |
* @since TopLink 2.1 | |
* @author Peter Krogh | |
*/ | |
public class AllFieldsLockingPolicy extends FieldsLockingPolicy { | |
/** | |
* PUBLIC: | |
* Create a new all fields locking policy. | |
* A field locking policy is based on locking on all fields by comparing with their previous values to detect field-level collisions. | |
* Note: the unit of work must be used for all updates when using field locking. | |
*/ | |
public AllFieldsLockingPolicy() { | |
super(); | |
} | |
/** | |
* INTERNAL: | |
* Values to be included in the locking mechanism are added | |
* to the translation row. Set the translation row to all the original field values. | |
*/ | |
@Override | |
public void addLockValuesToTranslationRow(ObjectLevelModifyQuery query) { | |
verifyUsage(query.getSession()); | |
query.setTranslationRow(descriptor.getObjectBuilder().buildRowForWhereClause(query)); | |
} | |
/** | |
* INTERNAL: | |
* Returns the fields that should be compared in the where clause. | |
* In this case, it is all the fields, except for the primary key | |
* and class indicator. | |
*/ | |
@Override | |
protected List<DatabaseField> getFieldsToCompare(DatabaseTable table, AbstractRecord transRow, AbstractRecord modifyRow) { | |
return getAllNonPrimaryKeyFields(table); | |
} | |
} |