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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class AbstractWriter - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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javax.swing.text
Class AbstractWriter

java.lang.Object
  |
  +--javax.swing.text.AbstractWriter

Direct Known Subclasses:

HTMLWriter, MinimalHTMLWriter

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public abstract class AbstractWriter

extends Object

AbstractWriter is an abstract class that actually does the work of writing out the element tree including the attributes. In terms of how much is written out per line, the writer defaults to 100. But this value can be set by subclasses.

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Field Summary
protected static char	NEWLINE

 

Constructor Summary
protected	AbstractWriter(Writer w, Document doc)           Creates a new AbstractWriter.
protected	AbstractWriter(Writer w, Document doc, int pos, int len)           Creates a new AbstractWriter.
protected	AbstractWriter(Writer w, Element root)           Creates a new AbstractWriter.
protected	AbstractWriter(Writer w, Element root, int pos, int len)           Creates a new AbstractWriter.

 

Method Summary
protected  void	decrIndent()           Decrements the indent level.
protected  Document	getDocument()           Fetches the document.
protected  ElementIterator	getElementIterator()           Fetches the ElementIterator.
protected  String	getText(Element elem)           Returns the text associated with the element.
protected  void	incrIndent()           Increments the indent level.
protected  void	indent()           Does indentation.
protected  boolean	inRange(Element next)           This method determines whether the current element is in the range specified.
protected  void	setIndentSpace(int space)           Enables subclasses to specify how many spaces an indent maps to.
protected  void	setLineLength(int l)           Enables subclasses to set the number of characters they want written per line.
protected  void	text(Element elem)           Writes out text.
protected abstract  void	write()           This abstract method needs to be implemented by subclasses.
protected  void	write(char ch)           Writes out a character.
protected  void	write(String str)           Writes out a string.
protected  void	writeAttributes(AttributeSet attr)           Writes out the set of attributes as " =" pairs.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

NEWLINE

protected static final char NEWLINE

Constructor Detail

AbstractWriter

protected AbstractWriter(Writer w,
                         Document doc)

Creates a new AbstractWriter. Initializes the ElementIterator with the default root of the document.

Parameters:

a - Writer.

a - Document

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AbstractWriter

protected AbstractWriter(Writer w,
                         Document doc,
                         int pos,
                         int len)

Creates a new AbstractWriter. Initializes the ElementIterator with the element passed in.

Parameters:

a - Writer

an - Element

pos - The location in the document to fetch the content.

len - The amount to write out.

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AbstractWriter

protected AbstractWriter(Writer w,
                         Element root)

Creates a new AbstractWriter. Initializes the ElementIterator with the element passed in.

Parameters:

a - Writer

an - Element

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AbstractWriter

protected AbstractWriter(Writer w,
                         Element root,
                         int pos,
                         int len)

Creates a new AbstractWriter. Initializes the ElementIterator with the element passed in.

Parameters:

a - Writer

an - Element

pos - The location in the document to fetch the content.

len - The amount to write out.

Method Detail

getElementIterator

protected ElementIterator getElementIterator()

Fetches the ElementIterator.

Returns:

the ElementIterator.

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getDocument

protected Document getDocument()

Fetches the document.

Returns:

the Document.

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inRange

protected boolean inRange(Element next)

This method determines whether the current element is in the range specified. When no range is specified, the range is initialized to be the entire document. inRange() returns true if the range specified intersects with the element's range.

Parameters:

an - Element.

Returns:

boolean that indicates whether the element is in the range.

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write

protected abstract void write()
                       throws IOException,
                              BadLocationException

This abstract method needs to be implemented by subclasses. Its responsibility is to iterate over the elements and use the write() methods to generate output in the desired format.

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getText

protected String getText(Element elem)
                  throws BadLocationException

Returns the text associated with the element. The assumption here is that the element is a leaf element. Throws a BadLocationException when encountered.

Parameters:

an - Element.

Throws:

BadLocationException - if pos represents an invalid location within the document.

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text

protected void text(Element elem)
             throws BadLocationException,
                    IOException

Writes out text. If a range is specified when the constructor is invoked, then only the appropriate range of text is written out.

Parameters:

an - Element.

Throws:

IOException - on any I/O error

BadLocationException - if pos represents an invalid location within the document.

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setLineLength

protected void setLineLength(int l)

Enables subclasses to set the number of characters they want written per line. The default is 100.

Parameters:

the - maximum line length.

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setIndentSpace

protected void setIndentSpace(int space)

Enables subclasses to specify how many spaces an indent maps to. When indentation takes place, the indent level is multiplied by this mapping. The default is 2.

Parameters:

an - int representing the space to indent mapping.

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incrIndent

protected void incrIndent()

Increments the indent level.

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decrIndent

protected void decrIndent()

Decrements the indent level.

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indent

protected void indent()
               throws IOException

Does indentation. The number of spaces written out is indent level times the space to map mapping.

Throws:

IOException - on any I/O error

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write

protected void write(char ch)
              throws IOException

Writes out a character. If the character is a newline then it resets the current length to 0. If the current length equals the maximum line length, then a newline is outputed and the current length is reset to 0.

Parameters:

a - char.

Throws:

IOException - on any I/O error

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write

protected void write(String str)
              throws IOException

Writes out a string. If writing out the string on the current line results in the maximum line length being exceeded, it then attempts to write this line out on the next line. However if the length of the string itself exceeds the maximum line length, it then recursively calls this method on the substring from 0 to max line length, and then again from max line length+1 to the end of the string -- inserting new lines where necessary.

Parameters:

a - String.

Throws:

IOException - on any I/O error

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writeAttributes

protected void writeAttributes(AttributeSet attr)
                        throws IOException

Writes out the set of attributes as " =" pairs. It throws an IOException when encountered.

Parameters:

an - AttributeSet.

Throws:

IOException - on any I/O error

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