com.twelvemonkeys.util.CollectionUtil.subArray java code examples

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}

/**
 * Creates an array containing a subset of the original array.
 * If the sub array is same length as the original
 * ({@code pStart == 0}), the original array will be returned.
 *
 * @param pArray the original array
 * @param pStart the start index of the original array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null}
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
public static <T> T[] subArray(T[] pArray, int pStart) {
  return subArray(pArray, pStart, -1);
}

/**
 * Creates an array containing a subset of the original array.
 * If the sub array is same length as the original
 * ({@code pStart == 0}), the original array will be returned.
 *
 * @param pArray the original array
 * @param pStart the start index of the original array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null} or
 *         if {@code pArray} is not an array.
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
public static Object subArray(Object pArray, int pStart) {
  return subArray(pArray, pStart, -1);
}

/**
 * Creates an array containing a subset of the original array.
 * If the {@code pLength} parameter is negative, it will be ignored.
 * If there are not {@code pLength} elements in the original array
 * after {@code pStart}, the {@code pLength} parameter will be
 * ignored.
 * If the sub array is same length as the original, the original array will
 * be returned.
 *
 * @param pArray  the original array
 * @param pStart  the start index of the original array
 * @param pLength the length of the new array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0 and {@code pLength} is either
 *         negative, or greater or equal to {@code pArray.length}.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null}
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
@SuppressWarnings("unchecked")
public static <T> T[] subArray(T[] pArray, int pStart, int pLength) {
  return (T[]) subArray((Object) pArray, pStart, pLength);
}

public String getValueAsString() {
  if (valueCount() > 1) {
    if (valueCount() < 16) {
      return arrayToString(value);
    }
    else {
      String first = arrayToString(CollectionUtil.subArray(value, 0, 4));
      String last = arrayToString(CollectionUtil.subArray(value, valueCount() - 4, 4));
      return String.format("%s ... %s (%d)", first.substring(0, first.length() - 1), last.substring(1), valueCount());
    }
  }
  if (value != null && value.getClass().isArray() && Array.getLength(value) == 1) {
    return String.valueOf(Array.get(value, 0));
  }
  return String.valueOf(value);
}

@Test
public void testSubArrayObject() {
  String[] strings = CollectionUtil.subArray(new String[] {"foo", "bar", "baz", "xyzzy"}, 1, 2);
  assertArrayEquals(new String[] {"bar", "baz"}, strings);
}

@Test
public void testSubArrayNative() {
  int[] numbers = (int[]) CollectionUtil.subArray(new int[] {1, 2, 3, 4, 5}, 1, 3);
  assertArrayEquals(new int[] {2, 3, 4}, numbers);
}

/**
 * Creates an array containing a subset of the original array.
 * If the sub array is same length as the original
 * ({@code pStart == 0}), the original array will be returned.
 *
 * @param pArray the origianl array
 * @param pStart the start index of the original array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null} or
 *         if {@code pArray} is not an array.
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
public static Object subArray(Object pArray, int pStart) {
  return subArray(pArray, pStart, -1);
}

/**
 * Creates an array containing a subset of the original array.
 * If the sub array is same length as the original
 * ({@code pStart == 0}), the original array will be returned.
 *
 * @param pArray the original array
 * @param pStart the start index of the original array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null}
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
public static <T> T[] subArray(T[] pArray, int pStart) {
  return subArray(pArray, pStart, -1);
}

/**
 * Creates an array containing a subset of the original array.
 * If the sub array is same length as the original
 * ({@code pStart == 0}), the original array will be returned.
 *
 * @param pArray the original array
 * @param pStart the start index of the original array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null}
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
public static <T> T[] subArray(T[] pArray, int pStart) {
  return subArray(pArray, pStart, -1);
}

/**
 * Creates an array containing a subset of the original array.
 * If the sub array is same length as the original
 * ({@code pStart == 0}), the original array will be returned.
 *
 * @param pArray the original array
 * @param pStart the start index of the original array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null} or
 *         if {@code pArray} is not an array.
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
public static Object subArray(Object pArray, int pStart) {
  return subArray(pArray, pStart, -1);
}

/**
 * Creates an array containing a subset of the original array.
 * If the sub array is same length as the original
 * ({@code pStart == 0}), the original array will be returned.
 *
 * @param pArray the original array
 * @param pStart the start index of the original array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null} or
 *         if {@code pArray} is not an array.
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
public static Object subArray(Object pArray, int pStart) {
  return subArray(pArray, pStart, -1);
}

