Example usage for java.util Collection isEmpty

Introduction

In this page you can find the example usage for java.util Collection isEmpty.

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this collection contains no elements.

Usage

From source file:hrytsenko.csv.IO.java

/**
 * Saves records into CSV file./*  w  w  w.  j  a  va  2 s  .  c  o m*/
 * 
 * <p>
 * If file already exists, then it will be overridden.
 * 
 * @param args
 *            the named arguments {@link IO}.
 * 
 * @throws IOException
 *             if file could not be written.
 */
public static void save(Map<String, ?> args) throws IOException {
    Path path = getPath(args);
    LOGGER.info("Save: {}.", path.getFileName());

    @SuppressWarnings("unchecked")
    Collection<Record> records = (Collection<Record>) args.get("records");
    if (records.isEmpty()) {
        LOGGER.info("No records to save.");
        return;
    }

    try (Writer dataWriter = newBufferedWriter(path, getCharset(args), StandardOpenOption.CREATE,
            StandardOpenOption.TRUNCATE_EXISTING)) {
        Set<String> columns = new LinkedHashSet<>();
        List<Map<String, String>> rows = new ArrayList<>();
        for (Record record : records) {
            Map<String, String> values = record.values();
            columns.addAll(values.keySet());
            rows.add(values);
        }

        CsvSchema.Builder csvSchema = getSchema(args).setUseHeader(true);
        for (String column : columns) {
            csvSchema.addColumn(column);
        }
        CsvMapper csvMapper = new CsvMapper();
        ObjectWriter csvWriter = csvMapper.writer().withSchema(csvSchema.build());
        csvWriter.writeValue(dataWriter, rows);
    }
}

From source file:ipLock.ProcessHandle.java

private static String determineJavaExecutablePath() {
    File javaHome = new File(System.getProperty("java.home"));

    Collection<File> files = FileUtils.listFiles(javaHome, new NameFileFilter("java"),
            new NameFileFilter("bin"));

    if (files.isEmpty()) {
        throw new RuntimeException("No java executable found at java home '" + javaHome + "'");
    }// w w w .j a v  a  2s  .c om
    if (files.size() > 1) {
        throw new RuntimeException("Multiple java executables found at java home '" + javaHome + "': "
                + StringUtils.join(files, "; "));
    }

    return Collections.min(files).getAbsolutePath();
}

From source file:maltcms.ui.fileHandles.properties.tools.PropertyLoader.java

private static Tuple2D<Configuration, Configuration> loadPropertiesFromClass(Class<?> c) {
    PropertiesConfiguration ret = new PropertiesConfiguration();
    PropertiesConfiguration var = new PropertiesConfiguration();
    String requiredVariables = "";
    String optionalVariables = "";
    String providedVariables = "";
    Collection<String> reqVars = AnnotationInspector.getRequiredVariables(c);
    for (String rv : reqVars) {
        requiredVariables += rv + ",";
    }/*from w  w w .jav  a  2 s .c  o m*/
    if (requiredVariables.length() > 0) {
        requiredVariables = requiredVariables.substring(0, requiredVariables.length() - 1);
    }
    var.setProperty(REQUIRED_VARS, requiredVariables);

    Collection<String> optVars = AnnotationInspector.getOptionalRequiredVariables(c);
    for (String rv : optVars) {
        optionalVariables += rv + ",";
    }
    if (optionalVariables.length() > 0) {
        optionalVariables = optionalVariables.substring(0, optionalVariables.length() - 1);
    }
    var.setProperty(OPTIONAL_VARS, optionalVariables);

    Collection<String> provVars = AnnotationInspector.getProvidedVariables(c);
    for (String rv : provVars) {
        providedVariables += rv + ",";
    }
    if (providedVariables.length() > 0) {
        providedVariables = providedVariables.substring(0, providedVariables.length() - 1);
    }
    var.setProperty(PROVIDED_VARS, providedVariables);

    Collection<String> keys = AnnotationInspector.getRequiredConfigKeys(c);
    if (!keys.isEmpty()) {
        for (String key : keys) {
            ret.setProperty(key, AnnotationInspector.getDefaultValueFor(c, key));
        }
    }
    return new Tuple2D<Configuration, Configuration>(ret, var);
}

