Example usage for java.util.stream Collectors joining

Introduction

In this page you can find the example usage for java.util.stream Collectors joining.

Prototype

public static Collector<CharSequence, ?, String> joining(CharSequence delimiter, CharSequence prefix,
        CharSequence suffix) 

Source Link

Document

Returns a Collector that concatenates the input elements, separated by the specified delimiter, with the specified prefix and suffix, in encounter order.

Usage

From source file:Main.java

public static void main(String[] args) {
    Stream<String> s = Stream.of("a", "b", "c");

    String names = s.collect(Collectors.joining(", ", "Hello ", ". Goodbye."));

    System.out.println(names);/*  w  w  w .j  a  va 2 s. c  o m*/
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    List<Person> persons = Arrays.asList(new Person("Max", 18), new Person("Peter", 23),
            new Person("Pamela", 23), new Person("David", 12));

    String names = persons.stream().filter(p -> p.age >= 18).map(p -> p.name)
            .collect(Collectors.joining(" and ", "In Germany ", " are of legal age."));

    System.out.println(names);//from   w  w w.ja  v a2 s . c o  m
}

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From source file:edu.mit.lib.mama.Mama.java

public static void main(String[] args) {

    Properties props = findConfig(args);
    DBI dbi = new DBI(props.getProperty("dburl"), props);
    // Advanced instrumentation/metrics if requested
    if (System.getenv("MAMA_DB_METRICS") != null) {
        dbi.setTimingCollector(new InstrumentedTimingCollector(metrics));
    }//from  ww  w .  j a  va 2s .c  om
    // reassign default port 4567
    if (System.getenv("MAMA_SVC_PORT") != null) {
        port(Integer.valueOf(System.getenv("MAMA_SVC_PORT")));
    }
    // if API key given, use exception monitoring service
    if (System.getenv("HONEYBADGER_API_KEY") != null) {
        reporter = new HoneybadgerReporter();
    }

    get("/ping", (req, res) -> {
        res.type("text/plain");
        res.header("Cache-Control", "must-revalidate,no-cache,no-store");
        return "pong";
    });

    get("/metrics", (req, res) -> {
        res.type("application/json");
        res.header("Cache-Control", "must-revalidate,no-cache,no-store");
        ObjectMapper objectMapper = new ObjectMapper()
                .registerModule(new MetricsModule(TimeUnit.SECONDS, TimeUnit.MILLISECONDS, true));
        try (ServletOutputStream outputStream = res.raw().getOutputStream()) {
            objectMapper.writer().withDefaultPrettyPrinter().writeValue(outputStream, metrics);
        }
        return "";
    });

    get("/shutdown", (req, res) -> {
        boolean auth = false;
        try {
            if (!isNullOrEmpty(System.getenv("MAMA_SHUTDOWN_KEY")) && !isNullOrEmpty(req.queryParams("key"))
                    && System.getenv("MAMA_SHUTDOWN_KEY").equals(req.queryParams("key"))) {
                auth = true;
                return "Shutting down";
            } else {
                res.status(401);
                return "Not authorized";
            }
        } finally {
            if (auth) {
                stop();
            }
        }
    });

    get("/item", (req, res) -> {
        if (isNullOrEmpty(req.queryParams("qf")) || isNullOrEmpty(req.queryParams("qv"))) {
            halt(400, "Must supply field and value query parameters 'qf' and 'qv'");
        }
        itemReqs.mark();
        Timer.Context context = respTime.time();
        try (Handle hdl = dbi.open()) {
            if (findFieldId(hdl, req.queryParams("qf")) != -1) {
                List<String> results = findItems(hdl, req.queryParams("qf"), req.queryParams("qv"),
                        req.queryParamsValues("rf"));
                if (results.size() > 0) {
                    res.type("application/json");
                    return "{ " + jsonValue("field", req.queryParams("qf"), true) + ",\n"
                            + jsonValue("value", req.queryParams("qv"), true) + ",\n" + jsonValue("items",
                                    results.stream().collect(Collectors.joining(",", "[", "]")), false)
                            + "\n" + " }";
                } else {
                    res.status(404);
                    return "No items found for: " + req.queryParams("qf") + "::" + req.queryParams("qv");
                }
            } else {
                res.status(404);
                return "No such field: " + req.queryParams("qf");
            }
        } catch (Exception e) {
            if (null != reporter)
                reporter.reportError(e);
            res.status(500);
            return "Internal system error: " + e.getMessage();
        } finally {
            context.stop();
        }
    });

    awaitInitialization();
}

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From source file:Main.java

public static String collectionToString(Collection<?> collection) {
    return collection.stream().map(String::valueOf).collect(Collectors.joining(",", "(", ")"));
}

