public Class DefaultSequence

Create a new sequence with the name.

Create a new sequence with the name and sequence pre-allocation size.

Overrides org.eclipse.persistence.sequencing.Sequence.equals.

Doc from java.lang.Object.equals.

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters

obj:Object

the reference object with which to compare.

Returns:boolean

true if this object is the same as the obj argument; false otherwise.

Annotations

@Override

INTERNAL: Return the platform's default sequence.

Implements abstract org.eclipse.persistence.sequencing.Sequence.getGeneratedValue.

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).

Parameters

accessor:Accessor

Accessor is a separate sequencing accessor (may be null);

writeSession:AbstractSession

Session is a Session used for writing (either ClientSession or DatabaseSession);

seqName:String

String is sequencing number field name

Annotations

@Override

Implements abstract org.eclipse.persistence.sequencing.Sequence.getGeneratedVector.

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).

Parameters

accessor:Accessor

Accessor is a separate sequencing accessor (may be null);

writeSession:AbstractSession

Session is a Session used for writing (either ClientSession or DatabaseSession);

seqName:String

String is sequencing number field name

size:int

int number of values to preallocate (output Vector size).

Annotations

@Override

Overrides org.eclipse.persistence.sequencing.Sequence.getInitialValue.

Annotations

@Override

Overrides org.eclipse.persistence.sequencing.Sequence.getPreallocationSize.

Annotations

@Override

Overrides org.eclipse.persistence.sequencing.Sequence.hashCode.

Doc from java.lang.Object.hashCode.

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

Returns:int

a hash code value for this object.

Annotations

@Override

Overrides org.eclipse.persistence.sequencing.Sequence.isConnected.

PUBLIC: Indicates that Sequence is connected.

Annotations

@Override

Implements abstract org.eclipse.persistence.sequencing.Sequence.onConnect.

INTERNAL: This method is called when Sequencing object is created. It's a chance to do initialization.

Annotations

@Override

Implements abstract org.eclipse.persistence.sequencing.Sequence.onDisconnect.

INTERNAL: This method is called when Sequencing object is destroyed.. It's a chance to do deinitialization.

Annotations

@Override

Overrides org.eclipse.persistence.sequencing.Sequence.setQualifier.

INTERNAL: Ignored, getDefaultSequence().getQualifier() used instead.

Annotations

@Override

Implements abstract org.eclipse.persistence.sequencing.Sequence.shouldAcquireValueAfterInsert.

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.

Annotations

@Override

Overrides org.eclipse.persistence.sequencing.Sequence.shouldAlwaysOverrideExistingValue.

INTERNAL: Indicates whether the existing pk value should always be overridden by the sequence.

Annotations

@Override

Overrides org.eclipse.persistence.sequencing.Sequence.shouldUsePreallocation.

INTERNAL: Indicates whether several sequencing values should be acquired at a time and be kept by TopLink. This in only possible in case sequencing numbers should be acquired before insert (shouldAcquireValueAfterInsert()==false). In default implementation, it is true for table sequencing and native sequencing on Oracle platform, false for native sequencing on other platforms.

Annotations

@Override

Implements abstract org.eclipse.persistence.sequencing.Sequence.shouldUseTransaction.

INTERNAL: Indicates whether EclipseLink should internally call beginTransaction() before getGeneratedValue/Vector, and commitTransaction after. In default implementation, it is true for table sequencing and false for native sequencing.

Annotations

@Override