com.flipkart.hbaseobjectmapper.HBColumnMultiVersion Maven / Gradle / Ivy

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HBase ORM is a light-weight, thread-safe and performant library that enables: [1] object-oriented access of HBase rows (Data Access Object) with minimal code and good testability. [2] reading from and/or writing to HBase tables in Hadoop MapReduce jobs. This can also be used as an ORM for Bigtable.

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package com.flipkart.hbaseobjectmapper;

import com.flipkart.hbaseobjectmapper.codec.Codec;

import java.io.Serializable;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import java.lang.reflect.Type;
import java.util.Map;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * Maps an entity field of type NavigableMap<Long, T> to an HBase column whose data type is represented as data type T.
 * 
 * As the name explains, this annotation is the multi-version variant of {@link HBColumn}.
 * 

 * Please note: T must be {@link Serializable}
 */
@Target(FIELD)
@Retention(RUNTIME)
public @interface HBColumnMultiVersion {

    /**
     * Name of HBase column family
     *
     * @return Name of HBase column family
     */
    String family();

    /**
     * Name of HBase column
     *
     * @return Name of HBase column
     */
    String column();

    /**
     * [optional] flags to be passed to codec's {@link Codec#serialize(Serializable, Map) serialize} and {@link Codec#deserialize(byte[], Type, Map) deserialize} methods
     * 
     * Note: These flags will be passed as a Map<String, String> (param name and param value)
     *
     * @return Flags
     */
    Flag[] codecFlags() default {};

}