xmlrequestreaderadapter.java

电子地图服务器,搭建自己的地图服务

/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
 * This code is licensed under the GPL 2.0 license, availible at the root
 * application directory.
 */
package org.geoserver.ows.adapters;

import org.geoserver.ows.HttpServletRequestAware;
import org.vfny.geoserver.servlets.AbstractService;
import org.vfny.geoserver.util.requests.readers.XmlRequestReader;
import java.io.Reader;
import java.lang.reflect.Constructor;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.xml.namespace.QName;


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

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

    public XmlRequestReaderAdapter(String namespace, String local, AbstractService 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) throws Exception {
        //look for a constructor, may have to walk up teh class hierachy
        Class clazz = service.getClass();
        Constructor constructor = null;

        while (clazz != null) {
            try {
                constructor = delegateClass.getConstructor(new Class[] { clazz });

                break;
            } catch (NoSuchMethodException e) {
                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);
    }
}