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

/**
 * Validate a SPDY header value. Does not validate max length.
 *//*w  w w  . jav a 2 s. c  om*/
static void validateHeaderValue(String value) {
    if (value == null) {
        throw new NullPointerException("value");
    }
    for (int i = 0; i < value.length(); i++) {
        char c = value.charAt(i);
        if (c == 0) {
            throw new IllegalArgumentException("value contains null character: " + value);
        }
    }
}

From source file:Main.java

/**
 * @param file//from  ww  w.  j ava2 s .  com
 * @param includeHiddleFiles
 * @param includeFolder
 * @return
 */
public static int getNumFilesInFolder(File file, boolean includeHiddleFiles, boolean includeFolder) {
    if (file == null) {
        throw new NullPointerException("file cannot be null");
    }
    if (!file.exists()) {
        throw new NullPointerException("file does not exist");
    }
    if (file.isFile()) {
        throw new ClassCastException("file is not a directory");
    }
    return getSubfilesNumberInFolder(file, includeHiddleFiles, includeFolder);
}

From source file:Main.java

public static Element findNode(Document document, String nodeName) {
    if (document == null)
        throw new NullPointerException("Document cannot be null!");
    if (nodeName == null)
        throw new NullPointerException("Nodename cannot be null!");
    NodeList nodes = document.getElementsByTagName(nodeName);
    if (nodes == null || nodes.getLength() == 0)
        return null;
    if (nodes.getLength() > 1)
        throw new RuntimeException(nodes.getLength() + " nodes found where only 1 was expected");
    return (Element) nodes.item(0);
}

From source file:Main.java

public static boolean isSymlink(File file) throws IOException {
    if (file == null) {
        throw new NullPointerException("File must not be null");
    }//from   ww w.j  a  va 2s  .c o m
    if (isSystemWindows()) {
        return false;
    }
    File fileInCanonicalDir = null;
    if (file.getParent() == null) {
        fileInCanonicalDir = file;
    } else {
        File canonicalDir = file.getParentFile().getCanonicalFile();
        fileInCanonicalDir = new File(canonicalDir, file.getName());
    }

    return !fileInCanonicalDir.getCanonicalFile().equals(fileInCanonicalDir.getAbsoluteFile());
}

From source file:Main.java

static void checkNotNull(final Object value, final String msg) {
    if (value == null) {
        throw new NullPointerException(msg);
    }//from  www .  j  a  v a 2  s  .c o m
}

From source file:Main.java

/**
 * Join the {@code strings} into one string with {@code delimiter} in 
 * between.// w ww  .j a  v  a 2 s  .  c o m
 * 
 * @param strings the string list to join
 * @param delimiter the delimiter
 * 
 * @return the joined string
 */
public static String join(List<String> strings, String delimiter) {
    if (strings == null) {
        throw new NullPointerException("argument 'strings' cannot be null");
    }
    return join(strings.toArray(new String[strings.size()]), delimiter);
}

From source file:Main.java

public static final byte[] compress(byte[] bytes) {
    if (bytes == null) {
        throw new NullPointerException("byte[] is NULL !");
    }/*from  w w w.j  a v a 2  s  .co  m*/
    ByteArrayOutputStream bos = new ByteArrayOutputStream(8192);
    try {
        GZIPOutputStream gzip = new GZIPOutputStream(bos);
        gzip.write(bytes, 0, bytes.length);
        gzip.finish();
        byte[] fewerBytes = bos.toByteArray();
        gzip.close();
        bos.close();
        gzip = null;
        bos = null;
        return fewerBytes;
    } catch (IOException e) {
        return null;
    }
}

From source file:Main.java

public static Collection<File> listFiles(File directory, String suffix) {
    final String _suffix = "." + suffix;
    FileFilter filter = new FileFilter() {
        @Override/*from  w  w w  .j ava2 s.  c  o  m*/
        public boolean accept(File file) {
            if (file.isDirectory())
                return true;
            String name = file.getName();
            int endLen = _suffix.length();
            if (name.regionMatches(true, name.length() - endLen, _suffix, 0, endLen)) {
                return true;
            }
            return false;
        }
    };
    if (!directory.isDirectory()) {
        throw new IllegalArgumentException("Parameter 'directory' is not a directory");
    }

    if (filter == null) {
        throw new NullPointerException("Parameter 'fileFilter' is null");
    }
    Collection<File> files = new LinkedList<File>();
    innerListFiles(files, directory, filter);
    return files;
}

From source file:Main.java

public static <E> ArrayList<E> arrayAsArrayList(E... elements) {
    if (elements == null) {
        throw new NullPointerException("elements");
    }//  ww w .  j a  v  a  2s  .  c o m
    return new ArrayList<>(Arrays.asList(elements));
}

From source file:Main.java

public static <E> ArrayList<E> asArrayList(E first, E... other) {
    if (other == null) {
        throw new NullPointerException("other");
    }/*w  w w .  j ava 2 s . com*/
    ArrayList<E> list = new ArrayList<>(1 + other.length);
    list.add(first);
    list.addAll(Arrays.asList(other));
    return list;
}