Compacts the data and builds an immutable CodePointTrie according to the parameters. After this, the mutable trie will be empty.

The mutable trie stores 32-bit values until buildImmutable() is called. If values shorter than 32 bits are to be stored in the immutable trie, then the upper bits are discarded. For example, when the mutable trie contains values 0x81, -0x7f, and 0xa581, and the value width is 8 bits, then each of these is stored as 0x81 and the immutable trie will return that as an unsigned value. (Some implementations may want to make productive temporary use of the upper bits until buildImmutable() discards them.)

Not every possible set of mappings can be built into a CodePointTrie, because of limitations resulting from speed and space optimizations. Every Unicode assigned character can be mapped to a unique value. Typical data yields data structures far smaller than the limitations.

It is possible to construct extremely unusual mappings that exceed the data structure limits. In such a case this function will throw an exception.

Parameters

type:CodePointTrie.Type

selects the trie type

valueWidth:CodePointTrie.ValueWidth

selects the number of bits in a trie data value; if smaller than 32 bits, then the values stored in the trie will be truncated first

ICU Status

Stable since ICU 63.

See Also

fromCodePointMap(CodePointMap)

Overrides java.lang.Object.clone.

Clones this mutable trie.

Returns:MutableCodePointTrie

the clone

Annotations

@Override

ICU Status

Stable since ICU 63.

Creates a mutable trie with the same contents as the CodePointMap.

Parameters

map:CodePointMap

the source map or trie

Returns:MutableCodePointTrie

the mutable trie

ICU Status

Stable since ICU 63.

Implements abstract com.ibm.icu.util.CodePointMap.get.

Doc from com.ibm.icu.util.CodePointMap.get.

Returns the value for a code point as stored in the map, with range checking. Returns an implementation-defined error value if c is not in the range 0..U+10FFFF.

Parameters

c:int

the code point

Returns:int

the map value, or an implementation-defined error value if the code point is not in the range 0..U+10FFFF

Annotations

@Override

ICU Status

Stable since ICU 63.

Implements abstract com.ibm.icu.util.CodePointMap.getRange.

Doc from com.ibm.icu.util.CodePointMap.getRange.

Sets the range object to a range of code points beginning with the start parameter. The range start is the same as the start input parameter (even if there are preceding code points that have the same value). The range end is the last code point such that all those from start to there have the same value. Returns false if start is not 0..U+10FFFF. Can be used to efficiently iterate over all same-value ranges in a map. (This is normally faster than iterating over code points and get()ting each value, but may be much slower than a data structure that stores ranges directly.)

If the ValueFilter parameter is not null, then the value to be delivered is passed through that filter, and the return value is the end of the range where all values are modified to the same actual value. The value is unchanged if that parameter is null.

Example:

int start = 0;
CodePointMap.Range range = new CodePointMap.Range();
while (map.getRange(start, null, range)) {
    int end = range.getEnd();
    int value = range.getValue();
    // Work with the range start..end and its value.
    start = end + 1;
}

The trie can be modified between calls to this function.

Parameters

start:int

range start

filter:CodePointMap.ValueFilter

an object that may modify the map data value, or null if the values from the map are to be used unmodified

range:CodePointMap.Range

the range object that will be set to the code point range and value

Returns:boolean

true if start is 0..U+10FFFF; otherwise no new range is fetched

Annotations

@Override

ICU Status

Stable since ICU 63.

Sets a value for a code point.

Parameters

c:int

the code point

value:int

the value

ICU Status

Stable since ICU 63.

Sets a value for each code point [start..end]. Faster and more space-efficient than setting the value for each code point separately.

Parameters

start:int

the first code point to get the value

end:int

the last code point to get the value (inclusive)

value:int

the value

ICU Status

Stable since ICU 63.