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:Main.java

/**
 * Returns the first element of a list or null if the list
 * is null or empty.//w  w  w .  j  a va 2 s. c om
 * 
 * @param l the list in which to find the first element
 * @return Object the first element of the list
 */
public static Object getFirstElement(List l) {
    // Return null if list is null or empty
    if (l == null || l.isEmpty())
        return null;

    return l.get(0);
}

From source file:Main.java

public static String stringList2String(final String suffix, final List<String> list) {
    if (list == null || list.isEmpty()) {
        return null;
    }/* ww w . j a v  a 2s.co m*/
    StringBuilder builder = new StringBuilder("");
    for (int i = 0; i < list.size(); i++) {
        String value = list.get(i);
        if (value != null && !"".equals(value)) {
            if (i < (list.size() - 1)) {
                builder.append(value).append(suffix);
            } else {
                builder.append(value);
            }
        }
    }
    return builder.toString();
}

From source file:Main.java

public static Element getElement(Element parent, String tagName) {
    List children = getElements(parent, tagName);
    return children.isEmpty() ? null : (Element) children.get(0);
}

From source file:Main.java

static <E> List<E> getList(List<E> orig, Class<E> elemType) {
    if (orig == null || orig.isEmpty()) {
        return Collections.emptyList();
    } else if (orig.size() == 1) {
        return Collections.singletonList(orig.get(0));
    } else {// w  ww  . ja va 2  s. c  o m
        return Collections.unmodifiableList(Arrays.asList(orig.toArray(createArray(elemType, orig.size()))));
    }
}

From source file:Main.java

/**
 * Check if the list contains the member. For objects, it uses standard .equals() method. 
 * For strings, it compares but ignores the case.
 * //from  w  w  w  .j  av  a 2 s  .  c om
 * @param list
 * @param member
 * @return
 */

public static boolean contains(List<? extends Object> list, Object member) {
    if (list.isEmpty() || member == null)
        return false;

    for (Object obj : list) {
        if (obj instanceof String && member instanceof String) {
            if (compareIgnoreCase((String) obj, (String) member))
                return true;
        } else {
            if (member.equals(obj))
                return true;
        }
    }

    return false;
}

From source file:bazaar4idea.command.BzrErrorUtil.java

private static String getLastErrorLine(BzrAbstractResult result) {
    List<String> errorLines = result.getStdErrAsLines();
    if (errorLines.isEmpty()) {
        return null;
    }/*  ww  w  .  j av a 2s  .  co  m*/
    return errorLines.get(errorLines.size() - 1);
}

From source file:Main.java

public static boolean isBackground(Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningTaskInfo> tasks = am.getRunningTasks(1);
    if (!tasks.isEmpty()) {
        ComponentName topActivity = tasks.get(0).topActivity;
        if (!topActivity.getPackageName().equals(context.getPackageName())) {
            return true;
        }/*from ww w  .j av  a 2 s. c  om*/
    }
    return false;
}

From source file:Main.java

public static boolean isApplicationBackground(Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

    List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);
    if (!tasks.isEmpty()) {
        ComponentName topActivity = tasks.get(0).topActivity;
        if (!topActivity.getPackageName().equals(context.getPackageName())) {
            return true;
        }/* w w  w.j  av  a  2  s . c  om*/
    }
    return false;
}

From source file:Main.java

public static <T> List<T> readTypedListOrNUll(Parcel parcel, Parcelable.Creator<T> creator) {
    List<T> result = new ArrayList<>();
    parcel.readTypedList(result, creator);
    if (result.isEmpty())
        return null;
    return result;
}

From source file:Main.java

public static boolean isApplicationBroughtToBackground(Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<RunningTaskInfo> tasks = am.getRunningTasks(1);
    if (tasks != null && !tasks.isEmpty()) {
        ComponentName topActivity = tasks.get(0).topActivity;
        if (!topActivity.getPackageName().equals(context.getPackageName())) {
            return true;
        }/*from  w  w  w.  ja va2s. co  m*/
    }
    return false;
}