Mercurial > dive4elements > framework

annotate artifact-database/src/main/java/de/intevation/artifactdatabase/state/AbstractState.java @ 310:63122b9dee1d

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Added interface to listen events in the backend. artifacts/trunk@2435 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 01 Aug 2011 09:41:40 +0000
parents 995fa6994480
children 8a3ddd374dd1
rev   line source
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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.ArrayList;
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11 import java.util.HashMap;
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12 import java.util.List;
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13 import java.util.Map;
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15 import javax.xml.xpath.XPathConstants;
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16
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17 import org.apache.log4j.Logger;
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18
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19 import org.w3c.dom.Document;
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20 import org.w3c.dom.Element;
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21 import org.w3c.dom.Node;
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22 import org.w3c.dom.NodeList;
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23
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24 import de.intevation.artifacts.Artifact;
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25 import de.intevation.artifacts.ArtifactNamespaceContext;
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26 import de.intevation.artifacts.CallContext;
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27
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28 import de.intevation.artifacts.common.utils.XMLUtils;
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29
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30 import de.intevation.artifactdatabase.data.StateData;
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32
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33 /**
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34 * An abstract implementation of a {@link State}. It implements some basic
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35 * methods that return the id, description and data. The methods
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36 * <code>describe()</code> and <code>setup()</code> depend on the concrete class
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37 * and need to be implemented by those.
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38 */
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39 public abstract class AbstractState implements State {
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40
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41 /** The XPath to the ID of the state relative to the state node in the
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42 * configuration. */
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43 public static final String XPATH_ID = "@id";
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44
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45 /** The XPath to the description of the state relative to the state node in
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46 * the configuration. */
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47 public static final String XPATH_DESCRIPTION = "@description";
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49 /** The XPath to the output nodes of the state configuration.*/
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50 public static final String XPATH_OUTPUT_MODES = "outputmodes/outputmode";
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52 /** The XPath to the list of facets relative to the output mode it belongs
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53 * to.*/
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54 public static final String XPATH_FACETS = "facets/facet";
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55
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56
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57 /** The logger that is used in this class.*/
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58 private static Logger logger = Logger.getLogger(AbstractState.class);
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61 /** The ID of the state. */
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62 protected String id;
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63
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64 /** The description of the state. */
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65 protected String description;
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66
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67 /** The data provided by this state. */
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68 protected Map<String, StateData> data;
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69
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70 /** A list of output modes which are available for this state.*/
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71 protected List<Output> outputs;
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74 public AbstractState() {
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75 outputs = new ArrayList<Output>();
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76 }
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79 /**
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80 * The default constructor.
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81 *
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82 * @param id The ID of the state.
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83 * @param description The description of the state.
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84 */
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85 public AbstractState(String id, String description) {
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86 super();
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88 this.id = id;
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89 this.description = description;
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91 }
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93
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94 /**
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95 * Returns the ID of the state.
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96 *
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97 * @return the ID of the state.
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98 */
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99 public String getID() {
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100 return id;
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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 * Set the ID of the state.
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106 *
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107 * @param id The ID of the state.
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108 */
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109 public void setID(String id) {
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110 this.id = id;
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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 * Returns the description of the state.
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116 *
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117 * @return the description of the state.
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118 */
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119 public String getDescription() {
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120 return description;
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121 }
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122
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123
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124 /**
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125 * Set the description of the state.
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126 *
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127 * @param description The description of the state.
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128 */
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129 public void setDescription(String description) {
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130 this.description = description;
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131 }
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132
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133
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134 /**
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135 * Returns the data of the state.
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136 *
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137 * @return the data of the state.
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138 */
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139 public Map<String, StateData> getData() {
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140 return data;
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141 }
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142
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143
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144 /**
256
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145 * Returns a specific data object of the state.
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146 *
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147 * @param name The name of the data object.
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148 *
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149 * @return a data object of the state or null if no such data object exists.
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150 */
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151 public StateData getData(String name) {
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152 return data.get(name);
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153 }
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154
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155
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156 /**
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157 * Add new data to the state. NOTE: If there is already an object existing
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158 * with the key <i>name</i>, this object is overwritten by the new value.
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159 *
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160 * @param name The name of the data object.
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161 * @param StateData The data object.
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162 */
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163 public void addData(String name, StateData data) {
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164 if (this.data == null) {
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165 this.data = new HashMap<String, StateData>();
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166 }
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167
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168 this.data.put(name, data);
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169 }
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170
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171
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172 /**
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173 * Returns the list of possible outputs of this state. The list is empty
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174 * if no output is available for this state.
