/*
 * $Id$
 *
 * Copyright (c) 1996, 2009, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package com.sun.javatest.httpd;

import java.util.Hashtable;
import java.io.PrintWriter;

import com.sun.javatest.util.I18NResourceBundle;

/**
 * Root level public registry for JT Harness classes which wish to publish pages
 * for the http server.  
 */

public class RootRegistry extends ProviderRegistry {
    private RootRegistry() {
	// to prevent instantiation
	httpHandle = new SpecialURLHandler();
	addHandler("/version", "Version information handler", httpHandle);
    }

    /**
     * The root registry is a Singleton.
     */
    public static RootRegistry getInstance() {
	if (myInstance == null)
	    myInstance = new RootRegistry();

	return myInstance;
    }

    public void addHandler(String url, String descrip, JThttpProvider obj) {
	if (!url.equals("/"))
	    super.addHandler(url, descrip, obj);
	else {
	    // special case for a normally invalid url
	    if (debug) {
		System.out.println("RPR-Adding Handler: " + descrip);
		System.out.println("   RPR-Adding URL: " + url);
		System.out.println("   RPR-Adding OBJ: " + obj);
	    }

	    String[] path = {url};
	    insertHandler(path, descrip, obj, false);
	}
    }

    /** 
     * Given a specific object, find an associated handler.
     * This only works if an associateObject() has been done for the specified
     * object.
     *
     * @param what The object to lookup.
     * @return The object's handler, or null if none if registered.
     */
    public static JThttpProvider getObjectHandler(Object what) {
	return (JThttpProvider)(obj2prov.get(what));
    }

    public static void associateObject(Object what, JThttpProvider prov) {
	if (what != null && prov != null)
	    obj2prov.put(what, prov);
    }

    public static void unassociateObject(Object what, JThttpProvider prov) {
	if (what != null && prov != null) {
	    Object found = obj2prov.get(what);
	    if (found == prov)
		obj2prov.remove(what);
	    else
		throw new IllegalArgumentException(
		    "RR-Unable to unassociateObject, providers do not match.");
	}
    }

    private static RootRegistry myInstance = new RootRegistry();
    private SpecialURLHandler httpHandle;

    /**
     * Maps an object reference to a provider.
     * Good for associating a first-class JT Harness object with a provider.
     * For example, map a TestResultTable instance to it's HTTP handler.
     */
    protected static Hashtable obj2prov = new Hashtable();
    private static I18NResourceBundle i18n = I18NResourceBundle.getBundleForClass(RootRegistry.class);

    static {
	String title = i18n.getString("root.name");
	myInstance.addHandler("/", title, new IndexHandler(myInstance.url2prov));
	myInstance.addHandler("/index.html", title, new IndexHandler(myInstance.url2prov));
    }

    private class SpecialURLHandler extends JThttpProvider {
	public void serviceRequest(httpURL url, PrintWriter out) {
	    url.resetIterator();
	    String target = url.getNextFile();

	    if (target.equals("version")) {
		printVersionInfo(out);
	    }

	    out.close();
	}

	private void printVersionInfo(PrintWriter out) {
	    println(out, PageGenerator.getSWName() + " " + PageGenerator.getSWVersion());
	    print(out, i18n.getString("root.built.txt"));
	    println(out, PageGenerator.getSWBuildDate());
	}
    }
}

