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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metricsproxy.metric.model.json;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.module.SimpleModule;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.util.Locale;
/**
* @author smorgrav
* @author gjoranv
*/
public class JacksonUtil {
private static final ThreadLocal<DecimalFormat> withinLongRangeFormat = ThreadLocal.withInitial(JacksonUtil::createWithinLongRangeFormat);
private static final ThreadLocal<DecimalFormat> outsideLongRangeFormat = ThreadLocal.withInitial(JacksonUtil::createOutsideLongRangeFormat);
private static DecimalFormat createWithinLongRangeFormat() {
DecimalFormat df = new DecimalFormat("#.####", new DecimalFormatSymbols(Locale.ENGLISH));
df.setMaximumFractionDigits(13);
return df;
}
private static DecimalFormat createOutsideLongRangeFormat() {
DecimalFormat df = new DecimalFormat("#.0###", new DecimalFormatSymbols(Locale.ENGLISH));
df.setMaximumFractionDigits(13);
return df;
}
/**
* Returns an object mapper with a custom floating point serializer to avoid scientific notation
*/
public static ObjectMapper createObjectMapper() {
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule("DoubleSerializer",
new Version(1, 0, 0, "", null, null));
module.addSerializer(Double.class, new DoubleSerializer());
mapper.registerModule(module);
return mapper;
}
/**
* Returns an object mapper with a custom floating point serializer to avoid scientific notation
*/
public static void writeDouble(JsonGenerator jgen, Double value) throws IOException {
jgen.writeNumber(format(value));
}
public static String format(Double value) {
return format(value, withinLongRangeFormat.get(), outsideLongRangeFormat.get());
}
private static String format(Double value, NumberFormat withinLongRange, NumberFormat outsideLongRange) {
if ((value <= Long.MAX_VALUE) && (value >= Long.MIN_VALUE)) {
return withinLongRange.format(value);
} else {
return outsideLongRange.format(value);
}
}
public static class DoubleSerializer extends JsonSerializer<Double> {
private DecimalFormat withinLongRangeFormat = createWithinLongRangeFormat();
private DecimalFormat outsideLongRangeFormat = createOutsideLongRangeFormat();
@Override
public void serialize(Double value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
jgen.writeNumber(format(value, withinLongRangeFormat, outsideLongRangeFormat));
}
}
}
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