Example usage for java.util List isEmpty

Introduction

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

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this list contains no elements.

Usage

From source file:com.mooing.wss.common.util.BeanUtil.java

public static <T> List<Integer> getIds(List<T> beanList) {
    if (beanList.isEmpty()) {
        return Collections.emptyList();
    }/*w  w w.ja  v  a2 s . co  m*/

    List<Integer> ids = new ArrayList<Integer>();
    Class<? extends Object> beanClass = beanList.get(0).getClass();

    try {
        Method method = beanClass.getMethod("getId");
        for (T beanObj : beanList) {
            ids.add((Integer) method.invoke(beanObj));
        }
    } catch (Exception e) {
        throw new IllegalArgumentException("Element of argument must be support getId() method");
    }

    return ids;
}

---

From source file:Main.java

/**
 * Gets the last element of the list. If the list is null or empty, null
 * is returned.//from  w  ww .j  a  va  2  s  .  c  o m
 *
 * @param   <T>
 *      The type of element in the list.
 * @param   list
 *      The list to get the last element from.
 * @return
 *      The last element from the list, if one exists. Otherwise, null.
 */
public static <T> T getLast(final List<? extends T> list) {
    if (list == null || list.isEmpty()) {
        return null;
    } else {
        return list.get(list.size() - 1);
    }
}

---

From source file:org.ambraproject.wombat.util.ReproxyUtil.java

/**
 * Apply reproxying information for a requested asset to a response.
 * <p/>/*www . j  av a2  s .c o m*/
 * The request may not support the reproxying protocol, and there may not be any reproxy URLs for the asset. In either
 * case, the response is not touched. The return value indicates this.
 * <p/>
 * Note that both {@code request} and {@code response} are for the client. Neither is for the service that reproxies
 * the asset. It is assumed that the caller has already queried the service that reproxies the asset, which provides
 * the {@code reproxyUrls} argument.
 *
 * @param request     a request from the client
 * @param response    a response to the client
 * @param reproxyUrls a list of available reproxy URLs for the requested asset (empty and {@code null} are allowed,
 *                    indicating none are available)
 * @param cacheFor    number of seconds to instruct the client to cache the reproxy information
 * @return {@code true} if the response was filled with reproxy information, in which case nothing should be written
 * to the response body; {@code false} if not, in which case the response body should be written
 */
public static boolean applyReproxy(HttpServletRequest request, HttpServletResponse response,
        List<String> reproxyUrls, int cacheFor) {
    if (reproxyUrls != null && !reproxyUrls.isEmpty() && supportsReproxy(request)) {
        response.setStatus(HttpStatus.SC_OK);
        response.setHeader(X_REPROXY_URL, REPROXY_URL_JOINER.join(reproxyUrls));
        response.setHeader(X_REPROXY_CACHE_FOR, cacheFor + "; Last-Modified Content-Type Content-Disposition");
        return true;
    }
    return false;
}

---

From source file:com.docd.purefm.commandline.CommandDu.java

public static long du_s(@NonNull final GenericFile file) {
    final List<String> result = CommandLine.executeForResult(new CommandDu(file));
    if (result == null || result.isEmpty()) {
        return 0L;
    }//from  w  ww.ja  v a2s.  c  o m
    final String res = result.get(0);
    final int resLength = res.length();
    final StringBuilder lengthString = new StringBuilder(resLength);
    for (int i = 0; i < resLength; i++) {
        final char character = res.charAt(i);
        if (Character.isDigit(character)) {
            lengthString.append(character);
        } else {
            break;
        }
    }
    try {
        return Long.parseLong(lengthString.toString()) * FileUtils.ONE_KB;
    } catch (NumberFormatException e) {
        return 0L;
    }
}

---

From source file:Main.java

public static Node getFirstMatchingChildNode(Node node, String str, String str2, List<String> list) {
    if (node == null || str == null) {
        return null;
    }/*w ww  . j a v  a2s  .  c om*/
    List matchingChildNodes = getMatchingChildNodes(node, str, str2, list);
    return (matchingChildNodes == null || matchingChildNodes.isEmpty()) ? null
            : (Node) matchingChildNodes.get(0);
}

---

From source file:org.drools.container.spring.namespace.XsdParser.java

@SuppressWarnings("unchecked")
public static void parse(Element element, ParserContext parserContext, BeanDefinitionBuilder factory) {

