Packages

c

com.twitter.collection

RecordSchema

final class RecordSchema extends AnyRef

RecordSchema represents the declaration of a heterogeneous Record type, with Fields that are determined at runtime. A Field declares the static type of its associated values, so although the record itself is dynamic, field access is type-safe.

Given a RecordSchema declaration schema, any number of Records of that schema can be obtained with schema.newRecord. The type that Scala assigns to this value is what Scala calls a "path-dependent type," meaning that schema1.Record and schema2.Record name distinct types. The same is true of fields: schema1.Field[A] and schema2.Field[A] are distinct, and can only be used with the corresponding Record.

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Instance Constructors

  1. new RecordSchema()

Type Members

  1. sealed trait Field[A] extends AnyRef

    Field is a handle used to access some corresponding value in a Record.

    Field is a handle used to access some corresponding value in a Record. A field may also declare a default, which is computed for each record it is associated with, at most once per record instance.

  2. final class Record extends AnyRef

    Record is an instance of a RecordSchema declaration.

    Record is an instance of a RecordSchema declaration. Records are mutable; the update method assigns or reassigns a value to a given field. If the user requires that a field's assigned value is never reassigned later, the user can lock that field.

    Note that this implementation is not synchronized. If multiple threads access a record concurrently, and at least one of the threads modifies the record, it must be synchronized externally.

Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(arg0: Any): Boolean
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  8. def finalize(): Unit
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  9. final def getClass(): Class[_]
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  10. def hashCode(): Int
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  11. final def isInstanceOf[T0]: Boolean
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  12. final def ne(arg0: AnyRef): Boolean
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  13. def newField[A](defaultSupplier: ⇒ A): Field[A]

    Creates a new Field with the given defaultSupplier, to be used only with Records from this schema.

    Creates a new Field with the given defaultSupplier, to be used only with Records from this schema.

    defaultSupplier

    a computation producing the default value to use, when there is no value previously assigned to this field in a given record.

    returns

    a Field with the given defaultSupplier

  14. def newField[A](): Field[A]

    Creates a new Field with no default value, to be used only with Records from this schema.

    Creates a new Field with no default value, to be used only with Records from this schema.

    returns

    a Field with no default value

  15. def newRecord(): Record

    Creates a new Record from this Schema.

    Creates a new Record from this Schema.

    returns

    a new Record

  16. final def notify(): Unit
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  17. final def notifyAll(): Unit
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  18. final def synchronized[T0](arg0: ⇒ T0): T0
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  19. def toString(): String
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  20. final def wait(): Unit
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  21. final def wait(arg0: Long, arg1: Int): Unit
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  22. final def wait(arg0: Long): Unit
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