org.scijava.io.DefaultRecentFileService Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of scijava-common Show documentation
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.
There is a newer version: 2.99.0
Show newest version
/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2017 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, Max Planck
 * Institute of Molecular Cell Biology and Genetics, University of
 * Konstanz, and KNIME GmbH.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

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);
	}

}