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package com.sun.enterprise.config.serverbeans.validation;
import java.io.FilterReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.ContentHandler;
import org.xml.sax.DTDHandler;
import org.xml.sax.EntityResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.XMLFilter;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLFilterImpl;
import java.io.InputStreamReader;
import com.sun.org.apache.xml.internal.serializer.ToXMLStream;
import java.io.StringReader;
import java.io.BufferedWriter;
/**
This class provides the mechanism to resolve variables present in
some given {@link InputSource}.
*/
// This class works like a standard XMLFilter, except that it parses
// the input source twice. On the first pass through it constructs a
// frame set which holds all the variable definitions. On the second
// pass it uses those definitions to resolve all variable references.
// All that this class does is to wrap up the underlying classes that
// provide that functionality and coordinate their activities.
// The kind of bugs that will be present in this class will be those
// that are to do with XML handling and coordination, not variable
// dereferencing.
// I dont think that this really should be a filter - its been
// implemented as if its an XMLReader, and that's how its being used.
public class VariableResolver extends XMLFilterImpl
{
private final FrameHolderBuilder frameHolderBuilder = new FrameHolderBuilder();
private final VariableExpander ve = new VariableExpander();
VariableResolver() throws SAXException{
super.setParent(getXMLReader());
}
/*
* Parse the input source, using the given input source. Note
* that the input source is used twice - this is probably an
* error, in general. The solution is to store the first set of
* events and then replay them.
*/
public void parse(InputSource is) throws IOException, SAXException {
final InputSource is2 = copyInputSource(is);
super.setContentHandler(frameHolderBuilder);
super.parse(is2);
is2.getCharacterStream().reset();
ve.setFramer(new Framer(frameHolderBuilder.getFrameHolder()));
ve.setParent(getParent());
ve.parse(is2);
}
private InputSource copyInputSource(InputSource is) throws IOException, SAXException {
final StringWriter out = new StringWriter();
final ToXMLStream xml = new ToXMLStream();
xml.setWriter(out);
final XMLReader r = getXMLReader();
r.setContentHandler(xml);
if (super.getEntityResolver() != null){
r.setEntityResolver(super.getEntityResolver());
}
r.parse(is);
final InputSource result= new InputSource(new StringReader(out.toString()){ public void close(){} });
result.setPublicId(is.getPublicId());
result.setSystemId(is.getSystemId());
return result;
}
private XMLReader getXMLReader() throws SAXException {
try{
final XMLReader xr = SAXParserFactory.newInstance().newSAXParser().getXMLReader();
xr.setFeature("http://xml.org/sax/features/namespaces", true);
xr.setFeature("http://xml.org/sax/features/namespace-prefixes", false);
return xr;
}
catch (ParserConfigurationException e){
throw new SAXException(e);
}
}
public void setContentHandler(ContentHandler contentHandler) {
ve.setContentHandler(contentHandler);
}
}
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