| java.lang.Object
 org.hsqldb.lib.ArrayUtil
| ArrayUtil | | public class ArrayUtil (Code) | | Collection of static methods for operations on arrays
author:
fredt@users
version:
1.7.2
since:
1.7.2 |
| Method Summary | |
| public static void | adjustArray(int type, Object array, int usedElements, int index, int count)
Moves the contents of an array to allow both addition and removal of
elements. | | public static boolean | areEqual(int[] arra, int[] arrb, int count, boolean full)
For full == true returns true if arra and arrb are identical (have the
same length and contain the same integers in the same sequence). | | public static boolean | areEqualSets(int[] arra, int[] arrb)
Returns true if arra and arrb contain the same set of integers, not
necessarily in the same order. | | public static int[] | arraySlice(int[] source, int start, int count)
Returns a range of elements of source from start to end of the array. | | public static void | clearArray(int type, Object data, int from, int to)
Clears an area of the given array of the given type. | | public static int[] | commonElements(int[] arra, int[] arrb)
Returns an int[] containing elements shared between the two arrays
arra and arrb. | | public static boolean | containsAllTrueElements(boolean[] arra, boolean[] arrb)
| | public static boolean | containsAt(byte[] arra, int start, byte[] arrb)
Returns true if arra from position start contains all elements of arrb
in sequential order. | | public static void | copyAdjustArray(Object source, Object dest, Object addition, int colindex, int adjust)
Copies elements of source to dest. | | public static void | copyArray(Object source, Object dest, int count)
Convenience wrapper for System.arraycopy(). | | public static void | copyColumnValues(Object[] row, int[] colindex, Object[] colobject)
Copies some elements of row into colobject by using colindex as
the list of indexes into row. | | public static void | copyColumnValues(int[] row, int[] colindex, int[] colobject)
| | public static int | countCommonElements(int[] arra, int[] arrb)
Returns the number of elements shared between the two arrays containing
sets.
Return the number of elements shared by two column index arrays.
This method assumes that each of these arrays contains a set (each
element index is listed only once in each index array). | | public static int | countNonStartElementsAt(byte[] arra, int start, byte[] arrb)
Returns the count of elements in arra from position start that are not
among the elements of arrb. | | public static int | countSameElements(byte[] arra, int start, byte[] arrb)
Returns the count of elements in arra from position start that are
sequentially equal to the elements of arrb. | | public static int | countStartElementsAt(byte[] arra, int start, byte[] arrb)
Returns the count of elements in arra from position start that are
among the elements of arrb. | | public static Object | duplicateArray(Object source)
Returns a duplicates of an array. | | public static void | fillArray(Object[] array, Object value)
Fills the array with a value. | | public static void | fillArray(int[] array, int value)
| | public static void | fillSequence(int[] colindex)
| | public static int | find(Object[] array, Object object)
Basic find for small arrays of Object. | | public static int | find(int[] array, int value)
Basic find for small arrays of int. | | public static int | find(byte[] arra, int start, int limit, byte[] arrb)
Returns the index of the first occurence of arrb in arra. | | public static int | find(byte[] arra, int start, int limit, int b, int c)
Returns the index of b or c in arra. | | public static int | findIn(byte[] arra, int start, int limit, byte[] charset)
Returns an index into arra (or -1) where the character is in the
charset byte array. | | public static int | findNot(int[] array, int value)
Finds the first element of the array that is not equal to the given value. | | public static int | findNotIn(byte[] arra, int start, int limit, byte[] charset)
Returns an index into arra (or -1) where the character is not in the
charset byte array. | | static int | getClassCode(Class cla)
Returns a distinct int code for each primitive type and for all Object types. | | public static boolean | haveCommonElement(int[] arra, int[] arrb, int bcount)
Returns true if arra and the first bcount elements of arrb share any
element. | | public static boolean | haveEqualArrays(int[] arra, int[] arrb, int count)
| | public static boolean | haveEqualArrays(Object[] arra, Object[] arrb, int count)
| | public static boolean | haveEqualSets(int[] arra, int[] arrb, int count)
Returns true if the first count elements of arra and arrb are identical
sets of integers (not necessarily in the same order). | | public static void | intIndexesToBooleanArray(int[] arra, boolean[] arrb)
Set elements of arrb true if their indexes appear in arrb. | | public static Object | resizeArray(Object source, int newsize)
Returns a new array of given size, containing as many elements of
the original array as it can hold. | | public static Object | resizeArrayIfDifferent(Object source, int newsize)
Returns the given array if newsize is the same as existing. | | public static void | sortArray(int[] array)
Basic sort for small arrays of int. | | public static Object | toAdjustedArray(Object source, Object addition, int colindex, int adjust)
Returns an array containing the elements of parameter source, with one
element removed or added. | | public static int[] | toAdjustedColumnArray(int[] colarr, int colindex, int adjust)
Returns a new array with the elements in collar adjusted to reflect
changes at colindex. |
| CLASS_CODE_BOOLEAN | | final public static int CLASS_CODE_BOOLEAN(Code) | | |
| CLASS_CODE_BYTE | | final public static int CLASS_CODE_BYTE(Code) | | |
| CLASS_CODE_CHAR | | final public static int CLASS_CODE_CHAR(Code) | | |
| CLASS_CODE_DOUBLE | | final public static int CLASS_CODE_DOUBLE(Code) | | |
| CLASS_CODE_FLOAT | | final public static int CLASS_CODE_FLOAT(Code) | | |
| CLASS_CODE_INT | | final public static int CLASS_CODE_INT(Code) | | |
| CLASS_CODE_LONG | | final public static int CLASS_CODE_LONG(Code) | | |
| CLASS_CODE_OBJECT | | final public static int CLASS_CODE_OBJECT(Code) | | |
| CLASS_CODE_SHORT | | final public static int CLASS_CODE_SHORT(Code) | | |
| adjustArray | | public static void adjustArray(int type, Object array, int usedElements, int index, int count)(Code) | | Moves the contents of an array to allow both addition and removal of
elements. Used arguments must be in range.
