public class HTMLDocument extends DefaultStyledDocument
HTMLDocument.HTMLReader, which implements the
HTMLEditorKit.ParserCallback protocol that the parser
expects. To change the structure one can subclass
HTMLReader, and reimplement the method getReader(int) to return the new reader implementation. The
documentation for HTMLReader should be consulted for
the details of the default structure created. The intent is that
the document be non-lossy (although reproducing the HTML format may
result in a different format).
The document models only HTML, and makes no attempt to store
view attributes in it. The elements are identified by the
StyleContext.NameAttribute attribute, which should
always have a value of type HTML.Tag that identifies
the kind of element. Some of the elements (such as comments) are
synthesized. The HTMLFactory uses this attribute to
determine what kind of view to build.
This document supports incremental loading. The
TokenThreshold property controls how much of the parse
is buffered before trying to update the element structure of the
document. This property is set by the EditorKit so
that subclasses can disable it.
The Base property determines the URL against which
relative URLs are resolved. By default, this will be the
Document.StreamDescriptionProperty if the value of the
property is a URL. If a <BASE> tag is encountered, the base
will become the URL specified by that tag. Because the base URL is
a property, it can of course be set directly.
The default content storage mechanism for this document is a gap
buffer (GapContent). Alternatives can be supplied by
using the constructor that takes a Content
implementation.
In addition to the methods provided by Document and StyledDocument for mutating an HTMLDocument, HTMLDocument provides a number of convenience methods. The following methods can be used to insert HTML content into an existing document.
setInnerHTML(Element, String)setOuterHTML(Element, String)insertBeforeStart(Element, String)insertAfterStart(Element, String)insertBeforeEnd(Element, String)insertAfterEnd(Element, String)The following examples illustrate using these methods. Each example assumes the HTML document is initialized in the following way:
JEditorPane p = new JEditorPane();
p.setContentType("text/html");
p.setText("..."); // Document text is provided below.
HTMLDocument d = (HTMLDocument) p.getDocument();
With the following HTML content:
<html>
<head>
<title>An example HTMLDocument</title>
<style type="text/css">
div { background-color: silver; }
ul { color: red; }
</style>
</head>
<body>
<div id="BOX">
<p>Paragraph 1</p>
<p>Paragraph 2</p>
</div>
</body>
</html>
All the methods for modifying an HTML document require an Element. Elements can be obtained from an HTML document by using
the method getElement(Element e, Object attribute, Object
value). It returns the first descendant element that contains the
specified attribute with the given value, in depth-first order.
For example, d.getElement(d.getDefaultRootElement(),
StyleConstants.NameAttribute, HTML.Tag.P) returns the first
paragraph element.
A convenient shortcut for locating elements is the method getElement(String); returns an element whose ID
attribute matches the specified value. For example,
d.getElement("BOX") returns the DIV
element.
The getIterator(HTML.Tag t) method can also be used for
finding all occurrences of the specified HTML tag in the
document.
Elements can be inserted before or after the existing children
of any non-leaf element by using the methods
insertAfterStart and insertBeforeEnd.
For example, if e is the DIV element,
d.insertAfterStart(e, "<ul><li>List
Item</li></ul>") inserts the list before the first
paragraph, and d.insertBeforeEnd(e, "<ul><li>List
Item</li></ul>") inserts the list after the last
paragraph. The DIV block becomes the parent of the
newly inserted elements.
Sibling elements can be inserted before or after any element by
using the methods insertBeforeStart and
insertAfterEnd. For example, if e is the
DIV element, d.insertBeforeStart(e,
"<ul><li>List Item</li></ul>") inserts the list
before the DIV element, and d.insertAfterEnd(e,
"<ul><li>List Item</li></ul>") inserts the list
after the DIV element. The newly inserted elements
become siblings of the DIV element.
Elements and all their descendants can be replaced by using the
methods setInnerHTML and setOuterHTML.
