org.jdom2.output.support
Class AbstractFormattedWalker

java.lang.Object
  org.jdom2.output.support.AbstractFormattedWalker

All Implemented Interfaces:

Walker

Direct Known Subclasses:

WalkCompacting, WalkTrimming, WalkTrimmingFullWhite

public abstract class AbstractFormattedWalker
extends java.lang.Object
implements Walker

This Walker implementation walks a list of Content in a Formatted form of some sort.

The JDOM content can be loosely categorised in to 'Text-like' content (consisting of Text, CDATA, and EntityRef), and everything else. This distinction is significant for for this class and it's sub-classes.

There will be text manipulation, and some (but not necessarily all) Text-like content will be returned as text() instead of next().

The trick in this class is that it deals with the regular content, and delegates the Text-like content to the sub-classes.

Subclasses are tasked with analysing chunks of Text-like content in the analyzeMultiText(MultiText, int, int) method. The subclasses are responsible for adding the relevant text content to the suppliedMultiText instance in such a way as to result in the correct format.

The Subclass needs to concern itself with only the text portion because this abstract class will ensure the Text-like content is appropriately indented.

Author:

Rolf Lear

Nested Class Summary

protected class	AbstractFormattedWalker.MultiText Collect together the items that constitute formatted Text-like content.
protected static class	AbstractFormattedWalker.Trim Indicate how text content should be added

Constructor Summary

AbstractFormattedWalker(java.util.List<? extends Content> content, FormatStack fstack, boolean doescape)
Create a Walker that preserves all content in its raw state.

Method Summary

protected abstract void	analyzeMultiText(AbstractFormattedWalker.MultiText mtext, int offset, int len) Add the content at the specified indices to the provided MultiText.
protected Content	get(int index) Get the content at a position in the input content.
boolean	hasNext() Behaves similarly to to a regular Iterator
boolean	isAllText() If all the content in this walker is empty, or if whatever content is available is Text-like.
boolean	isAllWhiteSpace() If all the content is Text-like (Walker.isAllText() returns true), and additionally that any content is either Text or CDATA, and that the values of these Text/CDATA members are all XML Whitespace.
boolean	isCDATA() If the previous next() method returned null, then this will indicate whether the current text() value is CDATA or regular Text.
Content	next() Similar to an Iterator, but null return values need special treatment.
java.lang.String	text() If the previous call to next() returned null, then this will return the required text to be processed.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractFormattedWalker

public AbstractFormattedWalker(java.util.List<? extends Content> content,
                               FormatStack fstack,
                               boolean doescape)

Create a Walker that preserves all content in its raw state.

Parameters:

content - the content to walk.

fstack - the current FormatStack

doescape - Whether Text values should be escaped.

Method Detail

next

public final Content next()

Description copied from interface: Walker

Similar to an Iterator, but null return values need special treatment.

Specified by:

next in interface Walker

Returns:

the next content to be processed, perhaps null if the next content is re-formatted text of some sort (Text / CDATA).

analyzeMultiText

protected abstract void analyzeMultiText(AbstractFormattedWalker.MultiText mtext,
                                         int offset,
                                         int len)

Add the content at the specified indices to the provided MultiText.

Parameters:

mtext - the MultiText to append to.

offset - The first Text-like content to add to the MultiText

len - The number of Text-like content items to add.

get

protected final Content get(int index)

Get the content at a position in the input content. Useful for subclasses in their analyzeMultiText(MultiText, int, int) calls.

Parameters:

index - the index to get the content at.

Returns:

the content at the index.

isAllText

public final boolean isAllText()

Description copied from interface: Walker

If all the content in this walker is empty, or if whatever content is available is Text-like.

Text-like content is considered to be Text, CDATA, EntityRef, or any (potentially mixed) sequence of these types, but no other types.

Specified by:

isAllText in interface Walker

Returns:

true if there is no content, or all content is Text

hasNext

public final boolean hasNext()

Description copied from interface: Walker

Behaves similarly to to a regular Iterator

Specified by:

hasNext in interface Walker

Returns:

true if there is more content to be processed

text

public final java.lang.String text()

Description copied from interface: Walker

If the previous call to next() returned null, then this will return the required text to be processed. Check to see whether this text is CDATA by calling the isCDATA() method.

Specified by:

text in interface Walker

Returns:

The current text value (null if the previous invocation of next() returned a non-null value).

isCDATA

public final boolean isCDATA()

Description copied from interface: Walker

If the previous next() method returned null, then this will indicate whether the current text() value is CDATA or regular Text.

Specified by:

isCDATA in interface Walker

Returns:

true if the current text() is valid, and is CDATA.

isAllWhiteSpace

public final boolean isAllWhiteSpace()

Description copied from interface: Walker

If all the content is Text-like (Walker.isAllText() returns true), and additionally that any content is either Text or CDATA, and that the values of these Text/CDATA members are all XML Whitespace.

Specified by:

isAllWhiteSpace in interface Walker

Returns:

true