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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. 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_1_1.html
 * or packager/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * 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
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * 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
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.faces.config.configprovider;

import java.net.URISyntaxException;
import java.net.URL;
import java.util.Collection;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Set;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletContext;
import javax.faces.FacesException;

import com.sun.faces.facelets.util.Classpath;
import com.sun.faces.util.Util;
import com.sun.faces.spi.ConfigurationResourceProvider;
import java.net.URI;

/**
 *
 */
public class MetaInfFaceletTaglibraryConfigProvider implements
      ConfigurationResourceProvider {

    private static final String SUFFIX = ".taglib.xml";
    private static final String WEB_INF_CLASSES =
          "/WEB-INF/classes/META-INF";

    /**
     * Array of taglib.xml files included with Facelets 1.1.x.  If they are
     * on the classpath, we don't want to process them.
     */
    private static final String[] FACELET_CONFIG_FILES = {
        "META-INF/jsf-core.taglib.xml",
        "META-INF/jsf-html.taglib.xml",
        "META-INF/jsf-ui.taglib.xml",
        "META-INF/jstl-core.taglib.xml",
        "META-INF/jstl-fn.taglib.xml"
    };


    // -------------------------------------------- Methods from ConfigProcessor


    public Collection getResources(ServletContext context) {

        try {
            URL[] urls = Classpath.search(Util.getCurrentLoader(this),
                                          "META-INF/",
                                          SUFFIX);
            // perform some 'correctness' checking.  If the user has
            // removed the FaceletViewHandler from their configuration,
            // but has left the jsf-facelets.jar in the classpath, we
            // need to ignore the default configuration resouces from
            // that JAR.
            List urlsList = pruneURLs(urls);

            // special case for finding taglib files in WEB-INF/classes/META-INF
            Set paths = context.getResourcePaths(WEB_INF_CLASSES);
            if (paths != null) {
                for (Object path : paths) {
                    String p = path.toString();
                    if (p.endsWith(".taglib.xml")) {
                        try {
                            urlsList.add(new URI(context.getResource(p).toExternalForm()));
                        } catch (URISyntaxException ex) {
                            throw new FacesException(ex);
                        }
                    }
                }
            }
            return urlsList;
        } catch (IOException ioe) {
            throw new FacesException("Error searching classpath from facelet-taglib documents", ioe);
        }

    }


    // --------------------------------------------------------- Private Methods


    private List pruneURLs(URL[] urls) {

        List ret = null;
        if (urls != null && urls.length > 0) {
            for (URL url : urls) {
                String u = url.toString();
                boolean found = false;
                for (String excludeName : FACELET_CONFIG_FILES) {
                    if (u.contains(excludeName)) {
                        found = true;
                        break;
                    }
                }
                if (!found) {
                    if (ret == null) {
                        ret = new ArrayList();
                    }
                    try {
                        String urlString = url.toExternalForm();
                        urlString = urlString.replaceAll(" ", "%20");
                        ret.add(new URI(urlString));
                    } catch (URISyntaxException ex) {
                        throw new FacesException(ex);
                    }
                }
            }
        }

        if (ret == null) {
            ret = Collections.emptyList();
        }
        return ret;

    }


}




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