Parameters:
type - class type of the array
Parameters:
array - the array
Parameters:
usedElements - count of elements of array in use
Parameters:
index - point at which to add or remove elements |
| areEqual | | public static boolean areEqual(int[] arra, int[] arrb, int count, boolean full)(Code) | | For full == true returns true if arra and arrb are identical (have the
same length and contain the same integers in the same sequence).
For full == false returns the result
of haveEqualArrays(arra,arrb,count)
For full == true, the array lengths must be the same as count
|
| areEqualSets | | public static boolean areEqualSets(int[] arra, int[] arrb)(Code) | | Returns true if arra and arrb contain the same set of integers, not
necessarily in the same order. This implies the arrays are of the same
length.
|
| arraySlice | | public static int[] arraySlice(int[] source, int start, int count)(Code) | | Returns a range of elements of source from start to end of the array.
|
| clearArray | | public static void clearArray(int type, Object data, int from, int to)(Code) | | Clears an area of the given array of the given type.
|
| commonElements | | public static int[] commonElements(int[] arra, int[] arrb)(Code) | | Returns an int[] containing elements shared between the two arrays
arra and arrb. The arrays contain sets (no value is repeated).
Used to find the overlap between two arrays of column indexes.
Ordering of the result arrays will be the same as in array
a. The method assumes that each index is only listed
once in the two input arrays.
e.g.
| The arrays |
| int []arra | = | {2,11,5,8} |
| int []arrb | = | {20,8,10,11,28,12} |
| will result in: |
| int []arrc | = | {11,8} |
Parameters:
arra - int[]; first column indexes
Parameters:
arrb - int[]; second column indexes int[] common indexes or null if there is no overlap. |
| containsAllTrueElements | | public static boolean containsAllTrueElements(boolean[] arra, boolean[] arrb)(Code) | | Return true if for each true element in arrb, the corresponding
element in arra is true
|
| containsAt | | public static boolean containsAt(byte[] arra, int start, byte[] arrb)(Code) | | Returns true if arra from position start contains all elements of arrb
in sequential order.
|
| copyAdjustArray | | public static void copyAdjustArray(Object source, Object dest, Object addition, int colindex, int adjust)(Code) | | Copies elements of source to dest. If adjust is -1 the element at
colindex is not copied. If adjust is +1 that element is filled with
the Object addition. All the rest of the elements in source are
shifted left or right accordingly when they are copied. If adjust is 0
the addition is copied over the element at colindex.
No checks are perfomed on array sizes and an exception is thrown
if they are not consistent with the other arguments.
|
| copyArray | | public static void copyArray(Object source, Object dest, int count)(Code) | | Convenience wrapper for System.arraycopy().
|
| copyColumnValues | | public static void copyColumnValues(Object[] row, int[] colindex, Object[] colobject)(Code) | | Copies some elements of row into colobject by using colindex as
the list of indexes into row.
colindex and colobject are of equal length and are normally
shorter than row.
Parameters:
row - the source array
Parameters:
colindex - the list of indexes into row
Parameters:
colobject - the destination array |
| copyColumnValues | | public static void copyColumnValues(int[] row, int[] colindex, int[] colobject)(Code) | | |
| countCommonElements | | public static int countCommonElements(int[] arra, int[] arrb)(Code) | | Returns the number of elements shared between the two arrays containing
sets.
Return the number of elements shared by two column index arrays.
This method assumes that each of these arrays contains a set (each
element index is listed only once in each index array). Otherwise the
returned number will NOT represent the number of unique column indexes
shared by both index array.
Parameters:
arra - int[]; first array of column indexes.
