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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
/*
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* SciJava Common shared library for SciJava software.
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* Copyright (C) 2009 - 2016 Board of Regents of the University of
* Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
* Institute of Molecular Cell Biology and Genetics.
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
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package org.scijava.io;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.scijava.MenuEntry;
import org.scijava.MenuPath;
import org.scijava.command.CommandInfo;
import org.scijava.command.CommandService;
import org.scijava.event.EventHandler;
import org.scijava.event.EventService;
import org.scijava.io.event.IOEvent;
import org.scijava.menu.MenuConstants;
import org.scijava.module.ModuleInfo;
import org.scijava.module.ModuleService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.prefs.PrefService;
import org.scijava.service.AbstractService;
import org.scijava.service.Service;
import org.scijava.util.FileUtils;
// TODO - DefaultRecentFileService, DefaultWindowService, and DefaultLUTService
// all build menus dynamically (see createInfo()). We may be able to abstract a
// helper class out of these that can be used by them and future services.
/**
* Default service for managing the Recently Used Files menu.
*
* Behavior: There is a limited number of files presented (maxFilesShown),
* regardless of the list length. When a file is opened, its path is added to
* the top of the list. If data has been saved as a new file, its path is added
* to the top of the list.
*
*
* @author Grant Harris
* @author Curtis Rueden
*/
@Plugin(type = Service.class)
public final class DefaultRecentFileService extends AbstractService implements
RecentFileService
{
// -- Constants --
/** Maximum pathname length shown. */
private static final int MAX_DISPLAY_LENGTH = 40;
private static final String RECENT_MENU_NAME = "Open Recent";
private static final String RECENT_FILES_KEY = "recentfiles";
// -- Fields --
@Parameter
private EventService eventService;
@Parameter
private ModuleService moduleService;
@Parameter
private CommandService commandService;
@Parameter
private PrefService prefService;
private List recentFiles;
private Map recentModules;
// -- RecentFileService methods --
@Override
public void add(final String path) {
final boolean present = recentModules.containsKey(path);
// add path to recent files list
if (present) recentFiles.remove(path);
recentFiles.add(path);
// persist the updated list
saveList();
if (present) {
// path already present; update linked module info
final ModuleInfo info = recentModules.get(path);
// TODO - update module weights
info.update(eventService);
}
else {
// new path; create linked module info
final ModuleInfo info = createInfo(path);
recentModules.put(path, info);
// register the module with the module service
moduleService.addModule(info);
}
}
@Override
public boolean remove(final String path) {
// remove path from recent files list
final boolean success = recentFiles.remove(path);
// persist the updated list
saveList();
// remove linked module info
final ModuleInfo info = recentModules.remove(path);
if (info != null) moduleService.removeModule(info);
return success;
}
@Override
public void clear() {
recentFiles.clear();
prefService.clear(RecentFileService.class, RECENT_FILES_KEY);
// unregister the modules with the module service
moduleService.removeModules(recentModules.values());
recentModules.clear();
}
@Override
public List getRecentFiles() {
return Collections.unmodifiableList(recentFiles);
}
// -- Service methods --
@Override
public void initialize() {
loadList();
recentModules = new HashMap<>();
for (final String path : recentFiles) {
recentModules.put(path, createInfo(path));
}
// register the modules with the module service
moduleService.addModules(recentModules.values());
}
// -- Event handlers --
@EventHandler
protected void onEvent(final IOEvent event) {
add(event.getDescriptor());
}
// -- Helper methods --
/** Loads the list of recent files from persistent storage. */
private void loadList() {
recentFiles = prefService.getList(RecentFileService.class,
RECENT_FILES_KEY);
}
/** Saves the list of recent files to persistent storage. */
private void saveList() {
prefService.putList(RecentFileService.class, recentFiles, RECENT_FILES_KEY);
}
/** Creates a {@link ModuleInfo} to reopen data at the given path. */
private ModuleInfo createInfo(final String path) {
// CTR FIXME: Avoid circular (and compile-time-unsafe) dependency between
// scijava-common and scijava-plugins-commands.
final String commandClassName = "org.scijava.plugins.commands.io.OpenFile";
final CommandInfo info = new CommandInfo(commandClassName);
// hard code path to open as a preset
final HashMap presets = new HashMap<>();
presets.put("inputFile", path);
info.setPresets(presets);
// set menu path
final MenuPath menuPath = new MenuPath();
menuPath.add(new MenuEntry(MenuConstants.FILE_LABEL));
menuPath.add(new MenuEntry(RECENT_MENU_NAME));
final MenuEntry leaf = new MenuEntry(shortPath(path));
menuPath.add(leaf);
info.setMenuPath(menuPath);
// set menu position
leaf.setWeight(0); // TODO - do this properly
// use the same icon as File > Open
final CommandInfo fileOpen = commandService.getCommand(commandClassName);
if (fileOpen != null) {
final String iconPath = fileOpen.getIconPath();
info.setIconPath(iconPath);
}
return info;
}
/** Shortens the given path to ensure it conforms to a maximum length. */
private String shortPath(final String path) {
// TODO - shorten path name as needed
return FileUtils.limitPath(path, MAX_DISPLAY_LENGTH);
}
}