scijava-common/src/main/java/org/scijava/app/App.java at nameservice · scijava/scijava-common · GitHub

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* #%L

* SciJava Common shared library for SciJava software.

* %%

* 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}.

*

* 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.

*

* @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.

*

* NB: This metadata may be null if run in a development environment.

*

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.

*

* SciJava conforms to the <a href="http://semver.org/">Semantic

* Versioning</a> specification.

*

* @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";

}

scijava-common/src/main/java/org/scijava/app/App.java at nameservice · scijava/scijava-common · GitHub

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