graphql.Scalars Maven / Gradle / Ivy
package graphql;
import graphql.language.BooleanValue;
import graphql.language.FloatValue;
import graphql.language.IntValue;
import graphql.language.StringValue;
import graphql.schema.Coercing;
import graphql.schema.GraphQLScalarType;
import java.math.BigDecimal;
import java.math.BigInteger;
public class Scalars {
private static final BigInteger LONG_MAX = BigInteger.valueOf(Long.MAX_VALUE);
private static final BigInteger LONG_MIN = BigInteger.valueOf(Long.MIN_VALUE);
private static final BigInteger INT_MAX = BigInteger.valueOf(Integer.MAX_VALUE);
private static final BigInteger INT_MIN = BigInteger.valueOf(Integer.MIN_VALUE);
private static final BigInteger BYTE_MAX = BigInteger.valueOf(Byte.MAX_VALUE);
private static final BigInteger BYTE_MIN = BigInteger.valueOf(Byte.MIN_VALUE);
private static final BigInteger SHORT_MAX = BigInteger.valueOf(Short.MAX_VALUE);
private static final BigInteger SHORT_MIN = BigInteger.valueOf(Short.MIN_VALUE);
private static boolean isWholeNumber(Object input) {
return input instanceof Long
|| input instanceof Integer
|| input instanceof Short
|| input instanceof Byte;
}
// true if its a number or string that we will attempt to convert to a number via toNumber()
private static boolean isNumberIsh(Object input) {
return input instanceof Number || input instanceof String;
}
private static Number toNumber(Object input) {
if (input instanceof Number) {
return (Number) input;
}
if (input instanceof String) {
// we go to double and then let each scalar type decide what precision they want from it. This
// will allow lenient behavior in string input as well as Number input... eg "42.3" as a string to a Long
// scalar is the same as new Double(42.3) to a Long scalar.
//
// each type will use Java Narrow casting to turn this into the desired type (Long, Integer, Short etc...)
//
// See http://docs.oracle.com/javase/specs/jls/se7/html/jls-5.html#jls-5.1.3
//
return Double.parseDouble((String) input);
}
// we never expect this and if we do, the code is wired wrong
throw new AssertException("Unexpected case - this call should be protected by a previous call to isNumberIsh()");
}
public static GraphQLScalarType GraphQLInt = new GraphQLScalarType("Int", "Built-in Int", new Coercing() {
@Override
public Integer serialize(Object input) {
if (input instanceof Integer) {
return (Integer) input;
} else if (isNumberIsh(input)) {
return toNumber(input).intValue();
} else {
return null;
}
}
@Override
public Integer parseValue(Object input) {
return serialize(input);
}
@Override
public Integer parseLiteral(Object input) {
if (!(input instanceof IntValue)) return null;
BigInteger value = ((IntValue) input).getValue();
if (value.compareTo(INT_MIN) == -1 || value.compareTo(INT_MAX) == 1) {
throw new GraphQLException("Int literal is too big or too small");
}
return value.intValue();
}
});
public static GraphQLScalarType GraphQLLong = new GraphQLScalarType("Long", "Long type", new Coercing() {
@Override
public Long serialize(Object input) {
if (input instanceof Long) {
return (Long) input;
} else if (isNumberIsh(input)) {
return toNumber(input).longValue();
} else {
return null;
}
}
@Override
public Long parseValue(Object input) {
return serialize(input);
}
@Override
public Long parseLiteral(Object input) {
if (input instanceof StringValue) {
return Long.parseLong(((StringValue) input).getValue());
} else if (input instanceof IntValue) {
BigInteger value = ((IntValue) input).getValue();
// Check if out of bounds.
