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package com.sun.xml.txw2.output;

import com.sun.xml.txw2.TxwException;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;
import org.xml.sax.helpers.AttributesImpl;

import javax.xml.transform.sax.SAXResult;
import java.util.Stack;

/**
 * {@link XmlSerializer} for {@link SAXResult} and {@link ContentHandler}.
 *
 * @author [email protected]
 */
public class SaxSerializer implements XmlSerializer {

    private final ContentHandler writer;
    private final LexicalHandler lexical;

    public SaxSerializer(ContentHandler handler) {
        this(handler,null,true);
    }

    /**
     * Creates an {@link XmlSerializer} that writes SAX events.
     *
     * 

* Sepcifying a non-null {@link LexicalHandler} allows applications * to write comments and CDATA sections. */ public SaxSerializer(ContentHandler handler,LexicalHandler lex) { this(handler, lex, true); } public SaxSerializer(ContentHandler handler,LexicalHandler lex, boolean indenting) { if(!indenting) { writer = handler; lexical = lex; } else { IndentingXMLFilter indenter = new IndentingXMLFilter(handler, lex); writer = indenter; lexical = indenter; } } public SaxSerializer(SAXResult result) { this(result.getHandler(),result.getLexicalHandler()); } // XmlSerializer implementation public void startDocument() { try { writer.startDocument(); } catch (SAXException e) { throw new TxwException(e); } } // namespace prefix bindings // add in #writeXmlns and fired in #endStartTag private final Stack prefixBindings = new Stack(); public void writeXmlns(String prefix, String uri) { // defend against parsers that pass null in for "xmlns" prefix if (prefix == null) { prefix = ""; } if (prefix.equals("xml")) { return; } prefixBindings.add(uri); prefixBindings.add(prefix); } // element stack private final Stack elementBindings = new Stack(); public void beginStartTag(String uri, String localName, String prefix) { // save element bindings for #endTag elementBindings.add(getQName(prefix, localName)); elementBindings.add(localName); elementBindings.add(uri); } // attribute storage // attrs are buffered in #writeAttribute and sent to the content // handler in #endStartTag private final AttributesImpl attrs = new AttributesImpl(); public void writeAttribute(String uri, String localName, String prefix, StringBuilder value) { attrs.addAttribute(uri, localName, getQName(prefix, localName), "CDATA", value.toString()); } public void endStartTag(String uri, String localName, String prefix) { try { while (prefixBindings.size() != 0) { writer.startPrefixMapping(prefixBindings.pop(), // prefix prefixBindings.pop() // uri ); } writer.startElement(uri, localName, getQName(prefix, localName), attrs); attrs.clear(); } catch (SAXException e) { throw new TxwException(e); } } public void endTag() { try { writer.endElement(elementBindings.pop(), // uri elementBindings.pop(), // localName elementBindings.pop() // qname ); } catch (SAXException e) { throw new TxwException(e); } } public void text(StringBuilder text) { try { writer.characters(text.toString().toCharArray(), 0, text.length()); } catch (SAXException e) { throw new TxwException(e); } } public void cdata(StringBuilder text) { if(lexical==null) throw new UnsupportedOperationException("LexicalHandler is needed to write PCDATA"); try { lexical.startCDATA(); text(text); lexical.endCDATA(); } catch (SAXException e) { throw new TxwException(e); } } public void comment(StringBuilder comment) { try { if(lexical==null) throw new UnsupportedOperationException("LexicalHandler is needed to write comments"); else lexical.comment(comment.toString().toCharArray(), 0, comment.length() ); } catch (SAXException e) { throw new TxwException(e); } } public void endDocument() { try { writer.endDocument(); } catch (SAXException e) { throw new TxwException(e); } } public void flush() { // noop } // other methods private static String getQName(String prefix, String localName) { final String qName; if (prefix == null || prefix.length() == 0) qName = localName; else qName = prefix + ':' + localName; return qName; } }





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