public class BidiTransform
extends java.lang.Object
Layout transformations allow converting a given instance of BidiText (the source) into another instance (the destination) with possibly different Bidi flags while conserving the semantics of the text.
Bidi text is a combination of a sequence of characters and a set of Bidi flags. Bidi text is implemented by the BidiText class.
A BidiTransform instance contains fields which define what auxiliary outputs are required from the transformation, and fields to refer to these outputs. The work itself is done by the transform method of the BidiText class.
Boolean fields are used to specify options of the transform operation. Other fields are used to store auxiliary outputs of the transformation.
There are no specific constructors for this class. The default constructor creates a default BidiFlagSet and puts its reference in the "flags" instance member. Unless modified later, this qualifies a transformation to Implicit LTR swapped numerals-nominal unshaped text.
Multi-threading considerations: each thread must use its own instances of this class.
| Modifier and Type | Field and Description |
|---|---|
boolean |
continuation
Option: this invocation is a continuation from the previous one
(re-establish same conditions as at the end of last call)
|
java.lang.String |
delimiters
Option: delimiters for performing the Bidi transformation.
|
boolean |
destinationRequired
Option: create a destination BidiText
If this flag is not true, the transform method will return a null.
|
int[] |
dstToSrcMap
Output value: destination-to-source map from the last transform with
dstToSrcMapRequired specified; if this option was not specified, the
content of dstToSrcMap should be ignored.
|
boolean |
dstToSrcMapRequired
Option: create a destination to source mapping
|
BidiFlagSet |
flags
Option: Bidi flags of destination BidiText
|
boolean |
impToImp
Option: enable Implicit to Implicit transformations
|
int |
inpCount
Output value: number of characters processed in the source data by
the last transform
|
boolean |
insertMarkers
Option: add Markers to destination text when needed for round trip.
|
com.ibm.as400.access.ArabicOptionSet |
options
Option: shaping options for this transformation
|
int |
outCount
Output value: number of characters written in the destination data by
the last transform
|
byte[] |
propertyMap
Output value: property map from the last transform with
propertyMapRequired specified; if this option was not specified, the
content of propertyMap should be ignored.
|
boolean |
propertyMapRequired
Option: create a property map
Note: the map created is of no practical value if impToImp is true.
|
boolean |
removeMarkers
Option: remove Markers from destination text after performing a Bidi
transformation.
|
boolean |
roundTrip
Option: use "roundtrip" algorithm for reordering
|
int[] |
srcToDstMap
Output value: source-to-destination map from the last transform with
srcToDstMapRequired specified; if this option was not specified, the
content of srcToDstMap should be ignored.
|
boolean |
srcToDstMapRequired
Option: create a source to destination mapping
|
boolean |
winCompatible
Option: use "Windows compatible" algorithm for reordering.
|
boolean |
wordBreak
Option: consider white space to always follow base orientation
|
| Constructor and Description |
|---|
BidiTransform() |
public BidiFlagSet flags
public boolean impToImp
public boolean roundTrip
public boolean winCompatible
If this option is true, the reordering algorithm is modified to perform more closely like Windows. In particular, logical string "12ABC" in LTR orientation (where ABC represent Arabic or Hebrew letters) is reordered as "CBA12" instead of "12CBA". Also, logical string "abc 123 45" (where all digits represent Hindi numbers) is reordered as "abc 123 45" instead of "abc 45 123".
public boolean insertMarkers
If this option is true, LRM and RLM markers may be inserted when transforming from visual to logical where needed to insure round trip.
This option is ignored if the removeMarkers option is true.
public boolean removeMarkers
If this option is true, LRM and RLM markers in the source text participate in the reordering, but they are removed from the destination text after performing the Bidi transformation.
public java.lang.String delimiters
This option is enabled if the string "delimiters" is not null and has a length of at least one character. This string specifies starting and ending delimiters such that the Bidi transformation is only performed on the data between starting and ending delimiters.
If the length of the string is only one character, the ending delimiter is assumed equal to the starting delimiter.
An even number of successive ending delimiters in the data to transform is considered part of the data and do not function as delimiters. In an odd number of successive ending delimiters, the last one is considered as a delimiter.
public com.ibm.as400.access.ArabicOptionSet options
public boolean wordBreak
public boolean destinationRequired
If this flag is not true, the transform method will return a null.
public boolean srcToDstMapRequired
public boolean dstToSrcMapRequired
public boolean propertyMapRequired
Note: the map created is of no practical value if impToImp is true.
public boolean continuation
public int inpCount
public int outCount
public int[] srcToDstMap
If when starting a transformation this field refers to a large enough array of integers, this array will be re-used to put the new map. Otherwise a new array will be created.
This map has a number for each character processed in the source data by the last transform. This number is the index of where this character is moved in the character array of the destination BidiText. If the removeMarkers option was specified and LRM or RLM markers have been removed from the destination text, the corresponding elements of srcToDstMap will contain -1.
Note that the allocated array may have more elements than the number of characters processed in the source BidiText. In that case, the extra elements should be ignored. The number of relevant elements can be found in inpCount.
public int[] dstToSrcMap
If when starting a transformation this field refers to a large enough array of integers, this array will be re-used to put the new map. Otherwise a new array will be created.
This map has a number for each character in the "interesting" data of the destination BidiText. This number is the index of the source character from which the destination character originates. This index is relative to the beginning of the "interesting" data. If the offset of the source BidiText is not zero, index 0 does not indicate the first character of the data array, but the character at position "offset". If the insertMarkers option was specified and LRM or RLM markers have been added, the corresponding elements of dstToSrcMap will contain -1.
Note that the allocated array may have more elements than the number of characters in the "interesting" part of the destination BidiText. In that case, the extra elements should be ignored. The number of relevant elements can be found in outCount.
public byte[] propertyMap
If when starting a transformation this field refers to a large enough array of bytes, this array will be re-used to put the new map. Otherwise a new array will be created.
This map has a byte for each character processed in the source data by the last transform. The 6 lower bits of each property element is the Bidi level of the corresponding input character. The highest bit is a new-cell indicator for composed character environments: a value of 0 indicates a zero-length composing character element, and a value of 1 indicates an element that begins a new cell.
Note: the content of this map has no simple interpretation if impToImp is true.
Note also that the allocated array may have more elements than the number of characters processed in the source BidiText. In that case, the extra elements should be ignored. The number of relevant elements can be found in inpCount.