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API used in Surefire and Failsafe MOJO.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.maven.plugin.surefire.util;

import java.io.File;
import java.util.Collection;

import org.apache.maven.surefire.api.testset.TestFilter;

import static org.apache.maven.surefire.shared.utils.StringUtils.isBlank;

final class FileScanner {
    private final File basedir;

    private final String ext;

    FileScanner(File basedir, String ext) {
        this.basedir = basedir;
        ext = ext.trim();
        if (isBlank(ext)) {
            throw new IllegalArgumentException("No file extension");
        }
        this.ext = ext.startsWith(".") ? ext : "." + ext;
    }

    void scanTo(Collection scannedJavaClassNames, TestFilter filter) {
        scan(scannedJavaClassNames, filter, basedir);
    }

    private void scan(
            Collection scannedJavaClassNames,
            TestFilter filter,
            File basedir,
            String... subDirectories) {
        File[] filesAndDirs = basedir.listFiles();
        if (filesAndDirs != null) {
            final String pAckage = toJavaPackage(subDirectories);
            final String path = toPath(subDirectories);
            final String ext = this.ext;
            final boolean hasExtension = ext != null;
            final int extLength = hasExtension ? ext.length() : 0;
            for (File fileOrDir : filesAndDirs) {
                String name = fileOrDir.getName();
                if (!name.isEmpty()) {
                    if (fileOrDir.isFile()) {
                        final int clsLength = name.length() - extLength;
                        if (clsLength > 0
                                && (!hasExtension || name.regionMatches(true, clsLength, ext, 0, extLength))) {
                            String simpleClassName = hasExtension ? name.substring(0, clsLength) : name;
                            if (filter.shouldRun(toFile(path, simpleClassName), null)) {
                                String fullyQualifiedClassName =
                                        pAckage.isEmpty() ? simpleClassName : pAckage + '.' + simpleClassName;
                                scannedJavaClassNames.add(fullyQualifiedClassName);
                            }
                        }
                    } else if (fileOrDir.isDirectory()) {
                        String[] paths = new String[subDirectories.length + 1];
                        System.arraycopy(subDirectories, 0, paths, 0, subDirectories.length);
                        paths[subDirectories.length] = name;
                        scan(scannedJavaClassNames, filter, fileOrDir, paths);
                    }
                }
            }
        }
    }

    private static String toJavaPackage(String... subDirectories) {
        StringBuilder pkg = new StringBuilder();
        for (int i = 0; i < subDirectories.length; i++) {
            if (i > 0 && i < subDirectories.length) {
                pkg.append('.');
            }
            pkg.append(subDirectories[i]);
        }
        return pkg.toString();
    }

    private static String toPath(String... subDirectories) {
        StringBuilder pkg = new StringBuilder();
        for (int i = 0; i < subDirectories.length; i++) {
            if (i > 0 && i < subDirectories.length) {
                pkg.append('/');
            }
            pkg.append(subDirectories[i]);
        }
        return pkg.toString();
    }

    private String toFile(String path, String fileNameWithoutExtension) {
        String pathWithoutExtension = path.isEmpty() ? fileNameWithoutExtension : path + '/' + fileNameWithoutExtension;
        return pathWithoutExtension + ext;
    }
}