JsonPoweredTestHelper.java

/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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 util;

import org.bson.BsonDocument;
import org.bson.codecs.BsonDocumentCodec;
import org.bson.codecs.DecoderContext;
import org.bson.json.JsonReader;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.PathMatcher;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.function.Function;

import static java.nio.file.Files.isDirectory;
import static java.util.stream.Collectors.toMap;
import static org.bson.assertions.Assertions.assertNotNull;

public final class JsonPoweredTestHelper {

    public static BsonDocument getTestDocument(final File file) throws IOException {
        return new BsonDocumentCodec().decode(new JsonReader(getFileAsString(file)), DecoderContext.builder().build());
    }

    public static BsonDocument getTestDocument(final String resourcePath) throws IOException, URISyntaxException {
        return getTestDocument(new File(JsonPoweredTestHelper.class.getResource(resourcePath).toURI()));
    }

    public static Path testDir(final String resourceName) {
        URL res = JsonPoweredTestHelper.class.getResource(resourceName);
        if (res == null) {
            throw new AssertionError("Did not find " + resourceName);
        }
        try {
            Path dir = Paths.get(res.toURI());
            if (!isDirectory(dir)) {
                throw new AssertionError(dir + " is not a directory");
            }
            return dir;
        } catch (URISyntaxException e) {
            throw new RuntimeException(e);
        }
    }

    public static Map<Path, BsonDocument> testDocs(final Path dir) {
        PathMatcher jsonMatcher = FileSystems.getDefault().getPathMatcher("glob:**.json");
        try {
            return Files.list(dir)
                    .filter(jsonMatcher::matches)
                    .collect(toMap(Function.identity(), path -> {
                        try {
                            return getTestDocument(path.toFile());
                        } catch (IOException e) {
                            throw new RuntimeException(e);
                        }
                    }));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static List<File> getTestFiles(final String resourcePath) throws URISyntaxException {
        List<File> files = new ArrayList<>();

        URL resource = JsonPoweredTestHelper.class.getResource(resourcePath);
        File directory = new File(assertNotNull(resource).toExternalForm());
        addFilesFromDirectory(directory, files);

        return files;
    }

    private static String getFileAsString(final File file) throws IOException {
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        String ls = System.getProperty("line.separator");
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8))) {
            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line);
                stringBuilder.append(ls);
            }
        }
        return stringBuilder.toString();
    }

    private static void addFilesFromDirectory(final File directory, final List<File> files) {
        String[] fileNames = directory.list();
        if (fileNames != null) {
            for (String fileName : fileNames) {
                File file = new File(directory, fileName);
                if (file.isDirectory()) {
                    addFilesFromDirectory(file, files);
                } else if (file.getName().endsWith(".json")) {
                    files.add(file);
                }
            }
        }
    }

    private JsonPoweredTestHelper() {
    }
}