java.lang.Object
javax.swing.text.StringContent
- All Implemented Interfaces:
Serializable
,AbstractDocument.Content
public final class StringContent extends Object implements AbstractDocument.Content, Serializable
An implementation of the AbstractDocument.Content interface that is
a brute force implementation that is useful for relatively small
documents and/or debugging. It manages the character content
as a simple character array. It is also quite inefficient.
It is generally recommended that the gap buffer or piece table implementations be used instead. This buffer does not scale up to large sizes.
Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeans
has been added to the java.beans
package.
Please see XMLEncoder
.
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Constructor Summary
Constructors Constructor Description StringContent()
Creates a new StringContent object.StringContent(int initialLength)
Creates a new StringContent object, with the initial size specified. -
Method Summary
Modifier and Type Method Description Position
createPosition(int offset)
Creates a position within the content that will track change as the content is mutated.void
getChars(int where, int len, Segment chars)
Retrieves a portion of the content.protected Vector
getPositionsInRange(Vector v, int offset, int length)
Returns a Vector containing instances of UndoPosRef for the Positions in the rangeoffset
tooffset
+length
.String
getString(int where, int len)
Retrieves a portion of the content.UndoableEdit
insertString(int where, String str)
Inserts a string into the content.int
length()
Returns the length of the content.UndoableEdit
remove(int where, int nitems)
Removes part of the content.protected void
updateUndoPositions(Vector positions)
Resets the location for all the UndoPosRef instances inpositions
.
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Constructor Details
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StringContent
public StringContent()Creates a new StringContent object. Initial size defaults to 10. -
StringContent
public StringContent(int initialLength)Creates a new StringContent object, with the initial size specified. If the length is < 1, a size of 1 is used.- Parameters:
initialLength
- the initial size
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Method Details
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length
public int length()Returns the length of the content.- Specified by:
length
in interfaceAbstractDocument.Content
- Returns:
- the length >= 1
- See Also:
AbstractDocument.Content.length()
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insertString
Inserts a string into the content.- Specified by:
insertString
in interfaceAbstractDocument.Content
- Parameters:
where
- the starting position >= 0 && < length()str
- the non-null string to insert- Returns:
- an UndoableEdit object for undoing
- Throws:
BadLocationException
- if the specified position is invalid- See Also:
AbstractDocument.Content.insertString(int, java.lang.String)
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remove
Removes part of the content. where + nitems must be < length().- Specified by:
remove
in interfaceAbstractDocument.Content
- Parameters:
where
- the starting position >= 0nitems
- the number of characters to remove >= 0- Returns:
- an UndoableEdit object for undoing
- Throws:
BadLocationException
- if the specified position is invalid- See Also:
AbstractDocument.Content.remove(int, int)
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getString
Retrieves a portion of the content. where + len must be <= length().- Specified by:
getString
in interfaceAbstractDocument.Content
- Parameters:
where
- the starting position >= 0len
- the length to retrieve >= 0- Returns:
- a string representing the content; may be empty
- Throws:
BadLocationException
- if the specified position is invalid- See Also:
AbstractDocument.Content.getString(int, int)
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getChars
Retrieves a portion of the content. where + len must be <= length()- Specified by:
getChars
in interfaceAbstractDocument.Content
- Parameters:
where
- the starting position >= 0len
- the number of characters to retrieve >= 0chars
- the Segment object to return the characters in- Throws:
BadLocationException
- if the specified position is invalid- See Also:
AbstractDocument.Content.getChars(int, int, javax.swing.text.Segment)
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createPosition
Creates a position within the content that will track change as the content is mutated.- Specified by:
createPosition
in interfaceAbstractDocument.Content
- Parameters:
offset
- the offset to create a position for >= 0- Returns:
- the position
- Throws:
BadLocationException
- if the specified position is invalid
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getPositionsInRange
Returns a Vector containing instances of UndoPosRef for the Positions in the rangeoffset
tooffset
+length
. Ifv
is not null the matching Positions are placed in there. The vector with the resulting Positions are returned.This is meant for internal usage, and is generally not of interest to subclasses.
- Parameters:
v
- the Vector to use, with a new one created on nulloffset
- the starting offset >= 0length
- the length >= 0- Returns:
- the set of instances
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updateUndoPositions
Resets the location for all the UndoPosRef instances inpositions
.This is meant for internal usage, and is generally not of interest to subclasses.
- Parameters:
positions
- the positions of the instances
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