public class Segment extends Object implements Cloneable, CharacterIterator, CharSequence
A segment of a character array representing a fragment of text. It should be treated as immutable even though the array is directly accessible. This gives fast access to fragments of text without the overhead of copying around characters. This is effectively an unprotected String.
The Segment implements the java.text.CharacterIterator interface to support use with the i18n support without copying text into a string.
public char array
This is the array containing the text of interest. This array should never be modified; it is available only for efficiency.
public int offset
This is the offset into the array that the desired text begins.
public int count
This is the number of array elements that make up the text of interest.
Creates a new segment.
public Segment(char array, int offset, int count)
Creates a new segment referring to an existing array.
array- the array to refer to
offset- the offset into the array
count- the number of characters
public void setPartialReturn(boolean p)
Flag to indicate that partial returns are valid. If the flag is true, an implementation of the interface method Document.getText(position,length,Segment) should return as much text as possible without making a copy. The default state of the flag is false which will cause Document.getText(position,length,Segment) to provide the same return behavior it always had, which may or may not make a copy of the text depending upon the request.
p- whether or not partial returns are valid.
public boolean isPartialReturn()
Flag to indicate that partial returns are valid.
public String toString()
Converts a segment into a String.
public char first()
Sets the position to getBeginIndex() and returns the character at that position.
public char last()
Sets the position to getEndIndex()-1 (getEndIndex() if the text is empty) and returns the character at that position.
public char current()
Gets the character at the current position (as returned by getIndex()).
public char next()
Increments the iterator's index by one and returns the character at the new index. If the resulting index is greater or equal to getEndIndex(), the current index is reset to getEndIndex() and a value of DONE is returned.
public char previous()
Decrements the iterator's index by one and returns the character at the new index. If the current index is getBeginIndex(), the index remains at getBeginIndex() and a value of DONE is returned.
public char setIndex(int position)
Sets the position to the specified position in the text and returns that character.
position- the position within the text. Valid values range from getBeginIndex() to getEndIndex(). An IllegalArgumentException is thrown if an invalid value is supplied.
public int getBeginIndex()
Returns the start index of the text.
public int getEndIndex()
Returns the end index of the text. This index is the index of the first character following the end of the text.
public int getIndex()
Returns the current index.
public char charAt(int index)
char value at the specified index. An index ranges from zero to
length() - 1. The first
char value of the sequence is at index zero, the next at index one, and so on, as for array indexing.
char value specified by the index is a surrogate, the surrogate value is returned.
index- the index of the
charvalue to be returned
public int length()
Returns the length of this character sequence. The length is the number of 16-bit
chars in the sequence.
chars in this sequence
public CharSequence subSequence(int start, int end)
CharSequence that is a subsequence of this sequence. The subsequence starts with the
char value at the specified index and ends with the
char value at index
end - 1. The length (in
chars) of the returned sequence is
end - start, so if
start == end then an empty sequence is returned.
start- the start index, inclusive
end- the end index, exclusive
public Object clone()
Creates a shallow copy.
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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