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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, 2013, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate;
import org.hibernate.type.VersionType;
/**
* Represents a replication strategy.
*
* @author Gavin King
* @see Session#replicate(Object, ReplicationMode)
*/
public enum ReplicationMode {
/**
* Throw an exception when a row already exists.
*/
EXCEPTION {
@Override
public boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType) {
throw new AssertionFailure( "should not be called" );
}
},
/**
* Ignore replicated entities when a row already exists.
*/
IGNORE {
@Override
public boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType) {
return false;
}
},
/**
* Overwrite existing rows when a row already exists.
*/
OVERWRITE {
@Override
public boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType) {
return true;
}
},
/**
* When a row already exists, choose the latest version.
*/
LATEST_VERSION {
@Override
@SuppressWarnings("unchecked")
public boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType) {
// always overwrite non-versioned data (because we don't know which is newer)
return versionType == null || versionType.getComparator().compare( currentVersion, newVersion ) <= 0;
}
};
/**
* Determine whether the mode dictates that the data being replicated should overwrite the data found.
*
* @param entity The entity being replicated
* @param currentVersion The version currently on the target database table.
* @param newVersion The replicating version
* @param versionType The version type
*
* @return {@code true} indicates the data should be overwritten; {@code false} indicates it should not.
*/
public abstract boolean shouldOverwriteCurrentVersion(Object entity, Object currentVersion, Object newVersion, VersionType versionType);
}
