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

public static <T> List<List<T>> innerJoin(List<T> l1, List<T> l2, BiFunction<T, T, T> function) {
    if (l1 == null || l2 == null) {
        throw new NullPointerException("inner join arrays must not be null");
    }/*from   www . java2  s  .  c  o m*/

    if (l1.isEmpty() && l2.isEmpty()) {
        return Collections.emptyList();
    } else if (l1.isEmpty()) {
        return Collections.singletonList(l2);
    } else if (l2.isEmpty()) {
        return Collections.singletonList(l1);
    }

    List<List<T>> result = new ArrayList<>(l1.size() * l2.size());
    l1.stream().forEach(t1 -> {
        List<T> l = new ArrayList<>();
        l2.stream().forEach(t2 -> l.add(function.apply(t1, t2)));
        result.add(l);
    });
    return result;
}

From source file:Main.java

/**Throw NullPointerException if the particular object is null
 * @param object The particular object//from  w  ww  . j  a va 2  s  .  com
 * @param message The message which to be wrapped into NullPointerException
 */
public static void notNull(Object object, String message) {
    if (object == null) {
        throw new NullPointerException(message == null ? "" : message);
    }
}

From source file:com.wolvereness.bluebutton.Version.java

private static String getProperty(final Properties properties, final String property) {
    final Object obj = properties.get(property);
    if (obj == null)
        throw new NullPointerException(property);
    return obj.toString();
}

From source file:Main.java

/**
 * Join a collection of strings into a single String object, in the order
 * indicated by the collection's iterator.
 *
 * @param strings a collection containing exclusively String objects
 * @return a single String object//from   w ww .j  a  v a2 s  .  co  m
 */
public static String joinStrings(Collection<String> strings) {
    StringBuilder buf = new StringBuilder();
    if (strings == null) {
        throw new NullPointerException("Received null collection");
    }
    for (String s : strings) {
        buf.append(s);
    }
    return buf.toString();
}

From source file:com.github.jinahya.codec.HexBinaryEncoderProxy.java

/**
 * Returns a new proxy instance for//from  w w  w. j a v a  2s.  c  o m
 * {@code org.apache.commons.codec.BinaryEncoder} with given
 * {@code encoder}.
 *
 * @param encoder the encoder to proxy
 *
 * @return a new proxy instance.
 */
public static Object newInstance(final HexEncoder encoder) {

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

    return newInstance(HexBinaryEncoderProxy.class, HexEncoder.class, encoder);
}

From source file:com.github.rvesse.airline.Cli.java

/**
 * Creates a builder for specifying a command line in fluent style
 * //  w  w w  .j  ava 2 s.c o  m
 * @param name
 *            Program name
 * @return CLI Builder
 */
public static <T> CliBuilder<T> builder(String name) {
    if (name == null)
        throw new NullPointerException("name cannot be null");
    return new CliBuilder<T>(name);
}

From source file:Main.java

/**
 * Calculates the sign value from a byte array
 * /* w ww.j a va2 s .co m*/
 * @param bytes - Given byte array
 * @return Sign value String
 * @throws NullPointerException when bytes is NULL
 */
private static String createSignOfByteAray(byte[] bytes) {
    if (bytes == null) {
        throw new NullPointerException("AuthUtils.createSignOfByteAray() bytes cannot be NULL");
    }
    return String.valueOf(bytes.length);
}

