package com.facebook.presto.jdbc.internal.jackson.databind.ser.std;
import java.io.IOException;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import com.facebook.presto.jdbc.internal.jackson.core.JsonGenerator;
import com.facebook.presto.jdbc.internal.jackson.core.JsonParser;
import com.facebook.presto.jdbc.internal.jackson.databind.*;
import com.facebook.presto.jdbc.internal.jackson.databind.annotation.JacksonStdImpl;
import com.facebook.presto.jdbc.internal.jackson.databind.jsonFormatVisitors.JsonFormatVisitorWrapper;
import com.facebook.presto.jdbc.internal.jackson.databind.jsonFormatVisitors.JsonNumberFormatVisitor;
/**
* As a fallback, we may need to use this serializer for other
* types of {@link Number}s: both custom types and "big" numbers
* like {@link BigInteger} and {@link BigDecimal}.
*/
@JacksonStdImpl
public final class NumberSerializer
extends StdScalarSerializer<Number>
{
public final static NumberSerializer instance = new NumberSerializer();
public NumberSerializer() { super(Number.class); }
@Override
public void serialize(Number value, JsonGenerator jgen, SerializerProvider provider) throws IOException
{
if (value instanceof BigDecimal) {
jgen.writeNumber((BigDecimal) value);
} else if (value instanceof BigInteger) {
jgen.writeNumber((BigInteger) value);
/* These shouldn't match (as there are more specific ones),
* but just to be sure:
*/
} else if (value instanceof Integer) {
jgen.writeNumber(value.intValue());
} else if (value instanceof Long) {
jgen.writeNumber(value.longValue());
} else if (value instanceof Double) {
jgen.writeNumber(value.doubleValue());
} else if (value instanceof Float) {
jgen.writeNumber(value.floatValue());
} else if ((value instanceof Byte) || (value instanceof Short)) {
jgen.writeNumber(value.intValue()); // doesn't need to be cast to smaller numbers
} else {
// We'll have to use fallback "untyped" number write method
jgen.writeNumber(value.toString());
}
}
@Override
public JsonNode getSchema(SerializerProvider provider, Type typeHint) {
return createSchemaNode("number", true);
}
@Override
public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) throws JsonMappingException
{
// Hmmh. What should it be? Ideally should probably indicate BIG_DECIMAL
// to ensure no information is lost? But probably won't work that well...
JsonNumberFormatVisitor v2 = visitor.expectNumberFormat(typeHint);
if (v2 != null) {
v2.numberType(JsonParser.NumberType.BIG_DECIMAL);
}
}
}