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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.HashSet;
import java.util.LinkedList;
import java.util.Set;
import org.scijava.plugin.AbstractHandlerPlugin;
/**
* Abstract superclass of {@link ConsoleArgument} implementations.
*
* @author Curtis Rueden
*/
public abstract class AbstractConsoleArgument extends
AbstractHandlerPlugin> implements ConsoleArgument
{
private int numArgs;
private Set flags;
public AbstractConsoleArgument() {
this(1, new String[0]);
}
public AbstractConsoleArgument(final String... flags) {
this(1, flags);
}
public AbstractConsoleArgument(final int requiredArgs, final String... flags) {
numArgs = requiredArgs;
this.flags = new HashSet<>();
for (final String s : flags) this.flags.add(s);
}
// -- Typed methods --
@Override
public boolean supports(final LinkedList args) {
if (args == null || args.size() < numArgs) return false;
return isFlag(args);
}
@Override
@SuppressWarnings({ "rawtypes", "unchecked" })
public Class> getType() {
return (Class) String.class;
}
/**
* Check if the given list of arguments starts with a flag that matches this
* {@link ConsoleArgument}.
*
* @return true iff one of this argument's flags matches the first string in
* the given list, or this argument has no explicit flags.
*/
protected boolean isFlag(final LinkedList args) {
return flags.isEmpty() || flags.contains(args.getFirst());
}
/**
* If the next argument is an appropriate parameter to a
* {@link ConsoleArgument}, retrieves it; otherwise, returns null.
*
* @return The first argument of the given list, if it does not
* start with a {@code '-'} character; or null otherwise.
*/
protected String getParam(final LinkedList args) {
if (args.isEmpty()) return null;
final String arg = args.getFirst();
return arg.startsWith("-") ? null : arg;
}
}