Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * 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.
 */

public class Main {
    /**
     * Escapes a string so that it's safe for use as a file or directory name on at least FAT32
     * filesystems. FAT32 is the most restrictive of all filesystems still commonly used today.
     *
     * <p>For simplicity, this only handles common characters known to be illegal on FAT32:
     * <, >, :, ", /, \, |, ?, and *. % is also escaped since it is used as the escape character.
     * Escaping is performed in a consistent way so that no collisions occur and
     * {@link #unescapeFileName(String)} can be used to retrieve the original file name.
     *
     * @param fileName File name to be escaped.
     * @return An escaped file name which will be safe for use on at least FAT32 filesystems.
     */
    public static String escapeFileName(String fileName) {
        int length = fileName.length();
        int charactersToEscapeCount = 0;
        for (int i = 0; i < length; i++) {
            if (shouldEscapeCharacter(fileName.charAt(i))) {
                charactersToEscapeCount++;
            }
        }
        if (charactersToEscapeCount == 0) {
            return fileName;
        }

        int i = 0;
        StringBuilder builder = new StringBuilder(length + charactersToEscapeCount * 2);
        while (charactersToEscapeCount > 0) {
            char c = fileName.charAt(i++);
            if (shouldEscapeCharacter(c)) {
                builder.append('%').append(Integer.toHexString(c));
                charactersToEscapeCount--;
            } else {
                builder.append(c);
            }
        }
        if (i < length) {
            builder.append(fileName, i, length);
        }
        return builder.toString();
    }

    private static boolean shouldEscapeCharacter(char c) {
        switch (c) {
        case '<':
        case '>':
        case ':':
        case '"':
        case '/':
        case '\\':
        case '|':
        case '?':
        case '*':
        case '%':
            return true;
        default:
            return false;
        }
    }
}