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

public static boolean isEmpty(final Collection<?> collection) {
    if (null == collection) {
        return true;
    } else {//from   w w  w . ja  va 2s .c o  m
        return collection.isEmpty();
    }
}

From source file:Main.java

public static <T> T getObjInList(Class<T> clazz, Collection<T> all, String valueStr, String propName)
        throws Exception {
    if (all.isEmpty() || valueStr == null) {
        return null;
    }// w  w  w. j  a  va  2  s.c  om
    T obj = null;
    Iterator<T> iter = all.iterator();
    for (; iter.hasNext();) {
        T temp = iter.next();
        Object match = null;
        if (propName == null) {
            match = temp.toString();
        } else {
            Field field = clazz.getField(propName);
            field.setAccessible(true);
            match = field.get(temp);
        }
        if (valueStr.equals(match)) {
            obj = temp;
            break;
        }
    }
    return obj;
}

From source file:fi.hsl.parkandride.core.service.PasswordValidator.java

public static void validate(String password) {
    Collection<Violation> violations = new ArrayList<>();
    validate(password, violations);/*from w  ww .j a  va2 s . c  o  m*/
    if (!violations.isEmpty()) {
        throw new ValidationException(violations);
    }
}

From source file:Main.java

public static String[][] returnTable(Collection E) {
    if ((E == null) || E.isEmpty()) {
        System.out.println("The collection is empty!");
    }//from  www .  j  a va 2s  .c  o  m

    Set<Field> collectionFields = new TreeSet<>(new Comparator<Field>() {
        @Override
        public int compare(Field o1, Field o2) {
            return o1.getName().compareTo(o2.getName());
        }
    });
    for (Object o : E) {
        Class c = o.getClass();
        createSetOfFields(collectionFields, c);
        while (c.getSuperclass() != null) {
            c = c.getSuperclass();
            createSetOfFields(collectionFields, c);
        }
    }
    String[][] exitText = new String[E.size() + 1][collectionFields.size() + 1];
    exitText[0][0] = String.format("%20s", "Class");
    int indexOfColumn = 0;
    for (Field f : collectionFields) {
        exitText[0][indexOfColumn + 1] = String.format("%20s", f.getName());
        indexOfColumn++;

    }
    int indexOfRow = 0;
    for (Object o : E) {
        indexOfColumn = 0;
        exitText[indexOfRow + 1][0] = String.format("%20s", o.getClass().getSimpleName());
        for (Field field : collectionFields) {
            try {
                field.setAccessible(true);
                if (field.get(o) instanceof Date) {
                    exitText[indexOfRow + 1][indexOfColumn + 1] = String.format("%20tD", field.get(o));
                } else {
                    String temp = String.valueOf(field.get(o));
                    exitText[indexOfRow + 1][indexOfColumn + 1] = String.format("%20s", temp);
                }
            } catch (Exception e) {
                exitText[indexOfRow + 1][indexOfColumn + 1] = String.format("%20s", "-");
            }
            indexOfColumn++;
        }
        indexOfRow++;
    }
    return exitText;
}

From source file:Main.java

public static Collection<String> addElementBeforeAndAfter(Collection<?> collection, String toAddBefore,
        String toAddAfter) {// ww w.java 2  s  .c  o  m
    if (collection == null || collection.isEmpty()) {
        return Collections.emptyList();
    }

    List<String> result = new ArrayList<>(collection.size());
    for (Object o : collection) {
        StringBuilder stringBuilder = new StringBuilder(
                o.toString().length() + toAddBefore.length() + toAddAfter.length());
        stringBuilder.append(toAddBefore);
        stringBuilder.append(o.toString().trim());
        stringBuilder.append(toAddAfter);
        result.add(stringBuilder.toString());
    }
    return result;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> List<T> generatePropertyList(Collection<?> collection, String property) {
    assert property != null;
    if (collection == null || collection.isEmpty()) {
        return new ArrayList<T>(0);
    }/* w  w  w  .ja  v a 2  s.  c  om*/
    List<T> list = new ArrayList<T>(collection.size());
    try {
        for (Object obj : collection) {
            Field field = obj.getClass().getDeclaredField(property);
            field.setAccessible(true);
            Object object = field.get(obj);
            list.add((T) object);
        }
        return list;
    } catch (Throwable e) {
        throw new RuntimeException(e);
    }
}

From source file:com.mseeworld.qzh.util.Debug.java

/**
 * ??// w w  w.jav a2  s  .c  o m
 * @param list
 * @param ts
 * @date    2013-5-8
 */
public static final <T> void printf(Collection<T> list, ToString<T> ts) {
    if (list == null || list.isEmpty())
        return;
    Iterator<T> iter = list.iterator();
    while (iter.hasNext()) {
        T t = iter.next();
        //          if(t == null)continue ;
        if (ts == null) {
            System.out.println(t.toString());
        } else {
            String msg = ts.toString(t);
            //              if(msg != null) {
            System.out.println(msg);
            //              }
        }
    }
}

From source file:Main.java

/**
 * Checks passed {@link Collection} instance on null and on emptiness
 * returns true if it is not null and is not empty
 * //from w w  w.  j a  v a 2 s  . c  o m
 * @param collection
 * @return <code></code>
 */
public static boolean valid(Collection<?> collection) {
    return (collection != null && !collection.isEmpty());
}

From source file:com.emarsys.predict.StringUtil.java

/**
 * Constructs a new String from the elements of input list separated elements with delimiter.
 *
 * @param l         items for the construction
 * @param delimiter the delimiter/*from   w w  w.j  a va  2 s  .  co m*/
 * @return the constructed string
 */
static String toStringWithDelimiter(Collection<?> l, String delimiter) {
    String ret = "";
    if (l != null && !l.isEmpty()) {
        Iterator<?> i = l.iterator();
        while (i.hasNext()) {
            ret += i.next() + delimiter;
        }
        ret = ret.substring(0, ret.length() - delimiter.length());
    }
    return ret;
}

From source file:Main.java

private static String toString(Collection<int[]> arrays) {
    if (arrays == null || arrays.isEmpty()) {
        return "[]";
    }/*from   ww  w.  j  av  a2  s  . c  o m*/
    StringBuilder buffer = new StringBuilder();
    buffer.append('[');
    Iterator<int[]> it = arrays.iterator();
    while (it.hasNext()) {
        buffer.append(Arrays.toString(it.next()));
        if (it.hasNext()) {
            buffer.append(", ");
        }
    }
    buffer.append(']');
    return buffer.toString();
}