For example, if e is the DIV element,
d.setInnerHTML(e, "<ul><li>List
Item</li></ul>") replaces all children paragraphs with
the list, and d.setOuterHTML(e, "<ul><li>List
Item</li></ul>") replaces the DIV element
itself. In latter case the parent of the list is the
BODY element.
The following table shows the example document and the results of various methods described above.
| Example | insertAfterStart |
insertBeforeEnd |
insertBeforeStart |
insertAfterEnd |
setInnerHTML |
setOuterHTML |
|---|---|---|---|---|---|---|
|
Paragraph 1 Paragraph 2 |
Paragraph 1 Paragraph 2 |
Paragraph 1 Paragraph 2
|
Paragraph 1 Paragraph 2 |
Paragraph 1 Paragraph 2
|
|
|
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 JavaBeansTM has been added to the
java.beans package. Please see XMLEncoder.
| Modifier and Type | Class and Description |
|---|---|
class |
HTMLDocument.BlockElement
An element that represents a structural block of
HTML.
|
class |
HTMLDocument.HTMLReader
An HTML reader to load an HTML document with an HTML
element structure.
|
static class |
HTMLDocument.Iterator
An iterator to iterate over a particular type of
tag.
|
class |
HTMLDocument.RunElement
An element that represents a chunk of text that has
a set of HTML character level attributes assigned to
it.
|
DefaultStyledDocument.AttributeUndoableEdit, DefaultStyledDocument.ElementBuffer, DefaultStyledDocument.ElementSpec, DefaultStyledDocument.SectionElementAbstractDocument.AbstractElement, AbstractDocument.AttributeContext, AbstractDocument.BranchElement, AbstractDocument.Content, AbstractDocument.DefaultDocumentEvent, AbstractDocument.ElementEdit, AbstractDocument.LeafElement| Modifier and Type | Field and Description |
|---|---|
static String |
AdditionalComments
Document property key value.
|
buffer, BUFFER_SIZE_DEFAULTBAD_LOCATION, BidiElementName, ContentElementName, ElementNameAttribute, listenerList, ParagraphElementName, SectionElementNameStreamDescriptionProperty, TitleProperty| Constructor and Description |
|---|
HTMLDocument()
Constructs an HTML document using the default buffer size
and a default
StyleSheet. |
HTMLDocument(AbstractDocument.Content c,
StyleSheet styles)
Constructs an HTML document with the given content
storage implementation and the given style/attribute
storage mechanism.
|
HTMLDocument(StyleSheet styles)
Constructs an HTML document with the default content
storage implementation and the specified style/attribute
storage mechanism.
|
| Modifier and Type | Method and Description |
|---|---|
protected void |
create(DefaultStyledDocument.ElementSpec[] data)
Replaces the contents of the document with the given
element specifications.
|
protected Element |
createBranchElement(Element parent,
AttributeSet a)
Creates a document branch element, that can contain other elements.
|
protected AbstractDocument.AbstractElement |
createDefaultRoot()
Creates the root element to be used to represent the
default document structure.
|
protected Element |
createLeafElement(Element parent,
AttributeSet a,
int p0,
int p1)
Creates a document leaf element that directly represents
text (doesn't have any children).
|
protected void |
fireChangedUpdate(DocumentEvent e)
Notifies all listeners that have registered interest for
notification on this event type.
|
protected void |
fireUndoableEditUpdate(UndoableEditEvent e)
Notifies all listeners that have registered interest for
notification on this event type.
|
URL |
getBase()
Returns the location to resolve relative URLs against.
|
Element |
getElement(Element e,
Object attribute,
Object value)
Returns the child element of
e that contains the
attribute, attribute with value value, or
null if one isn't found. |
Element |
getElement(String id)
Returns the element that has the given id
Attribute. |
HTMLDocument.Iterator |
getIterator(HTML.Tag t)
Fetches an iterator for the specified HTML tag.
|
HTMLEditorKit.Parser |
getParser()
Returns the parser that is used when inserting HTML into the existing
document.
|
boolean |
getPreservesUnknownTags()
Returns the behavior the parser observes when encountering
unknown tags.
