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Merge pull request #132 from AlexandreCarlton/add-accurate-duration-and-nominal-duration
Add AccurateDuration and NominalDuration Scalars
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‎src/main/java/graphql/scalars/ExtendedScalars.java

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@@ -7,7 +7,9 @@
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import graphql.scalars.currency.CurrencyScalar;
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import graphql.scalars.datetime.DateScalar;
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import graphql.scalars.datetime.DateTimeScalar;
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import graphql.scalars.datetime.AccurateDurationScalar;
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import graphql.scalars.datetime.LocalTimeCoercing;
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import graphql.scalars.datetime.NominalDurationScalar;
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import graphql.scalars.datetime.TimeScalar;
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import graphql.scalars.datetime.YearMonthScalar;
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import graphql.scalars.datetime.YearScalar;
@@ -107,6 +109,35 @@ public class ExtendedScalars {
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.coercing(new LocalTimeCoercing())
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.build();
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/**
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* A duration scalar that accepts string values like `P1DT2H3M4.5s` and produces * `java.time.Duration` objects at runtime.
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* <p>
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* Components like years and months are not supported as these may have different meanings depending on the placement in the calendar year.
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* <p>
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* Its {@link graphql.schema.Coercing#serialize(java.lang.Object)} and {@link graphql.schema.Coercing#parseValue(java.lang.Object)} methods
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* accept Duration and formatted Strings as valid objects.
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* <p>
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* See the ISO 8601 for more details on the format.
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*
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* @see java.time.Duration
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*/
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public static final GraphQLScalarType AccurateDuration = AccurateDurationScalar.INSTANCE;
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/**
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* An RFC-3339 compliant duration scalar that accepts string values like `P1Y2M3D` and produces
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* `java.time.Period` objects at runtime.
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* <p>
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* Components like hours and seconds are not supported as these are handled by {@link #AccurateDuration}.
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* <p>
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* Its {@link graphql.schema.Coercing#serialize(java.lang.Object)} and {@link graphql.schema.Coercing#parseValue(java.lang.Object)} methods
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* accept Period and formatted Strings as valid objects.
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* <p>
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* See the ISO 8601 for more details on the format.
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*
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* @see java.time.Period
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*/
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public static final GraphQLScalarType NominalDuration = NominalDurationScalar.INSTANCE;
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/**
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* An object scalar allows you to have a multi level data value without defining it in the graphql schema.
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* <p>

‎src/main/java/graphql/scalars/datetime/AccurateDurationScalar.java

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package graphql.scalars.datetime;
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import graphql.Internal;
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import graphql.language.StringValue;
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import graphql.language.Value;
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import graphql.schema.Coercing;
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import graphql.schema.CoercingParseLiteralException;
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import graphql.schema.CoercingParseValueException;
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import graphql.schema.CoercingSerializeException;
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import graphql.schema.GraphQLScalarType;
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import java.time.Duration;
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import java.time.format.DateTimeParseException;
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import java.util.function.Function;
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import static graphql.scalars.util.Kit.typeName;
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/**
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* Access this via {@link graphql.scalars.ExtendedScalars#AccurateDuration}
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*/
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@Internal
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public class AccurateDurationScalar {
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public static final GraphQLScalarType INSTANCE;
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private AccurateDurationScalar() {}
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static {
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Coercing<Duration, String> coercing = new Coercing<Duration, String>() {
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@Override
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public String serialize(Object input) throws CoercingSerializeException {
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Duration duration;
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if (input instanceof Duration) {
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duration = (Duration) input;
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} else if (input instanceof String) {
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duration = parseDuration(input.toString(), CoercingSerializeException::new);
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} else {
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throw new CoercingSerializeException(
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"Expected something we can convert to 'java.time.Duration' but was '" + typeName(input) + "'."
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);
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}
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return duration.toString();
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}
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@Override
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public Duration parseValue(Object input) throws CoercingParseValueException {
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Duration duration;
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if (input instanceof Duration) {
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duration = (Duration) input;
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} else if (input instanceof String) {
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duration = parseDuration(input.toString(), CoercingParseValueException::new);
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} else {
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throw new CoercingParseValueException(
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"Expected a 'String' but was '" + typeName(input) + "'."
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);
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}
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return duration;
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}
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@Override
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public Duration parseLiteral(Object input) throws CoercingParseLiteralException {
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if (!(input instanceof StringValue)) {
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throw new CoercingParseLiteralException(
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"Expected AST type 'StringValue' but was '" + typeName(input) + "'."
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);
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}
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return parseDuration(((StringValue) input).getValue(), CoercingParseLiteralException::new);
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}
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@Override
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public Value<?> valueToLiteral(Object input) {
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String s = serialize(input);
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return StringValue.newStringValue(s).build();
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}
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private Duration parseDuration(String s, Function<String, RuntimeException> exceptionMaker) {
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try {
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return Duration.parse(s);
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} catch (DateTimeParseException e) {
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throw exceptionMaker.apply("Invalid ISO 8601 value : '" + s + "'. because of : '" + e.getMessage() + "'");
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}
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}
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};
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INSTANCE = GraphQLScalarType.newScalar()
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.name("AccurateDuration")
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.description("A ISO 8601 duration scalar with only day, hour, minute, second components.")
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.specifiedByUrl("https://scalars.graphql.org/AlexandreCarlton/accurate-duration") // TODO: Change to .specifiedByURL when builder added to graphql-java
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.coercing(coercing)
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.build();
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}
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}

