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    • org.hibernate.ReplicationMode Maven / Gradle / Ivy

    /*
 * 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 .
 */
package org.hibernate;

import org.hibernate.type.BasicType;

/**
 * Represents a replication strategy used by
 * {@link Session#replicate(Object, ReplicationMode)}.
 *
 * @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,
				BasicType 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,
				BasicType versionType) {
			return false;
		}
	},
	/**
	 * Overwrite existing rows when a row already exists.
	 */
	OVERWRITE {
		@Override
		public boolean shouldOverwriteCurrentVersion(
				Object entity,
				Object currentVersion, Object newVersion,
				BasicType versionType) {
			return true;
		}
	},
	/**
	 * When a row already exists, choose the latest version.
	 */
	LATEST_VERSION {
		@Override
		public boolean shouldOverwriteCurrentVersion(
				Object entity,
				Object currentVersion, Object newVersion,
				BasicType versionType) {
			// always overwrite non-versioned data (because we don't know which is newer)
			return versionType == null
				|| versionType.getJavaTypeDescriptor().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,
			BasicType versionType);

}
    
    
    
    

    




    
    
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