com.datastax.driver.extras.codecs.enums.EnumNameCodec Maven / Gradle / Ivy
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/*
* Copyright DataStax, Inc.
*
* 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.
*/
package com.datastax.driver.extras.codecs.enums;
import com.datastax.driver.core.TypeCodec;
import com.datastax.driver.extras.codecs.ParsingCodec;
/**
* A codec that serializes {@link Enum} instances as CQL {@code varchar}s representing their
* programmatic names as returned by {@link Enum#name()}.
*
* Note that this codec relies on the enum constant names; it is therefore vital that
* enum names never change.
*
* @param The Enum class this codec serializes from and deserializes to.
*/
public class EnumNameCodec> extends ParsingCodec {
private final Class enumClass;
public EnumNameCodec(Class enumClass) {
this(TypeCodec.varchar(), enumClass);
}
public EnumNameCodec(TypeCodec innerCodec, Class enumClass) {
super(innerCodec, enumClass);
this.enumClass = enumClass;
}
@Override
protected String toString(E value) {
return value == null ? null : value.name();
}
@Override
protected E fromString(String value) {
return value == null ? null : Enum.valueOf(enumClass, value);
}
}