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package com.flipkart.hbaseobjectmapper.codec;
import com.fasterxml.jackson.databind.*;
import com.flipkart.hbaseobjectmapper.Flag;
import com.flipkart.hbaseobjectmapper.codec.exceptions.DeserializationException;
import com.flipkart.hbaseobjectmapper.codec.exceptions.SerializationException;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.Serializable;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.util.Map;
/**
* This is an implementation of {@link Codec} that:
*
* - uses HBase's native methods to serialize objects of data types {@link Boolean}, {@link Short}, {@link Integer}, {@link Long}, {@link Float}, {@link Double}, {@link String} and {@link BigDecimal}
* - uses Jackson's JSON serializer for all other data types
* - serializes
null as null
*
*
* This codec takes the following {@link Flag Flag}s:
*
* {@link #SERIALIZE_AS_STRING}: When this flag is "true", this codec stores field/rowkey values in it's string representation (e.g. 560034 is serialized into a byte[] that represents the string "560034"). This flag applies only to fields or rowkeys of data types in point 1 above.
*
* This is the default codec for {@link com.flipkart.hbaseobjectmapper.HBObjectMapper HBObjectMapper}.
*/
public class BestSuitCodec implements Codec {
public static final String SERIALIZE_AS_STRING = "serializeAsString";
private final ObjectMapper objectMapper;
/**
* Construct an object of class {@link BestSuitCodec} with custom instance of Jackson's Object Mapper
*
* @param objectMapper Instance of Jackson's Object Mapper
*/
@SuppressWarnings("WeakerAccess")
public BestSuitCodec(ObjectMapper objectMapper) {
this.objectMapper = objectMapper;
}
/**
* Construct an object of class {@link BestSuitCodec}
*/
public BestSuitCodec() {
this(getObjectMapper());
}
private static ObjectMapper getObjectMapper() {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
return objectMapper;
}
/*
* @inherit
*/
@Override
public byte[] serialize(Serializable object, Map flags) throws SerializationException {
if (object == null) {
return null;
}
Class clazz = object.getClass();
if (isSerializeAsStringTrue(flags)) {
object = String.valueOf(object);
clazz = String.class;
}
try {
if (clazz == String.class) {
return Bytes.toBytes((String) object);
} else if (clazz == Integer.class) {
return Bytes.toBytes((int) object);
} else if (clazz == Short.class) {
return Bytes.toBytes((short) object);
} else if (clazz == Long.class) {
return Bytes.toBytes((long) object);
} else if (clazz == Float.class) {
return Bytes.toBytes((float) object);
} else if (clazz == Double.class) {
return Bytes.toBytes((double) object);
} else if (clazz == BigDecimal.class) {
return Bytes.toBytes((BigDecimal) object);
} else if (clazz == Boolean.class) {
return Bytes.toBytes((boolean) object);
}
} catch (Exception e) {
throw new SerializationException(String.format("Could not serialize value of type %s using HBase's native methods", clazz.getName()), e);
}
try {
return objectMapper.writeValueAsBytes(object);
} catch (Exception e) {
throw new SerializationException("Could not serialize object to JSON using Jackson", e);
}
}
/*
* @inherit
*/
@Override
public Serializable deserialize(byte[] bytes, Type type, Map flags) throws DeserializationException {
if (bytes == null)
return null;
boolean serializeAsString = isSerializeAsStringTrue(flags);
if (type instanceof Class) {
if (serializeAsString) {
try {
String string = Bytes.toString(bytes);
if (type == Integer.class) {
return Integer.valueOf(string);
} else if (type == Long.class) {
return Long.valueOf(string);
} else if (type == Short.class) {
return Short.valueOf(string);
} else if (type == Float.class) {
return Float.valueOf(string);
} else if (type == Double.class) {
return Double.valueOf(string);
} else if (type == BigDecimal.class) {
return new BigDecimal(string);
} else if (type == Boolean.class) {
return Boolean.valueOf(string);
}
} catch (Exception e) {
throw new DeserializationException("Could not deserialize byte array into an object using HBase's native methods (note: serialize as string is on)", e);
}
} else {
try {
if (type == String.class) {
return Bytes.toString(bytes);
} else if (type == Integer.class) {
return Bytes.toInt(bytes);
} else if (type == Long.class) {
return Bytes.toLong(bytes);
} else if (type == Short.class) {
return Bytes.toShort(bytes);
} else if (type == Float.class) {
return Bytes.toFloat(bytes);
} else if (type == Double.class) {
return Bytes.toDouble(bytes);
} else if (type == BigDecimal.class) {
return Bytes.toBigDecimal(bytes);
} else if (type == Boolean.class) {
return Bytes.toBoolean(bytes);
}
} catch (Exception e) {
throw new DeserializationException("Could not deserialize byte array into an object using HBase's native methods", e);
}
}
}
JavaType javaType = null;
try {
javaType = objectMapper.constructType(type);
return objectMapper.readValue(bytes, javaType);
} catch (
Exception e) {
throw new DeserializationException(String.format("Could not deserialize JSON into an object of type %s using Jackson%n(Jackson resolved type = %s)", type, javaType), e);
}
}
/*
* @inherit
*/
@Override
public boolean canDeserialize(Type type) {
JavaType javaType = objectMapper.constructType(type);
return objectMapper.canDeserialize(javaType);
}
private static boolean isSerializeAsStringTrue(Map flags) {
return flags != null && flags.get(SERIALIZE_AS_STRING) != null && flags.get(SERIALIZE_AS_STRING).equalsIgnoreCase("true");
}
}