‎src/main/java/graphql/scalars/datetime/NominalDurationScalar.java

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package graphql.scalars.datetime;
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import graphql.Internal;
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import graphql.language.StringValue;
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import graphql.language.Value;
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import graphql.schema.Coercing;
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import graphql.schema.CoercingParseLiteralException;
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import graphql.schema.CoercingParseValueException;
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import graphql.schema.CoercingSerializeException;
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import graphql.schema.GraphQLScalarType;
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import java.time.Period;
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import java.time.format.DateTimeParseException;
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import java.util.function.Function;
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import static graphql.scalars.util.Kit.typeName;
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/**
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* Access this via {@link graphql.scalars.ExtendedScalars#NominalDuration}
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*/
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@Internal
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public class NominalDurationScalar {
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public static final GraphQLScalarType INSTANCE;
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private NominalDurationScalar() {}
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static {
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Coercing<Period, String> coercing = new Coercing<Period, String>() {
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@Override
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public String serialize(Object input) throws CoercingSerializeException {
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Period period;
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if (input instanceof Period) {
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period = (Period) input;
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} else if (input instanceof String) {
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period = parsePeriod(input.toString(), CoercingSerializeException::new);
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} else {
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throw new CoercingSerializeException(
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"Expected something we can convert to 'java.time.OffsetDateTime' but was '" + typeName(input) + "'."
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);
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}
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return period.toString();
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}
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@Override
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public Period parseValue(Object input) throws CoercingParseValueException {
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Period period;
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if (input instanceof Period) {
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period = (Period) input;
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} else if (input instanceof String) {
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period = parsePeriod(input.toString(), CoercingParseValueException::new);
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} else {
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throw new CoercingParseValueException(
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"Expected a 'String' but was '" + typeName(input) + "'."
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);
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}
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return period;
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}
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@Override
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public Period parseLiteral(Object input) throws CoercingParseLiteralException {
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if (!(input instanceof StringValue)) {
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throw new CoercingParseLiteralException(
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"Expected AST type 'StringValue' but was '" + typeName(input) + "'."
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);
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}
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return parsePeriod(((StringValue) input).getValue(), CoercingParseLiteralException::new);
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}
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@Override
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public Value<?> valueToLiteral(Object input) {
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String s = serialize(input);
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return StringValue.newStringValue(s).build();
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}
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private Period parsePeriod(String s, Function<String, RuntimeException> exceptionMaker) {
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try {
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return Period.parse(s);
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} catch (DateTimeParseException e) {
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throw exceptionMaker.apply("Invalid ISO 8601 value : '" + s + "'. because of : '" + e.getMessage() + "'");
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}
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}
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};
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INSTANCE = GraphQLScalarType.newScalar()
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.name("NominalDuration")
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.description("A ISO 8601 duration with only year, month, week and day components.")
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.specifiedByUrl("https://scalars.graphql.org/AlexandreCarlton/nominal-duration") // TODO: Change to .specifiedByURL when builder added to graphql-java
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.coercing(coercing)
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.build();
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}
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}

