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.
protected static final char NEWLINE
How the text packages models newlines.
getLineSeparator(), Constant Field Valuesprotected AbstractWriter(Writer w,
Document doc) Creates a new AbstractWriter. Initializes the ElementIterator with the default root of the document.
w - a Writer.doc - a Documentprotected AbstractWriter(Writer w,
Document doc,
int pos,
int len) Creates a new AbstractWriter. Initializes the ElementIterator with the element passed in.
w - a Writerdoc - an Elementpos - The location in the document to fetch the content.len - The amount to write out.protected AbstractWriter(Writer w,
Element root) Creates a new AbstractWriter. Initializes the ElementIterator with the element passed in.
w - a Writerroot - an Elementprotected AbstractWriter(Writer w,
Element root,
int pos,
int len) Creates a new AbstractWriter. Initializes the ElementIterator with the element passed in.
w - a Writerroot - an Elementpos - The location in the document to fetch the content.len - The amount to write out.public int getStartOffset()
Returns the first offset to be output.
public int getEndOffset()
Returns the last offset to be output.
protected ElementIterator getElementIterator()
Fetches the ElementIterator.
protected Writer getWriter()
Returns the Writer that is used to output the content.
protected Document getDocument()
Fetches the document.
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.
next - an Element.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.
IOExceptionBadLocationExceptionprotected 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.
elem - an Element
String
BadLocationException - if pos represents an invalid location within the documentprotected 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.
elem - an Element.IOException - on any I/O errorBadLocationException - if pos represents an invalid location within the document.protected void setLineLength(int l)
Enables subclasses to set the number of characters they want written per line. The default is 100.
l - the maximum line length.protected int getLineLength()
Returns the maximum line length.
protected void setCurrentLineLength(int length)
Sets the current line length.
protected int getCurrentLineLength()
Returns the current line length.
protected boolean isLineEmpty()
Returns true if the current line should be considered empty. This is true when getCurrentLineLength == 0 || indent has been invoked on an empty line.
protected void setCanWrapLines(boolean newValue)
Sets whether or not lines can be wrapped. This can be toggled during the writing of lines. For example, outputting HTML might set this to false when outputting a quoted string.
protected boolean getCanWrapLines()
Returns whether or not the lines can be wrapped. If this is false no lineSeparator's will be output.
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.
space - an int representing the space to indent mapping.protected int getIndentSpace()
Returns the amount of space to indent.
public void setLineSeparator(String value)
Sets the String used to represent newlines. This is initialized in the constructor from either the Document, or the System property line.separator.
public String getLineSeparator()
Returns the string used to represent newlines.
protected void incrIndent()
Increments the indent level. If indenting would cause getIndentSpace() *getIndentLevel() to be > than getLineLength() this will not cause an indent.
protected void decrIndent()
Decrements the indent level.
protected int getIndentLevel()
Returns the current indentation level. That is, the number of times incrIndent has been invoked minus the number of times decrIndent has been invoked.
protected void indent()
throws IOException Does indentation. The number of spaces written out is indent level times the space to map mapping. If the current line is empty, this will not make it so that the current line is still considered empty.
IOException - on any I/O errorprotected void write(char ch)
throws IOException Writes out a character. This is implemented to invoke the write method that takes a char[].
ch - a char.IOException - on any I/O errorprotected void write(String content)
throws IOException Writes out a string. This is implemented to invoke the write method that takes a char[].
content - a String.IOException - on any I/O errorprotected void writeLineSeparator()
throws IOException Writes the line separator. This invokes output directly as well as setting the lineLength to 0.
IOExceptionprotected void write(char[] chars,
int startIndex,
int length)
throws IOException All write methods call into this one. If getCanWrapLines() returns false, this will call output with each sequence of chars that doesn't contain a NEWLINE, followed by a call to writeLineSeparator. On the other hand, if getCanWrapLines() returns true, this will split the string, as necessary, so getLineLength is honored. The only exception is if the current string contains no whitespace, and won't fit in which case the line length will exceed getLineLength.
IOExceptionprotected void writeAttributes(AttributeSet attr)
throws IOException Writes out the set of attributes as " <name>=<value>" pairs. It throws an IOException when encountered.
attr - an AttributeSet.IOException - on any I/O errorprotected void output(char[] content,
int start,
int length)
throws IOException The last stop in writing out content. All the write methods eventually make it to this method, which invokes write on the Writer.
This method also updates the line length based on length. If this is invoked to output a newline, the current line length will need to be reset as will no longer be valid. If it is up to the caller to do this. Use writeLineSeparator to write out a newline, which will property update the current line length.
IOException
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