Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2013 Google Inc. 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.
 */

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    /**
     * Obtains a list of files that live in the specified directory and match the glob pattern.
     */
    public static String[] getFiles(File dir, String glob) {
        String regex = globToRegex(glob);
        final Pattern pattern = Pattern.compile(regex);
        String[] result = dir.list(new FilenameFilter() {
            @Override
            public boolean accept(File dir, String name) {
                Matcher matcher = pattern.matcher(name);
                return matcher.matches();
            }
        });
        Arrays.sort(result);

        return result;
    }

    /**
     * Converts a filename globbing pattern to a regular expression.
     * <p>
     * The regex is suitable for use by Matcher.matches(), which matches the entire string, so
     * we don't specify leading '^' or trailing '$'.
     */
    private static String globToRegex(String glob) {
        // Quick, overly-simplistic implementation -- just want to handle something simple
        // like "*.mp4".
        //
        // See e.g. http://stackoverflow.com/questions/1247772/ for a more thorough treatment.
        StringBuilder regex = new StringBuilder(glob.length());
        //regex.append('^');
        for (char ch : glob.toCharArray()) {
            switch (ch) {
            case '*':
                regex.append(".*");
                break;
            case '?':
                regex.append('.');
                break;
            case '.':
                regex.append("\\.");
                break;
            default:
                regex.append(ch);
                break;
            }
        }
        //regex.append('$');
        return regex.toString();
    }
}