org.scijava.console.SystemPropertyArgument 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, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * 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.console;

import java.util.LinkedList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.scijava.plugin.Plugin;

/**
 * Handles the {@code -D} command line argument, in an analogous way to tools
 * such as Java and Maven.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = ConsoleArgument.class)
public class SystemPropertyArgument extends AbstractConsoleArgument {

	private static final String SYS_PROP_REGEX = "-D([\\w\\._-]+)(=(.*))?";
	private static final Pattern SYS_PROP_PAT = Pattern.compile(SYS_PROP_REGEX);

	// -- Constructor --

	public SystemPropertyArgument() {
		super(1);
	}

	// -- ConsoleArgument methods --

	@Override
	public void handle(final LinkedList args) {
		if (!supports(args)) return;

		final String arg = args.removeFirst();
		final Matcher m = SYS_PROP_PAT.matcher(arg);
		if (!m.matches()) {
			throw new IllegalArgumentException("Invalid argument: " + arg);
		}
		final String key = m.group(1);
		final String value = m.group(3);
		System.setProperty(key, value == null ? "" : value);
	}

	// -- Typed methods --

	@Override
	public boolean supports(final LinkedList args) {
		if (!super.supports(args)) return false;
		final String arg = args.getFirst();
		if (!arg.startsWith("-D")) return false;
		return SYS_PROP_PAT.matcher(arg).matches();
	}


}