com.liferay.ide.core.util.FileListing.java Source code

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Here is the source code for com.liferay.ide.core.util.FileListing.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * 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.
 */

package com.liferay.ide.core.util;

import java.io.File;
import java.io.FileNotFoundException;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.apache.commons.io.FileUtils;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;

/**
 * @author Gregory Amerson
 */
public class FileListing {

    public static List<File> getFileListing(File dir) throws FileNotFoundException {
        List<File> result = new ArrayList<>();

        File[] files = dir.listFiles();

        if (ListUtil.isEmpty(files)) {
            return Collections.emptyList();
        }

        for (File file : files) {
            result.add(file);

            if (!file.isFile()) {
                List<File> deeperList = getFileListing(file);

                result.addAll(deeperList);
            }
        }

        return result;
    }

    /**
     * Recursively walk a directory tree and return a List of all Files found; the
     * List is sorted using File.compareTo().
     *
     * @param aStartingDir
     *            is a valid directory, which can be read.
     */
    public static List<File> getFileListing(File aStartingDir, boolean sort) throws FileNotFoundException {
        _validateDirectory(aStartingDir);

        List<File> result = getFileListing(aStartingDir);

        if (sort) {
            Collections.sort(result);
        }

        return result;
    }

    public static List<IPath> getFileListing(File dir, String fileType) {
        Collection<File> files = FileUtils.listFiles(dir, new String[] { fileType }, true);

        Stream<File> stream = files.stream();

        return stream.filter(file -> file.exists()).map(file -> new Path(file.getPath()))
                .collect(Collectors.toList());
    }

    /**
     * Directory is valid if it exists, does not represent a file, and can be read.
     */
    private static void _validateDirectory(File aDirectory) throws FileNotFoundException {
        if (aDirectory == null) {
            throw new IllegalArgumentException("Directory should not be null.");
        }

        if (!aDirectory.exists()) {
            throw new FileNotFoundException("Directory does not exist: " + aDirectory);
        }

        if (!aDirectory.isDirectory()) {
            throw new IllegalArgumentException("Is not a directory: " + aDirectory);
        }

        if (!aDirectory.canRead()) {
            throw new IllegalArgumentException("Directory cannot be read: " + aDirectory);
        }
    }

}