Example usage for java.lang.reflect Array getLength

Introduction

In this page you can find the example usage for java.lang.reflect Array getLength.

Prototype

@HotSpotIntrinsicCandidate
public static native int getLength(Object array) throws IllegalArgumentException;

Source Link

Document

Returns the length of the specified array object, as an int .

Usage

From source file:Main.java

/**
 * Converts an Object reference that is known to be an array into an
 * Object[]. If the array is assignable to Object[], the array passed in is
 * simply cast and returned. Otherwise a new Object[] of equal size is
 * constructed and the elements are wrapped and inserted into the new array
 * before being returned./*from ww w .  jav  a2s.c  o m*/
 * 
 * @param in
 *            an array of Objects or primitives
 * @return an Object[], either the array passed in, or in the case of
 *         primitives, a new Object[] containing a wrapper for each element
 *         in the input array
 * @throws IllegalArgumentException
 *             thrown if the in parameter is null or not an array
 */
public static Object[] asObjectArray(Object in) {
    if (in == null || !in.getClass().isArray()) {
        throw new IllegalArgumentException("Parameter to asObjectArray must be a non-null array.");
    } else if (in instanceof Object[]) {
        return (Object[]) in;
    } else {
        int length = Array.getLength(in);
        Object[] out = new Object[length];
        for (int i = 0; i < length; ++i) {
            out[i] = Array.get(in, i);
        }

        return out;
    }
}

---

From source file:Main.java

/**
 * Returns the size of the collection if it can be determined to be a collection
 *
 * @param value the collection/*from ww  w.ja  v a  2s  . co m*/
 * @return the size, or <tt>null</tt> if not a collection
 */
public static Integer size(Object value) {
    if (value != null) {
        if (value instanceof Collection) {
            Collection<?> collection = (Collection<?>) value;
            return collection.size();
        } else if (value instanceof Map) {
            Map<?, ?> map = (Map<?, ?>) value;
            return map.size();
        } else if (value instanceof Object[]) {
            Object[] array = (Object[]) value;
            return array.length;
        } else if (value.getClass().isArray()) {
            return Array.getLength(value);
        } else if (value instanceof NodeList) {
            NodeList nodeList = (NodeList) value;
            return nodeList.getLength();
        }
    }
    return null;
}

---

From source file:com.chadekin.jadys.commons.expression.SqlExpressionBuilder.java

public static boolean isBlankValue(Object value) {
    boolean isBlank = value == null || StringUtils.isBlank(value.toString());
    if (!isBlank) {
        boolean isEmptyCollection = value instanceof Collection && CollectionUtils.isEmpty((Collection) value);
        boolean isEmptyArray = value.getClass().isArray() && Array.getLength(value) == 0;
        isBlank = isEmptyCollection || isEmptyArray;
    }//from  ww  w  .j  a  v a  2  s  .com
    return isBlank;
}

---

From source file:Main.java

/**
 * General purpose list converter method. Will convert arrays, collections,
 * iterables etc. into lists.//from  w  w w .ja v  a 2s.  co m
 * 
 * If the argument is a single object (such as a String or a POJO) it will
 * be wrapped in a single-element list.
 * 
 * Null will be converted to the empty list.
 * 
 * @param obj
 *            any object
 * @return a list representation of the object
 */
public static List<?> toList(Object obj) {
    final List<Object> result;
    if (obj == null) {
        result = Collections.emptyList();
    } else if (obj instanceof List) {
        @SuppressWarnings("unchecked")
        List<Object> list = (List<Object>) obj;
        result = list;
    } else if (obj.getClass().isArray()) {
        int length = Array.getLength(obj);
        result = new ArrayList<Object>(length);
        for (int i = 0; i < length; i++) {
            result.add(Array.get(obj, i));
        }
    } else if (obj instanceof Iterable) {
        result = new ArrayList<Object>();
        for (Object item : (Iterable<?>) obj) {
            result.add(item);
        }
    } else if (obj instanceof Iterator) {
        result = new ArrayList<Object>();
        Iterator<?> it = (Iterator<?>) obj;
        while (it.hasNext()) {
            result.add(it.next());
        }
    } else {
        result = new ArrayList<Object>(1);
        result.add(obj);
    }
    return result;
}

