graphql.scalar.GraphqlCharCoercing Maven / Gradle / Ivy
package graphql.scalar;
import graphql.Internal;
import graphql.language.StringValue;
import graphql.schema.Coercing;
import graphql.schema.CoercingParseLiteralException;
import graphql.schema.CoercingParseValueException;
import graphql.schema.CoercingSerializeException;
import static graphql.scalar.CoercingUtil.typeName;
@Internal
public class GraphqlCharCoercing implements Coercing {
private Character convertImpl(Object input) {
if (input instanceof String && ((String) input).length() == 1) {
return ((String) input).charAt(0);
} else if (input instanceof Character) {
return (Character) input;
} else {
return null;
}
}
@Override
public Character serialize(Object input) {
Character result = convertImpl(input);
if (result == null) {
throw new CoercingSerializeException(
"Expected type 'Char' but was '" + typeName(input) + "'."
);
}
return result;
}
@Override
public Character parseValue(Object input) {
Character result = convertImpl(input);
if (result == null) {
throw new CoercingParseValueException(
"Expected type 'Char' but was '" + typeName(input) + "'."
);
}
return result;
}
@Override
public Character parseLiteral(Object input) {
if (!(input instanceof StringValue)) {
throw new CoercingParseLiteralException(
"Expected AST type 'StringValue' but was '" + typeName(input) + "'."
);
}
String value = ((StringValue) input).getValue();
if (value.length() != 1) {
throw new CoercingParseLiteralException(
"Empty 'StringValue' provided."
);
}
return value.charAt(0);
}
}