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/*
* Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
// 09/14/2017-2.6 Will Dazey
// - 522312: Add the eclipselink.sequencing.start-sequence-at-nextval property
package org.eclipse.persistence.sequencing;
import java.util.Vector;
import org.eclipse.persistence.internal.databaseaccess.Accessor;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.exceptions.ValidationException;
import org.eclipse.persistence.exceptions.DatabaseException;
/**
* <p>
* <b>Purpose</b>: An abstract class providing default sequence behavior.
* </p>
*/
public abstract class StandardSequence extends Sequence {
public StandardSequence() {
super();
}
public StandardSequence(String name) {
super(name);
}
public StandardSequence(String name, int size) {
super(name, size);
}
public StandardSequence(String name, int size, int initialValue) {
super(name, size, initialValue);
}
public void onConnect() {
// does nothing
}
public void onDisconnect() {
// does nothing
}
protected abstract Number updateAndSelectSequence(Accessor accessor, AbstractSession writeSession, String seqName, int size);
public abstract boolean shouldAcquireValueAfterInsert();
public abstract boolean shouldUseTransaction();
public Object getGeneratedValue(Accessor accessor, AbstractSession writeSession, String seqName) {
if (shouldUsePreallocation()) {
return null;
} else {
Number value = updateAndSelectSequence(accessor, writeSession, seqName, 1);
if (value == null) {
throw DatabaseException.errorPreallocatingSequenceNumbers();
}
return value;
}
}
public Vector getGeneratedVector(Accessor accessor, AbstractSession writeSession, String seqName, int size) {
if (shouldUsePreallocation()) {
Number value = updateAndSelectSequence(accessor, writeSession, seqName, size);
if (value == null) {
throw DatabaseException.errorPreallocatingSequenceNumbers();
}
if(writeSession.getPlatform().getDefaultSeqenceAtNextValue()) {
return createVectorAtNextVal(value, seqName, size);
}
return createVector(value, seqName, size);
} else {
return null;
}
}
/**
* INTERNAL:
* given sequence = 10, size = 5 will create Vector (6,7,8,9,10)
* @param seqName String is sequencing number field name
* @param size int size of Vector to create.
*/
protected Vector createVector(Number sequence, String seqName, int size) {
long nextSequence = sequence.longValue();
Vector sequencesForName = new Vector(size);
nextSequence = nextSequence - size;
// Check for incorrect values return to validate that the sequence is setup correctly.
// PRS 36451 intvalue would wrap
if (nextSequence < -1L) {
throw ValidationException.sequenceSetupIncorrectly(seqName);
}
for (int index = size; index > 0; index--) {
nextSequence = nextSequence + 1L;
sequencesForName.add(nextSequence);
}
return sequencesForName;
}
/**
* INTERNAL:
* given sequence = 10, size = 5 will create Vector (10,11,12,13,14)
* @param seqName String is sequencing number field name
* @param size int size of Vector to create.
*/
protected Vector createVectorAtNextVal(Number sequence, String seqName, int size) {
long nextSequence = sequence.longValue();
Vector sequencesForName = new Vector(size);
// Check for incorrect values return to validate that the sequence is setup correctly.
// PRS 36451 intvalue would wrap
if (nextSequence < -1L) {
throw ValidationException.sequenceSetupIncorrectly(seqName);
}
for (int index = size; index > 0; index--) {
sequencesForName.add(nextSequence);
nextSequence = nextSequence + 1L;
}
return sequencesForName;
}
public void setInitialValue(int initialValue) {
// sequence value should be positive
if (initialValue <= 0) {
initialValue = 1;
}
super.setInitialValue(initialValue);
}
}
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