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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.
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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();
}
}