1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.plugins;
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3 |
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4 | import static org.openstreetmap.josm.tools.I18n.tr;
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5 |
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6 | import java.io.File;
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7 | import java.net.URL;
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8 | import java.net.URLClassLoader;
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9 | import java.security.AccessController;
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10 | import java.security.PrivilegedAction;
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11 | import java.util.List;
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12 |
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13 | import org.openstreetmap.josm.data.Preferences;
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14 | import org.openstreetmap.josm.gui.MapFrame;
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15 | import org.openstreetmap.josm.gui.MapFrameListener;
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16 | import org.openstreetmap.josm.gui.download.DownloadSelection;
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17 | import org.openstreetmap.josm.gui.preferences.PreferenceSetting;
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18 | import org.openstreetmap.josm.spi.preferences.Config;
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19 | import org.openstreetmap.josm.spi.preferences.IBaseDirectories;
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20 | import org.openstreetmap.josm.tools.Logging;
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21 | import org.openstreetmap.josm.tools.Utils;
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22 |
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23 | /**
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24 | * For all purposes of loading dynamic resources, the Plugin's class loader should be used
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25 | * (or else, the plugin jar will not be within the class path).
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26 | *
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27 | * A plugin may subclass this abstract base class (but it is optional).
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28 | *
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29 | * The actual implementation of this class is optional, as all functions will be called
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30 | * via reflection. This is to be able to change this interface without the need of
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31 | * recompiling or even breaking the plugins. If your class does not provide a
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32 | * function here (or does provide a function with a mismatching signature), it will not
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33 | * be called. That simple.
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34 | *
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35 | * Or in other words: See this base class as an documentation of what automatic callbacks
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36 | * are provided (you can register yourself to more callbacks in your plugin class
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37 | * constructor).
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38 | *
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39 | * Subclassing Plugin and overriding some functions makes it easy for you to keep sync
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40 | * with the correct actual plugin architecture of JOSM.
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41 | *
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42 | * @author Immanuel.Scholz
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43 | */
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44 | public abstract class Plugin implements MapFrameListener {
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45 |
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46 | /**
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47 | * This is the info available for this plugin. You can access this from your
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48 | * constructor.
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49 | *
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50 | * (The actual implementation to request the info from a static variable
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51 | * is a bit hacky, but it works).
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52 | */
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53 | private PluginInformation info;
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54 |
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55 | private final IBaseDirectories pluginBaseDirectories = new PluginBaseDirectories();
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56 |
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57 | private class PluginBaseDirectories implements IBaseDirectories {
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58 | private File preferencesDir;
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59 | private File cacheDir;
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60 | private File userdataDir;
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61 |
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62 | @Override
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63 | public File getPreferencesDirectory(boolean createIfMissing) {
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64 | if (preferencesDir == null) {
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65 | preferencesDir = Config.getDirs().getPreferencesDirectory(createIfMissing).toPath()
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66 | .resolve("plugins").resolve(info.name).toFile();
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67 | }
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68 | if (createIfMissing && !preferencesDir.exists() && !preferencesDir.mkdirs()) {
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69 | Logging.error(tr("Failed to create missing plugin preferences directory: {0}", preferencesDir.getAbsoluteFile()));
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70 | }
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71 | return preferencesDir;
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72 | }
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73 |
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74 | @Override
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75 | public File getUserDataDirectory(boolean createIfMissing) {
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76 | if (userdataDir == null) {
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77 | userdataDir = Config.getDirs().getUserDataDirectory(createIfMissing).toPath()
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78 | .resolve("plugins").resolve(info.name).toFile();
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79 | }
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80 | if (createIfMissing && !userdataDir.exists() && !userdataDir.mkdirs()) {
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81 | Logging.error(tr("Failed to create missing plugin user data directory: {0}", userdataDir.getAbsoluteFile()));
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82 | }
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83 | return userdataDir;
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84 | }
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85 |
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86 | @Override
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87 | public File getCacheDirectory(boolean createIfMissing) {
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88 | if (cacheDir == null) {
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89 | cacheDir = Config.getDirs().getCacheDirectory(createIfMissing).toPath()
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90 | .resolve("plugins").resolve(info.name).toFile();
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91 | }
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92 | if (createIfMissing && !cacheDir.exists() && !cacheDir.mkdirs()) {
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93 | Logging.error(tr("Failed to create missing plugin cache directory: {0}", cacheDir.getAbsoluteFile()));
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94 | }
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95 | return cacheDir;
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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 | * Creates the plugin
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101 | *
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102 | * @param info the plugin information describing the plugin.
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103 | */
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104 | public Plugin(PluginInformation info) {
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105 | this.info = info;
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106 | }
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107 |
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108 | /**
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109 | * Replies the plugin information object for this plugin
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110 | *
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111 | * @return the plugin information object
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112 | */
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113 | public PluginInformation getPluginInformation() {
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114 | return info;
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115 | }
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116 |
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117 | /**
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118 | * Sets the plugin information object for this plugin
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119 | *
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120 | * @param info the plugin information object
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121 | */
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122 | public void setPluginInformation(PluginInformation info) {
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123 | this.info = info;
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124 | }
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125 |
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126 | /**
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127 | * Get the directories where this plugin can store various files.
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128 | * @return the directories where this plugin can store files
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129 | * @since 13007
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130 | */
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131 | public IBaseDirectories getPluginDirs() {
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132 | return pluginBaseDirectories;
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133 | }
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134 |
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135 | @Override
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136 | public void mapFrameInitialized(MapFrame oldFrame, MapFrame newFrame) {}
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137 |
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138 | /**
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139 | * Called in the preferences dialog to create a preferences page for the plugin,
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140 | * if any available.
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141 | * @return the preferences dialog, or {@code null}
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142 | */
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143 | public PreferenceSetting getPreferenceSetting() {
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144 | return null;
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145 | }
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146 |
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147 | /**
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148 | * Called in the download dialog to give the plugin a chance to modify the list
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149 | * of bounding box selectors.
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150 | * @param list list of bounding box selectors
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151 | */
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152 | public void addDownloadSelection(List<DownloadSelection> list) {}
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153 |
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154 | /**
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155 | * Get a class loader for loading resources from the plugin jar.
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156 | *
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157 | * This can be used to avoid getting a file from another plugin that
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158 | * happens to have a file with the same file name and path.
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159 | *
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160 | * Usage: Instead of
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161 | * getClass().getResource("/resources/pluginProperties.properties");
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162 | * write
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163 | * getPluginResourceClassLoader().getResource("resources/pluginProperties.properties");
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164 | *
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165 | * (Note the missing leading "/".)
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166 | * @return a class loader for loading resources from the plugin jar
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167 | */
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168 | public ClassLoader getPluginResourceClassLoader() {
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169 | File pluginDir = Preferences.main().getPluginsDirectory();
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170 | File pluginJar = new File(pluginDir, info.name + ".jar");
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171 | final URL pluginJarUrl = Utils.fileToURL(pluginJar);
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172 | return AccessController.doPrivileged((PrivilegedAction<ClassLoader>)
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173 | () -> new URLClassLoader(new URL[] {pluginJarUrl}, Plugin.class.getClassLoader()));
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174 | }
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175 | }
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