org.jooq.impl.EnumConverter Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
* All rights reserved.
*
* Licensed 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.
*
* Other licenses:
* -----------------------------------------------------------------------------
* Commercial licenses for this work are available. These replace the above
* ASL 2.0 and offer limited warranties, support, maintenance, and commercial
* database integrations.
*
* For more information, please visit: http://www.jooq.org/licenses
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.jooq.impl;
import static org.jooq.tools.Convert.convert;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* A base class for enum conversion.
*
* @author Lukas Eder
*/
public class EnumConverter> extends AbstractConverter {
/**
* Generated UID
*/
private static final long serialVersionUID = -6094337837408829491L;
private final Map lookup;
private final EnumType enumType;
public EnumConverter(Class fromType, Class toType) {
super(fromType, toType);
this.enumType = Number.class.isAssignableFrom(fromType) ? EnumType.ORDINAL : EnumType.STRING;
this.lookup = new LinkedHashMap();
for (U u : toType.getEnumConstants()) {
this.lookup.put(to(u), u);
}
}
@Override
public final U from(T databaseObject) {
return lookup.get(databaseObject);
}
/**
* Subclasses may override this method to provide a custom reverse mapping
* implementation
*
* {@inheritDoc}
*/
@Override
public T to(U userObject) {
if (userObject == null) {
return null;
}
else if (enumType == EnumType.ORDINAL) {
return convert(userObject.ordinal(), fromType());
}
else {
return convert(userObject.name(), fromType());
}
}
/**
* The type of the converted Enum.
*
* This corresponds to JPA's EnumType
*/
enum EnumType {
/**
* Ordinal enum type
*/
ORDINAL,
/**
* String enum type
*/
STRING
}
@Override
public String toString() {
return "EnumConverter [ " + fromType().getName() + " -> " + toType().getName() + " ]";
}
}