From source file:net.larry1123.util.api.time.StringTime.java

/**
 * Takes just a number or a set of numbers with a D, H, M or, S fallowing it
 * The letters can be upper or lower case
 * 15h 50m 5s/*from ww w .  ja  v  a 2 s  . c  om*/
 *
 * @param string Whole String to decode into parts
 *
 * @return the amount of time in milliseconds that the time string Decodes to
 */
public static long millisecondsFromString(String string) {
    if (string == null) {
        throw new NullPointerException("String can not be null");
    }
    string = string.trim();
    long ret = 0;
    try {
        ret = Long.parseLong(string);
    } catch (NumberFormatException e) {
        for (String part : string.split(" ")) {
            if (part.length() >= 2) {
                String time = part.substring(part.length() - 1);
                switch (Part.getFromString(time)) {
                case DAYS:
                    try {
                        Long days = Long.parseLong(part.substring(0, part.length() - 1));
                        ret += days * DateUtils.MILLIS_PER_DAY;
                    } catch (NumberFormatException error) {
                        // DO nothing right now
                    }
                    break;
                case HOUR:
                    try {
                        Long hours = Long.parseLong(part.substring(0, part.length() - 1));
                        ret += hours * DateUtils.MILLIS_PER_HOUR;
                    } catch (NumberFormatException error) {
                        // DO nothing right now
                    }
                    break;
                case MINUTES:
                    try {
                        Long minutes = Long.parseLong(part.substring(0, part.length() - 1));
                        ret += minutes * DateUtils.MILLIS_PER_MINUTE;
                    } catch (NumberFormatException error) {
                        // DO nothing right now
                    }
                    break;
                case SECONDS:
                    try {
                        Long seconds = Long.parseLong(part.substring(0, part.length() - 1));
                        ret += seconds * DateUtils.MILLIS_PER_SECOND;
                    } catch (NumberFormatException error) {
                        // DO nothing right now
                    }
                    break;
                default:
                    // Something is malformed just let it fly by and keep going
                    break;
                }
            } else if (part.length() == 1) {
                switch (Part.getFromString("" + part.charAt(1))) {
                case DAYS:
                    ret += DateUtils.MILLIS_PER_DAY;
                    break;
                case HOUR:
                    ret += DateUtils.MILLIS_PER_HOUR;
                    break;
                case MINUTES:
                    ret += DateUtils.MILLIS_PER_MINUTE;
                    break;
                case SECONDS:
                    ret += DateUtils.MILLIS_PER_SECOND;
                    break;
                default:
                    // Something is malformed just let it fly by and keep going
                    break;
                }
            }
        }
    }
    return ret;
}

From source file:Main.java

public static <E> ArrayList<E> asArrayList(E first, E second, E... other) {
    if (other == null) {
        throw new NullPointerException("other");
    }//from   www . j  a  v a 2 s .  c  o m
    ArrayList<E> list = new ArrayList<>(1 + 1 + other.length);
    list.add(first);
    list.add(second);
    list.addAll(Arrays.asList(other));
    return list;
}

From source file:Main.java

/**
 * Creates a list of integers from a string within tokens. Empty tokens will
 * be omitted: If a string within tokens is <code>"1,,2,,3"</code> and the
 * delimiter string is <code>","</code>, the returned list of integers
 * contains the tree elements <code>1, 2, 3</code>.
 *
 * <em>It is expected, that each token can be parsed as an integer or is
 * empty!</em>//from   w ww  .ja  va 2  s . c  om
 *
 * @param string    String within tokens parsable as integer
 * @param delimiter Delimiter between the integer tokens. Every character
 *                  of the delimiter string is a separate delimiter. If
 *                  the string within tokens is <code>"1,2:3"</code>
 *                  and the delimiter string is <code>",:"</code>, the
 *                  returned list of integers contains the three elements
 *                  <code>1, 2, 3</code>.
 * @return          list of integers
 * @throws          NumberFormatException if the string contains a not empty
 *                  token that can't parsed as an integer
 */
public static List<Integer> integerTokenToList(String string, String delimiter) {
    if (string == null) {
        throw new NullPointerException("string == null");
    }

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

    List<Integer> integerList = new ArrayList<>();
    StringTokenizer tokenizer = new StringTokenizer(string, delimiter);

    while (tokenizer.hasMoreTokens()) {
        integerList.add(Integer.parseInt(tokenizer.nextToken()));
    }

    return integerList;
}