package examples;

import ch.ethz.mxquery.contextConfig.CompilerOptions;
import ch.ethz.mxquery.contextConfig.Context;
import ch.ethz.mxquery.contextConfig.XQDynamicContext;
import ch.ethz.mxquery.datamodel.MXQueryDateTime;
import ch.ethz.mxquery.datamodel.QName;
import ch.ethz.mxquery.exceptions.MXQueryException;
import ch.ethz.mxquery.exceptions.QueryLocation;
import ch.ethz.mxquery.model.XDMIterator;
import ch.ethz.mxquery.query.PreparedStatement;
import ch.ethz.mxquery.query.XQCompiler;
import ch.ethz.mxquery.query.impl.CompilerImpl;
import ch.ethz.mxquery.util.StringReader;
import ch.ethz.mxquery.xdmio.XDMAtomicItemFactory;
import ch.ethz.mxquery.xdmio.XDMInputFactory;
import ch.ethz.mxquery.xdmio.XDMSerializer;

// set boundary space policy
//set external variables
//set context item
// set current time 
public class ContextExample {

    public static void main(String[] arg) throws Exception {
	String query = "declare variable $ext external;"
		+ "\n<result>\n\t<external>\n\t\t{$ext}\n\t</external>"
		+ "\n\t<context>\n\t\t{.}\n\t</context>\n\t<time>"
		+ "\n\t\t{fn:current-dateTime()}\n\t</time>\n</result>";
	Context ctx = new Context();
	CompilerOptions co = new CompilerOptions();
	XQCompiler comp = new CompilerImpl();
	PreparedStatement statement;
	XDMSerializer ser = new XDMSerializer();
	// Static context setting
	// Keep boundary space (default is no)
	ctx.setBoundarySpaceHandling(true);

	try {
	    statement = comp.compile(ctx, query, co);

	    // Default store
	    XDMIterator it;
	    String xml = "<data attr='123'><child/>characters</data>";
	    String context = "context123";
	    XDMIterator inp = XDMInputFactory.createXMLInput(ctx,
		    new StringReader(xml), false, Context.NO_VALIDATION,
		    QueryLocation.OUTSIDE_QUERY_LOC);
	    XDMIterator cItem = XDMAtomicItemFactory.createString(context);
	    statement.addExternalResource(new QName("ext"), inp);
	    statement.setContextItem(cItem);
	    XQDynamicContext dynCtx = statement.getContext();
	    it = statement.evaluate();
	    dynCtx.setCurrentTime(new MXQueryDateTime(
		    "2000-01-01T00:00:00-00:00"));
	    System.out.println(ser.eventsToXML(it));
	    statement.close();
	    ctx.getStores().freeRessources();
	} catch (MXQueryException err) {
	    MXQueryException.printErrorPosition(query, err.getLocation());
	    System.err.println("Error:");
	    throw err;
	}

    }

}