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gwt-jackson is a GWT JSON serializer/deserializer mechanism based on Jackson annotations

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package com.github.nmorel.gwtjackson.client.deser;

import java.io.IOException;

import com.github.nmorel.gwtjackson.client.JsonDeserializationContext;
import com.github.nmorel.gwtjackson.client.JsonDeserializer;
import com.github.nmorel.gwtjackson.client.stream.JsonReader;

/**
 * Default {@link JsonDeserializer} implementation for {@link Enum}.
 *
 * @param  Type of the enum
 *
 * @author Nicolas Morel
 */
public class EnumJsonDeserializer> extends JsonDeserializer {

    /**
     * @param enumClass class of the enumeration
     * @param  Type of the enum
     *
     * @return a new instance of {@link EnumJsonDeserializer}
     */
    public static > EnumJsonDeserializer newInstance( Class enumClass ) {
        return new EnumJsonDeserializer( enumClass );
    }

    private final Class enumClass;

    /**
     * @param enumClass class of the enumeration
     */
    protected EnumJsonDeserializer( Class enumClass ) {
        if ( null == enumClass ) {
            throw new IllegalArgumentException( "enumClass cannot be null" );
        }
        this.enumClass = enumClass;
    }

    @Override
    public E doDeserialize( JsonReader reader, JsonDeserializationContext ctx ) throws IOException {
        return Enum.valueOf( enumClass, reader.nextString() );
    }
}