Package com.android.internal.util

Class ArrayUtils

java.lang.Object

com.android.internal.util.ArrayUtils

public class ArrayUtils
extends Object

ArrayUtils contains some methods that you can call to find out the most efficient increments by which to grow arrays.

Method Summary

Modifier and Type	Method	Description
static <T> ArraySet<T>	add(ArraySet<T> cur, T val)
static <T> ArrayList<T>	add(ArrayList<T> cur, T val)
static <T> T[]	appendElement(Class<T> kind, T[] array, T element)	Adds value to given array if not already present, providing set-like behavior.
static int[]	appendInt(int[] cur, int val)	Adds value to given array if not already present, providing set-like behavior.
static long[]	appendLong(long[] cur, long val)	Adds value to given array if not already present, providing set-like behavior.
static long[]	cloneOrNull(long[] array)
static boolean	contains(int[] array, int value)
static boolean	contains(long[] array, long value)
static <T> boolean	contains(ArraySet<T> cur, T val)
static <T> boolean	contains(ArrayList<T> cur, T val)
static <T> boolean	contains(T[] array, T value)	Checks that value is present as at least one of the elements of the array.
static <T> boolean	containsAll(T[] array, T[] check)	Test if all check items are contained in array.
static <T> T[]	emptyArray(Class<T> kind)	Returns an empty array of the specified type.
static boolean	equals(byte[] array1, byte[] array2, int length)	Checks if the beginnings of two byte arrays are equal.
static <T> int	indexOf(T[] array, T value)	Return first index of value in array, or -1 if not found.
static boolean	isEmpty(int[] array)	Checks if given array is null or has zero elements.
static boolean	isEmpty(long[] array)	Checks if given array is null or has zero elements.
static <T> boolean	isEmpty(T[] array)	Checks if given array is null or has zero elements.
static <T> T[]	newUnpaddedArray(Class<T> clazz, int minLen)
static boolean[]	newUnpaddedBooleanArray(int minLen)
static byte[]	newUnpaddedByteArray(int minLen)
static char[]	newUnpaddedCharArray(int minLen)
static float[]	newUnpaddedFloatArray(int minLen)
static int[]	newUnpaddedIntArray(int minLen)
static long[]	newUnpaddedLongArray(int minLen)
static Object[]	newUnpaddedObjectArray(int minLen)
static <T> boolean	referenceEquals(ArrayList<T> a, ArrayList<T> b)	Returns true if the two ArrayLists are equal with respect to the objects they contain.
static <T> ArraySet<T>	remove(ArraySet<T> cur, T val)
static <T> ArrayList<T>	remove(ArrayList<T> cur, T val)
static <T> T[]	removeElement(Class<T> kind, T[] array, T element)	Removes value from given array if present, providing set-like behavior.
static int[]	removeInt(int[] cur, int val)	Removes value from given array if present, providing set-like behavior.
static long[]	removeLong(long[] cur, long val)	Removes value from given array if present, providing set-like behavior.
static String[]	removeString(String[] cur, String val)	Removes value from given array if present, providing set-like behavior.
static long	total(long[] array)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

newUnpaddedByteArray

public static byte[] newUnpaddedByteArray(int minLen)

newUnpaddedCharArray

public static char[] newUnpaddedCharArray(int minLen)

newUnpaddedIntArray

public static int[] newUnpaddedIntArray(int minLen)

newUnpaddedBooleanArray

public static boolean[] newUnpaddedBooleanArray(int minLen)

newUnpaddedLongArray

public static long[] newUnpaddedLongArray(int minLen)

newUnpaddedFloatArray

public static float[] newUnpaddedFloatArray(int minLen)

newUnpaddedObjectArray

public static Object[] newUnpaddedObjectArray(int minLen)

newUnpaddedArray

public static <T> T[] newUnpaddedArray(Class<T> clazz,
                                       int minLen)

equals

public static boolean equals(byte[] array1,
                             byte[] array2,
                             int length)

Checks if the beginnings of two byte arrays are equal.

Parameters:

array1 - the first byte array

array2 - the second byte array

length - the number of bytes to check

Returns:

true if they're equal, false otherwise

emptyArray

public static <T> T[] emptyArray(Class<T> kind)

Returns an empty array of the specified type. The intent is that it will return the same empty array every time to avoid reallocation, although this is not guaranteed.

isEmpty

public static <T> boolean isEmpty(T[] array)

Checks if given array is null or has zero elements.

isEmpty

public static boolean isEmpty(int[] array)

Checks if given array is null or has zero elements.

isEmpty

public static boolean isEmpty(long[] array)

Checks if given array is null or has zero elements.

contains

public static <T> boolean contains(T[] array,
                                   T value)

Checks that value is present as at least one of the elements of the array.

Parameters:

array - the array to check in

value - the value to check for

Returns:

true if the value is present in the array

indexOf

public static <T> int indexOf(T[] array,
                              T value)

Return first index of value in array, or -1 if not found.

containsAll

public static <T> boolean containsAll(T[] array,
                                      T[] check)

Test if all check items are contained in array.

contains

public static boolean contains(int[] array,
                               int value)

contains

public static boolean contains(long[] array,
                               long value)

total

public static long total(long[] array)

appendElement

public static <T> T[] appendElement(Class<T> kind,
                                    T[] array,
                                    T element)

Adds value to given array if not already present, providing set-like behavior.

removeElement

public static <T> T[] removeElement(Class<T> kind,
                                    T[] array,
                                    T element)

Removes value from given array if present, providing set-like behavior.

appendInt

public static int[] appendInt(int[] cur,
                              int val)

Adds value to given array if not already present, providing set-like behavior.

removeInt

public static int[] removeInt(int[] cur,
                              int val)

Removes value from given array if present, providing set-like behavior.

removeString

public static String[] removeString(String[] cur,
                                    String val)

Removes value from given array if present, providing set-like behavior.

appendLong

public static long[] appendLong(long[] cur,
                                long val)

Adds value to given array if not already present, providing set-like behavior.

removeLong

public static long[] removeLong(long[] cur,
                                long val)

Removes value from given array if present, providing set-like behavior.

cloneOrNull

public static long[] cloneOrNull(long[] array)

add

public static <T> ArraySet<T> add(ArraySet<T> cur,
                                  T val)

remove

public static <T> ArraySet<T> remove(ArraySet<T> cur,
                                     T val)

contains

public static <T> boolean contains(ArraySet<T> cur,
                                   T val)

add

public static <T> ArrayList<T> add(ArrayList<T> cur,
                                   T val)

remove

public static <T> ArrayList<T> remove(ArrayList<T> cur,
                                      T val)

contains

public static <T> boolean contains(ArrayList<T> cur,
                                   T val)

referenceEquals

public static <T> boolean referenceEquals(ArrayList<T> a,
                                          ArrayList<T> b)

Returns true if the two ArrayLists are equal with respect to the objects they contain. The objects must be in the same order and be reference equal (== not .equals()).