|
HTMLEditorKit.ParserCallback |
getReader(int pos)
Fetches the reader for the parser to use when loading the document
with HTML.
|
HTMLEditorKit.ParserCallback |
getReader(int pos,
int popDepth,
int pushDepth,
HTML.Tag insertTag)
Returns the reader for the parser to use to load the document
with HTML.
|
StyleSheet |
getStyleSheet()
Fetches the
StyleSheet with the document-specific display
rules (CSS) that were specified in the HTML document itself. |
int |
getTokenThreshold()
Gets the number of tokens to buffer before trying to update
the documents element structure.
|
protected void |
insert(int offset,
DefaultStyledDocument.ElementSpec[] data)
Inserts new elements in bulk.
|
void |
insertAfterEnd(Element elem,
String htmlText)
Inserts the HTML specified as a string after the the end of the
given element.
|
void |
insertAfterStart(Element elem,
String htmlText)
Inserts the HTML specified as a string at the start
of the element.
|
void |
insertBeforeEnd(Element elem,
String htmlText)
Inserts the HTML specified as a string at the end of
the element.
|
void |
insertBeforeStart(Element elem,
String htmlText)
Inserts the HTML specified as a string before the start of
the given element.
|
protected void |
insertUpdate(AbstractDocument.DefaultDocumentEvent chng,
AttributeSet attr)
Updates document structure as a result of text insertion.
|
void |
processHTMLFrameHyperlinkEvent(HTMLFrameHyperlinkEvent e)
Processes
HyperlinkEvents that
are generated by documents in an HTML frame. |
void |
setBase(URL u)
Sets the location to resolve relative URLs against.
|
void |
setInnerHTML(Element elem,
String htmlText)
Replaces the children of the given element with the contents
specified as an HTML string.
|
void |
setOuterHTML(Element elem,
String htmlText)
Replaces the given element in the parent with the contents
specified as an HTML string.
|
void |
setParagraphAttributes(int offset,
int length,
AttributeSet s,
boolean replace)
Sets attributes for a paragraph.
|
void |
setParser(HTMLEditorKit.Parser parser)
Sets the parser that is used by the methods that insert html
into the existing document, such as
setInnerHTML,
and setOuterHTML. |
void |
setPreservesUnknownTags(boolean preservesTags)
Determines how unknown tags are handled by the parser.
|
void |
setTokenThreshold(int n)
Sets the number of tokens to buffer before trying to update
the documents element structure.
|
addDocumentListener, addStyle, getBackground, getCharacterElement, getDefaultRootElement, getFont, getForeground, getLogicalStyle, getParagraphElement, getStyle, getStyleNames, removeDocumentListener, removeElement, removeStyle, removeUpdate, setCharacterAttributes, setLogicalStyle, styleChangedaddUndoableEditListener, createPosition, dump, fireInsertUpdate, fireRemoveUpdate, getAsynchronousLoadPriority, getAttributeContext, getBidiRootElement, getContent, getCurrentWriter, getDocumentFilter, getDocumentListeners, getDocumentProperties, getEndPosition, getLength, getListeners, getProperty, getRootElements, getStartPosition, getText, getText, getUndoableEditListeners, insertString, postRemoveUpdate, putProperty, readLock, readUnlock, remove, removeUndoableEditListener, render, replace, setAsynchronousLoadPriority, setDocumentFilter, setDocumentProperties, writeLock, writeUnlockclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitaddUndoableEditListener, createPosition, getEndPosition, getLength, getProperty, getRootElements, getStartPosition, getText, getText, insertString, putProperty, remove, removeUndoableEditListener, renderpublic static final String AdditionalComments
public HTMLDocument()
StyleSheet. This is a convenience
method for the constructor
HTMLDocument(Content, StyleSheet).public HTMLDocument(StyleSheet styles)
HTMLDocument(Content, StyleSheet).styles - the stylespublic HTMLDocument(AbstractDocument.Content c, StyleSheet styles)
c - the container for the contentstyles - the stylespublic HTMLEditorKit.ParserCallback getReader(int pos)
HTMLDocument.HTMLReader.
