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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/state/AbstractState.java @ 168:f70977cf2faf

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Avoid Nullpointer exception in listCollections() when no creation time of the collection is returned. artifacts/trunk@1393 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 04 Mar 2011 09:13:18 +0000
parents ece0fdb07975
children 2a9591f76270
rev   line source
105
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1 /*
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2 * Copyright (c) 2011 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8 package de.intevation.artifactdatabase.state;
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9
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10 import java.util.HashMap;
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11 import java.util.Map;
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12
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13 import javax.xml.xpath.XPathConstants;
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14
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15 import org.w3c.dom.Document;
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16 import org.w3c.dom.Node;
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17
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18 import de.intevation.artifacts.CallContext;
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19
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20 import de.intevation.artifacts.common.utils.XMLUtils;
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21
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22 import de.intevation.artifactdatabase.data.StateData;
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23
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24
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25 /**
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26 * An abstract implementation of a {@link State}. It implements some basic
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27 * methods that return the id, description and data. The methods
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28 * <code>describe()</code> and <code>setup()</code> depend on the concrete class
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29 * and need to be implemented by those.
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30 */
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31 public abstract class AbstractState implements State {
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32
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33 /** The XPath to the ID of the state relative to the state node in the
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34 * configuration. */
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35 public static final String XPATH_ID = "@id";
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36
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37 /** The XPath to the description of the state relative to the state node in
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38 * the configuration. */
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39 public static final String XPATH_DESCRIPTION = "@description";
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40
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41
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42 /** The ID of the state. */
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43 protected String id;
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44
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45 /** The description of the state. */
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46 protected String description;
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47
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48 /** The data provided by this state. */
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49 protected Map<String, StateData> data;
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50
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51
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52 /**
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53 * The default constructor.
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54 *
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55 * @param id The ID of the state.
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56 * @param description The description of the state.
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57 */
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58 public AbstractState(String id, String description) {
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59 this.id = id;
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60 this.description = description;
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61 }
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62
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63
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64 /**
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65 * Returns the ID of the state.
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66 *
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67 * @return the ID of the state.
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68 */
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69 public String getID() {
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70 return id;
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71 }
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72
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73
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74 /**
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75 * Set the ID of the state.
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76 *
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77 * @param id The ID of the state.
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78 */
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79 public void setID(String id) {
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80 this.id = id;
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81 }
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82
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83
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84 /**
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85 * Returns the description of the state.
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86 *
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87 * @return the description of the state.
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88 */
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89 public String getDescription() {
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90 return description;
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91 }
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92
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93
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94 /**
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95 * Set the description of the state.
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96 *
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97 * @param description The description of the state.
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98 */
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99 public void setDescription(String description) {
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100 this.description = description;
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101 }
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102
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103
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104 /**
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105 * Returns the data of the state.
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106 *
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107 * @return the data of the state.
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108 */
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109 public Map<String, StateData> getData() {
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110 return data;
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111 }
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112
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113
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114 /**
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115 * Add new data to the state. NOTE: If there is already an object existing
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116 * with the key <i>name</i>, this object is overwritten by the new value.
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117 *
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118 * @param name The name of the data object.
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119 * @param StateData The data object.
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120 */
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121 public void addData(String name, StateData data) {
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122 if (this.data == null) {
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123 this.data = new HashMap<String, StateData>();
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124 }
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125
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126 this.data.put(name, data);
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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 * Initialize the state based on the state node in the configuration.
105
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132 *
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133 * @param config The state configuration node.
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134 */
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135 public void setup(Node config) {
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136 id = (String) XMLUtils.xpath(config, XPATH_ID, XPathConstants.STRING);
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137
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138 description = (String) XMLUtils.xpath(
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139 config, XPATH_DESCRIPTION, XPathConstants.STRING);
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140 }
105
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141
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142
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143 /**
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144 * Describes the UI of the state. This method needs to be implemented by
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145 * concrete subclasses.
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146 *
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147 * @param document Describe doucment.
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148 * @param rootNode Parent node for all new elements.
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149 * @param context The CallContext.
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150 * @param uuid The uuid of an artifact.
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151 */
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152 public abstract void describe(
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153 Document document,
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154 Node rootNode,
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155 CallContext context,
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156 String uuid
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157 );
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158 }
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159 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org