Example usage for java.util HashMap isEmpty

Introduction

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

Prototype

public boolean isEmpty() 

Source Link

Document

Returns true if this map contains no key-value mappings.

Usage

From source file:Main.java

public static void main(String args[]) {
    HashMap<Integer, String> newmap = new HashMap<Integer, String>();

    // populate hash map
    newmap.put(1, "tutorials");
    newmap.put(2, "from");
    newmap.put(3, "java2s.com");

    // check if map is empty
    boolean val = newmap.isEmpty();

    // check the boolean value
    System.out.println("Is hash map empty: " + val);
}

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From source file:it.univaq.incipict.profilemanager.common.utility.Utility.java

public static Profile getBestProfile(HashMap<Profile, Double> distancesMap) {
    if (distancesMap.isEmpty() || distancesMap == null)
        return null;
    // return the first element because the distances map is sorted by values
    // REF: getEuclideanDistances() method
    return distancesMap.keySet().iterator().next();
}

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From source file:org.apache.hadoop.hive.ql.optimizer.IndexUtils.java

/**
 * check that every index table contains the given partition and is fresh
 *//*from w ww . ja v a2 s. c om*/
private static boolean containsPartition(Hive hive, Partition part, List<Index> indexes) throws HiveException {
    HashMap<String, String> partSpec = part.getSpec();
    if (partSpec.isEmpty()) {
        // empty specs come from non-partitioned tables
        return isIndexTableFresh(hive, indexes, part.getTable());
    }

    for (Index index : indexes) {
        // index.getDbName() is used as a default database, which is database of target table,
        // if index.getIndexTableName() does not contain database name
        String[] qualified = Utilities.getDbTableName(index.getDbName(), index.getIndexTableName());
        Table indexTable = hive.getTable(qualified[0], qualified[1]);
        // get partitions that match the spec
        Partition matchingPartition = hive.getPartition(indexTable, partSpec, false);
        if (matchingPartition == null) {
            LOG.info("Index table " + indexTable + "did not contain built partition that matched " + partSpec);
            return false;
        } else if (!isIndexPartitionFresh(hive, index, part)) {
            return false;
        }
    }
    return true;
}

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From source file:it.univaq.incipict.profilemanager.common.utility.Utility.java

public static HashMap<Profile, Float> getPercentages(HashMap<Profile, Double> distances,
        int informationSetSize) {
    Map<Profile, Float> result = new HashMap<Profile, Float>();

    if (distances.isEmpty() || distances == null) {
        return new HashMap<Profile, Float>();
    } else {//from   www .j a  v  a2 s  .c o  m
        for (Map.Entry<Profile, Double> entry : distances.entrySet()) {
            Profile profile = entry.getKey();
            Double distance = entry.getValue();

            // Calculate the percentage for the current distance
            // The maximum distance is sqrt(informationSetSize) because we have
            // 0-1 vectors
            // REMARK: Euclidean Distance Theory
            float maxDistance = (float) Math.sqrt(informationSetSize);
            float percentage = (float) (maxDistance - distance) * 100 / maxDistance;

            // put the percentage in Map formatted with two decimals.
            result.put(profile, (float) (Math.round(percentage * 100.0) / 100.0));
        }
    }
    // return the HashMap sorted by value (DESC)
    return (HashMap<Profile, Float>) MapUtil.sortByValueDESC(result);
}

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From source file:com.github.sakserv.lslock.cli.LockListerCli.java

/**
 * Prints the final output for the locks
 *
 * @param lockDirectory     Directory to recurse for lock files
 * @throws IOException      If the lockdirectory is missing
 *///w w  w .  j a v a  2s  . co  m
public static void printLocks(File lockDirectory, HashMap<Integer, Integer> procLocksContents)
        throws IOException {

    Collection<File> fileList = FileUtils.listFiles(lockDirectory, null, true);

    // If not locks are found, output no locks found
    if (procLocksContents.isEmpty() || fileList.isEmpty()) {
        System.out.println("No locks found for " + lockDirectory);
    } else {
        // Setup the header
        System.out.printf("%-15s %-5s %n", "PID", "PATH");

