java.lang.Object
javax.swing.text.AbstractDocument
javax.swing.text.PlainDocument
- All Implemented Interfaces:
Serializable
,Document
public class PlainDocument extends AbstractDocument
A plain document that maintains no character attributes. The
default element structure for this document is a map of the lines in
the text. The Element returned by getDefaultRootElement is
a map of the lines, and each child element represents a line.
This model does not maintain any character level attributes,
but each line can be tagged with an arbitrary set of attributes.
Line to offset, and offset to line translations can be quickly
performed using the default root element. The structure information
of the DocumentEvent's fired by edits will indicate the line
structure changes.
The default content storage management is performed by a gapped buffer implementation (GapContent). It supports editing reasonably large documents with good efficiency when the edits are contiguous or clustered, as is typical.
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
.
- See Also:
Document
,AbstractDocument
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Nested Class Summary
Nested classes/interfaces declared in class javax.swing.text.AbstractDocument
AbstractDocument.AbstractElement, AbstractDocument.AttributeContext, AbstractDocument.BranchElement, AbstractDocument.Content, AbstractDocument.DefaultDocumentEvent, AbstractDocument.ElementEdit, AbstractDocument.LeafElement
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Field Summary
Fields Modifier and Type Field Description static String
lineLimitAttribute
Name of the attribute that specifies the maximum length of a line, if there is a maximum length.static String
tabSizeAttribute
Name of the attribute that specifies the tab size for tabs contained in the content.Fields declared in class javax.swing.text.AbstractDocument
BAD_LOCATION, BidiElementName, ContentElementName, ElementNameAttribute, listenerList, ParagraphElementName, SectionElementName
Fields declared in interface javax.swing.text.Document
StreamDescriptionProperty, TitleProperty
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Constructor Summary
Constructors Constructor Description PlainDocument()
Constructs a plain text document.PlainDocument(AbstractDocument.Content c)
Constructs a plain text document. -
Method Summary
Modifier and Type Method Description protected AbstractDocument.AbstractElement
createDefaultRoot()
Creates the root element to be used to represent the default document structure.Element
getDefaultRootElement()
Gets the default root element for the document model.Element
getParagraphElement(int pos)
Get the paragraph element containing the given position.void
insertString(int offs, String str, AttributeSet a)
Inserts some content into the document.protected void
insertUpdate(AbstractDocument.DefaultDocumentEvent chng, AttributeSet attr)
Updates document structure as a result of text insertion.protected void
removeUpdate(AbstractDocument.DefaultDocumentEvent chng)
Updates any document structure as a result of text removal.Methods declared in class javax.swing.text.AbstractDocument
addDocumentListener, addUndoableEditListener, createBranchElement, createLeafElement, createPosition, dump, fireChangedUpdate, fireInsertUpdate, fireRemoveUpdate, fireUndoableEditUpdate, getAsynchronousLoadPriority, getAttributeContext, getBidiRootElement, getContent, getCurrentWriter, getDocumentFilter, getDocumentListeners, getDocumentProperties, getEndPosition, getLength, getListeners, getProperty, getRootElements, getStartPosition, getText, getText, getUndoableEditListeners, postRemoveUpdate, putProperty, readLock, readUnlock, remove, removeDocumentListener, removeUndoableEditListener, render, replace, setAsynchronousLoadPriority, setDocumentFilter, setDocumentProperties, writeLock, writeUnlock
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Field Details
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tabSizeAttribute
Name of the attribute that specifies the tab size for tabs contained in the content. The type for the value is Integer.- See Also:
- Constant Field Values
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lineLimitAttribute
Name of the attribute that specifies the maximum length of a line, if there is a maximum length. The type for the value is Integer.- See Also:
- Constant Field Values
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Constructor Details
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PlainDocument
public PlainDocument()Constructs a plain text document. A default model usingGapContent
is constructed and set. -
PlainDocument
Constructs a plain text document. A default root element is created, and the tab size set to 8.- Parameters:
c
- the container for the content
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Method Details
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insertString
Inserts some content into the document. Inserting content causes a write lock to be held while the actual changes are taking place, followed by notification to the observers on the thread that grabbed the write lock.This method is thread safe, although most Swing methods are not. Please see Concurrency in Swing for more information.
- Specified by:
insertString
in interfaceDocument
- Overrides:
insertString
in classAbstractDocument
- Parameters:
offs
- the starting offset >= 0str
- the string to insert; does nothing with null/empty stringsa
- the attributes for the inserted content- Throws:
BadLocationException
- the given insert position is not a valid position within the document- See Also:
Document.insertString(int, java.lang.String, javax.swing.text.AttributeSet)
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getDefaultRootElement
Gets the default root element for the document model.- Specified by:
getDefaultRootElement
in interfaceDocument
- Specified by:
getDefaultRootElement
in classAbstractDocument
- Returns:
- the root
- See Also:
Document.getDefaultRootElement()
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createDefaultRoot
Creates the root element to be used to represent the default document structure.- Returns:
- the element base
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getParagraphElement
Get the paragraph element containing the given position. Since this document only models lines, it returns the line instead.- Specified by:
getParagraphElement
in classAbstractDocument
- Parameters:
pos
- the starting offset >= 0- Returns:
- the element
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insertUpdate
Updates document structure as a result of text insertion. This will happen within a write lock. Since this document simply maps out lines, we refresh the line map.- Overrides:
insertUpdate
in classAbstractDocument
- Parameters:
chng
- the change event describing the ditattr
- the set of attributes for the inserted text
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removeUpdate
Updates any document structure as a result of text removal. This will happen within a write lock. Since the structure represents a line map, this just checks to see if the removal spans lines. If it does, the two lines outside of the removal area are joined together.- Overrides:
removeUpdate
in classAbstractDocument
- Parameters:
chng
- the change event describing the edit
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