| java.lang.Object
 com.ibm.icu.util.CompactByteArray
| CompactByteArray | | final public class CompactByteArray implements Cloneable(Code) | | class CompactATypeArray : use only on primitive data types
Provides a compact way to store information that is indexed by Unicode
values, such as character properties, types, keyboard values, etc.This
is very useful when you have a block of Unicode data that contains
significant values while the rest of the Unicode data is unused in the
application or when you have a lot of redundance, such as where all 21,000
Han ideographs have the same value. However, lookup is much faster than a
hash table.
A compact array of any primitive data type serves two purposes:
- Fast access of the indexed values.
- Smaller memory footprint.
A compact array is composed of a index array and value array. The index
array contains the indicies of Unicode characters to the value array.
See Also: CompactCharArray
author:
Helena Shih |
| Constructor Summary | |
| public | CompactByteArray()
Default constructor for CompactByteArray, the default value of the
compact array is 0. | | public | CompactByteArray(byte defaultValue)
Constructor for CompactByteArray. | | public | CompactByteArray(char indexArray, byte newValues)
Constructor for CompactByteArray. | | public | CompactByteArray(String indexArray, String valueArray)
Constructor for CompactByteArray. |
| Method Summary | |
| final static boolean | arrayRegionMatches(byte[] source, int sourceStart, byte[] target, int targetStart, int len)
Convenience utility to compare two arrays of doubles. | | public Object | clone()
| | public void | compact()
Compact the array. | | public void | compact(boolean exhaustive)
Compact the array. | | public byte | elementAt(char index)
Get the mapped value of a Unicode character. | | public boolean | equals(Object obj)
Compares the equality of two compact array objects.
Parameters:
obj - the compact array object to be compared with this. | | public char[] | getIndexArray()
For internal use only. | | public byte[] | getValueArray()
For internal use only. | | public int | hashCode()
| | public void | setElementAt(char index, byte value)
Set a new value for a Unicode character. | | public void | setElementAt(char start, char end, byte value)
Set new values for a range of Unicode character. |
| UNICODECOUNT | | final public static int UNICODECOUNT(Code) | | The total number of Unicode characters.
|
| defaultValue | | byte defaultValue(Code) | | |
| CompactByteArray | | public CompactByteArray()(Code) | | Default constructor for CompactByteArray, the default value of the
compact array is 0.
|
| CompactByteArray | | public CompactByteArray(byte defaultValue)(Code) | | Constructor for CompactByteArray.
Parameters:
defaultValue - the default value of the compact array. |
| CompactByteArray | | public CompactByteArray(char indexArray, byte newValues)(Code) | | Constructor for CompactByteArray.
Parameters:
indexArray - the indicies of the compact array.
Parameters:
newValues - the values of the compact array.
exception:
IllegalArgumentException - If the index is out of range. |
| CompactByteArray | | public CompactByteArray(String indexArray, String valueArray)(Code) | | Constructor for CompactByteArray.
Parameters:
indexArray - the RLE-encoded indicies of the compact array.
Parameters:
valueArray - the RLE-encoded values of the compact array.
throws:
IllegalArgumentException - if the index or value array isthe wrong size. |
| arrayRegionMatches | | final static boolean arrayRegionMatches(byte[] source, int sourceStart, byte[] target, int targetStart, int len)(Code) | | Convenience utility to compare two arrays of doubles.
Parameters:
len - the length to compare.The start indices and start+len must be valid. |
| compact | | public void compact()(Code) | | Compact the array.
|
| compact | | public void compact(boolean exhaustive)(Code) | | Compact the array.
|
| elementAt | | public byte elementAt(char index)(Code) | | Get the mapped value of a Unicode character.
Parameters:
index - the character to get the mapped value with the mapped value of the given character |
| equals | | public boolean equals(Object obj)(Code) | | Compares the equality of two compact array objects.
Parameters:
obj - the compact array object to be compared with this. true if the current compact array object is the sameas the compact array object obj; false otherwise. |
| getIndexArray | | public char[] getIndexArray()(Code) | | For internal use only. Do not modify the result, the behavior of
modified results are undefined.
|
| getValueArray | | public byte[] getValueArray()(Code) | | For internal use only. Do not modify the result, the behavior of
modified results are undefined.
|
| hashCode | | public int hashCode()(Code) | | Generates the hash code for the compact array object
|
| setElementAt | | public void setElementAt(char index, byte value)(Code) | | Set a new value for a Unicode character.
Set automatically expands the array if it is compacted.
Parameters:
index - the character to set the mapped value with
Parameters:
value - the new mapped value |
| setElementAt | | public void setElementAt(char start, char end, byte value)(Code) | | Set new values for a range of Unicode character.
Parameters:
start - the starting offset of the range
Parameters:
end - the ending offset of the range
Parameters:
value - the new mapped value |
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