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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 java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

/**
 * Recursively search a directory, its subdirectories, etc. Note that the search
 * algorithm uses a worklist, so its implementation does not use recursive
 * method calls.
 *
 * @author David Hovemeyer
 */
public class RecursiveFileSearch {
    private final String baseDir;

    private final FileFilter fileFilter;

    private final LinkedList directoryWorkList;

    private final HashSet directoriesScanned = new HashSet<>();

    private final List directoriesScannedList = new LinkedList<>();

    private final ArrayList resultList;

    /**
     * Constructor.
     *
     * @param baseDir
     *            the base directory for the search
     * @param fileFilter
     *            chooses files to add to the results, and subdirectories to
     *            continue the search in
     */
    public RecursiveFileSearch(String baseDir, FileFilter fileFilter) {
        this.baseDir = baseDir;
        this.fileFilter = fileFilter;
        this.directoryWorkList = new LinkedList<>();
        this.resultList = new ArrayList<>();
    }

    static String bestEffortCanonicalPath(File f) {
        try {
            return f.getCanonicalPath();
        } catch (IOException e) {
            return f.getAbsolutePath();
        }
    }

    /**
     * Perform the search.
     *
     * @return this object
     * @throws InterruptedException
     *             if the thread is interrupted before the search completes
     */
    public RecursiveFileSearch search() throws InterruptedException {
        File baseFile = new File(baseDir);
        String basePath = bestEffortCanonicalPath(baseFile);
        directoryWorkList.add(baseFile);
        directoriesScanned.add(basePath);
        directoriesScannedList.add(basePath);

        while (!directoryWorkList.isEmpty()) {
            File dir = directoryWorkList.removeFirst();
            if (!dir.isDirectory()) {
                continue;
            }

            File[] contentList = dir.listFiles();
            if (contentList == null) {
                continue;
            }
            for (File aContentList : contentList) {
                if (Thread.interrupted()) {
                    throw new InterruptedException();
                }

                File file = aContentList;

                if (!fileFilter.accept(file)) {
                    continue;
                }

                if (file.isDirectory()) {
                    String myPath = bestEffortCanonicalPath(file);
                    if (myPath.startsWith(basePath) && directoriesScanned.add(myPath)) {
                        directoriesScannedList.add(myPath);
                        directoryWorkList.add(file);
                    }
                } else {
                    resultList.add(file.getPath());
                }
            }
        }

        return this;
    }

    /**
     * Get an iterator over the files found by the search. The full path names
     * of the files are returned.
     */
    public Iterator fileNameIterator() {
        return resultList.iterator();
    }

    /*
     * Get List of all directories scanned.
     */
    public List getDirectoriesScanned() {
        return Collections.unmodifiableList(directoriesScannedList);
    }

}