com.datastax.driver.extras.codecs.enums.EnumNameCodec Maven / Gradle / Ivy

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A Shaded CQL ActivityType driver for http://nosqlbench.io/

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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
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);
  }
}