1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.gui;
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3 |
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4 | import java.awt.Component;
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5 | import java.awt.EventQueue;
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6 | import java.io.IOException;
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7 |
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8 | import javax.swing.SwingUtilities;
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9 |
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10 | import org.openstreetmap.josm.gui.progress.PleaseWaitProgressMonitor;
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11 | import org.openstreetmap.josm.gui.progress.ProgressMonitor;
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12 | import org.openstreetmap.josm.gui.progress.ProgressMonitor.CancelListener;
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13 | import org.openstreetmap.josm.gui.progress.ProgressTaskId;
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14 | import org.openstreetmap.josm.io.OsmTransferException;
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15 | import org.openstreetmap.josm.tools.BugReportExceptionHandler;
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16 | import org.openstreetmap.josm.tools.CheckParameterUtil;
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17 | import org.xml.sax.SAXException;
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18 |
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19 | /**
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20 | * Instanced of this thread will display a "Please Wait" message in middle of JOSM
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21 | * to indicate a progress being executed.
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22 | *
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23 | * @author Imi
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24 | */
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25 | public abstract class PleaseWaitRunnable implements Runnable, CancelListener {
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26 | private boolean canceled = false;
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27 | private boolean ignoreException;
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28 | private final String title;
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29 |
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30 | protected final ProgressMonitor progressMonitor;
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31 |
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32 | /**
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33 | * Create the runnable object with a given message for the user.
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34 | */
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35 | public PleaseWaitRunnable(String title) {
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36 | this(title, false);
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37 | }
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38 | /**
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39 | * Create the runnable object with a given message for the user.
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40 | *
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41 | * @param title message for the user
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42 | * @param ignoreException If true, exception will be propagated to calling code. If false then
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43 | * exception will be thrown directly in EDT. When this runnable is executed using executor framework
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44 | * then use false unless you read result of task (because exception will get lost if you don't)
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45 | */
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46 | public PleaseWaitRunnable(String title, boolean ignoreException) {
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47 | this(title, new PleaseWaitProgressMonitor(title), ignoreException);
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48 | }
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49 |
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50 | /**
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51 | * Create the runnable object with a given message for the user
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52 | *
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53 | * @param parent the parent component for the please wait dialog. Must not be null.
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54 | * @param title message for the user
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55 | * @param ignoreException If true, exception will be propagated to calling code. If false then
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56 | * exception will be thrown directly in EDT. When this runnable is executed using executor framework
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57 | * then use false unless you read result of task (because exception will get lost if you don't)
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58 | * @throws IllegalArgumentException thrown if parent is null
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59 | */
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60 | public PleaseWaitRunnable(Component parent, String title, boolean ignoreException) throws IllegalArgumentException{
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61 | CheckParameterUtil.ensureParameterNotNull(parent, "parent");
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62 | this.title = title;
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63 | this.progressMonitor = new PleaseWaitProgressMonitor(parent, title);
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64 | this.ignoreException = ignoreException;
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65 | }
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66 |
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67 | public PleaseWaitRunnable(String title, ProgressMonitor progressMonitor, boolean ignoreException) {
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68 | this.title = title;
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69 | this.progressMonitor = progressMonitor == null?new PleaseWaitProgressMonitor(title):progressMonitor;
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70 | this.ignoreException = ignoreException;
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71 | }
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72 |
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73 | private void doRealRun() {
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74 | try {
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75 | ProgressTaskId oldTaskId = null;
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76 | try {
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77 | progressMonitor.addCancelListener(this);
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78 | progressMonitor.beginTask(title);
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79 | oldTaskId = progressMonitor.getProgressTaskId();
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80 | progressMonitor.setProgressTaskId(canRunInBackground());
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81 | try {
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82 | realRun();
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83 | } finally {
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84 | if (EventQueue.isDispatchThread()) {
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85 | finish();
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86 | } else {
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87 | EventQueue.invokeAndWait(new Runnable() {
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88 | public void run() {
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89 | finish();
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90 | }
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91 | });
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92 | }
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93 | }
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94 | } finally {
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95 | progressMonitor.finishTask();
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96 | progressMonitor.removeCancelListener(this);
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97 | progressMonitor.setProgressTaskId(oldTaskId);
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98 | if (progressMonitor instanceof PleaseWaitProgressMonitor) {
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99 | ((PleaseWaitProgressMonitor)progressMonitor).close();
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100 | }
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101 | afterFinish();
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102 | }
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103 | } catch (final Exception e) {
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104 | if (!ignoreException) {
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105 | // Exception has to thrown in EDT to be shown to user
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106 | SwingUtilities.invokeLater(new Runnable() {
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107 | public void run() {
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108 | if (e instanceof RuntimeException) {
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109 | BugReportExceptionHandler.handleException(e);
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110 | } else {
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111 | ExceptionDialogUtil.explainException(e);
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112 | }
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113 | }
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114 | });
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115 | }
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116 | }
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117 | }
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118 |
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119 | /**
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120 | * Can be overriden if something needs to run after progress monitor is closed.
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121 | */
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122 | protected void afterFinish() {
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123 |
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124 | }
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125 |
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126 | public final void run() {
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127 | if (canceled)
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128 | return; // since realRun isn't executed, do not call to finish
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129 |
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130 | if (EventQueue.isDispatchThread()) {
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131 | new Thread(new Runnable() {
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132 | public void run() {
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133 | doRealRun();
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134 | }
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135 | }).start();
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136 | } else {
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137 | doRealRun();
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138 | }
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139 | }
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140 |
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141 | public void operationCanceled() {
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142 | cancel();
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143 | }
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144 |
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145 | /**
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146 | * User pressed cancel button.
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147 | */
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148 | protected abstract void cancel();
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149 |
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150 | /**
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151 | * Called in the worker thread to do the actual work. When any of the
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152 | * exception is thrown, a message box will be displayed and closeDialog
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153 | * is called. finish() is called in any case.
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154 | */
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155 | protected abstract void realRun() throws SAXException, IOException, OsmTransferException;
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156 |
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157 | /**
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158 | * Finish up the data work. Is guaranteed to be called if realRun is called.
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159 | * Finish is called in the gui thread just after the dialog disappeared.
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160 | */
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161 | protected abstract void finish();
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162 |
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163 | public ProgressMonitor getProgressMonitor() {
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164 | return progressMonitor;
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165 | }
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166 |
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167 | /**
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168 | * Task can run in background if returned value <> null. Note that it's tasks responsibility
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169 | * to ensure proper synchronization, PleaseWaitRunnable doesn't with it.
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170 | * @return If returned value is <> null then task can run in background. TaskId could be used in future for "Always run in background" checkbox
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171 | */
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172 | public ProgressTaskId canRunInBackground() {
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173 | return null;
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174 | }
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175 | }
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