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package com.jclark.xsl.sax;
import org.xml.sax.*;
import java.io.OutputStream;
import java.io.IOException;
public class Indenter implements OutputDocumentHandler, CommentHandler, RawCharactersHandler {
private DocumentHandler documentHandler = null;
private CommentHandler commentHandler = null;
private RawCharactersHandler rawCharactersHandler;
private char[] newline = new char[]{'\n'};
static private final byte IN_PCDATA_CHUNK = 0;
static private final byte JUST_HAD_START_TAG = 1;
static private final byte OTHER = 2;
private byte state = IN_PCDATA_CHUNK;
public Indenter(DocumentHandler handler,
RawCharactersHandler rawCharactersHandler) {
this.documentHandler = handler;
if (handler instanceof CommentHandler)
this.commentHandler =(CommentHandler)handler;
else
this.commentHandler = null;
this.rawCharactersHandler = rawCharactersHandler;
}
public DocumentHandler init(Destination dest, AttributeList atts)
throws IOException, SAXException {
if (documentHandler instanceof OutputDocumentHandler)
documentHandler = ((OutputDocumentHandler)documentHandler).init(dest, atts);
return this;
}
public void setDocumentLocator(Locator locator) {
documentHandler.setDocumentLocator(locator);
}
public void startDocument()
throws SAXException {
documentHandler.startDocument();
}
public void endDocument()
throws SAXException {
maybeNewline();
documentHandler.endDocument();
}
public void startElement(String name, AttributeList atts)
throws SAXException {
maybeNewline();
state = JUST_HAD_START_TAG;
documentHandler.startElement(name, atts);
}
public void endElement(String name)
throws SAXException {
if (state == JUST_HAD_START_TAG)
state = OTHER;
else
maybeNewline();
documentHandler.endElement(name);
}
public void characters(char ch[], int start, int length)
throws SAXException {
if (length > 0) {
documentHandler.characters(ch, start, length);
state = IN_PCDATA_CHUNK;
}
}
public void ignorableWhitespace(char ch[], int start, int length)
throws SAXException {
if (length > 0) {
documentHandler.ignorableWhitespace(ch, start, length);
state = IN_PCDATA_CHUNK;
}
}
public void rawCharacters(String chars) throws SAXException {
if (chars.length() > 0) {
rawCharactersHandler.rawCharacters(chars);
state = IN_PCDATA_CHUNK;
}
}
private final void maybeNewline() throws SAXException {
if (state != IN_PCDATA_CHUNK) {
documentHandler.characters(newline, 0, 1);
newline[0] = '\n';
}
state = OTHER;
}
public void processingInstruction(String target, String data)
throws SAXException {
maybeNewline();
documentHandler.processingInstruction(target, data);
}
public void comment(String contents)
throws SAXException {
if (commentHandler != null) {
maybeNewline();
commentHandler.comment(contents);
}
}
}
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