001: package com.quadcap.sql;
002:
003: /* Copyright 1999 - 2003 Quadcap Software. All rights reserved.
004: *
005: * This software is distributed under the Quadcap Free Software License.
006: * This software may be used or modified for any purpose, personal or
007: * commercial. Open Source redistributions are permitted. Commercial
008: * redistribution of larger works derived from, or works which bundle
009: * this software requires a "Commercial Redistribution License"; see
010: * http://www.quadcap.com/purchase.
011: *
012: * Redistributions qualify as "Open Source" under one of the following terms:
013: *
014: * Redistributions are made at no charge beyond the reasonable cost of
015: * materials and delivery.
016: *
017: * Redistributions are accompanied by a copy of the Source Code or by an
018: * irrevocable offer to provide a copy of the Source Code for up to three
019: * years at the cost of materials and delivery. Such redistributions
020: * must allow further use, modification, and redistribution of the Source
021: * Code under substantially the same terms as this license.
022: *
023: * Redistributions of source code must retain the copyright notices as they
024: * appear in each source code file, these license terms, and the
025: * disclaimer/limitation of liability set forth as paragraph 6 below.
026: *
027: * Redistributions in binary form must reproduce this Copyright Notice,
028: * these license terms, and the disclaimer/limitation of liability set
029: * forth as paragraph 6 below, in the documentation and/or other materials
030: * provided with the distribution.
031: *
032: * The Software is provided on an "AS IS" basis. No warranty is
033: * provided that the Software is free of defects, or fit for a
034: * particular purpose.
035: *
036: * Limitation of Liability. Quadcap Software shall not be liable
037: * for any damages suffered by the Licensee or any third party resulting
038: * from use of the Software.
039: */
040:
041: import java.io.Externalizable;
042: import java.io.IOException;
043: import java.io.ObjectInput;
044: import java.io.ObjectOutput;
045:
046: import java.sql.SQLException;
047:
048: import com.quadcap.sql.io.Extern;
049:
050: import com.quadcap.sql.file.BlockFile;
051: import com.quadcap.sql.file.Log;
052:
053: import com.quadcap.sql.types.Value;
054: import com.quadcap.sql.types.ValueBlob;
055:
056: import com.quadcap.util.Debug;
057:
058: /**
059: * Log step to insert a BLOB value into the database.
060: *
061: * @author Stan Bailes
062: */
063: public class RefcountBlob extends LogStep implements Externalizable {
064: long blob;
065: int incr;
066:
067: public RefcountBlob() {
068: }
069:
070: public RefcountBlob(Session session, long blob, int incr) {
071: super (session);
072: this .blob = blob;
073: this .incr = incr;
074: }
075:
076: public void redo(Session session) throws IOException, SQLException {
077: final Database db = session.getDatabase();
078: final long transId = session.getTransactionId();
079: if (session.getConnection().inRecovery()) {
080: blob = session.getLog().getRowMap(blob);
081: }
082: db.refCountBlob(transId, blob, incr);
083: }
084:
085: public void undo(Session session) throws IOException, SQLException {
086: final Database db = session.getDatabase();
087: final long transId = session.getTransactionId();
088: db.refCountBlob(transId, blob, (0 - incr));
089: }
090:
091: public void prepare(Session session) throws IOException {
092: }
093:
094: public void readExternal(ObjectInput in) throws IOException,
095: ClassNotFoundException {
096: super .readExternal(in);
097: blob = in.readLong();
098: incr = in.readInt();
099: }
100:
101: public void writeExternal(ObjectOutput out) throws IOException {
102: super .writeExternal(out);
103: out.writeLong(blob);
104: out.writeInt(incr);
105: }
106:
107: //#ifdef DEBUG
108: public String toString() {
109: StringBuffer sb = new StringBuffer(super .toString());
110: sb.append(" RefcountBlob(");
111: sb.append(Long.toString(blob));
112: sb.append(',');
113: sb.append(Integer.toString(incr));
114: sb.append(')');
115: return sb.toString();
116: }
117:
118: //#endif
119:
120: static Extern extern;
121:
122: public void setExtern(Extern extern) {
123: RefcountBlob.extern = extern;
124: }
125:
126: public Extern getExtern() {
127: return extern;
128: }
129: }
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