/**
 * Creates an array containing a subset of the original array.
 * If the {@code pLength} parameter is negative, it will be ignored.
 * If there are not {@code pLength} elements in the original array
 * after {@code pStart}, the {@code pLength} parameter will be
 * ignored.
 * If the sub array is same length as the original, the original array will
 * be returned.
 *
 * @param pArray  the original array
 * @param pStart  the start index of the original array
 * @param pLength the length of the new array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0 and {@code pLength} is either
 *         negative, or greater or equal to {@code pArray.length}.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null}
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
@SuppressWarnings("unchecked")
public static <T> T[] subArray(T[] pArray, int pStart, int pLength) {
  return (T[]) subArray((Object) pArray, pStart, pLength);
}

/**
 * Creates an array containing a subset of the original array.
 * If the {@code pLength} parameter is negative, it will be ignored.
 * If there are not {@code pLength} elements in the original array
 * after {@code pStart}, the {@code pLength} parameter will be
 * ignored.
 * If the sub array is same length as the original, the original array will
 * be returned.
 *
 * @param pArray  the original array
 * @param pStart  the start index of the original array
 * @param pLength the length of the new array
 * @return a subset of the original array, or the original array itself,
 *         if {@code pStart} is 0 and {@code pLength} is either
 *         negative, or greater or equal to {@code pArray.length}.
 *
 * @throws IllegalArgumentException if {@code pArray} is {@code null}
 * @throws ArrayIndexOutOfBoundsException if {@code pStart} < 0
 */
@SuppressWarnings("unchecked")
public static <T> T[] subArray(T[] pArray, int pStart, int pLength) {
  return (T[]) subArray((Object) pArray, pStart, pLength);
}

public String getValueAsString() {
  if (valueCount() > 1) {
    if (valueCount() < 16) {
      return arrayToString(value);
    }
    else {
      String first = arrayToString(CollectionUtil.subArray(value, 0, 4));
      String last = arrayToString(CollectionUtil.subArray(value, valueCount() - 4, 4));
      return String.format("%s ... %s (%d)", first.substring(0, first.length() - 1), last.substring(1), valueCount());
    }
  }
  if (value != null && value.getClass().isArray() && Array.getLength(value) == 1) {
    return String.valueOf(Array.get(value, 0));
  }
  return String.valueOf(value);
}

public String getValueAsString() {
  if (valueCount() > 1) {
    if (valueCount() < 16) {
      return arrayToString(value);
    }
    else {
      String first = arrayToString(CollectionUtil.subArray(value, 0, 4));
      String last = arrayToString(CollectionUtil.subArray(value, valueCount() - 4, 4));
      return String.format("%s ... %s (%d)", first.substring(0, first.length() - 1), last.substring(1), valueCount());
    }
  }
  if (value != null && value.getClass().isArray() && Array.getLength(value) == 1) {
    return String.valueOf(Array.get(value, 0));
  }
  return String.valueOf(value);
}

@Test
public void testSubArrayNative() {
  int[] numbers = (int[]) CollectionUtil.subArray(new int[] {1, 2, 3, 4, 5}, 1, 3);
  assertArrayEquals(new int[] {2, 3, 4}, numbers);
}

@Test
public void testSubArrayObject() {
  String[] strings = CollectionUtil.subArray(new String[] {"foo", "bar", "baz", "xyzzy"}, 1, 2);
  assertArrayEquals(new String[] {"bar", "baz"}, strings);
}

@Test
public void testSubArrayObject() {
  String[] strings = CollectionUtil.subArray(new String[] {"foo", "bar", "baz", "xyzzy"}, 1, 2);
  assertArrayEquals(new String[] {"bar", "baz"}, strings);
}

@Test
public void testSubArrayNative() {
  int[] numbers = (int[]) CollectionUtil.subArray(new int[] {1, 2, 3, 4, 5}, 1, 3);
  assertArrayEquals(new int[] {2, 3, 4}, numbers);
}

Javadoc

Creates an array containing a subset of the original array. If the sub array is same length as the original ( pStart == 0), the original array will be returned.

Popular methods of CollectionUtil

iterator
Creates a thin Iterator wrapper around an array.
mergeArrays
Merges two arrays into a new array. Elements from array1 and array2 will be copied into a new array,
addAll
Adds all elements of the iterator to the collection.
generify
generify2
invert
Creates an inverted mapping of the key/value pairs in the given map. Optionally, a duplicate handler
reverseOrder
test

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How to use subArraymethodin com.twelvemonkeys.util.CollectionUtil

Best Java code snippets using com.twelvemonkeys.util.CollectionUtil.subArray (Showing top 19 results out of 315)

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subArray
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com.twelvemonkeys.util.CollectionUtil