Subclasses can reimplement this
method to change how the document gets structured if desired.
(For example, to handle custom tags, or structurally represent character
style elements.)pos - the starting positionpublic HTMLEditorKit.ParserCallback getReader(int pos, int popDepth, int pushDepth, HTML.Tag insertTag)
HTMLDocument.HTMLReader.
Subclasses can reimplement this
method to change how the document gets structured if desired.
(For example, to handle custom tags, or structurally represent character
style elements.)
This is a convenience method for
getReader(int, int, int, HTML.Tag, TRUE).
popDepth - the number of ElementSpec.EndTagTypes
to generate before insertingpushDepth - the number of ElementSpec.StartTagTypes
with a direction of ElementSpec.JoinNextDirection
that should be generated before inserting,
but after the end tags have been generatedinsertTag - the first tag to start inserting into documentpublic URL getBase()
public void setBase(URL u)
This also sets the base of the StyleSheet
to be u as well as the base of the document.
u - the desired base URLprotected void insert(int offset,
DefaultStyledDocument.ElementSpec[] data)
throws BadLocationException
insert in class DefaultStyledDocumentoffset - the starting offsetdata - the element dataBadLocationException - if the given position does not
represent a valid location in the associated document.protected void insertUpdate(AbstractDocument.DefaultDocumentEvent chng, AttributeSet attr)
insertUpdate in class DefaultStyledDocumentchng - a description of the document changeattr - the attributesprotected void create(DefaultStyledDocument.ElementSpec[] data)
create in class DefaultStyledDocumentdata - the new contents of the documentpublic void setParagraphAttributes(int offset,
int length,
AttributeSet s,
boolean replace)
This method is thread safe, although most Swing methods are not. Please see How to Use Threads for more information.
setParagraphAttributes in interface StyledDocumentsetParagraphAttributes in class DefaultStyledDocumentoffset - the offset into the paragraph (must be at least 0)length - the number of characters affected (must be at least 0)s - the attributesreplace - whether to replace existing attributes, or merge thempublic StyleSheet getStyleSheet()
StyleSheet with the document-specific display
rules (CSS) that were specified in the HTML document itself.StyleSheetpublic HTMLDocument.Iterator getIterator(HTML.Tag t)
t - the requested HTML.TagIterator for the given HTML tagHTML.Tagprotected Element createLeafElement(Element parent, AttributeSet a, int p0, int p1)
HTMLDocument.RunElement.createLeafElement in class AbstractDocumentparent - the parent elementa - the attributes for the elementp0 - the beginning of the range (must be at least 0)p1 - the end of the range (must be at least p0)protected Element createBranchElement(Element parent, AttributeSet a)
HTMLDocument.BlockElement.createBranchElement in class AbstractDocumentparent - the parent elementa - the attributesprotected AbstractDocument.AbstractElement createDefaultRoot()
createDefaultRoot in class DefaultStyledDocumentpublic void setTokenThreshold(int n)
n - the number of tokens to bufferpublic int getTokenThreshold()
Integer.MAX_VALUE.public void setPreservesUnknownTags(boolean preservesTags)
preservesTags - true if unknown tags should be
saved in the model, otherwise tags are droppedHTML.Tagpublic boolean getPreservesUnknownTags()
HTML.Tagpublic void processHTMLFrameHyperlinkEvent(HTMLFrameHyperlinkEvent e)
HyperlinkEvents that
are generated by documents in an HTML frame.
The HyperlinkEvent type, as the parameter suggests,
is HTMLFrameHyperlinkEvent.
In addition to the typical information contained in a
HyperlinkEvent,
this event contains the element that corresponds to the frame in
which the click happened (the source element) and the
target name. The target name has 4 possible values:
HTML.Attribute.SRC attribute and fires a
ChangedUpdate event.
If the target is _parent, then it deletes the parent element,
which is a <FRAMESET> element, and inserts a new <FRAME>
element, and sets its HTML.Attribute.SRC attribute
to have a value equal to the destination URL and fire a
RemovedUpdate and InsertUpdate.
