org.scijava.console.SystemPropertyArgument Maven / Gradle / Ivy

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 * Institute of Molecular Cell Biology and Genetics, University of
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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();
	}


}