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Data Mapper package is a high-performance data binding package built on Jackson JSON processor

There is a newer version: 1.9.13

package org.codehaus.jackson.map;

import java.io.IOException;

import org.codehaus.jackson.*;

/**
 * Abstract class that defines API used for deserializing Json content
 * field names into Java Map keys. These deserializers are only used
 * if the Map key class is not String or Object.
 */
public abstract class KeyDeserializer
{
    public abstract Object deserializeKey(String key, DeserializationContext ctxt)
        throws IOException, JsonProcessingException;

    /**
     * This marker class is only to be used with annotations, to
     * indicate that no deserializer is configured.
     *
     * Specifically, this class is to be used as the marker for
     * annotation {@link org.codehaus.jackson.map.annotate.JsonDeserialize}.
     *
     * @since 1.3
     */
    public abstract static class None
        extends KeyDeserializer { }
}