org.apache.openjpa.jdbc.meta.strats.NumberVersionStrategy Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.jdbc.meta.strats;
import java.util.Map;
import java.util.HashMap;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.util.InternalException;
import org.apache.openjpa.jdbc.schema.Column;
/**
* Uses a version number for optimistic versioning.
*
* @author Abe White
*/
public class NumberVersionStrategy
extends ColumnVersionStrategy {
public static final String ALIAS = "version-number";
private Number _initial = 1;
/**
* Set the initial value for version column. Defaults to 1.
*/
public void setInitialValue(int initial) {
_initial = initial;
}
/**
* Return the initial value for version column. Defaults to 1.
*/
public int getInitialValue() {
return _initial.intValue();
}
public String getAlias() {
return ALIAS;
}
protected int getJavaType() {
return JavaTypes.INT;
}
protected Object nextVersion(Object version) {
if (version == null)
return _initial;
return ((Number) version).intValue() + 1;
}
public Map getBulkUpdateValues() {
Column[] cols = vers.getColumns();
Map map = new HashMap(cols.length);
for (int i = 0; i < cols.length; i++)
map.put(cols[i], cols[i].getName() + " + 1");
return map;
}
}