Example usage for java.lang NullPointerException NullPointerException

Introduction

In this page you can find the example usage for java.lang NullPointerException NullPointerException.

Prototype

public NullPointerException(String s)

Source Link

Document

Constructs a NullPointerException with the specified detail message.

Usage

From source file:Main.java

/**
 * Creates and returns an unmodifiable List that wraps the given array.
 * Changes to the array will be reflected in the List.
 * @param arr The array to wrap as a List
 * @return an unmodifiable List that wraps the array
 * @throws NullPointerException if the array is null
 *///w w  w.  ja va2  s .  co  m
public static List<Float> listFromFloatArray(final float[] arr) {
    if (arr == null)
        throw new NullPointerException("array cannot be null");
    return new AbstractList<Float>() {
        @Override
        public Float get(int index) {
            return arr[index];
        }

        @Override
        public int size() {
            return arr.length;
        }
    };
}

From source file:Main.java

/**
 * Returns a List of all child Elements of the given Element.
 *
 * @param element the element from which to retrieve child elements
 * @return a List of child Elements./* w w w. java  2  s.c o m*/
 * @throws NullPointerException if the element is null.
 */
public static List getChildElements(Element element) {
    if (element == null)
        throw new NullPointerException("Tried to get child elements on a null element");

    List result = new ArrayList();

    NodeList children = element.getChildNodes();

    for (int i = 0; i != children.getLength(); i++) {
        if (children.item(i).getNodeType() == Node.ELEMENT_NODE) {
            result.add(children.item(i));
        }
    }

    return result;
}

From source file:Main.java

public static <K, V> Map<K, V> copyNullSafeMutableHashMapWithNullValues(Map<? extends K, ? extends V> map) {
    if (map == null)
        throw new NullPointerException("map");

    Map<K, V> result = new HashMap<K, V>(map);
    for (Map.Entry<K, V> entry : result.entrySet()) {
        if (entry.getKey() == null)
            throw new NullPointerException("entry.getKey()");
    }//  w  w w .j  a va  2 s .c om
    return result;
}

From source file:Main.java

/**
 * Treat a variable as an integer in JavaScript style. Note this function can
 * only handle integer and boolean currently.
 *
 * @param var the variable to get value from
 * @return the integer value/*from   w  ww.j ava 2s. com*/
 * @throws IllegalArgumentException the data type of {@code var} is neither
 * integer nor boolean.
 */
public static Integer getVariableValueAsInteger(Object var) {
    if (var == null) {
        throw new NullPointerException("argument 'var' cannot be null");
    }

    Integer returnResult = -1;

    if (var instanceof Integer) {
        returnResult = (Integer) var;
    } else if (var instanceof Boolean) {
        // Javascript treat true as 1
        returnResult = (Boolean) var ? 1 : 0;
    } else {
        throw new IllegalArgumentException("'var' is neither integer nor boolean");
    }

    return returnResult;
}

From source file:Main.java

public static String generateKey(Object... objects) {

    Object[] args = objects;/*w w  w.j  a  v  a  2 s .co m*/

    if (args == null) {
        throw new NullPointerException("Cannot generate key with no params!");
    }

    StringBuilder stringBuilder = new StringBuilder();

    for (Object o : args) {
        if (o != null) {
            if (o instanceof String) {
                stringBuilder.append(o);
                stringBuilder.append("_");
            } else {
                String json = gson.toJson(o);
                stringBuilder.append(json);
                stringBuilder.append("_");
            }
        }
    }

    return Base64.encodeToString(stringBuilder.toString().getBytes(), Base64.DEFAULT);
}

From source file:Main.java

public static File getFile(String[] names) {
    if (names == null) {
        throw new NullPointerException("names must not be null");
    }//from ww  w .j  a v a  2  s .c  o  m
    File file = null;
    for (String name : names) {
        if (file == null)
            file = new File(name);
        else {
            file = new File(file, name);
        }
    }
    return file;
}