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175 *
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176 * @return a list of possible outputs of this state.
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177 */
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178 public List<Output> getOutputs() {
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179 return outputs;
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180 }
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181
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182
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183 /**
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184 * Initialize the state based on the state node in the configuration.
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185 *
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186 * @param config The state configuration node.
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187 */
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188 public void setup(Node config) {
226
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189 logger.info("AbstractState.setup");
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190
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191 id = (String) XMLUtils.xpath(config, XPATH_ID, XPathConstants.STRING);
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192
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193 description = (String) XMLUtils.xpath(
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194 config, XPATH_DESCRIPTION, XPathConstants.STRING);
209
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195
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196 setupOutputs(config);
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197 }
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198
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199
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200 /**
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201 * This method tries reading the available output nodes configured in the
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202 * state configuration and adds possible Outputs to the outputs list.
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203 *
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204 * @param config The state configuration node.
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205 */
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206 protected void setupOutputs(Node config) {
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207 NodeList outs = (NodeList) XMLUtils.xpath(
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208 config,
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209 XPATH_OUTPUT_MODES,
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210 XPathConstants.NODESET,
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211 ArtifactNamespaceContext.INSTANCE);
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212
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213 if (outs == null || outs.getLength() == 0) {
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214 return;
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215 }
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216
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217 int size = outs.getLength();
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218
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219 for (int i = 0; i < size; i++) {
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220 outputs.add(buildOutput(outs.item(i)));
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221 }
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222 }
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223
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224
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225 /**
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226 * A helper method that creates an Output object based on the <i>out</i>
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227 * node.
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228 *
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229 * @param out The output node configuration.
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230 *
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231 * @return an Output object.
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232 */
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233 protected Output buildOutput(Node out) {
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234 String name = XMLUtils.xpathString(
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235 out, "@name", ArtifactNamespaceContext.INSTANCE);
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236
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237 String desc = XMLUtils.xpathString(
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238 out, "@description", ArtifactNamespaceContext.INSTANCE);
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239
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240 String mimetype = XMLUtils.xpathString(
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241 out, "@mime-type", ArtifactNamespaceContext.INSTANCE);
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242
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243 String type = XMLUtils.xpathString(
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244 out, "@type", ArtifactNamespaceContext.INSTANCE);
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245
226
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246 if (name == null) {
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247 return null;
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248 }
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249
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250 NodeList facets = (NodeList) XMLUtils.xpath(
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251 out,
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252 XPATH_FACETS,
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253 XPathConstants.NODESET,
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254 ArtifactNamespaceContext.INSTANCE);
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255
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256 if (facets == null || facets.getLength() == 0) {
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257 return new DefaultOutput(name, desc, mimetype, type);
226
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258 }
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259
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260 int num = facets.getLength();
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261
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262 List<Facet> facetList = new ArrayList<Facet>(num);
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263
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264 for (int i = 0; i < num; i++) {
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265 Facet facet = buildFacet(facets.item(i));
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266
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267 if (facet != null) {
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268 facetList.add(facet);
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269 }
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270 }
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271
290
995fa6994480 Outputs can have a member variable 'type' that should make it easier to distinguish the type of an Output.
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272 return new DefaultOutput(name, desc, mimetype, facetList, type);
226
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273 }
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274
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275
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276 /**
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277 * A helper method that creates a Facet object based on the <i>facet</i>
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278 * node.
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279 *
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280 * @param facet The facet node.
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281 *
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282 * @return a Facet object or null if no valid Facet was found.
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283 */
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284 protected Facet buildFacet(Node facet) {
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285 String name = XMLUtils.xpathString(
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286 facet, "@name", ArtifactNamespaceContext.INSTANCE);
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287
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288 String desc = XMLUtils.xpathString(
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289 facet, "@description", ArtifactNamespaceContext.INSTANCE);
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290
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291 return name != null ? new DefaultFacet(name, desc) : null;
106
ece0fdb07975 Implementations to initialize and retrieve states.
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292 }
105
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293
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294
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295 /**
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296 * Describes the UI of the state. This method needs to be implemented by
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297 * concrete subclasses.
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298 *
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299 * @param artifact A reference to the artifact this state belongs to.
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300 * @param document Describe doucment.
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301 * @param rootNode Parent node for all new elements.
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302 * @param context The CallContext.
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303 * @param uuid The uuid of an artifact.
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304 */
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305 public abstract Element describe(
244
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306 Artifact artifact,
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307 Document document,
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308 Node rootNode,
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309 CallContext context,
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310 String uuid
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311 );
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312 }
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313 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org