/*
 * Copyright 2014 Monmonja. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.monmonja.library.utils;

import java.io.File;

/**
 * Created by almondjoseph on 28/2/15.
 */
public class DirectoryUtils {
    /**
     * Return the size of a directory in bytes
     */
    public static long getDirectorSize(File dir) {
        long result = 0;
        File[] fileList = dir.listFiles();

        for(int i = 0; i < fileList.length; i++) {
            // Recursive call if it's a directory
            if(fileList[i].isDirectory()) {
                result += getDirectorSize(fileList [i]);
            } else {
                // Sum the file size in bytes
                result += fileList[i].length();
            }
        }
        return result; // return the file size
    }

    public static String humanReadableByteCount(long bytes, boolean si) {
        int unit = si ? 1000 : 1024;
        if (bytes < unit) return bytes + " B";
        int exp = (int) (Math.log(bytes) / Math.log(unit));
        String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp-1) + (si ? "" : "i");
        return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
    }

    public static void deleteFolderContents(File folder) {
        File[] files = folder.listFiles();
        if (files != null) {
            for (File f : files) {
                f.delete();
            }
        }
    }
}

/*
 * Copyright 2014 Monmonja. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.monmonja.library.utils;

import java.io.File;

/**
 * Created by almondjoseph on 28/2/15.
 */
public class DirectoryUtils {
    /**
     * Return the size of a directory in bytes
     */
    public static long getDirectorSize(File dir) {
        long result = 0;
        if (dir.exists()) {
            File[] fileList = dir.listFiles();

            for (int i = 0; i < fileList.length; i++) {
                // Recursive call if it's a directory
                if (fileList[i].isDirectory()) {
                    result += getDirectorSize(fileList[i]);
                } else {
                    // Sum the file size in bytes
                    result += fileList[i].length();
                }
            }
        }

        return result; // return the file size
    }

    public static String humanReadableByteCount(long bytes, boolean si) {
        int unit = si ? 1000 : 1024;
        if (bytes < unit) return bytes + " B";
        int exp = (int) (Math.log(bytes) / Math.log(unit));
        String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp-1) + (si ? "" : "i");
        return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
    }

    public static void deleteFolderContents(File folder) {
        File[] files = folder.listFiles();
        if (files != null) {
            for (File f : files) {
                f.delete();
            }
        }
    }
}

fix bug when the file/folder is not created yet