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SpotBugs: Because it's easy!
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/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2003,2004 University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs;

import edu.umd.cs.findbugs.classfile.IClassPathBuilderProgress;

/**
 * A callback that may be installed in a FindBugs instance to asynchronously
 * keep track of its progress.
 *
 * @author David Hovemeyer
 * @see FindBugs
 */
public interface FindBugsProgress extends IClassPathBuilderProgress {
    /**
     * Report the total number of archives (Jar or zip files) that will be
     * analyzed.
     *
     * @param numArchives
     *            the number of archives
     */
    public void reportNumberOfArchives(int numArchives);

    /**
     * Report that FindBugs has started scanning an archive in order to add its
     * classes to the repository.
     */
    @Override
    public void startArchive(String name);

    /**
     * Report that FindBugs has finished scanning an archive in order to add its
     * classes to the repository.
     */
    @Override
    public void finishArchive();

    /**
     * Provide an array that predicts the number of classes in each pass
     *
     * @param classesPerPass
     */
    public void predictPassCount(int[] classesPerPass);

    /**
     * Report that FindBugs has finished scanning the archives and will start
     * analysing the classes contained therein.
     *
     * @param numClasses
     *            number of classes found in all of the archives
     */
    public void startAnalysis(int numClasses);

    /**
     * Report that FindBugs has finished analyzing a class.
     */
    public void finishClass();

    /**
     * Called to indicate that the per-class analysis is finished, and that the
     * whole program analysis is taking place.
     */
    public void finishPerClassAnalysis();
}