‎src/test/groovy/graphql/scalars/datetime/AccurateDurationScalarTest.groovy

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package graphql.scalars.datetime
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import graphql.language.StringValue
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import graphql.scalars.ExtendedScalars
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import graphql.schema.CoercingParseLiteralException
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import graphql.schema.CoercingParseValueException
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import graphql.schema.CoercingSerializeException
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import spock.lang.Specification
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import spock.lang.Unroll
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import java.time.Period
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import java.time.temporal.ChronoUnit
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import static graphql.scalars.util.TestKit.mkDuration
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import static graphql.scalars.util.TestKit.mkStringValue
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class AccurateDurationScalarTest extends Specification {
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def coercing = ExtendedScalars.AccurateDuration.getCoercing()
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@Unroll
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def "accurateduration parseValue"() {
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when:
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def result = coercing.parseValue(input)
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then:
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result == expectedValue
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where:
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input | expectedValue
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"PT1S" | mkDuration("PT1S")
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"PT1.5S" | mkDuration("PT1.5S")
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"P1DT2H3M4S" | mkDuration("P1DT2H3M4S")
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"-P1DT2H3M4S" | mkDuration("-P1DT2H3M4S")
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"P1DT-2H3M4S" | mkDuration("P1DT-2H3M4S")
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mkDuration(amount: 123456, unit: ChronoUnit.HOURS) | mkDuration("PT123456H")
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}
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@Unroll
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def "accurateduration valueToLiteral"() {
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when:
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def result = coercing.valueToLiteral(input)
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then:
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result.isEqualTo(expectedValue)
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where:
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input | expectedValue
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"PT1S" | mkStringValue("PT1S")
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"PT1.5S" | mkStringValue("PT1.5S")
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"P1D" | mkStringValue("PT24H")
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"P1DT2H3M4S" | mkStringValue("PT26H3M4S")
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mkDuration("P1DT2H3M4S") | mkStringValue("PT26H3M4S")
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mkDuration("-P1DT2H3M4S") | mkStringValue("PT-26H-3M-4S")
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mkDuration(amount: 123456, unit: ChronoUnit.HOURS) | mkStringValue("PT123456H")
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}
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@Unroll
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def "accurateduration parseValue bad inputs"() {
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when:
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coercing.parseValue(input)
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then:
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thrown(expectedValue)
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where:
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input | expectedValue
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"P1M" | CoercingParseValueException
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"P1MT2H" | CoercingParseValueException
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"P2W" | CoercingParseValueException
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"P3Y" | CoercingParseValueException
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123 | CoercingParseValueException
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"" | CoercingParseValueException
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Period.of(1, 2, 3) | CoercingParseValueException
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}
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def "accurateduration AST literal"() {
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when:
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def result = coercing.parseLiteral(input)
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then:
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result == expectedValue
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where:
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input | expectedValue
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new StringValue("P1DT2H3M4S") | mkDuration("P1DT2H3M4S")
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}
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def "accurateduration serialisation"() {
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when:
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def result = coercing.serialize(input)
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then:
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result == expectedValue
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where:
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input | expectedValue
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"PT1S" | "PT1S"
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"PT1.5S" | "PT1.5S"
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"P1DT2H3M4S" | "PT26H3M4S"
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"-P1DT2H3M4S" | "PT-26H-3M-4S"
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"P1DT-2H3M4S" | "PT22H3M4S"
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mkDuration("P1DT-2H3M4S") | "PT22H3M4S"
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mkDuration(amount: 123456, unit: ChronoUnit.HOURS) | "PT123456H"
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}
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def "accurateduration serialisation bad inputs"() {
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when:
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coercing.serialize(input)
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then:
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thrown(expectedValue)
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where:
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input | expectedValue
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"P1M" | CoercingSerializeException
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"PT1.5M" | CoercingSerializeException
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"P1MT2H" | CoercingSerializeException
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"P2W" | CoercingSerializeException
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"P3Y" | CoercingSerializeException
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123 | CoercingSerializeException
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"" | CoercingSerializeException
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Period.of(1, 2, 3) | CoercingSerializeException
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}
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@Unroll
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def "accurateduration parseLiteral bad inputs"() {
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when:
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coercing.parseLiteral(input)
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then:
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thrown(expectedValue)
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where:
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input | expectedValue
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"P1M" | CoercingParseLiteralException
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"PT1.5M" | CoercingParseLiteralException
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"P1MT2H" | CoercingParseLiteralException
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"P2W" | CoercingParseLiteralException
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"P3Y" | CoercingParseLiteralException
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123 | CoercingParseLiteralException
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"" | CoercingParseLiteralException
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Period.of(1, 2, 3) | CoercingParseLiteralException
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}
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}

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