package restx.jackson;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.deser.ContextualDeserializer;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import restx.jackson.FixedPrecision;
import java.io.IOException;
import java.lang.reflect.Field;
import java.math.BigDecimal;
/**
* User: xavierhanin
* Date: 2/2/13
* Time: 5:52 PM
*/
public class FixedPrecisionDeserializer extends StdDeserializer<BigDecimal> implements ContextualDeserializer {
private final int precision;
private final BigDecimal divisor;
public FixedPrecisionDeserializer() {
this(0);
}
public FixedPrecisionDeserializer(int precision) {
super(BigDecimal.class);
this.precision = precision;
divisor = new BigDecimal(10).pow(precision);
}
@Override
public BigDecimal deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
return new BigDecimal(jp.getLongValue()).divide(divisor);
}
@Override
public JsonDeserializer<?> createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException {
FixedPrecision fixedPrecision = ((Field) property.getMember().getMember()).getAnnotation(FixedPrecision.class);
if (fixedPrecision != null) {
return new FixedPrecisionDeserializer(fixedPrecision.value());
}
return this;
}
}