Merge pull request #83 from abelmosch/add-scalars

Added CountryCodeScalar & CurrencyScalar

Author: bbakerman

README.md

@@ -274,6 +274,56 @@ An example query to look for customers in the Romanian locale might look like:
     }
 
 ``` 
+## Country Code Scalar
+The CountryCode scalar type as defined by [ISO 3166-1 alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2).
+
+
+An example declaration in SDL might be:
+```graphql
+    scalar CountryCode
+
+    type Customer {
+      name : String
+      countryCode : CountryCode
+    }
+``` 
+
+And example query might look like:
+
+```graphql
+    query {
+       customers(code : "US") {
+                name
+                countryCode
+        }
+    }
+``` 
+## Currency Scalar
+
+A field whose value is an [ISO-4217](https://en.wikipedia.org/wiki/ISO_4217) currency.
+
+An example declaration in SDL might be:
+```graphql
+    scalar Currency
+
+    type Account {
+      id : String
+      currency : Currency
+      accountNumber: String
+    }
+``` 
+
+And example query might look like:
+
+```graphql
+    query {
+      accounts(currency : "USD") {
+        id
+        currency
+        accountNumber
+      }
+    }
+``` 
 
 ## Alias Scalars
 

src/main/java/graphql/scalars/ExtendedScalars.java

@@ -2,6 +2,8 @@
 
 import graphql.PublicApi;
 import graphql.scalars.alias.AliasedScalar;
+import graphql.scalars.country.code.CountryCodeScalar;
+import graphql.scalars.currency.CurrencyScalar;
 import graphql.scalars.datetime.DateScalar;
 import graphql.scalars.datetime.DateTimeScalar;
 import graphql.scalars.datetime.LocalTimeCoercing;
@@ -23,8 +25,6 @@
 import graphql.scalars.url.UrlScalar;
 import graphql.schema.GraphQLScalarType;
 
-import java.util.UUID;
-
 /**
  * This is the API entry point for all the extended scalars
  */
@@ -138,6 +138,18 @@ public class ExtendedScalars {
      */
     public static final GraphQLScalarType Locale = LocaleScalar.INSTANCE;
 
+    /**
+     * A field whose value is an ISO-4217 currency.
+     * See the <a href="https://en.wikipedia.org/wiki/ISO_4217">ISO-4217</a> for more details.
+     */
+    public static final GraphQLScalarType Currency = CurrencyScalar.INSTANCE;
+
+    /**
+     * The CountryCode scalar type as defined by ISO 3166-1 alpha-2.
+     * See the <a href="https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2">ISO 3166-1 alpha-2</a> for more details.
+     */
+    public static final GraphQLScalarType CountryCode = CountryCodeScalar.INSTANCE;
+
     /**
      * A UUID scalar that accepts a universally unique identifier and produces {@link
      * java.util.UUID} objects at runtime.

src/main/java/graphql/scalars/country/code/CountryCode.java

@@ -0,0 +1,18 @@
+package graphql.scalars.country.code;
+
+/**
+ * The CountryCode list as defined by ISO 3166-1 alpha-2.
+ * See the <a href="https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2">ISO 3166-1 alpha-2</a> for more details.
+ */
+public enum CountryCode {
+    AD, AE, AF, AG, AI, AL, AM, AO, AQ, AR, AS, AT, AU, AW, AX, AZ, BA, BB, BD, BE, BF, BG, BH, BI, BJ, BL, BM, BN, BO,
+    BQ, BR, BS, BT, BV, BW, BY, BZ, CA, CC, CD, CF, CG, CH, CI, CK, CL, CM, CN, CO, CR, CU, CV, CW, CX, CY, CZ, DE, DJ,
+    DK, DM, DO, DZ, EC, EE, EG, EH, ER, ES, ET, FI, FJ, FK, FM, FO, FR, GA, GB, GD, GE, GF, GG, GH, GI, GL, GM, GN, GP,
+    GQ, GR, GS, GT, GU, GW, GY, HK, HM, HN, HR, HT, HU, ID, IE, IL, IM, IN, IO, IQ, IR, IS, IT, JE, JM, JO, JP, KE, KG,
+    KH, KI, KM, KN, KP, KR, KW, KY, KZ, LA, LB, LC, LI, LK, LR, LS, LT, LU, LV, LY, MA, MC, MD, ME, MF, MG, MH, MK, ML,
+    MM, MN, MO, MP, MQ, MR, MS, MT, MU, MV, MW, MX, MY, MZ, NA, NC, NE, NF, NG, NI, NL, NO, NP, NR, NU, NZ, OM, PA, PE,
+    PF, PG, PH, PK, PL, PM, PN, PR, PS, PT, PW, PY, QA, RE, RO, RS, RU, RW, SA, SB, SC, SD, SE, SG, SH, SI, SJ, SK, SL,
+    SM, SN, SO, SR, SS, ST, SV, SX, SY, SZ, TC, TD, TF, TG, TH, TJ, TK, TL, TM, TN, TO, TR, TT, TV, TW, TZ, UA, UG, UM,
+    US, UY, UZ, VA, VC, VE, VG, VI, VN, VU, WF, WS, YE, YT, ZA, ZM, ZW
+}
+

src/main/java/graphql/scalars/country/code/CountryCodeScalar.java

@@ -0,0 +1,72 @@
+package graphql.scalars.country.code;
+
+import graphql.Internal;
+import graphql.language.StringValue;
+import graphql.language.Value;
+import graphql.schema.*;
+
+import java.util.function.Function;
+
+import static graphql.scalars.util.Kit.typeName;
+
+/**
+ * Access this via {@link graphql.scalars.ExtendedScalars#CountryCode}
+ */
+@Internal
+public class CountryCodeScalar {
+
+    public static final GraphQLScalarType INSTANCE;
+
+    static {
+        Coercing<CountryCode, String> coercing = new Coercing<CountryCode, String>() {
+
+            @Override
+            public String serialize(Object input) throws CoercingSerializeException {
+                CountryCode countryCode = parseCountryCode(input, CoercingParseValueException::new);
+                return countryCode.name();
+            }
+
+            @Override
