oracle.toplink.essentials.tools.schemaframework.SequenceObjectDefinition Maven / Gradle / Ivy
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package oracle.toplink.essentials.tools.schemaframework;
import java.io.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.sequencing.Sequence;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
*
* Purpose: Sequence definition Native Sequence object.
*
*/
public class SequenceObjectDefinition extends SequenceDefinition {
/**
* INTERNAL:
* Should be a sequence defining sequence object in the db:
* either NativeSequence with shouldAcquireValueAfterInsert() returning false;
* or DefaultSequence (only if case platform.getDefaultSequence() is a
* NativeSequence with shouldAcquireValueAfterInsert() returning false).
*/
public SequenceObjectDefinition(Sequence sequence) {
super(sequence);
}
/**
* INTERNAL:
* Return the SQL required to create the Oracle sequence object.
*/
public Writer buildCreationWriter(AbstractSession session, Writer writer) {
try {
// startWith value calculated using the initial value and increment.
// The first time TopLink calls select nextval, the value equal to startWith is returned.
// The first sequence value TopLink may assign is startWith - getIncrement() + 1.
int startWith = sequence.getInitialValue() + sequence.getPreallocationSize() - 1;
session.getPlatform().buildSequenceObjectCreationWriter(writer, getFullName(), sequence.getPreallocationSize(), startWith);
} catch (IOException ioException) {
throw ValidationException.fileError(ioException);
}
return writer;
}
/**
* INTERNAL:
* Return the SQL required to drop the Oracle sequence object.
*/
public Writer buildDeletionWriter(AbstractSession session, Writer writer) {
try {
session.getPlatform().buildSequenceObjectDeletionWriter(writer, getFullName());
} catch (IOException ioException) {
throw ValidationException.fileError(ioException);
}
return writer;
}
/**
* INTERNAL:
* Return the SQL required to alter INCREMENT BY
*/
public Writer buildAlterIncrementWriter(AbstractSession session, Writer writer) {
try {
session.getPlatform().buildSequenceObjectAlterIncrementWriter(writer, getFullName(), sequence.getPreallocationSize());
} catch (IOException ioException) {
throw ValidationException.fileError(ioException);
}
return writer;
}
/**
* INTERNAL:
* Check if the sequence object already exists, in which case dont create it.
*/
public boolean checkIfExist(AbstractSession session) throws DatabaseException {
boolean isConnected = sequence.isConnected();
// temporary connect sequence if it's not connected.
if(!isConnected) {
sequence.onConnect(session.getPlatform());
}
try {
if(sequence.shouldUsePreallocation()) {
sequence.getGeneratedVector(null, session);
} else {
sequence.getGeneratedValue(null, session);
}
return true;
} catch (DatabaseException databaseException) {
return false;
} catch (ValidationException validationException) {
// This exception indicates that the current preallocationSize
// is greater than the returned value.
// It should be ignored because sequence actually exists in the db.
if(validationException.getErrorCode() == ValidationException.SEQUENCE_SETUP_INCORRECTLY) {
return true;
} else {
throw validationException;
}
} finally {
if(!isConnected) {
sequence.onDisconnect(session.getPlatform());
}
}
}
/**
* INTERNAL:
* Indicates whether alterIncrement is supported
*/
public boolean isAlterSupported(AbstractSession session) {
return session.getPlatform().isAlterSequenceObjectSupported();
}
/**
* INTERNAL:
* Execute the SQL required to alter sequence increment.
* Assume that the sequence exists.
*/
public void alterOnDatabase(AbstractSession session) throws TopLinkException {
try {
session.executeNonSelectingCall(new oracle.toplink.essentials.queryframework.SQLCall(buildAlterIncrementWriter(session, new StringWriter()).toString()));
} catch (DatabaseException exception) {
createOnDatabase(session);
}
}
/**
* INTERNAL:
* Execute the SQL required to alter sequence increment.
* Assume that the sequence exists.
*/
public void alterIncrement(AbstractSession session, Writer schemaWriter) throws ValidationException {
if (schemaWriter == null) {
this.alterOnDatabase(session);
} else {
this.buildAlterIncrementWriter(session, schemaWriter);
}
}
}