        // Iterative the files and print the PID and PATH for the lock
        for (File file : fileList) {
            System.out.printf("%-15s %15s %n", procLocksContents.get(getInode(file)), file);
        }
    }
    System.out.println();
}

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From source file:es.sm2.openppm.core.plugin.PluginTemplate.java

/**
 * Load template for plugin//from w w  w.ja  v a  2 s . c  o  m
 * 
 * @param templateName
 * @param data
 * @return
 * @throws IOException
 * @throws TemplateException
 */
public static String getTemplate(String templateName, HashMap<String, Object> data)
        throws IOException, TemplateException {

    Logger log = LogManager.getLog(PluginTemplate.class);

    // Print data to logger
    if (log.isDebugEnabled()) {
        log.debug("Create Template: " + templateName);

        if (data != null && !data.isEmpty()) {

            for (String key : data.keySet()) {
                log.debug("Parameter: " + key + " Value: " + data.get(key));
            }
        }
    }

    // Load template
    InputStream stream = PluginTemplate.class.getResourceAsStream(templateName);
    String teamplate = IOUtils.toString(stream);

    // Create loader
    StringTemplateLoader stringLoader = new StringTemplateLoader();
    stringLoader.putTemplate("template", teamplate);

    // Create configuration
    Configuration cfg = new Configuration();
    cfg.setTemplateLoader(stringLoader);

    Template template = cfg.getTemplate("template");

    StringWriter writer = new StringWriter();
    template.process(data, writer);

    return writer.toString();
}

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From source file:fr.mixit.android.utils.NetworkUtils.java

static String buildParams(HashMap<String, String> args) {
    if (args != null && !args.isEmpty()) {
        final StringBuilder params = new StringBuilder();
        final Set<String> keys = args.keySet();
        for (final Iterator<String> iterator = keys.iterator(); iterator.hasNext();) {
            final String key = iterator.next();
            final String value = args.get(key);

            params.append(key);//  ww w. ja v  a 2 s .c  o  m
            params.append(EQUAL);
            params.append(value);
            if (iterator.hasNext()) {
                params.append(AND);
            }
        }

        return params.toString();
    }
    return null;
}

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From source file:org.apache.pig.impl.util.JarManager.java

public static File createPigScriptUDFJar(PigContext pigContext) throws IOException {
    File scriptUDFJarFile = File.createTempFile("PigScriptUDF", ".jar");
    // ensure the scriptUDFJarFile is deleted on exit
    scriptUDFJarFile.deleteOnExit();/*from  w  w  w  .j  a  v  a2s  .  c o  m*/
    FileOutputStream fos = new FileOutputStream(scriptUDFJarFile);
    HashMap<String, String> contents = new HashMap<String, String>();
    createPigScriptUDFJar(fos, pigContext, contents);

    if (!contents.isEmpty()) {
        FileInputStream fis = null;
        String md5 = null;
        try {
            fis = new FileInputStream(scriptUDFJarFile);
            md5 = org.apache.commons.codec.digest.DigestUtils.md5Hex(fis);
        } finally {
            if (fis != null) {
                fis.close();
            }
        }
        File newScriptUDFJarFile = new File(scriptUDFJarFile.getParent(), "PigScriptUDF-" + md5 + ".jar");
        scriptUDFJarFile.renameTo(newScriptUDFJarFile);
        return newScriptUDFJarFile;
    }
    return null;
}

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From source file:org.aselect.server.utils.Utils.java

