annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/AbstractUIProvider.java @ 562:9f16ac843dda

Introduced a client side validation before new user data are sent to the server - the range/location panel already implements this validation. flys-client/trunk@2097 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 09 Jun 2011 14:06:10 +0000
parents 4a684d29404f
children dfbc6693247e
rev   line source
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1 package de.intevation.flys.client.client.ui;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 import com.google.gwt.core.client.GWT;
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7
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8 import com.smartgwt.client.util.SC;
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9 import com.smartgwt.client.widgets.Canvas;
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10 import com.smartgwt.client.widgets.Img;
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11 import com.smartgwt.client.widgets.events.ClickEvent;
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12 import com.smartgwt.client.widgets.events.ClickHandler;
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13 import com.smartgwt.client.widgets.Button;
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b92281182c6b Removed the FLYSMessages interface and replaced it with a FLYSConstants interface - this interface has the ability to lookup i18n strings with given keys.
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15 import de.intevation.flys.client.client.FLYSConstants;
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16 import de.intevation.flys.client.client.event.HasStepBackHandlers;
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17 import de.intevation.flys.client.client.event.HasStepForwardHandlers;
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18 import de.intevation.flys.client.client.event.StepBackEvent;
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19 import de.intevation.flys.client.client.event.StepBackHandler;
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20 import de.intevation.flys.client.client.event.StepForwardEvent;
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21 import de.intevation.flys.client.client.event.StepForwardHandler;
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22 import de.intevation.flys.client.shared.model.Data;
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23 import de.intevation.flys.client.shared.model.DataItem;
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24 import de.intevation.flys.client.shared.model.DataList;
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25 import de.intevation.flys.client.shared.model.Artifact;
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26
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27 /**
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28 * An abstract UIProvider that provides some basic methods.
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29 *
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30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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31 */
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32 public abstract class AbstractUIProvider
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33 implements UIProvider, HasStepForwardHandlers, ClickHandler,
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34 HasStepBackHandlers
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35 {
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36 /** The message class that provides i18n strings.*/
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37 protected FLYSConstants MSG = GWT.create(FLYSConstants.class);
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40 /** The StepForwardHandlers.*/
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41 protected List<StepForwardHandler> forwardHandlers;
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42
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43 /** The StepForwardHandlers.*/
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44 protected List<StepBackHandler> backHandlers;
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45
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46 /** The container that is used to position helper widgets.*/
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47 protected Canvas helperContainer;
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48
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49 /** The artifact that contains status information.*/
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50 protected Artifact artifact;
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51
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52 /**
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53 * Creates a new UIProvider instance of this class.
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54 */
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55 public AbstractUIProvider() {
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56 forwardHandlers = new ArrayList<StepForwardHandler>();
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57 backHandlers = new ArrayList<StepBackHandler>();
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58 }
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60
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61 /**
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62 * Appends a StepBackHandler that wants to listen to StepBackEvents.
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63 *
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64 * @param handler A new StepBackHandler.
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65 */
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66 public void addStepBackHandler(StepBackHandler handler) {
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67 if (handler != null) {
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68 backHandlers.add(handler);
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69 }
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70 }
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73 /**
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74 * Appends a StepForwardHandler that wants to listen to StepForwardEvents.
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75 *
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76 * @param handler A new StepForwardHandler.
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77 */
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78 public void addStepForwardHandler(StepForwardHandler handler) {
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79 if (handler != null) {
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80 forwardHandlers.add(handler);
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81 }
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82 }
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84
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85 /**
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86 * This method is called after the user has clicked one of the buttons to
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87 * step back to a previous state.
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88 *
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89 * @param e The StepBackEvent.
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90 */
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91 protected void fireStepBackEvent(StepBackEvent e) {
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92 GWT.log("AbstractUIProvider - fireStepBackEvent() handlers: " + backHandlers.size());
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93 for (StepBackHandler handler: backHandlers) {
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94 handler.onStepBack(e);
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95 }
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96 }
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97
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98
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99 /**
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100 * This method is called after the user has clicked on the 'next' button to
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101 * step to the next state.
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102 *
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103 * @param e The StepForwardEvent.
