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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2013 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * Copyright (c) 2012 The Chromium Authors. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions are
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10 * met:
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11 *
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12 * * Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * * Redistributions in binary form must reproduce the above
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15 * copyright notice, this list of conditions and the following disclaimer
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16 * in the documentation and/or other materials provided with the
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17 * distribution.
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18 * * Neither the name of Google Inc., the name of the CHU of Liege,
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19 * nor the names of its contributors may be used to endorse or promote
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20 * products derived from this software without specific prior written
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21 * permission.
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22 *
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23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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27 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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29 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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34 **/
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35
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36
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37 #include "StatementReference.h"
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38
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39 #include "../OrthancException.h"
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40
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41 #include <cassert>
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42 #include <glog/logging.h>
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43 #include "sqlite3.h"
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44
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45 namespace Orthanc
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46 {
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47 namespace SQLite
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48 {
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49 bool StatementReference::IsRoot() const
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50 {
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51 return root_ == NULL;
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52 }
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53
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54 StatementReference::StatementReference()
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55 {
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56 root_ = NULL;
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57 refCount_ = 0;
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58 statement_ = NULL;
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59 assert(IsRoot());
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60 }
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61
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62 StatementReference::StatementReference(sqlite3* database,
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63 const char* sql)
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64 {
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65 if (database == NULL || sql == NULL)
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66 {
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67 throw OrthancException(ErrorCode_ParameterOutOfRange);
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68 }
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69
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70 root_ = NULL;
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71 refCount_ = 0;
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72
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73 int error = sqlite3_prepare_v2(database, sql, -1, &statement_, NULL);
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74 if (error != SQLITE_OK)
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75 {
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76 throw OrthancException("SQLite: " + std::string(sqlite3_errmsg(database)));
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77 }
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78
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79 assert(IsRoot());
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80 }
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81
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82 StatementReference::StatementReference(StatementReference& other)
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83 {
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84 refCount_ = 0;
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85
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86 if (other.IsRoot())
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87 {
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88 root_ = &other;
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89 }
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90 else
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91 {
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92 root_ = other.root_;
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93 }
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94
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95 root_->refCount_++;
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96 statement_ = root_->statement_;
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97
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98 assert(!IsRoot());
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99 }
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100
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101 StatementReference::~StatementReference()
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102 {
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103 if (IsRoot())
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104 {
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105 if (refCount_ != 0)
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106 {
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107 // There remain references to this object. We cannot throw
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108 // an exception because:
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109 // http://www.parashift.com/c++-faq/dtors-shouldnt-throw.html
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110
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111 LOG(ERROR) << "Bad value of the reference counter";
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112 }
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113 else if (statement_ != NULL)
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114 {
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115 sqlite3_finalize(statement_);
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116 }
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117 }
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118 else
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119 {
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120 if (root_->refCount_ == 0)
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121 {
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122 throw OrthancException(ErrorCode_InternalError);
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123 }
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124 else
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125 {
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126 root_->refCount_--;
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127 }
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128 }
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129 }
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130
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131 uint32_t StatementReference::GetReferenceCount() const
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132 {
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133 return refCount_;
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134 }
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135 }
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136 }
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