EclipseLink 2.2.0, build 'v20110202-r8913' API Reference

org.eclipse.persistence.sequencing
Class StandardSequence

java.lang.Object
  extended by org.eclipse.persistence.sequencing.Sequence
      extended by org.eclipse.persistence.sequencing.StandardSequence
All Implemented Interfaces:
java.io.Serializable, java.lang.Cloneable
Direct Known Subclasses:
QuerySequence

public abstract class StandardSequence
extends Sequence

Purpose: An abstract class providing default sequence behavior.

See Also:
Serialized Form

Field Summary
 
Fields inherited from class org.eclipse.persistence.sequencing.Sequence
depth, initialValue, isCustomQualifier, name, platform, qualifier, shouldAlwaysOverrideExistingValue, size
 
Constructor Summary
StandardSequence()
           
StandardSequence(java.lang.String name)
           
StandardSequence(java.lang.String name, int size)
           
StandardSequence(java.lang.String name, int size, int initialValue)
           
 
Method Summary
protected  java.util.Vector createVector(java.lang.Number sequence, java.lang.String seqName, int size)
          INTERNAL: given sequence = 10, size = 5 will create Vector (6,7,8,9,10)
 java.lang.Object getGeneratedValue(org.eclipse.persistence.internal.databaseaccess.Accessor accessor, org.eclipse.persistence.internal.sessions.AbstractSession writeSession, java.lang.String seqName)
          INTERNAL: Return the newly-generated sequencing value.
 java.util.Vector getGeneratedVector(org.eclipse.persistence.internal.databaseaccess.Accessor accessor, org.eclipse.persistence.internal.sessions.AbstractSession writeSession, java.lang.String seqName, int size)
          INTERNAL: Return a Vector of newly-generated sequencing values.
 void onConnect()
          INTERNAL: This method is called when Sequencing object is created.
 void onDisconnect()
          INTERNAL: This method is called when Sequencing object is destroyed.
 void setInitialValue(int initialValue)
           
abstract  boolean shouldAcquireValueAfterInsert()
          INTERNAL: Indicates whether sequencing value should be acquired after INSERT.
abstract  boolean shouldUseTransaction()
          INTERNAL: Indicates whether TopLink should internally call beginTransaction() before getGeneratedValue/Vector, and commitTransaction after.
protected abstract  java.lang.Number updateAndSelectSequence(org.eclipse.persistence.internal.databaseaccess.Accessor accessor, org.eclipse.persistence.internal.sessions.AbstractSession writeSession, java.lang.String seqName, int size)
           
 
Methods inherited from class org.eclipse.persistence.sequencing.Sequence
clone, equalNameAndSize, equals, getDatasourcePlatform, getGeneratedValue, getGeneratedVector, getInitialValue, getName, getPreallocationSize, getQualified, getQualifier, isConnected, isCustomQualifier, isNative, isTable, isUnaryTable, onConnect, onDisconnect, setDatasourcePlatform, setName, setPreallocationSize, setQualifier, setShouldAlwaysOverrideExistingValue, shouldAlwaysOverrideExistingValue, shouldAlwaysOverrideExistingValue, shouldUsePreallocation, toString, verifyPlatform
 
Methods inherited from class java.lang.Object
finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

StandardSequence

public StandardSequence()

StandardSequence

public StandardSequence(java.lang.String name)

StandardSequence

public StandardSequence(java.lang.String name,
                        int size)

StandardSequence

public StandardSequence(java.lang.String name,
                        int size,
                        int initialValue)
Method Detail

onConnect

public void onConnect()
Description copied from class: Sequence
INTERNAL: This method is called when Sequencing object is created. If it requires initialization, subclass should override this method.

Specified by:
onConnect in class Sequence

onDisconnect

public void onDisconnect()
Description copied from class: Sequence
INTERNAL: This method is called when Sequencing object is destroyed. If it requires deinitialization, subclass should override this method.

Specified by:
onDisconnect in class Sequence

updateAndSelectSequence

protected abstract java.lang.Number updateAndSelectSequence(org.eclipse.persistence.internal.databaseaccess.Accessor accessor,
                                                            org.eclipse.persistence.internal.sessions.AbstractSession writeSession,
                                                            java.lang.String seqName,
                                                            int size)

shouldAcquireValueAfterInsert

public abstract boolean shouldAcquireValueAfterInsert()
Description copied from class: Sequence
INTERNAL: Indicates whether sequencing value should be acquired after INSERT. Note that preallocation could be used only in case sequencing values should be acquired before insert (this method returns false). In default implementation, it is true for table sequencing and native sequencing on Oracle platform, false for native sequencing on other platforms.

Specified by:
shouldAcquireValueAfterInsert in class Sequence

shouldUseTransaction

public abstract boolean shouldUseTransaction()
Description copied from class: Sequence
INTERNAL: Indicates whether TopLink should internally call beginTransaction() before getGeneratedValue/Vector, and commitTransaction after. In default implementation, it is true for table sequencing and false for native sequencing.

Specified by:
shouldUseTransaction in class Sequence

getGeneratedValue

public java.lang.Object getGeneratedValue(org.eclipse.persistence.internal.databaseaccess.Accessor accessor,
                                          org.eclipse.persistence.internal.sessions.AbstractSession writeSession,
                                          java.lang.String seqName)
Description copied from class: Sequence
INTERNAL: Return the newly-generated sequencing value. Used only in case preallocation is not used (shouldUsePreallocation()==false). Accessor may be non-null only in case shouldUseSeparateConnection()==true. Even in this case accessor could be null - if SequencingControl().shouldUseSeparateConnection()==false; Therefore in case shouldUseSeparateConnection()==true, implementation should handle both cases: use a separate connection if provided (accessor != null), or get by without it (accessor == null).

Specified by:
getGeneratedValue in class Sequence
Parameters:
accessor - Accessor is a separate sequencing accessor (may be null);
writeSession - Session is a Session used for writing (either ClientSession or DatabaseSession);
seqName - String is sequencing number field name

getGeneratedVector

public java.util.Vector getGeneratedVector(org.eclipse.persistence.internal.databaseaccess.Accessor accessor,
                                           org.eclipse.persistence.internal.sessions.AbstractSession writeSession,
                                           java.lang.String seqName,
                                           int size)
Description copied from class: Sequence
INTERNAL: Return a Vector of newly-generated sequencing values. Used only in case preallocation is used (shouldUsePreallocation()==true). Accessor may be non-null only in case shouldUseSeparateConnection()==true. Even in this case accessor could be null - if SequencingControl().shouldUseSeparateConnection()==false; Therefore in case shouldUseSeparateConnection()==true, implementation should handle both cases: use a separate connection if provided (accessor != null), or get by without it (accessor == null).

Specified by:
getGeneratedVector in class Sequence
Parameters:
accessor - Accessor is a separate sequencing accessor (may be null);
writeSession - Session is a Session used for writing (either ClientSession or DatabaseSession);
seqName - String is sequencing number field name
size - int number of values to preallocate (output Vector size).

createVector

protected java.util.Vector createVector(java.lang.Number sequence,
                                        java.lang.String seqName,
                                        int size)
INTERNAL: given sequence = 10, size = 5 will create Vector (6,7,8,9,10)

Parameters:
seqName - String is sequencing number field name
size - int size of Vector to create.

setInitialValue

public void setInitialValue(int initialValue)
Overrides:
setInitialValue in class Sequence

EclipseLink 2.2.0, build 'v20110202-r8913' API Reference