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java.lang.Objectcom.icl.saxon.output.Emitter
com.nwalsh.saxon.CopyEmitter
com.nwalsh.saxon.CalloutEmitter
public class CalloutEmitter
Saxon extension to decorate a result tree fragment with callouts.
$Id: CalloutEmitter.java 5907 2006-04-27 08:26:47Z xmldoc $
Copyright (C) 2000 Norman Walsh.
This class provides the guts of a Saxon 6.* implementation of callouts for verbatim environments. (It is used by the Verbatim class.)
The general design is this: the stylesheets construct a result tree fragment for some verbatim environment. The Verbatim class initializes a CalloutEmitter with information about the callouts that should be applied to the verbatim environment in question. Then the result tree fragment is "replayed" through the CalloutEmitter; the CalloutEmitter builds a new result tree fragment from this event stream, decorated with callouts, and that is returned.
Change Log:
Initial release.
Verbatim
Field Summary | |
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protected int |
defaultColumn
The default column for callouts that specify only a line. |
protected Stack |
elementStack
A stack for the preserving information about open elements. |
protected boolean |
firstElement
Is the next element absolutely the first element in the fragment? |
protected boolean |
foStylesheet
Is the stylesheet currently running an FO stylesheet? |
protected static String |
foURI
The FO namespace name. |
protected Stack |
tempStack
A stack for holding information about temporarily closed elements. |
protected static String |
xhURI
The XHTML namespace name. |
Fields inherited from class com.nwalsh.saxon.CopyEmitter |
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namePool, rtf, rtfEmitter |
Fields inherited from class com.icl.saxon.output.Emitter |
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locator, outputProperties, outputStream, systemId, writer |
Fields inherited from interface javax.xml.transform.Result |
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PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING |
Constructor Summary | |
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CalloutEmitter(com.icl.saxon.Controller controller,
com.icl.saxon.om.NamePool namePool,
int defaultColumn,
boolean foStylesheet,
FormatCallout fCallout)
Constructor for the CalloutEmitter. |
Method Summary | |
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protected void |
addCallout(int coNum,
Node node,
int defaultColumn)
Add a callout to the global callout array |
void |
characters(char[] chars,
int start,
int len)
Process characters. |
void |
endElement(int nameCode)
Process end element events. |
protected void |
formatPad(int numBlanks)
Add blanks to the result tree fragment. |
void |
setupCallouts(NodeList areaspecNodeList)
Examine the areaspec and determine the number and position of callouts. |
protected boolean |
skipThisElement(int nameCode)
Protect the outer-most block wrapper. |
void |
startElement(int nameCode,
Attributes attributes,
int[] namespaces,
int nscount)
Process start element events. |
Methods inherited from class com.nwalsh.saxon.CopyEmitter |
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comment, endDocument, getResultTreeFragment, processingInstruction, setDocumentLocator, setEscaping, setNamePool, setUnparsedEntity, setWriter, startDocument |
Methods inherited from class com.icl.saxon.output.Emitter |
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getNamePool, getOutputProperties, getOutputStream, getSystemId, getWriter, makeEmitter, setOutputProperties, setOutputStream, setSystemId, usesWriter |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected Stack elementStack
protected Stack tempStack
protected boolean firstElement
protected static String foURI
protected static String xhURI
protected int defaultColumn
protected boolean foStylesheet
Constructor Detail |
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public CalloutEmitter(com.icl.saxon.Controller controller, com.icl.saxon.om.NamePool namePool, int defaultColumn, boolean foStylesheet, FormatCallout fCallout)
Constructor for the CalloutEmitter.
controller
- namePool
- The name pool to use for constructing elements and attributes.defaultColumn
- The default column for callouts.foStylesheet
- Is this an FO stylesheet?fCallout
- Method Detail |
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public void setupCallouts(NodeList areaspecNodeList)
Examine the areaspec and determine the number and position of callouts.
The areaspecNodeSet
is examined and a sorted list of the callouts is constructed.
This data structure is used to augment the result tree fragment with callout bullets.
areaspecNodeList
- The source document <areaspec> element.public void characters(char[] chars, int start, int len) throws TransformerException
characters
in class CopyEmitter
TransformerException
protected void formatPad(int numBlanks)
Add blanks to the result tree fragment.
This method adds numBlanks to the result tree fragment. It's used to pad lines when callouts occur after the last existing characater in a line.
numBlanks
- The number of blanks to add.protected void addCallout(int coNum, Node node, int defaultColumn)
Add a callout to the global callout array
This method examines a callout area and adds it to the global callout array if it can be interpreted.
Only the linecolumn and linerange units are supported. If no unit is specifed, linecolumn is assumed. If only a line is specified, the callout decoration appears in the defaultColumn.
coNum
- The callout number.node
- The area.defaultColumn
- The default column for callouts.public void endElement(int nameCode) throws TransformerException
endElement
in class CopyEmitter
TransformerException
public void startElement(int nameCode, Attributes attributes, int[] namespaces, int nscount) throws TransformerException
startElement
in class CopyEmitter
TransformerException
protected boolean skipThisElement(int nameCode)
Protect the outer-most block wrapper.
Open elements in the result tree fragment are closed and reopened around callouts (so that callouts don't appear inside links or other environments). But if the result tree fragment is a single block (a div or pre in HTML, an fo:block in FO), that outer-most block is treated specially.
This method returns true if the element in question is that outermost block.
nameCode
- The name code for the element
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