com.dslplatform.json.parsers.JsIntegralParser Maven / Gradle / Ivy

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package com.dslplatform.json.parsers;

import com.dslplatform.json.JsonReader;
import com.dslplatform.json.MyNumberConverter;
import jsonvalues.JsBigInt;
import jsonvalues.spec.Error;

import java.io.IOException;
import java.math.BigInteger;
import java.util.Optional;
import java.util.function.Function;

final class JsIntegralParser extends AbstractParser {
    @Override
    JsBigInt value(final JsonReader reader) throws JsParserException {
        try {

            return JsBigInt.of(MyNumberConverter.parseDecimal(reader)
                                                .toBigIntegerExact());

        } catch (ArithmeticException | IOException e) {
            throw new JsParserException(reader.newParseError("Integral number expected"));
        }
    }

    JsBigInt valueSuchThat(final JsonReader reader,
                           final Function> fn
                          ) throws JsParserException {
        try {
            final BigInteger value = MyNumberConverter.parseDecimal(reader)
                                                      .toBigIntegerExact();
            final Optional result = fn.apply(value);
            if (!result.isPresent()) return JsBigInt.of(value);
            throw reader.newParseError(result.toString());
        } catch (IOException e) {
            throw new JsParserException(e.getMessage());

        }

    }


}