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 a list of strings from a string within tokens. Empty tokens will
 * be omitted: If a string within tokens is <code>"a,,b,,c"</code> and the
 * delimiter string is <code>","</code>, the returned list of strings
 * contains the tree elements <code>"a", "b", "c"</code>.
 *
 * @param string    String within tokens
 * @param delimiter Delimiter that separates the tokens. Every character
 *                  of the delimiter string is a separate delimiter. If
 *                  the string within tokens is <code>"I,like:ice"</code>
 *                  and the delimiter string is <code>",:"</code>, the
 *                  returned list of strings contains the three elements
 *                  <code>"I", "like", "ice"</code>.
 * @return          List of strings/* w w w. j a  v a2  s.c  o m*/
 */
public static List<String> stringTokenToList(String string, String delimiter) {
    if (string == null) {
        throw new NullPointerException("string == null");
    }

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

    StringTokenizer tokenizer = new StringTokenizer(string, delimiter);
    List<String> list = new ArrayList<>(tokenizer.countTokens());

    while (tokenizer.hasMoreTokens()) {
        list.add(tokenizer.nextToken());
    }

    return list;
}

From source file:Main.java

public static void valiObjectIsNull(Object object, String objectName) throws NullPointerException {
    if (object == null) {
        throw new NullPointerException("Object '" + objectName + "' is null!");
    }/*ww  w.ja  v a2s.c o  m*/
}

From source file:Main.java

public static boolean isSymLink(File filePath) throws IOException {
    if (filePath == null)
        throw new NullPointerException("filePath cannot be null");
    File canonical;/*from   www. ja  va  2 s. c o  m*/
    if (filePath.getParent() == null) {
        canonical = filePath;
    } else {
        File canonDir = filePath.getParentFile().getCanonicalFile();
        canonical = new File(canonDir, filePath.getName());
    }
    return !canonical.getCanonicalFile().equals(canonical.getAbsoluteFile());
}

From source file:Main.java

/**
 * Checks if passed object is not null (and throws {@link NullPointerException} if not). 
 * Thrown exception contains proper message with passed object name for easier identification.
 * //from   ww  w .java  2  s  .  co  m
 * @param objectName name of passed object
 * @param objectToCheck object to be checked
 * 
 * @throws NullPointerException if passed object is null
 */
public static <T> void notNull(String objectName, T objectToCheck) {
    if (objectToCheck == null)
        throw new NullPointerException(objectName + " is null");
}

From source file:ca.uhn.fhir.util.ObjectUtil.java

public static <T> T requireNonNull(T obj, String message) {
    if (obj == null)
        throw new NullPointerException(message);
    return obj;/*from  w  w w.  j a v  a  2s. c  o  m*/
}

From source file:Main.java

/**
 * Creates an Iterable instance that just returns the given Iterator from its iterator() method.
 * /* w w w.jav a  2  s  .c  om*/
 * This is useful for using an iterator in a foreach loop directly.
 * 
 * <p>
 * Example use:
 * <pre>
 *     for (Object o : iterable(iterator)) { ... }
 * </pre>
 * 
 * @throws NullPointerException if list is {@code null}
 */
public static <T> Iterable<T> iterable(final Iterator<T> iter) {
    if (iter == null)
        throw new NullPointerException("iter parameter is null"); //$NON-NLS-1$

    return new Iterable<T>() {
        @Override
        public Iterator<T> iterator() {
            return iter;
        }
    };
}

From source file:com.nabla.wapp.server.general.Assert.java

/**
 * Test if object is not null//from  w w w.  ja  v a  2  s .  co m
 * @param ref - object to test
 * @throws NullPointerException if object is null
 */
public static <T> void notNull(final T ref) throws NullPointerException {
    if (log.isDebugEnabled()) {
        if (ref == null)
            throw new NullPointerException("assertNotNull failed");
    }
}

From source file:Main.java

/**
 * Given an ordered list of directories to look in, locate the specified file.
 * Returns <code>null</code> if file not found.
 * @param loadpaths the ordered list of paths to search.
 * @param filename the name of the file.
 * @return a File object corresponding to the file. <code>null</code> if
 *     file not found.//from   ww w . ja  v a  2  s  .  com
 */
public static File locateFile(List<String> loadpaths, String filename) {
    if (filename == null) {
        throw new NullPointerException("No filename provided");
    }
    if (loadpaths == null) {
        throw new NullPointerException("No loadpaths provided.");
    }
    for (String path : loadpaths) {
        File file = new File(path, filename);
        if (file.exists()) {
            return file;
        }
    }
    return null;
}

From source file:Main.java

public static MarginLayoutParams newLayoutParam(ViewGroup placer, int width, int height) {
    if (placer instanceof FrameLayout) {
        return new FrameLayout.LayoutParams(width, height);
    } else if (placer instanceof RelativeLayout) {
        return new RelativeLayout.LayoutParams(width, height);
    } else if (placer == null) {
        throw new NullPointerException("placer is null");
    } else {//from  w w  w.  j ava 2s . c  o  m
        throw new IllegalArgumentException(
                "placer is neither FrameLayout nor RelativeLayout: " + placer.getClass().getName());
    }
}

From source file:Main.java

/**
 * Verify that the basic constraints of a {@link SafeStyles} are met. This
 * method is not a guarantee that the specified css is safe for use in a CSS
 * style attribute. It is a minimal set of assertions to check for common
 * errors.//w  w  w .  j a  v a2s  . c o  m
 * 
 * @param styles the CSS properties string
 * @throws NullPointerException if the css is null
 * @throws AssertionError if the css does not meet the contraints
 */
static void verifySafeStylesConstraints(String styles) {
    if (styles == null) {
        throw new NullPointerException("css is null");
    }

    // CSS properties must end in a semi-colon or they cannot be safely
    // composed with other properties.
    assert ((styles.trim().length() == 0) || styles.endsWith(";")) : "Invalid CSS Property: '" + styles
            + "'. CSS properties must be an empty string or end with a semi-colon (;).";
    assert !styles.contains("<") && !styles.contains(">") : "Invalid CSS Property: '" + styles
            + "'. CSS should not contain brackets (< or >).";
}