StoredContainer (Oracle - Berkeley DB Java Edition API)

java.lang.Object
- com.sleepycat.collections.StoredContainer

All Implemented Interfaces:

java.lang.Cloneable

Direct Known Subclasses:

StoredCollection, StoredMap
```
public abstract class StoredContainer
extends java.lang.Object
implements java.lang.Cloneable
```
A abstract base class for all stored collections and maps. This class provides implementations of methods that are common to the Collection and the Map interfaces, namely clear(), isEmpty() and size().
In addition, this class provides the following methods for stored collections only. Note that the use of these methods is not compatible with the standard Java collections interface.
Author:

Mark Hayes

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`areDuplicatesAllowed()` Returns whether duplicate keys are allowed in this container.
`boolean`	`areDuplicatesOrdered()` Returns whether duplicate keys are allowed and sorted by element value.
`boolean`	`areKeyRangesAllowed()` Returns whether key ranges are allowed in this container.
`boolean`	`areKeysRenumbered()` Returns whether keys are renumbered when insertions and deletions occur.
`void`	`clear()` Removes all mappings or elements from this map or collection (optional operation).
`CursorConfig`	`getCursorConfig()` Returns the cursor configuration that is used for all operations performed via this container.
`boolean`	`isEmpty()` Returns true if this map or collection contains no mappings or elements.
`boolean`	`isOrdered()` Returns whether keys are ordered in this container.
`boolean`	`isSecondary()` Returns whether this container is a view on a secondary database rather than directly on a primary database.
`boolean`	`isTransactional()` Returns whether the databases underlying this container are transactional.
`boolean`	`isWriteAllowed()` Returns true if this is a read-write container or false if this is a read-only container.
`abstract int`	`size()` Returns a non-transactional count of the records in the collection or map.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - isWriteAllowed
```
public final boolean isWriteAllowed()
```
    Returns true if this is a read-write container or false if this is a read-only container. This method does not exist in the standard Map or Collection interfaces.
    
    Returns:
    
    whether write is allowed.
  - getCursorConfig
```
public final CursorConfig getCursorConfig()
```
    Returns the cursor configuration that is used for all operations performed via this container. For example, if CursorConfig.getReadUncommitted returns true, data will be read that is modified but not committed. This method does not exist in the standard Map or Collection interfaces.
    
    Returns:
    
    the cursor configuration, or null if no configuration has been specified.
  - isTransactional
```
public final boolean isTransactional()
```
    Returns whether the databases underlying this container are transactional. Even in a transactional environment, a database will be transactional only if it was opened within a transaction or if the auto-commit option was specified when it was opened. This method does not exist in the standard Map or Collection interfaces.
    
    Returns:
    
    whether the database is transactional.
  - areDuplicatesAllowed
```
public final boolean areDuplicatesAllowed()
```
    Returns whether duplicate keys are allowed in this container. Duplicates are optionally allowed for HASH and BTREE databases. This method does not exist in the standard Map or Collection interfaces.
    Note that the JE product only supports BTREE databases.
    
    Returns:
    
    whether duplicates are allowed.
  - areDuplicatesOrdered
```
public final boolean areDuplicatesOrdered()
```
    Returns whether duplicate keys are allowed and sorted by element value. Duplicates are optionally sorted for HASH and BTREE databases. This method does not exist in the standard Map or Collection interfaces.
    Note that the JE product only supports BTREE databases, and duplicates are always sorted.
    
    Returns:
    
    whether duplicates are ordered.
  - areKeysRenumbered
```
public final boolean areKeysRenumbered()
```
    Returns whether keys are renumbered when insertions and deletions occur. Keys are optionally renumbered for RECNO databases. This method does not exist in the standard Map or Collection interfaces.
    Note that the JE product does not support RECNO databases, and therefore keys are never renumbered.
    
    Returns:
    
    whether keys are renumbered.
  - isOrdered
```
public final boolean isOrdered()
```
    Returns whether keys are ordered in this container. Keys are ordered for BTREE, RECNO and QUEUE databases. This method does not exist in the standard Map or Collection interfaces.
    Note that the JE product only support BTREE databases, and therefore keys are always ordered.
    
    Returns:
    
    whether keys are ordered.
  - areKeyRangesAllowed
```
public final boolean areKeyRangesAllowed()
```
    Returns whether key ranges are allowed in this container. Key ranges are allowed only for BTREE databases. This method does not exist in the standard Map or Collection interfaces.
    Note that the JE product only supports BTREE databases, and therefore key ranges are always allowed.
    
    Returns:
    
    whether keys are ordered.
  - isSecondary
```
public final boolean isSecondary()
```
    Returns whether this container is a view on a secondary database rather than directly on a primary database. This method does not exist in the standard Map or Collection interfaces.
    
    Returns:
    
    whether the view is for a secondary database.
  - size
```
public abstract int size()
```
    Returns a non-transactional count of the records in the collection or map. This method conforms to the Collection.size() and Map.size() interfaces.
    This operation is faster than obtaining a count by scanning the collection manually, and will not perturb the current contents of the cache. However, the count is not guaranteed to be accurate if there are concurrent updates.
    
    Returns:
    
    the number of records.
    
    Throws:
    
    OperationFailureException - if one of the Read Operation Failures occurs.
    
    EnvironmentFailureException - if an unexpected, internal or environment-wide failure occurs.
    
    RuntimeExceptionWrapper - if a checked exception is thrown, including a DatabaseException on BDB (C edition).
  - isEmpty
```
public boolean isEmpty()
```
    Returns true if this map or collection contains no mappings or elements. This method conforms to the Collection.isEmpty() and Map.isEmpty() interfaces.
    
    Returns:
    
    whether the container is empty.
    
    Throws:
    
    OperationFailureException - if one of the Read Operation Failures occurs.
    
    EnvironmentFailureException - if an unexpected, internal or environment-wide failure occurs.
    
    RuntimeExceptionWrapper - if a checked exception is thrown, including a DatabaseException on BDB (C edition).
  - clear
```
public void clear()
```
    Removes all mappings or elements from this map or collection (optional operation). This method conforms to the Collection.clear() and Map.clear() interfaces.
    
    Throws:
    
    OperationFailureException - if one of the Write Operation Failures occurs.
    
    EnvironmentFailureException - if an unexpected, internal or environment-wide failure occurs.
    
    java.lang.UnsupportedOperationException - if the container is read-only.
    
    RuntimeExceptionWrapper - if a checked exception is thrown, including a DatabaseException on BDB (C edition).

Class StoredContainer

Method Summary

Methods inherited from class java.lang.Object

Method Detail

isWriteAllowed

getCursorConfig

isTransactional

areDuplicatesAllowed

areDuplicatesOrdered

areKeysRenumbered

isOrdered

areKeyRangesAllowed

isSecondary

size

isEmpty

clear