source: patches/NetKernel/trunk/src/modules/ext-xquery-2.4.4/org/ten60/ura/xslt2/XML2TinyTree.java @ 2029

package org.ten60.ura.xslt2;

import org.ten60.netkernel.xml.representation.*;
import org.ten60.netkernel.xml.util.XMLUtils;
import org.ten60.netkernel.xml.xda.*;
import org.ten60.netkernel.xml.util.NKFCatalogEntityResolver;

import org.ten60.netkernel.layer1.meta.*;
import org.ten60.netkernel.layer1.nkf.*;
import org.ten60.netkernel.layer1.nkf.impl.*;

import com.ten60.netkernel.urii.*;
import com.ten60.netkernel.urii.representation.ITransrepresentor;
import com.ten60.netkernel.urii.aspect.*;
import com.ten60.netkernel.util.NetKernelException;

import org.apache.xml.serializer.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.sax.*;
import javax.xml.transform.stream.*;

import org.xml.sax.*;
import org.xml.sax.helpers.*;
import java.io.*;
import java.util.*;
import org.w3c.dom.*;

import net.sf.saxon.*;
import net.sf.saxon.om.*;
import net.sf.saxon.tinytree.*;
import net.sf.saxon.trans.*;
import net.sf.saxon.xpath.*;

/**
 * Creates a TinyTree Aspect from any XML
 * @author maw
 */
public class XML2TinyTree extends NKFTransreptorImpl
{
        public boolean supports(IURRepresentation aFrom, Class aTo)
        {       return ( aTo.isAssignableFrom(TinyTreeAspect.class) );
        }
        
        public void transrepresent(INKFConvenienceHelper aContext) throws NetKernelException
        {       try
                {       Source aSource=null;
                        IURRepresentation aResource = aContext.source(INKFRequestReadOnly.URI_SYSTEM);
                        SAXParserFactory spf=SAXParserFactory.newInstance();
                        if(aResource.hasAspect(IAspectReadableBinaryStream.class))
                        {       IAspectReadableBinaryStream rbs = (IAspectReadableBinaryStream)aResource.getAspect(IAspectReadableBinaryStream.class);                          
                                XMLReader reader= spf.newSAXParser().getXMLReader();
                                reader.setEntityResolver(new NKFCatalogEntityResolver(aContext));
                                InputSource is= new InputSource(rbs.getInputStream());
                                is.setSystemId(aContext.getThisRequest().getURI());
                                aSource= new SAXSource(reader, is);
                        }
                        else if(aResource.hasAspect(IAspectBinaryStream.class))
                        {       ByteArrayOutputStream baos=new ByteArrayOutputStream(2048);
                                IAspectBinaryStream bs=(IAspectBinaryStream)aResource.getAspect(IAspectBinaryStream.class);
                                bs.write(baos);
                                XMLReader reader= spf.newSAXParser().getXMLReader();
                                reader.setEntityResolver(new NKFCatalogEntityResolver(aContext));
                                InputSource is= new InputSource(new ByteArrayInputStream(baos.toByteArray()));
                                is.setSystemId(aContext.getThisRequest().getURI());
                                aSource= new SAXSource(reader, is);
                        }
                        if(aSource==null)
                        {       IAspectReadableBinaryStream rbs = (IAspectReadableBinaryStream)aContext.sourceAspect(INKFRequestReadOnly.URI_SYSTEM, IAspectReadableBinaryStream.class);
                                XMLReader reader= spf.newSAXParser().getXMLReader();
                                reader.setEntityResolver(new NKFCatalogEntityResolver(aContext));
                                InputSource is= new InputSource(rbs.getInputStream());
                                is.setSystemId(aContext.getThisRequest().getURI());
                                aSource= new SAXSource(reader, is);
                        }

                        XPathEvaluator eval = new XPathEvaluator(XMLToXSLTransformer.getSharedSaxonConfiguration());
                        NodeInfo       tree = eval.setSource(aSource);

                        IURAspect    aspect = new TinyTreeAspect(tree);
                        
                        aContext.createResponseFrom(aspect).setCreationCost(32);
                } catch (Exception e)
                {       NetKernelException nke = new NetKernelException("Unhandled Exception in XML2TinyTree");
                        nke.addCause(e);
                        throw nke;
                }
        }
}