/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
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 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package org.glassfish.faces.integration;

import java.net.URL;
import java.net.URLClassLoader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;

import org.glassfish.api.web.TldProvider;
import org.jvnet.hk2.annotations.Scoped;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.component.PostConstruct;
import org.jvnet.hk2.component.Singleton;

import com.sun.enterprise.util.net.JarURIPattern;
import com.sun.enterprise.module.Module;
import com.sun.enterprise.module.ModulesRegistry;


/**
 * Implementation of TldProvider for JSF.
 * @author Shing Wai Chan
 * @author Sahoo
 */

@Service(name="jsfTld")
@Scoped(Singleton.class)
public class GlassFishTldProvider implements TldProvider, PostConstruct {
    @Inject
    ModulesRegistry registry;

    private Map<URI, List<String>> tldMap = new HashMap<URI, List<String>>();
 
    /**
     * Get a Map with key URL and value as a list of tld entries.
     */
    public Map<URI, List<String>> getTldMap() {
        return (Map<URI, List<String>>)((HashMap)tldMap).clone();
    }

    public void postConstruct() {

        Class jsfImplClass = null;
        try {
            jsfImplClass = getClass().getClassLoader().loadClass("com.sun.faces.spi.InjectionProvider");
        } catch (ClassNotFoundException ignored) {
        }

        URI[] uris = null;
        Module m = null;
        if (jsfImplClass != null) {
            m = registry.find(jsfImplClass);
        }
        if (m!=null) {
            uris = m.getModuleDefinition().getLocations();
        } else {
            ClassLoader classLoader = getClass().getClassLoader();
            if (classLoader instanceof URLClassLoader) {
                URL[] urls = ((URLClassLoader)classLoader).getURLs();
                if (urls != null && urls.length > 0) {
                    uris = new URI[urls.length];
                    for (int i = 0; i < urls.length; i++) {
                        try {
                            uris[i] = urls[i].toURI();
                        } catch(URISyntaxException e) {
                            // TODO(Sahoo): Use logger
                            System.out.println("Ignoring " + uris[i] + " because of " + e);
                        }
                    }
                }
            } else {
                // TODO(Sahoo): Use logger
                System.out.println("ClassLoader [" + classLoader +
                        "] is not of type URLClassLoader");
            }
        }

        if (uris != null && uris.length > 0) {
            Pattern pattern = Pattern.compile("META-INF/.*\\.tld");
            for (URI uri : uris) {
                List entries =  JarURIPattern.getJarEntries(uri, pattern);
                if (entries != null && entries.size() > 0) {
                    tldMap.put(uri, entries);
                }
            }
        }
    }
}