Parameters:
arrb - int[]; second array of column indexes int; number of elements shared by a and b |
| countNonStartElementsAt | | public static int countNonStartElementsAt(byte[] arra, int start, byte[] arrb)(Code) | | Returns the count of elements in arra from position start that are not
among the elements of arrb.
|
| countSameElements | | public static int countSameElements(byte[] arra, int start, byte[] arrb)(Code) | | Returns the count of elements in arra from position start that are
sequentially equal to the elements of arrb.
|
| countStartElementsAt | | public static int countStartElementsAt(byte[] arra, int start, byte[] arrb)(Code) | | Returns the count of elements in arra from position start that are
among the elements of arrb. Stops at any element not in arrb.
|
| duplicateArray | | public static Object duplicateArray(Object source)(Code) | | Returns a duplicates of an array.
|
| fillArray | | public static void fillArray(Object[] array, Object value)(Code) | | Fills the array with a value.
|
| fillArray | | public static void fillArray(int[] array, int value)(Code) | | Fills the int array with a value
|
| fillSequence | | public static void fillSequence(int[] colindex)(Code) | | |
| find | | public static int find(Object[] array, Object object)(Code) | | Basic find for small arrays of Object.
|
| find | | public static int find(int[] array, int value)(Code) | | Basic find for small arrays of int.
|
| find | | public static int find(byte[] arra, int start, int limit, byte[] arrb)(Code) | | Returns the index of the first occurence of arrb in arra. Or -1 if not found.
|
| find | | public static int find(byte[] arra, int start, int limit, int b, int c)(Code) | | Returns the index of b or c in arra. Or -1 if not found.
|
| findIn | | public static int findIn(byte[] arra, int start, int limit, byte[] charset)(Code) | | Returns an index into arra (or -1) where the character is in the
charset byte array.
|
| findNot | | public static int findNot(int[] array, int value)(Code) | | Finds the first element of the array that is not equal to the given value.
|
| findNotIn | | public static int findNotIn(byte[] arra, int start, int limit, byte[] charset)(Code) | | Returns an index into arra (or -1) where the character is not in the
charset byte array.
|
| getClassCode | | static int getClassCode(Class cla)(Code) | | Returns a distinct int code for each primitive type and for all Object types.
|
| haveCommonElement | | public static boolean haveCommonElement(int[] arra, int[] arrb, int bcount)(Code) | | Returns true if arra and the first bcount elements of arrb share any
element.
Used for checks for any overlap between two arrays of column indexes.
|
| haveEqualArrays | | public static boolean haveEqualArrays(int[] arra, int[] arrb, int count)(Code) | | Returns true if the first count elements of arra and arrb are identical
subarrays of integers
|
| haveEqualArrays | | public static boolean haveEqualArrays(Object[] arra, Object[] arrb, int count)(Code) | | Returns true if the first count elements of arra and arrb are identical
subarrays of Objects
|
| haveEqualSets | | public static boolean haveEqualSets(int[] arra, int[] arrb, int count)(Code) | | Returns true if the first count elements of arra and arrb are identical
sets of integers (not necessarily in the same order).
|
| intIndexesToBooleanArray | | public static void intIndexesToBooleanArray(int[] arra, boolean[] arrb)(Code) | | Set elements of arrb true if their indexes appear in arrb.
|
| resizeArray | | public static Object resizeArray(Object source, int newsize)(Code) | | Returns a new array of given size, containing as many elements of
the original array as it can hold. N.B. Always returns a new array
even if newsize parameter is the same as the old size.
|
| resizeArrayIfDifferent | | public static Object resizeArrayIfDifferent(Object source, int newsize)(Code) | | Returns the given array if newsize is the same as existing.
Returns a new array of given size, containing as many elements of
the original array as it can hold.
|
| sortArray | | public static void sortArray(int[] array)(Code) | | Basic sort for small arrays of int.
|
| toAdjustedArray | | public static Object toAdjustedArray(Object source, Object addition, int colindex, int adjust)(Code) | | Returns an array containing the elements of parameter source, with one
element removed or added. Parameter adjust {-1, +1} indicates the
operation. Parameter colindex indicates the position at which an element
is removed or added. Parameter addition is an Object to add when
adjust is +1.
|
| toAdjustedColumnArray | | public static int[] toAdjustedColumnArray(int[] colarr, int colindex, int adjust)(Code) | | Returns a new array with the elements in collar adjusted to reflect
changes at colindex.
Each element in collarr represents an index into another array
otherarr.
colindex is the index at which an element is added or removed.
Each element in the result array represents the new,
adjusted index.
For each element of collarr that represents an index equal to
colindex and adjust is -1, the result will not contain that element
and will be shorter than collar by one element.
Parameters:
colarr - the source array
Parameters:
colindex - index at which to perform adjustement
Parameters:
adjust - +1, 0 or -1 new, adjusted array |
|
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