+            public CountryCode parseValue(Object input) throws CoercingParseValueException {
+                return parseCountryCode(input, CoercingParseValueException::new);
+            }
+
+            @Override
+            public CountryCode parseLiteral(Object input) throws CoercingParseLiteralException {
+                if (!(input instanceof StringValue)) {
+                    throw new CoercingParseLiteralException("Expected AST type 'StringValue' but was '" + typeName(input) + "'.");
+                }
+                String stringValue = ((StringValue) input).getValue();
+                return parseCountryCode(stringValue, CoercingParseLiteralException::new);
+
+            }
+
+            @Override
+            public Value<?> valueToLiteral(Object input) {
+                String s = serialize(input);
+                return StringValue.newStringValue(s).build();
+            }
+
+            private CountryCode parseCountryCode(Object input, Function<String, RuntimeException> exceptionMaker) {
+                final CountryCode result;
+                if (input instanceof String) {
+                    try {
+                        result = CountryCode.valueOf((String) input);
+                    } catch (NullPointerException | IllegalArgumentException ex) {
+                        throw exceptionMaker.apply("Invalid ISO 3166-1 alpha-2 value : '" + input + "'. because of : '" + ex.getMessage() + "'");
+                    }
+                } else if (input instanceof CountryCode) {
+                    result = (CountryCode) input;
+                } else {
+                    throw exceptionMaker.apply("Expected a 'String' or 'CountryCode' but was '" + typeName(input) + "'.");
+                }
+                return result;
+            }
+        };
+
+        INSTANCE = GraphQLScalarType.newScalar()
+                .name("CountryCode")
+                .description("The CountryCode scalar type as defined by ISO 3166-1 alpha-2.")
+                .coercing(coercing).build();
+    }
+}

src/main/java/graphql/scalars/currency/CurrencyScalar.java

@@ -0,0 +1,73 @@
+package graphql.scalars.currency;
+
+import graphql.Internal;
+import graphql.language.StringValue;
+import graphql.language.Value;
+import graphql.schema.*;
+
+import java.util.Currency;
+import java.util.function.Function;
+
+import static graphql.scalars.util.Kit.typeName;
+
+/**
+ * Access this via {@link graphql.scalars.ExtendedScalars#Currency}
+ */
+@Internal
+public class CurrencyScalar {
+
+    public static final GraphQLScalarType INSTANCE;
+
+    static {
+        Coercing<Currency, String> coercing = new Coercing<Currency, String>() {
+            @Override
+            public String serialize(Object input) throws CoercingSerializeException {
+                Currency currency = parseCurrency(input, CoercingSerializeException::new);
+                return currency.getCurrencyCode();
+            }
+
+            @Override
+            public Currency parseValue(Object input) throws CoercingParseValueException {
+                return parseCurrency(input, CoercingParseValueException::new);
+            }
+
+
+            @Override
+            public Currency parseLiteral(Object input) throws CoercingParseLiteralException {
+                if (!(input instanceof StringValue)) {
+                    throw new CoercingParseLiteralException("Expected AST type 'StringValue' but was '" + typeName(input) + "'.");
+                }
+                String stringValue = ((StringValue) input).getValue();
+                return parseCurrency(stringValue, CoercingParseLiteralException::new);
+            }
+
+            @Override
+            public Value<?> valueToLiteral(Object input) {
+                String serializedInput = serialize(input);
+                return StringValue.newStringValue(serializedInput).build();
+            }
+
+
+            private Currency parseCurrency(Object input, Function<String, RuntimeException> exceptionMaker) {
+                final Currency result;
+                if (input instanceof Currency) {
+                    result = (Currency) input;
+                } else if (input instanceof String) {
+                    try {
+                        result = Currency.getInstance((String) input);
+                    } catch (NullPointerException | IllegalArgumentException ex) {
+                        throw exceptionMaker.apply("Invalid ISO 4217 value : '" + input + "'. because of : '" + ex.getMessage() + "'");
+                    }
+                } else {
+                    throw exceptionMaker.apply("Expected a 'String' or 'Currency' but was '" + typeName(input) + "'.");
+                }
+                return result;
+            }
+        };
+
+        INSTANCE = GraphQLScalarType.newScalar()
+                .name("Currency")
+                .description("An ISO-4217 compliant Currency Scalar")
+                .coercing(coercing).build();
+    }
+}