/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
 * (c) 2001 - 2013 OpenPlans
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package org.geoserver.ows.adapters;

import java.io.Reader;
import java.lang.reflect.Constructor;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.xml.namespace.QName;

import org.geoserver.config.ServiceInfo;
import org.geoserver.config.impl.GeoServerImpl;
import org.geoserver.ows.HttpServletRequestAware;
import org.vfny.geoserver.util.requests.readers.XmlRequestReader;


public class XmlRequestReaderAdapter extends org.geoserver.ows.XmlRequestReader
    implements HttpServletRequestAware {
    Class delegateClass;
    ServiceInfo service;
    HttpServletRequest httpRequest;

    public XmlRequestReaderAdapter(QName element, ServiceInfo service, Class delegate) {
        super(element);
        this.service = service;
        this.delegateClass = delegate;
    }

    public XmlRequestReaderAdapter(String namespace, String local, ServiceInfo service,
        Class delegate) {
        this(new QName(namespace, local), service, delegate);
    }

    public void setHttpRequest(HttpServletRequest request) {
        this.httpRequest = request;
    }

    public Object read(Object request, Reader reader, Map kvp) throws Exception {
        //look for a constructor, may have to walk up teh class hierachy
        Class clazz = GeoServerImpl.unwrap(service).getClass();
        Constructor constructor = null;

        while (clazz != null && constructor == null) {
            try {
                constructor = delegateClass.getConstructor(new Class[] { clazz });
            } catch (NoSuchMethodException e) {
                Class[] classes = clazz.getInterfaces();
                for (Class c : classes) {
                        try {
                                constructor = delegateClass.getConstructor(new Class[] { c });
                        } catch(NoSuchMethodException e2) {
                                // no harm done
                        }
                                }
                clazz = clazz.getSuperclass();
            }
        }

        if (constructor == null) {
            throw new IllegalStateException("No appropriate constructor");
        }

        XmlRequestReader delegate = (XmlRequestReader) constructor.newInstance(new Object[] { service });
        
        return delegate.read(reader, httpRequest);
    }
}