From source file:Main.java

/**
 * Returns all elements of a specific class from a container.
 *
 * <em>Only elements of that class are detected, not sub- and supertyes!</em>
 *
 * @param <T> class type//w w  w .j  a va 2  s  .c o m
 * @param container container
 * @param clazz class
 * @return found elements or empty list
 */
public static <T> List<T> getAllOf(Container container, Class<T> clazz) {
    if (container == null) {
        throw new NullPointerException("container == null");
    }

    if (clazz == null) {
        throw new NullPointerException("clazz == null");
    }

    List<T> components = new ArrayList<>();

    addAllOf(container, clazz, components);

    return components;
}

From source file:Main.java

/**
 * Gets a string list based on an iterator.
 * <p>//  w  w  w.j a va  2  s  . c  om
 * As the wrapped Iterator is traversed, an LinkedList of its string values is
 * created. At the end, the list is returned.
 * 
 * @param iterator the iterator to use, not null
 * @return a list of the iterator string contents
 * @throws NullPointerException if iterator parameter is null
 */
public static List<String> toStringList(Iterator<?> iterator) {
    if (iterator == null) {
        throw new NullPointerException("Iterator must not be null");
    }
    List<String> list = new LinkedList<String>();
    while (iterator.hasNext()) {
        list.add(String.valueOf(iterator.next()));
    }
    return list;
}

From source file:Main.java

public static byte[] decodeYUV420SP2RGB(byte[] yuv420sp, int width, int height) {
    final int frameSize = width * height;

    byte[] rgbBuf = new byte[frameSize * 3];

    // if (rgbBuf == null) throw new NullPointerException("buffer 'rgbBuf' is null");
    if (rgbBuf.length < frameSize * 3)
        throw new IllegalArgumentException(
                "buffer 'rgbBuf' size " + rgbBuf.length + " < minimum " + frameSize * 3);

    if (yuv420sp == null)
        throw new NullPointerException("buffer 'yuv420sp' is null");

    if (yuv420sp.length < frameSize * 3 / 2)
        throw new IllegalArgumentException(
                "buffer 'yuv420sp' size " + yuv420sp.length + " < minimum " + frameSize * 3 / 2);

    int i = 0, y = 0;
    int uvp = 0, u = 0, v = 0;
    int y1192 = 0, r = 0, g = 0, b = 0;

    for (int j = 0, yp = 0; j < height; j++) {
        uvp = frameSize + (j >> 1) * width;
        u = 0;//from   w ww .  j  a  v a2  s .c  o m
        v = 0;
        for (i = 0; i < width; i++, yp++) {
            y = (0xff & ((int) yuv420sp[yp])) - 16;
            if (y < 0)
                y = 0;
            if ((i & 1) == 0) {
                v = (0xff & yuv420sp[uvp++]) - 128;
                u = (0xff & yuv420sp[uvp++]) - 128;
            }

            y1192 = 1192 * y;
            r = (y1192 + 1634 * v);
            g = (y1192 - 833 * v - 400 * u);
            b = (y1192 + 2066 * u);

            if (r < 0)
                r = 0;
            else if (r > 262143)
                r = 262143;
            if (g < 0)
                g = 0;
            else if (g > 262143)
                g = 262143;
            if (b < 0)
                b = 0;
            else if (b > 262143)
                b = 262143;

            rgbBuf[yp * 3] = (byte) (r >> 10);
            rgbBuf[yp * 3 + 1] = (byte) (g >> 10);
            rgbBuf[yp * 3 + 2] = (byte) (b >> 10);
        }
    } // for
    return rgbBuf;
}

From source file:Main.java

public static NodeList findNodes(Element parentNode, String nodeName) {
    if (parentNode == null)
        throw new NullPointerException("Parent Node cannot be null!");
    if (nodeName == null)
        throw new NullPointerException("Nodename cannot be null!");
    return parentNode.getElementsByTagName(nodeName);
}