svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.db / org.gvsig.fmap.dal.db.lib / src / main / java / org / gvsig / fmap / dal / resource / db / AbstractDBResourceBlocker.java @ 40435
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1 | 40435 | jjdelcerro | /* gvSIG. Geographic Information System of the Valencian Government
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2 | *
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3 | * Copyright (C) 2007-2008 Infrastructures and Transports Department
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4 | * of the Valencian Government (CIT)
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5 | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | * as published by the Free Software Foundation; either version 2
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9 | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | * MA 02110-1301, USA.
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20 | *
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21 | */
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22 | |||
23 | /*
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24 | * AUTHORS (In addition to CIT):
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25 | * 2009 IVER T.I {{Task}}
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26 | */
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27 | |||
28 | package org.gvsig.fmap.dal.resource.db; |
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29 | |||
30 | import org.gvsig.fmap.dal.exception.DataException; |
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31 | import org.gvsig.fmap.dal.exception.InitializeException; |
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32 | import org.gvsig.fmap.dal.resource.ResourceParameters; |
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33 | import org.gvsig.fmap.dal.resource.exception.AccessResourceException; |
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34 | import org.gvsig.fmap.dal.resource.exception.ResourceException; |
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35 | import org.gvsig.fmap.dal.resource.spi.AbstractResource; |
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36 | |||
37 | /**
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38 | * Abstract Data Base Resource implementation that prevents the concurrent
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39 | * access.
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40 | *
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41 | * @author jmvivo
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42 | *
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43 | */
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44 | public abstract class AbstractDBResourceBlocker extends AbstractResource |
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45 | implements
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46 | DBResource { |
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47 | |||
48 | /**
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49 | * Default constructor
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50 | *
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51 | * @param parameters
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52 | * @throws InitializeException
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53 | */
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54 | protected AbstractDBResourceBlocker(DBResourceParameters parameters)
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55 | throws InitializeException {
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56 | super(parameters);
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57 | } |
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58 | |||
59 | |||
60 | /**
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61 | * Return a connection to the data base.<br>
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62 | * Connect to the Data Base if is needed
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63 | *
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64 | * @return connection to the data base
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65 | */
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66 | public Object get() throws AccessResourceException { |
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67 | if (!isConnected()) {
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68 | try {
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69 | this.connect();
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70 | } catch (DataException e) {
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71 | throw new AccessResourceException(this, e); |
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72 | } |
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73 | } |
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74 | try {
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75 | return getTheConnection();
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76 | } catch (DataException e) {
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77 | throw new AccessResourceException(this, e); |
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78 | } |
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79 | } |
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80 | |||
81 | /**
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82 | * Return a connection to the data base.<br>
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83 | * Connect to the Data Base if is needed
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84 | *
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85 | *
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86 | * @return connection to the data base
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87 | * @see #get()
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88 | */
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89 | public Object getConnection() throws AccessResourceException { |
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90 | return get();
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91 | } |
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92 | |||
93 | /**
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94 | * Establish connection to data base
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95 | *
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96 | * @throws DataException
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97 | */
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98 | public final void connect() throws DataException { |
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99 | if (this.isConnected()) { |
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100 | return;
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101 | } |
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102 | prepare(); |
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103 | connectToDB(); |
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104 | } |
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105 | |||
106 | /**
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107 | * Check if parameters is the same for this resource.<br>
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108 | * <br>
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109 | *
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110 | * <strong>Note:</strong> override this method to add checks for specify
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111 | * final implementation parameters
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112 | *
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113 | *
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114 | * @see AbstractResource#isThis(ResourceParameters)
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115 | */
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116 | public boolean isThis(ResourceParameters parameters) |
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117 | throws ResourceException {
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118 | if (!(parameters instanceof DBResourceParameters)) { |
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119 | return false; |
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120 | } |
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121 | DBResourceParameters params = (DBResourceParameters) parameters |
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122 | .getCopy(); |
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123 | prepare(params); |
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124 | DBResourceParameters myParams = (DBResourceParameters) this
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125 | .getParameters(); |
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126 | |||
127 | if (!equals(myParams.getHost(), params.getHost())) {
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128 | return false; |
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129 | } |
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130 | if (!equals(myParams.getPort(), params.getPort())) {
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131 | return false; |
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132 | } |
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133 | if (!equals(myParams.getUser(), params.getUser())) {
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134 | return false; |
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135 | } |
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136 | |||
137 | return true; |
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138 | } |
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139 | |||
140 | @SuppressWarnings("unchecked") |
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141 | protected boolean equals(Comparable v1, Comparable v2) { |
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142 | if (v1 == v2) {
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143 | return true; |
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144 | } |
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145 | if ((v1 != null) && (v2 != null)) { |
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146 | return v1.compareTo(v2) == 0; |
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147 | } |
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148 | return false; |
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149 | } |
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150 | |||
151 | /**
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152 | * final implementation method to Establish connection to data base<br>
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153 | * Called from {@link #get()}<br>
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154 | * <br>
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155 | *
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156 | *
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157 | * @throws DataException
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158 | */
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159 | protected abstract void connectToDB() throws DataException; |
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160 | |||
161 | /**
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162 | * final implementation method to get a connection to data base<br>
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163 | * Called from {@link #connect()}<br>
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164 | * <br>
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165 | * This method is called with the connection establish
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166 | *
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167 | * @throws DataException
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168 | */
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169 | protected abstract Object getTheConnection() throws DataException; |
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170 | |||
171 | } |