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From source file:devbury.dewey.plugins.help.Help.java

@Override
public void onEvent(MessageEvent event) {
    Message message = event.getMessage();
    if (message.isCommand()) {
        if ("help".equals(message.getCommand())) {
            String response = usages.stream().flatMap(hp -> hp.usageSummary().getCommands().stream()).distinct()
                    .collect(Collectors.joining(", ", "I know about these commands: ", ""));

            chatServer.respondToMessage(message, response);
        } else {//  w w w.ja  v  a2  s  .co  m
            Matcher matcher = pattern.matcher(message.getCommand());
            if (matcher.matches()) {
                String command = matcher.group(1);
                String args = matcher.group(2);
                usages.stream().filter(hp -> hp.usageSummary().getCommands().contains(command))
                        .forEach(hp -> chatServer.respondToMessage(message,
                                hp.usageSummary().getTitle() + "\n" + hp.usageDetails(command, args)));
            }
        }
    }
}

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From source file:devbury.dewey.hipchat.HipChatSettings.java

@PostConstruct
public void checkProperties() {
    Assert.hasText(email, "hipchat.email is not set!");
    Assert.hasText(password, "hipchat.password is not set!");
    Assert.hasText(apiToken, "hipchat.apiToken is not set!");
    if (!groupsToJoin.isEmpty()) {
        logger.info("{}", groupsToJoin.stream().collect(Collectors.joining(", ", "Only joining groups: ", "")));
    }//from  w  w w.  java2 s  .co m
}

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From source file:io.github.jeddict.jcode.util.PersistenceUtil.java

public static void addProperty(PersistenceUnit punit, String key, String value) {
    Properties properties = punit.getProperties();
    if (properties == null) {
        properties = punit.newProperties();
        punit.setProperties(properties);
    }// ww  w  . j av  a 2  s.  c  om
    Property property = properties.newProperty();
    property.setName(key);
    property.setValue(value);

    Property existing = getProperty(properties.getProperty2(), key);

    if (existing != null) {
        existing.setValue(property.getValue());
    } else {
        properties.addProperty2(property);
    }
    System.out.println(Arrays.stream(punit.getProperties().getProperty2())
            .map(p -> p.getName() + '.' + p.getValue()).collect(Collectors.joining("|", "<", ">")));
}

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From source file:net.jodah.failsafe.internal.actions.DoThrowAction.java

@Override
public String currentToString() {
    synchronized (current) {
        return current.stream().map(Object::toString).collect(Collectors.joining(",", name + "(", ") at "))
                + getDefinitionInfo();/*from w  ww.ja  v  a 2 s .  co  m*/
    }
}

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From source file:ru.xxlabaza.popa.template.TemplaterFacade.java

private String bindingsToString(Map<String, Object> map) {
    if (map == null || map.isEmpty()) {
        return "{}";
    }/*from ww w.  ja va 2  s .  co m*/

    return map.entrySet().stream().map(entry -> {
        StringBuilder sb = new StringBuilder();
        sb.append(entry.getKey()).append('=');

        Object value = entry.getValue();
        if (value == null) {
            sb.append("");
        } else {
            String valueString = value.toString().replaceAll("\\r\\n|\\r|\\n", " ");
            if (sb.length() + valueString.length() > 80) {
                sb.append(valueString.substring(0, 80 - (sb.length() + 5))).append("...");
            } else {
                sb.append(valueString);
            }
        }
        return sb.toString();
    }).collect(Collectors.joining(",\n  ", "\n{\n  ", "\n}"));
}

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From source file:net.jodah.failsafe.internal.actions.DoThrowAction.java

@Override
public String toString() {
    return arguments.stream().map(Object::toString).collect(Collectors.joining(",", name + "(", ")"));
}

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