---

From source file:br.msf.commons.util.ArrayUtils.java

/**
 * Returns the length of the given array.
 *
 * @param array The array to be evaluated.
 * @return The array length./* w w w.  j  a v  a 2  s . co m*/
 */
public static int getSize(final Object array) {
    return ObjectUtils.isArray(array) ? Array.getLength(array) : 0;
}

---

From source file:mil.jpeojtrs.sca.util.PrimitiveArrayUtils.java

public static byte[] convertToByteArray(final Object array) {
    if (array == null) {
        return null;
    }/*  www.j  ava 2s .c o  m*/
    if (array instanceof byte[]) {
        return (byte[]) array;
    }
    if (array instanceof Byte[]) {
        return ArrayUtils.toPrimitive((Byte[]) array);
    }
    final byte[] newArray = new byte[Array.getLength(array)];
    for (int i = 0; i < newArray.length; i++) {
        final Number val = (Number) Array.get(array, i);
        newArray[i] = val.byteValue();
    }
    return newArray;
}

---

From source file:Main.java

/**
 * @return an Object array for the given object.
 *
 * @param obj  Object to convert to an array.  Converts primitive
 *             arrays to Object arrays consisting of their wrapper
 *             classes.  If the object is not an array (object or primitve)
 *             then a new array of the given type is created and the
 *             object is set as the sole element.
 *///from w ww.  j  av a  2  s .  co  m
public static Object[] toArray(final Object obj) {
    // if the object is an array, the cast and return it.
    if (obj instanceof Object[]) {
        return (Object[]) obj;
    }

    // if the object is an array of primitives then wrap the array
    Class type = obj.getClass();
    Object array;
    if (type.isArray()) {
        int length = Array.getLength(obj);
        Class componentType = type.getComponentType();
        array = Array.newInstance(componentType, length);
        for (int i = 0; i < length; i++) {
            Array.set(array, i, Array.get(obj, i));
        }
    } else {
        array = Array.newInstance(type, 1);
        Array.set(array, 0, obj);
    }

    return (Object[]) array;
}

---

From source file:Main.java

/**
 * <p>//from  w w w  .j av a 2s .c o  m
 * Converts an Object reference that is known to be an array into a List.
 * Semantically very similar to {@link java.util.Arrays#asList(Object[])}
 * except that this method can deal with arrays of primitives in the same
 * manner as arrays as objects.
 * </p>
 * 
 * <p>
 * A new List is created of the same size as the array, and elements are
 * copied from the array into the List. If elements are primitives then they
 * are converted to the appropriate wrapper types in order to return a List.
 * </p>
 * 
 * @param in
 *            an array of Objects or primitives (null values are not
 *            allowed)
 * @return a List containing an element for each element in the input array
 * @throws IllegalArgumentException
 *             thrown if the in parameter is null or not an array
 */
public static List<Object> asList(Object in) {
    if (in == null || !in.getClass().isArray()) {
        throw new IllegalArgumentException("Parameter to asObjectArray must be a non-null array.");
    } else {
        int length = Array.getLength(in);
        LinkedList<Object> list = new LinkedList<Object>();
        for (int i = 0; i < length; ++i) {
            list.add(i, Array.get(in, i));
        }

        return list;
    }
}

---

From source file:cloudnet.util.Dumper.java

public static String dump(Object o, int maxDepth, int maxArrayElements, String[] ignoreList) {
    DumpContext ctx = Dumper.getInstance().new DumpContext();
    ctx.maxDepth = maxDepth;/*  w w w.j a v a2s.  c om*/
    ctx.maxArrayElements = maxArrayElements;

    if (ignoreList != null) {
        for (int i = 0; i < Array.getLength(ignoreList); i++) {
            int colonIdx = ignoreList[i].indexOf(':');
            if (colonIdx == -1) {
                ignoreList[i] = ignoreList[i] + ":";
            }
            ctx.ignoreList.put(ignoreList[i], ignoreList[i]);
        }
    }

    return dump(o, ctx);
}

---

From source file:ArrayConverter.java

private static void addToList(final List list, final Object array) {
    final int length = Array.getLength(array);
    for (int i = 0; i < length; i++) {
        final Object value = Array.get(array, i);
        if (value == null) {
            list.add(null);//from  w w  w.j a  v  a2s. c  o m
            continue;
        }

        if (value.getClass().isArray() == false) {
            list.add(value);
            continue;
        }

        ArrayConverter.addToList(list, value);
    }
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• »