/*
* 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
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* 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
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package org.jooq.impl;
import static org.jooq.tools.Convert.convert;
import static org.jooq.tools.reflect.Reflect.wrapper;
import java.util.LinkedHashMap;
import java.util.Map;
A base class for enum conversion.
Author: Lukas Eder
/**
* A base class for enum conversion.
*
* @author Lukas Eder
*/
public class EnumConverter<T, U extends Enum<U>> extends AbstractConverter<T, U> {
Generated UID
/**
* Generated UID
*/
private static final long serialVersionUID = -6094337837408829491L;
private final Map<T, U> lookup;
private final EnumType enumType;
public EnumConverter(Class<T> fromType, Class<U> toType) {
super(fromType, toType);
// [#8045] Also support Kotlin Int type (which translates to int.class)
this.enumType = Number.class.isAssignableFrom(wrapper(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}
/**
* Subclasses may override this method to provide a custom reverse mapping
* implementation
* <p>
* {@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
/**
* The type of the converted <code>Enum</code>.
* <p>
* This corresponds to JPA's <code>EnumType</code>
*/
enum EnumType {
Ordinal enum type
/**
* Ordinal enum type
*/
ORDINAL,
String enum type
/**
* String enum type
*/
STRING
}
@Override
public String toString() {
return "EnumConverter [ " + fromType().getName() + " -> " + toType().getName() + " ]";
}
}