    List<Element> childElements = DomUtils.getChildElementsByTagName(element, "jaxb-conf");
    if (!childElements.isEmpty()) {
        Element conf = childElements.get(0);

        String systemId = conf.getAttribute(SYSTEM_ID);
        systemId = (systemId != null && systemId.trim().length() > 0) ? systemId : "xsd";

        String schemaLanguage = conf.getAttribute(SCHEMA_LANGUAGE);
        schemaLanguage = (schemaLanguage != null && schemaLanguage.trim().length() > 0) ? schemaLanguage
                : "XMLSCHEMA";

        Options options = new Options();
        options.setSchemaLanguage(Language.valueOf(schemaLanguage));

        JaxbConfiguration jaxbConf = KnowledgeBuilderFactory.newJaxbConfiguration(new Options(), systemId);

        factory.addPropertyValue("resourceConfiguration", jaxbConf);
    } else {//  w w  w. ja  va2  s .co m
        JaxbConfiguration jaxbConf = KnowledgeBuilderFactory.newJaxbConfiguration(new Options(), "xsd");

        factory.addPropertyValue("resourceConfiguration", jaxbConf);
    }
}

---

From source file:Main.java

/**
 * Calculeaza deviatia medie de la media pentru datele primite
 *
 * @param data/*w  w w.j a va 2s .com*/
 * @return deviatia medie
 */
public static double computeAverageFluctuations(List<Double> data) {
    double sum = 0;
    int index = 0;
    double media = 0;
    double max = 0;

    if (data.isEmpty()) {
        return 0;
    }

    for (Double i : data) {
        sum = sum + i;
    }

    media = sum / data.size();
    double dev = 0;

    for (Double i : data) {
        dev += Math.abs(media - i);
    }
    return dev / data.size();
}

---

From source file:Main.java

/**
 * Compares two lists. Caution: Lists can hold same values multiple times.
 * /*w  w w .j  a  va 2 s. com*/
 * @param list1
 * @param list2
 * @return -1 if no common elements or any of lists are empty/null.
 *          0 if two lists have the same contents.
 *          x (x>0) if there are x elements in common. 
 */

public static int compareLists(List<? extends Object> list1, List<? extends Object> list2) {
    if (null == list1 || null == list2 || list1.isEmpty() || list2.isEmpty()) {
        return -1;
    }

    int count = 0;

    for (Object o : list1) {
        if (list2.contains(o))
            count++;
    }

    return count;

}

---

From source file:com.acc.storefront.util.MetaSanitizerUtil.java

/**
 * Takes a List of KeywordModels and returns a comma separated list of keywords as String.
 * //w  ww. j  av  a  2s  .c  o  m
 * @param keywords
 *           List of KeywordModel objects
 * @return String of comma separated keywords
 */
public static String sanitizeKeywords(final List<KeywordModel> keywords) {
    if (keywords != null && !keywords.isEmpty()) {
        // Remove duplicates
        final Set<String> keywordSet = new HashSet<String>(keywords.size());
        for (final KeywordModel keyword : keywords) {
            keywordSet.add(keyword.getKeyword());
        }

        // Format keywords, join with comma
        final StringBuilder stringBuilder = new StringBuilder();
        for (final String keyword : keywordSet) {
            stringBuilder.append(keyword).append(',');
        }
        if (stringBuilder.length() > 0) {
            // Remove last comma
            return stringBuilder.substring(0, stringBuilder.length() - 1);
        }
    }
    return "";
}

---

From source file:com.pedra.storefront.util.MetaSanitizerUtil.java

/**
 * Takes a List of KeywordModels and returns a comma separated list of keywords as String.
 * /*from  w ww  . ja  v a  2s . com*/
 * @param keywords
 *           List of KeywordModel objects
 * @return String of comma separated keywords
 */
public static String sanitizeKeywords(final List<KeywordModel> keywords) {
    if (keywords != null && !keywords.isEmpty()) {
        // Remove duplicates
        final Set<String> keywordSet = new HashSet<String>(keywords.size());
        for (final KeywordModel kw : keywords) {
            keywordSet.add(kw.getKeyword());
        }

        // Format keywords, join with comma
        final StringBuilder stringBuilder = new StringBuilder();
        for (final String kw : keywordSet) {
            stringBuilder.append(kw).append(',');
        }
        if (stringBuilder.length() > 0) {
            // Remove last comma
            return stringBuilder.substring(0, stringBuilder.length() - 1);
        }
    }
    return "";
}

---

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