Example usage for java.util Collections EMPTY_SET

Introduction

In this page you can find the example usage for java.util Collections EMPTY_SET.

Prototype

Set EMPTY_SET

To view the source code for java.util Collections EMPTY_SET.

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Document

The empty set (immutable).

Usage

From source file:Main.java

public static void main(String args[]) {
    List list = Collections.EMPTY_LIST;
    Set set = Collections.EMPTY_SET;
    Map map = Collections.EMPTY_MAP;

    List<String> s = Collections.emptyList();
    Set<Long> l = Collections.emptySet();
    Map<Date, String> d = Collections.emptyMap();
}

---

From source file:org.apache.openejb.server.Main.java

public static void main(String args[]) throws SystemExitException {
    CommandLineParser parser = new PosixParser();

    // create the Options
    Options options = new Options();
    options.addOption(option("v", "version", "cmd.start.opt.version"));
    options.addOption(option("h", "help", "cmd.start.opt.help"));
    options.addOption(option(null, "conf", "file", "cmd.start.opt.conf"));
    options.addOption(option(null, "local-copy", "boolean", "cmd.start.opt.localCopy"));
    options.addOption(option(null, "examples", "cmd.start.opt.examples"));

    ResourceFinder finder = new ResourceFinder("META-INF/");

    Set<String> services = null;
    try {//from  ww w  . ja  v  a  2s . c om
        Map<String, Properties> serviceEntries = finder.mapAvailableProperties(ServerService.class.getName());
        services = serviceEntries.keySet();
        for (String service : services) {
            options.addOption(option(null, service + "-port", "int", "cmd.start.opt.port", service));
            options.addOption(option(null, service + "-bind", "host", "cmd.start.opt.bind", service));
        }
    } catch (Exception e) {
        services = Collections.EMPTY_SET;
    }

    CommandLine line = null;
    try {
        // parse the command line arguments
        line = parser.parse(options, args);
    } catch (ParseException exp) {
        help(options);
        throw new SystemExitException(-1);
    }

    if (line.hasOption("help")) {
        help(options);
        return;
    } else if (line.hasOption("version")) {
        OpenEjbVersion.get().print(System.out);
        return;
    } else if (line.hasOption("examples")) {
        try {
            String text = finder.findString("org.apache.openejb.cli/start.examples");
            System.out.println(text);
            return;
        } catch (Exception e) {
            System.err.println("Unable to print examples:");
            e.printStackTrace(System.err);
            throw new SystemExitException(-2);
        }
    }

    Properties props = SystemInstance.get().getProperties();

    if (line.hasOption("conf")) {
        props.setProperty("openejb.configuration", line.getOptionValue("conf"));
    } else if (line.hasOption("local-copy")) {
        String value = line.getOptionValue("local-copy");
        if (value.equalsIgnoreCase("false") || value.equalsIgnoreCase("no") || value.equalsIgnoreCase("off")) {
            props.setProperty("openejb.localcopy", "false");
        } else {
            props.setProperty("openejb.localcopy", "true");
        }
    }

    for (String service : services) {
        String[] opts = { "port", "bind" };
        for (String opt : opts) {
            String option = service + "-" + opt;
            if (line.hasOption(option)) {
                props.setProperty(service + "." + opt, line.getOptionValue(option));
            }
        }
    }

    try {
        final SystemInstance system = SystemInstance.get();
        File libs = system.getHome().getDirectory("lib");
        system.getClassPath().addJarsToPath(libs);
        initServer(system);
    } catch (DontStartServerException ignored) {
    } catch (Exception e) {
        e.printStackTrace();
    }
}

---

From source file:edu.cmu.tetrad.cli.search.FgsCli.java

/**
 * @param args the command line arguments
 *///from  ww  w . j  a v a 2s  .c o  m
public static void main(String[] args) {
    if (args == null || args.length == 0 || Args.hasLongOption(args, "help")) {
        Args.showHelp("fgs", MAIN_OPTIONS);
        return;
    }

    parseArgs(args);

    System.out.println("================================================================================");
    System.out.printf("FGS Discrete (%s)%n", DateTime.printNow());
    System.out.println("================================================================================");

    String argInfo = createArgsInfo();
    System.out.println(argInfo);
    LOGGER.info("=== Starting FGS Discrete: " + Args.toString(args, ' '));
    LOGGER.info(argInfo.trim().replaceAll("\n", ",").replaceAll(" = ", "="));

    Set<String> excludedVariables = (excludedVariableFile == null) ? Collections.EMPTY_SET
            : getExcludedVariables();

    runPreDataValidations(excludedVariables, System.err);
    DataSet dataSet = readInDataSet(excludedVariables);
    runOptionalDataValidations(dataSet, System.err);

    Path outputFile = Paths.get(dirOut.toString(), outputPrefix + ".txt");
    try (PrintStream writer = new PrintStream(
            new BufferedOutputStream(Files.newOutputStream(outputFile, StandardOpenOption.CREATE)))) {
        String runInfo = createOutputRunInfo(excludedVariables, dataSet);
        writer.println(runInfo);
        String[] infos = runInfo.trim().replaceAll("\n\n", ";").split(";");
        for (String s : infos) {
            LOGGER.info(s.trim().replaceAll("\n", ",").replaceAll(":,", ":").replaceAll(" = ", "="));
        }