If the target is _top, this method does nothing. In the implementation
of the view for a frame, namely the FrameView,
the processing of _top is handled. Given that _top implies
replacing the entire document, it made sense to handle this outside
of the document that it will replace.
If the target is a named frame, then the element hierarchy is searched
for an element with a name equal to the target, its
HTML.Attribute.SRC attribute is updated and a
ChangedUpdate event is fired.
e - the eventpublic void setParser(HTMLEditorKit.Parser parser)
setInnerHTML,
and setOuterHTML.
HTMLEditorKit.createDefaultDocument will set the parser
for you. If you create an HTMLDocument by hand,
be sure and set the parser accordingly.
parser - the parser to be used for text insertionpublic HTMLEditorKit.Parser getParser()
public void setInnerHTML(Element elem, String htmlText) throws BadLocationException, IOException
This will be seen as at least two events, n inserts followed by a remove.
Consider the following structure (the elem
parameter is in bold).
<body>
|
<div>
/ \
<p> <p>
Invoking setInnerHTML(elem, "<ul><li>")
results in the following structure (new elements are in red).
<body>
|
<div>
\
<ul>
\
<li>
Parameter elem must not be a leaf element,
otherwise an IllegalArgumentException is thrown.
If either elem or htmlText parameter
is null, no changes are made to the document.
For this to work correcty, the document must have an
HTMLEditorKit.Parser set. This will be the case
if the document was created from an HTMLEditorKit via the
createDefaultDocument method.
elem - the branch element whose children will be replacedhtmlText - the string to be parsed and assigned to elemIllegalArgumentException - if elem is a leafIllegalStateException - if an HTMLEditorKit.Parser
has not been definedBadLocationExceptionIOExceptionpublic void setOuterHTML(Element elem, String htmlText) throws BadLocationException, IOException
This will be seen as at least two events, n inserts followed by a remove.
When replacing a leaf this will attempt to make sure there is a newline present if one is needed. This may result in an additional element being inserted. Consider, if you were to replace a character element that contained a newline with <img> this would create two elements, one for the image, ane one for the newline.
If you try to replace the element at length you will most
likely end up with two elements, eg
setOuterHTML(getCharacterElement (getLength()),
"blah") will result in two leaf elements at the end, one
representing 'blah', and the other representing the end
element.
Consider the following structure (the elem
parameter is in bold).
<body>
|
<div>
/ \
<p> <p>
Invoking setOuterHTML(elem, "<ul><li>")
results in the following structure (new elements are in red).
<body>
|
<ul>
\
<li>
If either elem or htmlText
parameter is null, no changes are made to the
document.
For this to work correcty, the document must have an
HTMLEditorKit.Parser set. This will be the case if the document
was created from an HTMLEditorKit via the
createDefaultDocument method.
elem - the element to replacehtmlText - the string to be parsed and inserted in place of elemIllegalStateException - if an HTMLEditorKit.Parser has not
been setBadLocationExceptionIOExceptionpublic void insertAfterStart(Element elem, String htmlText) throws BadLocationException, IOException
Consider the following structure (the elem
parameter is in bold).
<body>
|
<div>
/ \
<p> <p>
Invoking insertAfterStart(elem,
"<ul><li>") results in the following structure
(new elements are in red).
<body>
|
<div>
/ | \
<ul> <p> <p>
/
<li>
Unlike the insertBeforeStart method, new
elements become children of the specified element,
not siblings.
Parameter elem must not be a leaf element,
otherwise an IllegalArgumentException is thrown.
If either elem or htmlText parameter
is null, no changes are made to the document.
For this to work correcty, the document must have an
HTMLEditorKit.Parser set. This will be the case
if the document was created from an HTMLEditorKit via the
createDefaultDocument method.
elem - the branch element to be the root for the new texthtmlText - the string to be parsed and assigned to elemIllegalArgumentException - if elem is a leafIllegalStateException - if an HTMLEditorKit.Parser has not
been set on the documentBadLocationExceptionIOExceptionpublic void insertBeforeEnd(Element elem, String htmlText) throws BadLocationException, IOException
If elem's children are leaves, and the
character at a elem.getEndOffset() - 1 is a newline,
this will insert before the newline so that there isn't text after
the newline.
