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package com.sun.tools.xjc.runtime;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;

/**
 * This class implements the actual logic of {@link JAXBContext#newInstance}.
 *
 * 
 * This class works as a facade and all the actual work is delegated to
 * a JAXB provider that happens to be in the runtime (not necessarily the JAXB RI.)
 * This allows the generated code to be run with any JAXB provider.
 *
 * 

 * This code is only used when XJC generates interfaces/implementations.
 *
 * 

 * The trick to make this work is two ObjectFactory classes that we generate
 * in the interface/implementation mode.
 *
 * 

 * The public ObjectFactory follows the spec, and this is the one that's exposed
 * to users. The public ObjectFactory refers to interfaces, so they aren't
 * directly usable by a JAXB 2.0 implementation.
 *
 * 

 * The private one lives in the impl package, and this one is indistinguishable
 * from the ObjectFactory that we generate for the value class generation mode.
 * This private ObjectFactory refers to implementation classes, which are
 * also indistinguishable from value classes that JAXB generates.
 *
 * 

 * All in all, the private ObjectFactory plus implementation classes give
 * a JAXB provider an illusion that they are dealing with value classes
 * that happens to implement some interfaces.
 *
 * 
 * In this way, the JAXB RI can provide the portability even for the
 * interface/implementation generation mode.
 *
 * @since 2.0
 * @author Kohsuke Kawaguchi
 */
public class JAXBContextFactory {
    private static final String DOT_OBJECT_FACTORY = ".ObjectFactory";
    private static final String IMPL_DOT_OBJECT_FACTORY = ".impl.ObjectFactory";

    /**
     * The JAXB API will invoke this method via reflection
     */
    public static JAXBContext createContext( Class[] classes, Map properties ) throws JAXBException {
        Class[] r = new Class[classes.length];
        boolean modified = false;

        // find any reference to our 'public' ObjectFactory and
        // replace that to our 'private' ObjectFactory.
        for( int i=0; i classes = new ArrayList();
        StringTokenizer tokens = new StringTokenizer(contextPath,":");

        // each package should be pointing to a JAXB RI generated
        // content interface package.
        //
        // translate them into a list of private ObjectFactories.
        try {
            while(tokens.hasMoreTokens()) {
                String pkg = tokens.nextToken();
                classes.add(classLoader.loadClass(pkg+IMPL_DOT_OBJECT_FACTORY));
            }
        } catch (ClassNotFoundException e) {
            throw new JAXBException(e);
        }

        // delegate to the JAXB provider in the system
        return JAXBContext.newInstance(classes.toArray(new Class[classes.size()]),properties);
    }
}