Overview | Package | Class | Use | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## javax.jdo.datastore
Interface Sequence

    public interface Sequence

Implementations of this interface can be used to obtain sequences. The behavior with regard to the transaction and rollover behavior are defined in the metadata.

Since:
  2.0
Version:
  2.0

Method Summary
`void` | `allocate(int additional)` Provides a hint to the implementation that the application will need `additional` sequence value objects in short order.
`java.lang.Object` | `current()` Returns the current sequence value object if it is available.
`long` | `currentValue()` Returns the current sequence value as a long.
`java.lang.String` | `getName()` Returns the fully qualified name of the `Sequence`.
`java.lang.Object` | `next()` Returns the next sequence value as an Object.
`long` | `nextValue()` Returns the next sequence value as a long.

Method Detail

### getName

    java.lang.String getName()

  Returns the fully qualified name of the `Sequence`.

  Returns:
    the name of the sequence

### next

    java.lang.Object next()

  Returns the next sequence value as an Object. If the next sequence value is not available, throw JDODataStoreException.

  Returns:
    the next value

### allocate

    void allocate(int additional)

  Provides a hint to the implementation that the application will need `additional` sequence value objects in short order. There is no externally visible behavior of this method. It is used to potentially improve the efficiency of the algorithm of obtaining additional sequence value objects.

  Parameters:
    `additional` - the number of additional values to allocate

### current

    java.lang.Object current()

  Returns the current sequence value object if it is available. It is intended to return a sequence value object previously used. If the current sequence value is not available, throw JDODataStoreException.

  Returns:
    the current value

### nextValue

    long nextValue()

  Returns the next sequence value as a long. If the next sequence value is not available or is not numeric, throw JDODataStoreException.

  Returns:
    the next value

### currentValue

    long currentValue()

  Returns the current sequence value as a long. If the current sequence value is not available or is not numeric, throw JDODataStoreException.

  Returns:
    the current value

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Copyright © 2005-2011 Apache Software Foundation. All Rights Reserved.