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104 */
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105 protected void fireStepForwardEvent(StepForwardEvent e) {
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106 GWT.log("AbstractUIProvider - fireStepForwardEvent() handlers: " + forwardHandlers.size());
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107 for (StepForwardHandler handler: forwardHandlers) {
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108 handler.onStepForward(e);
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109 }
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110 }
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111
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112
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113 /**
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114 * This method is used to listen to click events on the 'next' button. The
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115 * fireStepForwardEvent() method is called here.
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116 *
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117 * @param e The click event.
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118 */
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119 public void onClick(ClickEvent e) {
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120 List<String> errors = validate();
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121 if (errors == null || errors.isEmpty()) {
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122 Data[] data = getData();
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123 fireStepForwardEvent(new StepForwardEvent(data));
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124 }
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125 else {
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126 StringBuilder sb = new StringBuilder();
41
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127
562
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128 for (String error: errors) {
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129 sb.append(error);
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130 sb.append("<br>");
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131 }
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132
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133 SC.warn(sb.toString());
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134 }
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135 }
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136
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137
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138 /**
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139 * Creates the 'next' button to step forward to the next state.
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140 *
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141 * @return the 'next' button.
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142 */
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143 protected Canvas getNextButton() {
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144 Button next = new Button(MSG.buttonNext());
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145 next.addClickHandler(this);
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146
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147 return next;
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148 }
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149
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150
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151 /**
58
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152 * Creates the 'back' button to step back to a previous state.
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153 *
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154 * @param targetState The identifier of the target state.
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155 *
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156 * @return the 'back' button.
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157 */
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158 protected Canvas getBackButton(final String targetState) {
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159 String url = GWT.getHostPageBaseURL() + MSG.imageBack();
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160 Img back = new Img(url, 16, 16);
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161
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162 back.addClickHandler(new ClickHandler() {
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163 public void onClick(ClickEvent event) {
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164 fireStepBackEvent(new StepBackEvent(targetState));
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165 }
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166 });
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167
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168 return back;
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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 * This method injects a container that is used to position helper widgets.
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174 *
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175 * @param helperContainer A container that is used to position helper
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176 * widgets.
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177 */
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178 public void setContainer(Canvas helperContainer) {
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179 this.helperContainer = helperContainer;
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180 }
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181
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182
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183 /**
233
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184 * This method injects an artifact that contains the status information.
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185 *
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186 * @param art An artifact containing status information.
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187 */
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188 public void setArtifact(Artifact art) {
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189 this.artifact = art;
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190 }
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191
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192
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193 /**
247
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194 * This method greps the Data with name <i>name</i> from the list and
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195 * returns it.
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196 *
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197 * @param items A list of Data.
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198 * @param name The name of the Data that we are searching for.
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199 *
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200 * @return the Data with the name <i>name</i>.
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201 */
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202 protected Data getData(List<Data> data, String name) {
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203 for (Data d: data) {
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204 if (name.equals(d.getLabel())) {
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205 return d;
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206 }
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207 }
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208
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209 return null;
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210 }
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211
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212 /**
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213 * This method greps the DataItem with name <i>name</i> from the list and
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214 * returns it.
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215 *
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216 * @param items A list of DataItems.
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217 * @param name The name of the DataItem that we are searching for.
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218 *
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219 * @return the DataItem with the name <i>name</i>.
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220 */
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221 protected DataItem getDataItem(DataItem[] items, String name) {
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222 for (DataItem item: items) {
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223 if (name.equals(item.getLabel())) {
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224 return item;
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225 }
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226 }
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227
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228 return null;
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229 }
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230
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231
562
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232 public List<String> validate() {
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233 return new ArrayList<String>();
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234 }
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235
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236
247
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237 /**
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238 * This method needs to be implemented by concrete subclasses. It should
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239 * create a new Canvas object with a representation of <i>data</i>.
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240 *
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241 * @param data The data that should be displayed.
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242 *
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243 * @return a Canvas object that displays <i>data</i>.
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244 */
51
a2923d63f530 Introduced a data structure DataList to manage to list of Data objects of a single state.
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245 public abstract Canvas create(DataList data);
41
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246
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247
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248 /**
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249 * This method needs to be implemented by concrete subclasses. It should
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250 * return the selected data.
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251 *
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252 * @return the selected data.
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253 */
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254 protected abstract Data[] getData();
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255 }
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256 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :

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