com.xeiam.xchange.utils.jackson.EnumIntDeserializer Maven / Gradle / Ivy

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Core functionality used by all other modules.

There is a newer version: 3.1.0

package com.xeiam.xchange.utils.jackson;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

/**
 * @author Matija Mazi 

 *         0-based enum deserializer. This wil deserialize 0 as the first enum constant, 1 as the second etc.
 */
public abstract class EnumIntDeserializer> extends JsonDeserializer {

  private Class enumClass;

  protected EnumIntDeserializer(Class enumClass) {

    this.enumClass = enumClass;
  }

  @Override
  public E deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {

    E[] constants = enumClass.getEnumConstants();
    return constants[jp.getValueAsInt() + getIndexBase()];
  }

  protected int getIndexBase() {

    return 0;
  }
}