        Graph graph = runFgs(dataSet, writer);

        writer.println();
        writer.println(graph.toString());
    } catch (IOException exception) {
        LOGGER.error("FGS failed.", exception);
        System.err.printf("%s: FGS failed.%n", DateTime.printNow());
        System.out.println("Please see log file for more information.");
        System.exit(-128);
    }
    System.out.printf("%s: FGS finished!  Please see %s for details.%n", DateTime.printNow(),
            outputFile.getFileName().toString());
    LOGGER.info(
            String.format("FGS finished!  Please see %s for details.", outputFile.getFileName().toString()));
}

---

From source file:edu.cmu.tetrad.cli.search.FgsDiscrete.java

/**
 * @param args the command line arguments
 *//*ww w. java 2  s.c  o m*/
public static void main(String[] args) {
    if (args == null || args.length == 0 || Args.hasLongOption(args, "help")) {
        Args.showHelp("fgs-discrete", MAIN_OPTIONS);
        return;
    }

    parseArgs(args);

    System.out.println("================================================================================");
    System.out.printf("FGS Discrete (%s)%n", DateTime.printNow());
    System.out.println("================================================================================");

    String argInfo = createArgsInfo();
    System.out.println(argInfo);
    LOGGER.info("=== Starting FGS Discrete: " + Args.toString(args, ' '));
    LOGGER.info(argInfo.trim().replaceAll("\n", ",").replaceAll(" = ", "="));

    Set<String> excludedVariables = (excludedVariableFile == null) ? Collections.EMPTY_SET
            : getExcludedVariables();

    runPreDataValidations(excludedVariables, System.err);

    DataSet dataSet = readInDataSet(excludedVariables);

    runOptionalDataValidations(dataSet, System.err);

    Path outputFile = Paths.get(dirOut.toString(), outputPrefix + ".txt");
    try (PrintStream writer = new PrintStream(
            new BufferedOutputStream(Files.newOutputStream(outputFile, StandardOpenOption.CREATE)))) {
        String runInfo = createOutputRunInfo(excludedVariables, dataSet);
        writer.println(runInfo);
        String[] infos = runInfo.trim().replaceAll("\n\n", ";").split(";");
        for (String s : infos) {
            LOGGER.info(s.trim().replaceAll("\n", ",").replaceAll(":,", ":").replaceAll(" = ", "="));
        }

        Graph graph = runFgsDiscrete(dataSet, writer);

        writer.println();
        writer.println(graph.toString());

        if (graphML) {
            writeOutGraphML(graph, Paths.get(dirOut.toString(), outputPrefix + "_graph.txt"));
        }
    } catch (IOException exception) {
        LOGGER.error("FGS Discrete failed.", exception);
        System.err.printf("%s: FGS Discrete failed.%n", DateTime.printNow());
        System.out.println("Please see log file for more information.");
        System.exit(-128);
    }
    System.out.printf("%s: FGS Discrete finished!  Please see %s for details.%n", DateTime.printNow(),
            outputFile.getFileName().toString());
    LOGGER.info(String.format("FGS Discrete finished!  Please see %s for details.",
            outputFile.getFileName().toString()));
}

---

From source file:Main.java

public static Set getMy() {
    String nullFlag = null;//from w  w w  . j  a v  a2  s. c  om
    if (nullFlag == null) {
        return Collections.EMPTY_SET;
    }
    return null;
}

---

From source file:Main.java

/**
 * byte[] convert to set// w w  w  . j  a va  2 s  .  c o  m
 */
public static Set<String> byteConvertToSet(byte[] blob, String separate) {
    if (blob == null) {
        return null;
    }
    if (blob.length == 0) {
        return Collections.EMPTY_SET;
    }
    String sp = TextUtils.isEmpty(separate) ? COMMA : separate;
    String values = new String(blob);
    String[] sV = values.split(sp);
    Set<String> set = new HashSet<>();
    for (String v : sV) {
        set.add(v);
    }
    return set;
}

---

From source file:Main.java

/**
 * string convert to set//ww w . ja  v a 2  s.  com
 */
public static Set<String> stringConvertToSet(String values, String separate) {
    if (values == null) {
        return null;
    }
    if (values.isEmpty()) {
        return Collections.EMPTY_SET;
    }
    String sp = TextUtils.isEmpty(separate) ? COMMA : separate;
    String[] sV = values.split(sp);
    Set<String> set = new HashSet<>();
    for (String v : sV) {
        set.add(v);
    }
    return set;
}

---

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> Set<T> emptySet(Class<T> type) {
    return Collections.EMPTY_SET;
}

---

From source file:Main.java

@SuppressWarnings({ "unchecked" })
public static <E> Set<E> asSet(E... elements) {
    if (elements == null || elements.length == 0) {
        return Collections.EMPTY_SET;
    }/*  www.j a v  a 2  s. co  m*/
    LinkedHashSet<E> set = new LinkedHashSet<E>(elements.length * 4 / 3 + 1);
    Collections.addAll(set, elements);
    return set;
}

---

From source file:Main.java

/**
 * Simple method that just returns <code>Collections.EMPTY_SET</code>.
 * This exists to enable type-safe empty collections so other locations in JSecurity code
 * do not need to worry about suppressing warnings.
 *
 * @param clazz the class of the collection type to return
 * @return an empty collection//from  w w w .  j  a  v  a2  s  .co m
 */
@SuppressWarnings({ "unchecked" })
public static <E> Collection<E> emptyCollection(Class<E> clazz) {
    return Collections.EMPTY_SET;
}

---

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