01: /* Copyright (c) 2001-2005, The HSQL Development Group
02: * All rights reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, are permitted provided that the following conditions are met:
06: *
07: * Redistributions of source code must retain the above copyright notice, this
08: * list of conditions and the following disclaimer.
09: *
10: * Redistributions in binary form must reproduce the above copyright notice,
11: * this list of conditions and the following disclaimer in the documentation
12: * and/or other materials provided with the distribution.
13: *
14: * Neither the name of the HSQL Development Group nor the names of its
15: * contributors may be used to endorse or promote products derived from this
16: * software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
22: * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25: * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
26: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28: * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: */
30:
31: package org.hsqldb;
32:
33: import org.hsqldb.HsqlNameManager.HsqlName;
34: import org.hsqldb.lib.HashMappedList;
35: import org.hsqldb.persist.Logger;
36:
37: /**
38: * Manages SEQUENCE objects for a Database instance. <p>
39: *
40: * @author fredt@users
41: * @version 1.7.2
42: * @since 1.7.2
43: */
44: public class SequenceManager {
45:
46: HashMappedList sequenceMap;
47:
48: SequenceManager() {
49: sequenceMap = new HashMappedList();
50: }
51:
52: /**
53: * Drops a sequence with the specified name from this Database
54: *
55: * @param name of the sequence to drop
56: * @throws HsqlException if a database access error occurs
57: */
58: void dropSequence(String name) throws HsqlException {
59:
60: boolean found = sequenceMap.containsKey(name);
61:
62: Trace.check(found, Trace.SEQUENCE_NOT_FOUND, name);
63: sequenceMap.remove(name);
64: }
65:
66: public NumberSequence getSequence(String name) {
67: return (NumberSequence) sequenceMap.get(name);
68: }
69:
70: NumberSequence createSequence(HsqlName hsqlname, long start,
71: long increment, int type) throws HsqlException {
72:
73: Trace.check(!sequenceMap.containsKey(hsqlname.name),
74: Trace.SEQUENCE_ALREADY_EXISTS);
75:
76: NumberSequence sequence = new NumberSequence(hsqlname, start,
77: increment, type);
78:
79: sequenceMap.put(hsqlname.name, sequence);
80:
81: return sequence;
82: }
83:
84: String logSequences(Session c, Logger logger) throws HsqlException {
85:
86: for (int i = 0; i < sequenceMap.size(); i++) {
87: NumberSequence seq = (NumberSequence) sequenceMap.get(i);
88:
89: if (seq.wasUsed()) {
90: logger.writeSequenceStatement(c, seq);
91: seq.resetWasUsed();
92: }
93: }
94:
95: return null;
96: }
97: }
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