/**
 * Serialize attributes contained in a HashMap. <br>
 * <br>// w ww  .  ja v  a  2 s. c o m
 * <b>Description:</b> <br>
 * This method serializes attributes contained in a HashMap:
 * <ul>
 * <li>They are formatted as attr1=value1&attr2=value2;...
 * <li>If a "&amp;" or a "=" appears in either the attribute name or value, they are transformed to %26 or %3d
 * respectively.
 * <li>The end result is base64 encoded.
 * </ul>
 * <br>
 * 
 * @param htAttributes - HashMap containing all attributes
 * @return Serialized representation of the attributes
 * @throws ASelectException - If serialization fails.
 */
public static String serializeAttributes(HashMap htAttributes) throws ASelectException {
    final String sMethod = "serializeAttributes";
    try {
        if (htAttributes == null || htAttributes.isEmpty())
            return null;
        StringBuffer sb = new StringBuffer();

        Set keys = htAttributes.keySet();
        for (Object s : keys) {
            String sKey = (String) s;
            // for (Enumeration e = htAttributes.keys(); e.hasMoreElements(); ) {
            // String sKey = (String)e.nextElement();
            Object oValue = htAttributes.get(sKey);

            if (oValue instanceof Vector) {// it's a multivalue attribute
                Vector vValue = (Vector) oValue;

                sKey = URLEncoder.encode(sKey + "[]", "UTF-8");
                Enumeration eEnum = vValue.elements();
                while (eEnum.hasMoreElements()) {
                    String sValue = (String) eEnum.nextElement();

                    // add: key[]=value
                    sb.append(sKey).append("=").append(URLEncoder.encode(sValue, "UTF-8"));
                    if (eEnum.hasMoreElements())
                        sb.append("&");
                }
            } else if (oValue instanceof String) {// it's a single value attribute
                String sValue = (String) oValue;
                sb.append(URLEncoder.encode(sKey, "UTF-8")).append("=")
                        .append(URLEncoder.encode(sValue, "UTF-8"));
            }

            // if (e.hasMoreElements())
            sb.append("&");
        }
        int len = sb.length();
        String result = sb.substring(0, len - 1);
        BASE64Encoder b64enc = new BASE64Encoder();
        return b64enc.encode(result.getBytes("UTF-8"));
    } catch (Exception e) {
        ASelectSystemLogger logger = ASelectSystemLogger.getHandle();
        logger.log(Level.WARNING, MODULE, sMethod, "Could not serialize attributes", e);
        throw new ASelectException(Errors.ERROR_ASELECT_INTERNAL_ERROR);
    }
}

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From source file:eu.europa.ec.fisheries.uvms.exchange.search.SearchFieldMapper.java

/**
 * Created the complete search SQL with joins and sets the values based on
 * the criterias/*from w  w w.ja  v  a 2 s .  c  o m*/
 *
 * @param criterias
 * @param dynamic
 * @return
 * @throws ParseException
 */
private static String createSearchSql(List<SearchValue> criterias, boolean dynamic) throws ParseException {

    String OPERATOR = " OR ";
    if (dynamic) {
        OPERATOR = " AND ";
    }

    StringBuilder builder = new StringBuilder();
    HashMap<ExchangeSearchField, List<SearchValue>> orderedValues = combineSearchFields(criterias);

    if (!orderedValues.isEmpty()) {

        builder.append("WHERE ");

        boolean first = true;
        for (Map.Entry<ExchangeSearchField, List<SearchValue>> criteria : orderedValues.entrySet()) {

            if (first) {
                first = false;
            } else {
                builder.append(OPERATOR);
            }

            if (criteria.getValue().size() == 1) {
                SearchValue searchValue = criteria.getValue().get(0);
                builder.append(" ( ").append(buildTableAliasname(searchValue.getField()))
                        .append(setParameter(searchValue))
                        //   .append(" OR ").append(buildTableAliasname(searchValue.getField())).append(" IS NULL ")
                        .append(" ) ");
            } else if (criteria.getValue().size() > 1) {
                builder.append(" ( ").append(buildTableAliasname(criteria.getKey())).append(" IN (:")
                        .append(criteria.getKey().getSQLReplacementToken()).append(") ")
                        // .append(" OR ").append(buildTableAliasname(criteria.getKey())).append(" IS NULL ")
                        .append(" ) ");
            }
        }
    }

    return builder.toString();
}

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