Consider the following structure (the elem
parameter is in bold).
<body>
|
<div>
/ \
<p> <p>
Invoking insertBeforeEnd(elem, "<ul><li>")
results in the following structure (new elements are in red).
<body>
|
<div>
/ | \
<p> <p> <ul>
\
<li>
Unlike the insertAfterEnd method, new elements
become children of the specified element, not
siblings.
Parameter elem must not be a leaf element,
otherwise an IllegalArgumentException is thrown.
If either elem or htmlText parameter
is null, no changes are made to the document.
For this to work correcty, the document must have an
HTMLEditorKit.Parser set. This will be the case
if the document was created from an HTMLEditorKit via the
createDefaultDocument method.
elem - the element to be the root for the new texthtmlText - the string to be parsed and assigned to elemIllegalArgumentException - if elem is a leafIllegalStateException - if an HTMLEditorKit.Parser has not
been set on the documentBadLocationExceptionIOExceptionpublic void insertBeforeStart(Element elem, String htmlText) throws BadLocationException, IOException
Consider the following structure (the elem
parameter is in bold).
<body>
|
<div>
/ \
<p> <p>
Invoking insertBeforeStart(elem,
"<ul><li>") results in the following structure
(new elements are in red).
<body>
/ \
<ul> <div>
/ / \
<li> <p> <p>
Unlike the insertAfterStart method, new
elements become siblings of the specified element, not
children.
If either elem or htmlText
parameter is null, no changes are made to the
document.
For this to work correcty, the document must have an
HTMLEditorKit.Parser set. This will be the case
if the document was created from an HTMLEditorKit via the
createDefaultDocument method.
elem - the element the content is inserted beforehtmlText - the string to be parsed and inserted before elemIllegalStateException - if an HTMLEditorKit.Parser has not
been set on the documentBadLocationExceptionIOExceptionpublic void insertAfterEnd(Element elem, String htmlText) throws BadLocationException, IOException
Consider the following structure (the elem
parameter is in bold).
<body>
|
<div>
/ \
<p> <p>
Invoking insertAfterEnd(elem, "<ul><li>")
results in the following structure (new elements are in red).
<body>
/ \
<div> <ul>
/ \ \
<p> <p> <li>
Unlike the insertBeforeEnd method, new elements
become siblings of the specified element, not
children.
If either elem or htmlText
parameter is null, no changes are made to the
document.
For this to work correcty, the document must have an
HTMLEditorKit.Parser set. This will be the case
if the document was created from an HTMLEditorKit via the
createDefaultDocument method.
elem - the element the content is inserted afterhtmlText - the string to be parsed and inserted after elemIllegalStateException - if an HTMLEditorKit.Parser has not
been set on the documentBadLocationExceptionIOExceptionpublic Element getElement(String id)
Attribute.
If the element can't be found, null is returned.
Note that this method works on an Attribute,
not a character tag. In the following HTML snippet:
<a id="HelloThere"> the attribute is
'id' and the character tag is 'a'.
This is a convenience method for
getElement(RootElement, HTML.Attribute.id, id).
This is not thread-safe.id - the string representing the desired AttributeAttribute
or null if it can't be found,
or null if id is nullHTML.Attributepublic Element getElement(Element e, Object attribute, Object value)
e that contains the
attribute, attribute with value value, or
null if one isn't found. This is not thread-safe.e - the root element where the search beginsattribute - the desired Attributevalue - the values for the specified AttributeAttribute
and the specified value, or null
if it can't be foundHTML.Attributeprotected void fireChangedUpdate(DocumentEvent e)
fireChangedUpdate in class AbstractDocumente - the eventEventListenerListprotected void fireUndoableEditUpdate(UndoableEditEvent e)
fireUndoableEditUpdate in class AbstractDocumente - the eventEventListenerList Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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