/* Copyright (c) 2001-2008, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
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* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
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* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.hsqldb;
import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.lib.HashMappedList;
import org.hsqldb.persist.Logger;
/**
* Manages SEQUENCE objects for a Database instance. <p>
*
* @author fredt@users
* @version 1.7.2
* @since 1.7.2
*/
public class SequenceManager {
HashMappedList sequenceMap;
SequenceManager() {
sequenceMap = new HashMappedList();
}
/**
* Drops a sequence with the specified name from this Database
*
* @param name of the sequence to drop
* @throws HsqlException if a database access error occurs
*/
void dropSequence(String name) throws HsqlException {
boolean found = sequenceMap.containsKey(name);
Trace.check(found, Trace.SEQUENCE_NOT_FOUND, name);
sequenceMap.remove(name);
}
public NumberSequence getSequence(String name) {
return (NumberSequence) sequenceMap.get(name);
}
NumberSequence createSequence(HsqlName hsqlname, long start,
long increment,
int type) throws HsqlException {
Trace.check(!sequenceMap.containsKey(hsqlname.name),
Trace.SEQUENCE_ALREADY_EXISTS);
NumberSequence sequence = new NumberSequence(hsqlname, start,
increment, type);
sequenceMap.put(hsqlname.name, sequence);
return sequence;
}
String logSequences(Session c, Logger logger) throws HsqlException {
for (int i = 0; i < sequenceMap.size(); i++) {
NumberSequence seq = (NumberSequence) sequenceMap.get(i);
if (seq.wasUsed()) {
logger.writeSequenceStatement(c, seq);
seq.resetWasUsed();
}
}
return null;
}
}