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:Main.java

/**
 * @param collectionOfCollection/*from ww  w  .  ja va2 s . c  o m*/
 *            a Collection&lt;Collection&lt;T>>
 * 
 * @return a Set&lt;T> containing all values of all Collections&lt;T>
 *         without any duplicates
 */
public static <T> Set<T> unionOfListOfLists(final Collection<? extends Collection<T>> collectionOfCollection) {
    if (collectionOfCollection == null || collectionOfCollection.isEmpty()) {
        return new HashSet<T>(0);
    }
    final HashSet<T> union = new HashSet<T>();
    for (final Collection<T> col : collectionOfCollection) {
        if (col != null) {
            for (final T t : col) {
                if (t != null) {
                    union.add(t);
                }
            }
        }
    }
    return union;
}

From source file:annis.sqlgen.SqlConstraints.java

public static String in(String lhs, Collection<?> values) {
    if (values.isEmpty()) {
        return in(lhs, "NULL");
    } else {// w  ww  .j a  v a2  s. c o m
        return in(lhs, StringUtils.join(values, ","));
    }
}

From source file:com.nwtx.manager.common.utils.Collections3.java

/**
 * ?./*  w  ww  .  j a  va2s  .c  o m*/
 */
public static boolean isEmpty(Collection<?> collection) {
    return (collection == null) || collection.isEmpty();
}

From source file:de.hybris.platform.acceleratorstorefrontcommons.util.MetaSanitizerUtil.java

/**
 * Takes a List of keyword Strings and returns a comma separated list of keywords as String.
 *
 * @param keywords//from w ww  .  j  a  v  a 2  s.c om
 *           List of KeywordModel objects
 * @return String of comma separated keywords
 */
public static String sanitizeKeywords(final Collection<String> keywords) {
    if (keywords != null && !keywords.isEmpty()) {
        // Remove duplicates
        final Set<String> keywordSet = new HashSet<String>(keywords);

        // 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.nwtx.manager.common.utils.Collections3.java

/**
 * ?./*from   w  ww. jav  a2  s .  c o m*/
 */
public static boolean isNotEmpty(Collection<?> collection) {
    return (collection != null) && !(collection.isEmpty());
}

From source file:com.streamsets.pipeline.stage.destination.mapreduce.MapreduceUtils.java

private static void appendJars(Configuration conf, Collection<String> appendJars) {
    if (appendJars.isEmpty()) {
        return;// w w  w  .  ja v a2  s .  com
    }

    String addition = StringUtils.join(appendJars, JAR_SEPARATOR);

    // Get previously configured jars (if any)
    String tmpjars = conf.get(TMP_JARS_PROPERTY);
    tmpjars = StringUtils.isEmpty(tmpjars) ? addition : tmpjars + JAR_SEPARATOR + addition;

    conf.set(TMP_JARS_PROPERTY, tmpjars);
}

From source file:adalid.commons.util.ColUtils.java

public static <T> Collection<T> filter(Collection<T> collection, Predicate predicate) {
    if (collection == null || collection.isEmpty() || predicate == null) {
        return collection;
    } else {//from   w  w w. j  a  v a2s  . c  om
        //          Collection<T> list = new ArrayList<T>();
        //          list.addAll(collection);
        Collection<T> list = new ArrayList<>(collection);
        CollectionUtils.filter(list, predicate);
        return list;
    }
}

From source file:de.tu_berlin.dima.oligos.db.DbUtils.java

public static DenseSchema sparseToDenseSchema(SparseSchema sparseSchema, JdbcConnector connector)
        throws SQLException {
    DenseSchema denseSchema = new DenseSchema();
    for (String schema : sparseSchema.schemas()) {
        Collection<String> tables = sparseSchema.tablesIn(schema);
        if (tables.isEmpty()) {
            tables = connector.getTables(schema);
        }/*from ww  w.  j a  v a  2  s.  c  o m*/
        for (String table : tables) {
            Collection<String> columns = sparseSchema.columnsIn(schema, table);
            if (columns.isEmpty()) {
                columns = connector.getColumns(schema, table);
            }
            for (String column : columns) {
                denseSchema.addColumn(new ColumnId(schema, table, column));
            }
        }
    }
    return denseSchema;
}

From source file:adalid.commons.util.ColUtils.java

public static <T> Collection<T> allFilter(Collection<T> collection, Predicate... predicates) {
    if (collection == null || collection.isEmpty() || predicates == null) {
        return collection;
    } else {/*from  ww  w .  ja v  a 2  s  . c  o  m*/
        //          Collection<T> list = new ArrayList<T>();
        //          list.addAll(collection);
        Collection<T> list = new ArrayList<>(collection);
        Predicate predicate = PredicateUtils.allPredicate(predicates);
        CollectionUtils.filter(list, predicate);
        return list;
    }
}

From source file:adalid.commons.util.ColUtils.java

public static <T> Collection<T> anyFilter(Collection<T> collection, Predicate... predicates) {
    if (collection == null || collection.isEmpty() || predicates == null) {
        return collection;
    } else {/* ww  w  . j a  v  a 2s .  com*/
        //          Collection<T> list = new ArrayList<T>();
        //          list.addAll(collection);
        Collection<T> list = new ArrayList<>(collection);
        Predicate predicate = PredicateUtils.anyPredicate(predicates);
        CollectionUtils.filter(list, predicate);
        return list;
    }
}