From source file:com.mtgi.analytics.servlet.BehaviorTrackingListener.java

private static void addRequestAdapters(Collection<ServletRequestBehaviorTrackingAdapter> accum,
        ListableBeanFactory beanFactory, boolean hasFilter) {
    @SuppressWarnings("unchecked")
    Collection<ServletRequestBehaviorTrackingAdapter> beans = beanFactory
            .getBeansOfType(ServletRequestBehaviorTrackingAdapter.class, false, false).values();
    if (!beans.isEmpty()) {
        if (hasFilter)
            throw new IllegalStateException(
                    "You have configured both BehaviorTrackingFilters and BehaviorTrackingListeners in the same web application.  Only one of these methods may be used in a single application.");
        accum.addAll(beans);// w  w w  .  j a  v a  2s.co m
    }
}

From source file:com.centeractive.ws.builder.DefinitionSaveTest.java

public static File findFile(File folder, String name) {
    final boolean RECURSIVE = true;
    String[] extensions = new String[] { FilenameUtils.getExtension(name) };
    Collection<File> files = FileUtils.listFiles(folder, extensions, RECURSIVE);
    if (files.isEmpty() == false) {
        return files.iterator().next();
    }/*www  .  j  a  v  a  2s.  c  o m*/
    throw new RuntimeException("File not found " + name);
}

From source file:ru.org.linux.tag.TagService.java

public static String toString(Collection<String> tags) {
    if (tags.isEmpty()) {
        return "";
    }/* ww w . j a  v  a  2  s .  com*/

    StringBuilder str = new StringBuilder();

    for (String tag : tags) {
        str.append(str.length() > 0 ? "," : "").append(tag);
    }

    return str.toString();
}

From source file:de.pawlidi.openaletheia.generator.KeyGenerator.java

public static String readKeyFile(final String directory, final boolean privateKeyFile) {
    if (!StringUtils.isBlank(directory)) {
        File rootDir = new File(directory);
        if (rootDir.exists() && rootDir.isDirectory()) {
            Collection<File> files = FileUtils.listFiles(rootDir, new String[] { KEY_FILE_EXTENSION }, false);
            if (!files.isEmpty()) {
                for (File file : files) {
                    if (file.getName().endsWith((privateKeyFile ? PRIVATE_KEY_FILE : PUBLIC_KEY_FILE))) {
                        try {
                            return FileUtils.readFileToString(file, Converter.UTF_8);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }//w  w w . j  a  v a  2s  .  c  o m
                    }
                }

            }
        }
    }
    return null;
}

From source file:br.com.suricattus.surispring.spring.security.util.SecurityUtil.java

/**
 * List user authorities./*  w w w .  j a va 2s .c  om*/
 *  
 * @return user authorities
 */
@SuppressWarnings("unchecked")
public static Set<String> getUserAuthorities() {
    if (SecurityContextHolder.getContext() == null)
        return Collections.EMPTY_SET;

    Authentication currentUser = SecurityContextHolder.getContext().getAuthentication();
    if (currentUser == null)
        return Collections.EMPTY_SET;

    Collection<? extends GrantedAuthority> grantedAauthorities = currentUser.getAuthorities();
    if (grantedAauthorities == null || grantedAauthorities.isEmpty())
        return Collections.EMPTY_SET;

    Set<String> authorities = new TreeSet<String>();
    for (GrantedAuthority ga : grantedAauthorities)
        authorities.add(ga.getAuthority());
    return authorities;
}

From source file:net.ontopia.utils.TestFileUtils.java

public static List<String[]> getTestInputFiles(ResourcesDirectoryReader directoryReader,
        String resourcesDirectory) {
    Collection<String> resources = directoryReader.getResourcesAsStrings();
    if (resources.isEmpty())
        throw new RuntimeException("No resources found in directory " + resourcesDirectory);
    List<String[]> tests = new ArrayList<String[]>();
    for (String resource : resources) {
        int slashPos = resource.lastIndexOf('/') + 1;
        String root = resource.substring(0, slashPos);
        String filename = resource.substring(slashPos);
        tests.add(new String[] { root, filename });
    }/*from   w  ww.  jav a 2s  .c om*/
    return tests;
}

From source file:com.acc.storefront.tags.Functions.java

/**
 * JSP EL Function to get a primary Image for a Product in a specific format
 * /*ww w.  ja va2s  . c  o m*/
 * @param product
 *           the product
 * @param format
 *           the desired format
 * @return the image
 */
public static ImageData getPrimaryImageForProductAndFormat(final ProductData product, final String format) {
    if (product != null && format != null) {
        final Collection<ImageData> images = product.getImages();
        if (images != null && !images.isEmpty()) {
            for (final ImageData image : images) {
                if (ImageDataType.PRIMARY.equals(image.getImageType()) && format.equals(image.getFormat())) {
                    return image;
                }
            }
        }
    }
    return null;
}