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annotate org.eclipse.equinox.common/src/org/eclipse/core/runtime/SubProgressMonitor.d @ 105:bbe49769ec18

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author Frank Benoit <benoit@tionex.de>
date Sun, 08 Nov 2009 12:42:30 +0100
parents bc29606a740c
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 // Port to the D programming language:
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12 // Frank Benoit <benoit@tionex.de>
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13 module org.eclipse.core.runtimeSubProgressMonitor;
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.core.runtimeIProgressMonitor; // packageimport
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18 import org.eclipse.core.runtimeProgressMonitorWrapper; // packageimport
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19
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20 /**
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21 * For new implementations consider using {@link SubMonitor}.
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22 *
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23 * A progress monitor that uses a given amount of work ticks
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24 * from a parent monitor. It can be used as follows:
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25 * <pre>
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26 * try {
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27 * pm.beginTask("Main Task", 100);
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28 * doSomeWork(pm, 30);
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29 * SubProgressMonitor subMonitor= new SubProgressMonitor(pm, 40);
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30 * try {
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31 * subMonitor.beginTask("", 300);
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32 * doSomeWork(subMonitor, 300);
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33 * } finally {
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34 * subMonitor.done();
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35 * }
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36 * doSomeWork(pm, 30);
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37 * } finally {
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38 * pm.done();
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39 * }
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40 * </pre>
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41 * <p>
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42 * This class can be used without OSGi running.
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43 * </p><p>
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44 * This class may be instantiated or subclassed by clients.
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45 * </p>
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46 *
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47 * @see SubMonitor
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48 */
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49 public class SubProgressMonitor : ProgressMonitorWrapper {
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50
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51 /**
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52 * Style constant indicating that calls to <code>subTask</code>
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53 * should not have any effect.
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54 *
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55 * @see #SubProgressMonitor(IProgressMonitor,int,int)
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56 */
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57 public static final int SUPPRESS_SUBTASK_LABEL = 1 << 1;
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58 /**
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59 * Style constant indicating that the main task label
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60 * should be prepended to the subtask label.
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61 *
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62 * @see #SubProgressMonitor(IProgressMonitor,int,int)
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63 */
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64 public static final int PREPEND_MAIN_LABEL_TO_SUBTASK = 1 << 2;
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65
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66 private int parentTicks = 0;
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67 private double sentToParent = 0.0;
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68 private double scale = 0.0;
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69 private int nestedBeginTasks = 0;
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70 private bool usedUp = false;
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71 private bool hasSubTask = false;
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72 private int style;
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73 private String mainTaskLabel;
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74
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75 /**
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76 * Creates a new sub-progress monitor for the given monitor. The sub
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77 * progress monitor uses the given number of work ticks from its
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78 * parent monitor.
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79 *
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80 * @param monitor the parent progress monitor
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81 * @param ticks the number of work ticks allocated from the
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82 * parent monitor
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83 */
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84 public this(IProgressMonitor monitor, int ticks) {
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85 this(monitor, ticks, 0);
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86 }
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87
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88 /**
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89 * Creates a new sub-progress monitor for the given monitor. The sub
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90 * progress monitor uses the given number of work ticks from its
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91 * parent monitor.
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92 *
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93 * @param monitor the parent progress monitor
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94 * @param ticks the number of work ticks allocated from the
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95 * parent monitor
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96 * @param style one of
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97 * <ul>
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98 * <li> <code>SUPPRESS_SUBTASK_LABEL</code> </li>
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99 * <li> <code>PREPEND_MAIN_LABEL_TO_SUBTASK</code> </li>
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100 * </ul>
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101 * @see #SUPPRESS_SUBTASK_LABEL
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102 * @see #PREPEND_MAIN_LABEL_TO_SUBTASK
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103 */
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104 public this(IProgressMonitor monitor, int ticks, int style) {
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105 super(monitor);
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106 this.parentTicks = (ticks > 0) ? ticks : 0;
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107 this.style = style;
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108 }
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109
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110 /* (Intentionally not javadoc'd)
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111 * Implements the method <code>IProgressMonitor.beginTask</code>.
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112 *
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113 * Starts a new main task. Since this progress monitor is a sub
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114 * progress monitor, the given name will NOT be used to update
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115 * the progress bar's main task label. That means the given
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116 * string will be ignored. If style <code>PREPEND_MAIN_LABEL_TO_SUBTASK
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117 * <code> is specified, then the given string will be prepended to
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118 * every string passed to <code>subTask(String)</code>.
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119 */
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120 public void beginTask(String name, int totalWork) {
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121 nestedBeginTasks++;
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122 // Ignore nested begin task calls.
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123 if (nestedBeginTasks > 1) {
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124 return;
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125 }
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126 // be safe: if the argument would cause math errors (zero or
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127 // negative), just use 0 as the scale. This disables progress for
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128 // this submonitor.
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129 scale = totalWork <= 0 ? 0 : cast(double) parentTicks / cast(double) totalWork;
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130 if ((style & PREPEND_MAIN_LABEL_TO_SUBTASK) !is 0) {
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131 mainTaskLabel = name;
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132 }
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133 }
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134
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135 /* (Intentionally not javadoc'd)
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136 * Implements the method <code>IProgressMonitor.done</code>.
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137 */
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138 public void done() {
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139 // Ignore if more done calls than beginTask calls or if we are still
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140 // in some nested beginTasks
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141 if (nestedBeginTasks is 0 || --nestedBeginTasks > 0)
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142 return;
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143 // Send any remaining ticks and clear out the subtask text
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144 double remaining = parentTicks - sentToParent;
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145 if (remaining > 0)
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146 super.internalWorked(remaining);
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147 //clear the sub task if there was one
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148 if (hasSubTask)
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149 subTask(""); //$NON-NLS-1$
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150 sentToParent = 0;
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151 }
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152
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153 /* (Intentionally not javadoc'd)
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154 * Implements the internal method <code>IProgressMonitor.internalWorked</code>.
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155 */
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156 public void internalWorked(double work) {
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157 if (usedUp || nestedBeginTasks !is 1) {
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158 return;
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159 }
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160
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161 double realWork = (work > 0.0d) ? scale * work : 0.0d;
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162 super.internalWorked(realWork);
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163 sentToParent += realWork;
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164 if (sentToParent >= parentTicks) {
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165 usedUp = true;
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166 }
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167 }
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168
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169 /* (Intentionally not javadoc'd)
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170 * Implements the method <code>IProgressMonitor.subTask</code>.
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171 */
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172 public void subTask(String name) {
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173 if ((style & SUPPRESS_SUBTASK_LABEL) !is 0) {
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174 return;
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175 }
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176 hasSubTask = true;
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177 String label = name;
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178 if ((style & PREPEND_MAIN_LABEL_TO_SUBTASK) !is 0 && mainTaskLabel !is null && mainTaskLabel.length() > 0) {
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179 label = mainTaskLabel + ' ' + label;
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180 }
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181 super.subTask(label);
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182 }
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183
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184 /* (Intentionally not javadoc'd)
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185 * Implements the method <code>IProgressMonitor.worked</code>.
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186 */
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187 public void worked(int work) {
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188 internalWorked(work);
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189 }
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190 }