org.eclim.annotation.CommandListingProcessor.java Source code

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Here is the source code for org.eclim.annotation.CommandListingProcessor.java

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/**
 * Copyright (C) 2005 - 2009  Eric Van Dewoestine
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.eclim.annotation;

import java.util.Collection;
import java.util.Set;

import java.util.regex.Pattern;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;

import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;

import org.apache.commons.cli.Option;

import org.eclim.command.Options;

/**
 * Annotation processor for listing all eclim commands.
 *
 * @author Eric Van Dewoestine
 */
@SupportedAnnotationTypes({ "org.eclim.annotation.Command" })
public class CommandListingProcessor extends AbstractProcessor {
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment env) {
        Options options = new Options();
        Pattern pattern = null;
        String filter = this.processingEnv.getOptions().get("filter");
        if (filter != null) {
            pattern = Pattern.compile(filter);
        }
        for (TypeElement element : annotations) {
            for (Element e : env.getElementsAnnotatedWith(element)) {
                Command command = e.getAnnotation(Command.class);
                if (pattern == null || pattern.matcher(command.name()).matches()) {
                    Collection<Option> opts = options.parseOptions(command.options());
                    System.out.print(command.name());
                    for (Option opt : opts) {
                        String display = "-" + opt.getOpt();
                        if (opt.hasArg()) {
                            display += " " + opt.getLongOpt();
                        }
                        if (opt.isRequired()) {
                            System.out.print(" " + display);
                        } else {
                            System.out.print(" [" + display + "]");
                        }
                    }
                    System.out.println("\n\tclass: " + e);
                }
            }
        }
        return true;
    }
}