org.sonar.plugins.dotnet.tests.WildcardPatternFileProvider.java Source code

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Here is the source code for org.sonar.plugins.dotnet.tests.WildcardPatternFileProvider.java

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/*
 * SonarQube .NET Tests Library
 * Copyright (C) 2014-2017 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program 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 3 of the License, or (at your option) any later version.
 *
 * This program 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.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.plugins.dotnet.tests;

import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import org.sonar.api.utils.WildcardPattern;

import java.io.File;
import java.util.List;
import java.util.Set;

public class WildcardPatternFileProvider {

    private static final String CURRENT_FOLDER = ".";
    private static final String PARENT_FOLDER = "..";

    private static final String RECURSIVE_PATTERN = "**";
    private static final String ZERO_OR_MORE_PATTERN = "*";
    private static final String ANY_PATTERN = "?";

    private final File baseDir;
    private final String directorySeparator;

    public WildcardPatternFileProvider(File baseDir, String directorySeparator) {
        this.baseDir = baseDir;
        this.directorySeparator = directorySeparator;
    }

    Set<File> listFiles(String pattern) {
        List<String> elements = ImmutableList.copyOf(Splitter.on(directorySeparator).split(pattern));

        List<String> elementsTillFirstWildcard = elementsTillFirstWildcard(elements);
        String pathTillFirstWildcardElement = toPath(elementsTillFirstWildcard);
        File fileTillFirstWildcardElement = new File(pathTillFirstWildcardElement);

        File absoluteFileTillFirstWildcardElement = fileTillFirstWildcardElement.isAbsolute()
                ? fileTillFirstWildcardElement
                : new File(baseDir, pathTillFirstWildcardElement);

        List<String> wildcardElements = elements.subList(elementsTillFirstWildcard.size(), elements.size());
        if (wildcardElements.isEmpty()) {
            return absoluteFileTillFirstWildcardElement.exists()
                    ? ImmutableSet.of(absoluteFileTillFirstWildcardElement)
                    : ImmutableSet.<File>of();
        }
        checkNoCurrentOrParentFolderAccess(wildcardElements);

        WildcardPattern wildcardPattern = WildcardPattern.create(toPath(wildcardElements), directorySeparator);

        ImmutableSet.Builder<File> builder = ImmutableSet.builder();
        for (File file : listFiles(absoluteFileTillFirstWildcardElement)) {
            String relativePath = relativize(absoluteFileTillFirstWildcardElement, file);

            if (wildcardPattern.match(relativePath)) {
                builder.add(file);
            }
        }

        return builder.build();
    }

    private String toPath(List<String> elements) {
        return Joiner.on(directorySeparator).join(elements);
    }

    private static List<String> elementsTillFirstWildcard(List<String> elements) {
        ImmutableList.Builder<String> builder = ImmutableList.builder();
        for (String element : elements) {
            if (containsWildcard(element)) {
                break;
            }
            builder.add(element);
        }
        return builder.build();
    }

    private static void checkNoCurrentOrParentFolderAccess(List<String> elements) {
        for (String element : elements) {
            if (isCurrentOrParentFolder(element)) {
                throw new IllegalArgumentException("Cannot contain '" + CURRENT_FOLDER + "' or '" + PARENT_FOLDER
                        + "' after the first wildcard.");
            }
        }
    }

    private static boolean containsWildcard(String element) {
        return RECURSIVE_PATTERN.equals(element) || element.contains(ZERO_OR_MORE_PATTERN)
                || element.contains(ANY_PATTERN);
    }

    private static boolean isCurrentOrParentFolder(String element) {
        return CURRENT_FOLDER.equals(element) || PARENT_FOLDER.equals(element);
    }

    private static Set<File> listFiles(File dir) {
        ImmutableSet.Builder<File> builder = ImmutableSet.builder();
        listFiles(builder, dir);
        return builder.build();
    }

    private static void listFiles(ImmutableSet.Builder<File> builder, File dir) {
        File[] files = dir.listFiles();
        if (files != null) {
            builder.add(files);

            for (File file : files) {
                if (file.isDirectory()) {
                    listFiles(builder, file);
                }
            }
        }
    }

    private static String relativize(File parent, File file) {
        return file.getAbsolutePath().substring(parent.getAbsolutePath().length() + 1);
    }

}