io.stargate.sgv2.graphql.schema.scalars.VarintCoercing Maven / Gradle / Ivy
/*
* Copyright The Stargate Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.stargate.sgv2.graphql.schema.scalars;
import graphql.language.IntValue;
import graphql.language.StringValue;
import graphql.schema.Coercing;
import graphql.schema.CoercingParseLiteralException;
import graphql.schema.CoercingParseValueException;
import graphql.schema.CoercingSerializeException;
import java.math.BigInteger;
/**
* Handles type conversions for CQL {@code varint}.
*
* Our default mapping is String: GraphQL int literals can in theory represent arbitrarily large
* numbers, but both query variables and results use JSON, where large number can cause
* interoperability issues (in particular, this happens with the playground web UI).
*
*
For convenience, we also allow ints on the way in: for inlined GraphQL literals this works for
* any value, for JSON only for the ones that are representable as a JSON literal.
*/
class VarintCoercing implements Coercing {
static VarintCoercing INSTANCE = new VarintCoercing();
private VarintCoercing() {}
@Override
public String serialize(Object dataFetcherResult) throws CoercingSerializeException {
assert dataFetcherResult instanceof BigInteger;
return dataFetcherResult.toString();
}
@Override
public BigInteger parseValue(Object input) throws CoercingParseValueException {
if (input instanceof BigInteger) {
return (BigInteger) input;
} else if (input instanceof Integer || input instanceof Long) {
long longValue = ((Number) input).longValue();
return BigInteger.valueOf(longValue);
} else if (input instanceof String) {
return parse((String) input);
} else {
throw new CoercingParseLiteralException("Expected a string or integer literal");
}
}
@Override
public BigInteger parseLiteral(Object input) throws CoercingParseLiteralException {
if (input instanceof StringValue) {
return parse(((StringValue) input).getValue());
} else if (input instanceof IntValue) {
return ((IntValue) input).getValue();
} else {
throw new CoercingParseLiteralException("Expected a string or integer literal");
}
}
private BigInteger parse(String s) {
try {
return new BigInteger(s);
} catch (NumberFormatException e) {
throw new CoercingParseLiteralException("Invalid format");
}
}
}