if (value.compareTo(LONG_MIN) < 0 || value.compareTo(LONG_MAX) > 0) {
throw new GraphQLException("Int literal is too big or too small for a long, would cause overflow");
}
return value.longValue();
}
return null;
}
});
public static GraphQLScalarType GraphQLShort = new GraphQLScalarType("Short", "Built-in Short as Int", new Coercing() {
@Override
public Short serialize(Object input) {
if (input instanceof Short) {
return (Short) input;
} else if (isNumberIsh(input)) {
return toNumber(input).shortValue();
} else {
return null;
}
}
@Override
public Short parseValue(Object input) {
return serialize(input);
}
@Override
public Short parseLiteral(Object input) {
if (!(input instanceof IntValue)) return null;
BigInteger value = ((IntValue) input).getValue();
if (value.compareTo(SHORT_MIN) < 0 || value.compareTo(SHORT_MAX) > 0) {
throw new GraphQLException("Int literal is too big or too small for a short, would cause overflow");
}
return value.shortValue();
}
});
public static GraphQLScalarType GraphQLByte = new GraphQLScalarType("Byte", "Built-in Byte as Int", new Coercing() {
@Override
public Byte serialize(Object input) {
if (input instanceof Byte) {
return (Byte) input;
} else if (isNumberIsh(input)) {
return toNumber(input).byteValue();
} else {
return null;
}
}
@Override
public Byte parseValue(Object input) {
return serialize(input);
}
@Override
public Byte parseLiteral(Object input) {
if (!(input instanceof IntValue)) return null;
BigInteger value = ((IntValue) input).getValue();
if (value.compareTo(BYTE_MIN) < 0 || value.compareTo(BYTE_MAX) > 0) {
throw new GraphQLException("Int literal is too big or too small for a byte, would cause overflow");
}
return value.byteValue();
}
});
public static GraphQLScalarType GraphQLFloat = new GraphQLScalarType("Float", "Built-in Float", new Coercing() {
@Override
public Double serialize(Object input) {
if (input instanceof Double) {
return (Double) input;
} else if (isNumberIsh(input)) {
return toNumber(input).doubleValue();
} else {
return null;
}
}
@Override
public Double parseValue(Object input) {
return serialize(input);
}
@Override
public Double parseLiteral(Object input) {
if (input instanceof IntValue) {
return ((IntValue) input).getValue().doubleValue();
} else if (input instanceof FloatValue) {
return ((FloatValue) input).getValue().doubleValue();
} else {
return null;
}
}
});
public static GraphQLScalarType GraphQLBigInteger = new GraphQLScalarType("BigInteger", "Built-in java.math.BigInteger", new Coercing() {
@Override
public BigInteger serialize(Object input) {
if (input instanceof BigInteger) {
return (BigInteger) input;
} else if (input instanceof String) {
return new BigInteger((String) input);
} else if (isNumberIsh(input)) {
return BigInteger.valueOf(toNumber(input).longValue());
} else {
return null;
}
}
@Override
public BigInteger parseValue(Object input) {
return serialize(input);
}
@Override
public BigInteger parseLiteral(Object input) {
if (input instanceof StringValue) {
return new BigInteger(((StringValue) input).getValue());
} else if (input instanceof IntValue) {
return ((IntValue) input).getValue();
}
return null;
}
});
public static GraphQLScalarType GraphQLBigDecimal = new GraphQLScalarType("BigDecimal", "Built-in java.math.BigDecimal", new Coercing() {
@Override
public BigDecimal serialize(Object input) {
if (input instanceof BigDecimal) {
return (BigDecimal) input;
} else if (input instanceof String) {
return new BigDecimal((String) input);
} else if (isWholeNumber(input)) {
return BigDecimal.valueOf(toNumber(input).longValue());
} else if (input instanceof Number) {
return BigDecimal.valueOf(toNumber(input).doubleValue());
} else {
return null;
}
}
@Override
public BigDecimal parseValue(Object input) {
return serialize(input);
}
@Override
public BigDecimal parseLiteral(Object input) {
if (input instanceof StringValue) {
return new BigDecimal(((StringValue) input).getValue());
} else if (input instanceof IntValue) {
return new BigDecimal(((IntValue) input).getValue());
} else if (input instanceof FloatValue) {
return ((FloatValue) input).getValue();
}
return null;
}
});
public static GraphQLScalarType GraphQLString = new GraphQLScalarType("String", "Built-in String", new Coercing() {
@Override
public String serialize(Object input) {
return input == null ? null : input.toString();
}
@Override
public String parseValue(Object input) {
return serialize(input);
}
@Override
public String parseLiteral(Object input) {
if (!(input instanceof StringValue)) return null;
return ((StringValue) input).getValue();
}
});
public static GraphQLScalarType GraphQLBoolean = new GraphQLScalarType("Boolean", "Built-in Boolean", new Coercing() {
@Override
public Boolean serialize(Object input) {
if (input instanceof Boolean) {
return (Boolean) input;
} else if (input instanceof Integer) {
return (Integer) input > 0;
} else if (input instanceof String) {
return Boolean.parseBoolean((String) input);
} else {
return null;
}
}
@Override
public Boolean parseValue(Object input) {
return serialize(input);
}
@Override
public Boolean parseLiteral(Object input) {
if (!(input instanceof BooleanValue)) return null;
return ((BooleanValue) input).isValue();
}
});
public static GraphQLScalarType GraphQLID = new GraphQLScalarType("ID", "Built-in ID", new Coercing() {
@Override
public Object serialize(Object input) {
if (input instanceof String) {
return input;
}
if (input instanceof Integer) {
return String.valueOf(input);
}
return null;
}
@Override
public Object parseValue(Object input) {
return serialize(input);
}
@Override
public Object parseLiteral(Object input) {
if (input instanceof StringValue) {
return ((StringValue) input).getValue();
}
if (input instanceof IntValue) {
return ((IntValue) input).getValue().toString();
}
return null;
}
});
public static GraphQLScalarType GraphQLChar = new GraphQLScalarType("Char", "Built-in Char as Character", new Coercing() {
@Override
public Character serialize(Object input) {
if (input instanceof String) {
return ((String) input).length() != 1 ?
null : ((String) input).charAt(0);
} else if (input instanceof Character) {
return (Character) input;
} else {
return null;
}
}
@Override
public Character parseValue(Object input) {
return serialize(input);
}
@Override
public Character parseLiteral(Object input) {
if (!(input instanceof StringValue)) return null;
String value = ((StringValue) input).getValue();
if (value == null || value.length() != 1) return null;
return value.charAt(0);
}
});
}