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/*
* #%L
* SciJava Common shared library for SciJava software.
* %%
* Copyright (C) 2009 - 2026 SciJava developers.
* %%
* 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.app;
import java.io.File;
import org.scijava.plugin.Plugin;
import org.scijava.plugin.RichPlugin;
import org.scijava.plugin.SingletonPlugin;
import org.scijava.util.AppUtils;
import org.scijava.util.Manifest;
import org.scijava.util.POM;
/**
* Metadata about a SciJava-based application, used by the {@link AppService}.
* <p>
* Applications discoverable at runtime must implement this interface and be
* annotated with @{@link Plugin} with attribute {@link Plugin#type()} =
* {@link App}.class. While it possible to create an application merely by
* implementing this interface, it is encouraged to instead extend
* {@link AbstractApp}, for convenience.
* </p>
*
* @author Curtis Rueden
* @see Plugin
* @see AppService
*/
public interface App extends RichPlugin, SingletonPlugin {
/** Gets the title of the application. */
default String getTitle() {
return getInfo().getName();
}
/** The Maven {@code groupId} of the application. */
String getGroupId();
/** The Maven {@code artifactId} of the application. */
String getArtifactId();
/** Gets the Maven POM containing metadata about the application. */
POM getPOM();
/**
* Gets the manifest containing metadata about the application.
* <p>
* NB: This metadata may be null if run in a development environment.
* </p>
*/
Manifest getManifest();
/**
* Gets a string with information about the application.
*
* @param mem If true, memory usage information is included.
*/
default String getInfo(final boolean mem) {
final String appTitle = getTitle();
final String appVersion = getVersion();
final String javaVersion = System.getProperty("java.version");
final String osArch = System.getProperty("os.arch");
final long maxMem = Runtime.getRuntime().maxMemory();
final long totalMem = Runtime.getRuntime().totalMemory();
final long freeMem = Runtime.getRuntime().freeMemory();
final long usedMem = totalMem - freeMem;
final long usedMB = usedMem / 1048576;
final long maxMB = maxMem / 1048576;
final StringBuilder sb = new StringBuilder();
sb.append(appTitle + " " + appVersion);
sb.append("; Java " + javaVersion + " [" + osArch + "]");
if (mem) sb.append("; " + usedMB + "MB of " + maxMB + "MB");
return sb.toString();
}
/**
* A system property which, if set, overrides the base directory of the
* application.
*/
default String getSystemProperty() {
return getInfo().getName().toLowerCase() + ".dir";
}
/**
* Gets the application's root directory. If the application's system property
* is set, it is used. Otherwise, we scan up the tree from this class for a
* suitable directory.
*/
default File getBaseDirectory() {
return AppUtils.getBaseDirectory(getSystemProperty(), getClass(), null);
}
/**
* Displays information about the application. Typically this action
* takes the form as About dialog in the UI, and/or a message on the console.
*/
void about();
/**
* Displays application preferences. The behavior is application-specific, but
* typically a preferences dialog will be shown onscreen.
*/
default void prefs() {
// NB: Do nothing.
}
/**
* Quits the application. Typically this action will prompt the user about any
* unsaved work first.
*/
default void quit() {
getContext().dispose();
}
// -- Versioned methods --
/**
* Gets the version of the application.
* <p>
* SciJava conforms to the <a href="https://semver.org/">Semantic
* Versioning</a> specification.
* </p>
*
* @return The application version, in {@code major.minor.micro} format.
*/
@Override
default String getVersion() {
// NB: We do not use VersionUtils.getVersion(c, groupId, artifactId)
// because that method does not cache the parsed Manifest and/or POM.
// We might have them already parsed here, and if not, we want to
// parse then cache locally, rather than discarding them afterwards.
// try the manifest first, since it might know its build number
final Manifest m = getManifest();
if (m != null) {
final String v = m.getVersion();
if (v != null) return v;
}
// try the POM
final POM p = getPOM();
if (p != null) {
final String v = p.getVersion();
if (v != null) return v;
}
return "Unknown";
}
}