com.sun.faces.config.manager.tasks.FindConfigResourceURIsTask Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jakarta.faces Show documentation
EE4J Compatible Implementation for Jakarta Faces API
The newest version!
/*
 * Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.faces.config.manager.tasks;

import static java.util.Collections.emptyList;

import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.concurrent.Callable;

import com.sun.faces.spi.ConfigurationResourceProvider;

import jakarta.servlet.ServletContext;

/**
 * 
 * This Callable will be used by getXMLDocuments
 * It represents one or more URIs to configuration resources that require processing.
 * 
 */
public class FindConfigResourceURIsTask implements Callable> {

    private final ConfigurationResourceProvider provider;
    private final ServletContext servletContext;

    // -------------------------------------------------------- Constructors

    /**
     * Constructs a new URITask instance.
     *
     * @param provider the ConfigurationResourceProvider from which zero or more URLs will be
     * returned
     * @param servletContext the ServletContext of the current application
     */
    public FindConfigResourceURIsTask(ConfigurationResourceProvider provider, ServletContext servletContext) {
        this.provider = provider;
        this.servletContext = servletContext;
    }

    // ----------------------------------------------- Methods from Callable

    /**
     * @return zero or more URL instances
     * @throws Exception if an Exception is thrown by the underlying ConfigurationResourceProvider
     */
    @SuppressWarnings("unchecked")
    @Override
    public Collection call() throws Exception {
        Collection untypedCollection = provider.getResources(servletContext);
        Iterator untypedCollectionIterator = untypedCollection.iterator();

        Collection result = emptyList();

        if (untypedCollectionIterator.hasNext()) {
            Object cur = untypedCollectionIterator.next();

            // Account for older versions of the provider that return Collection.
            if (cur instanceof URL) {
                result = new ArrayList<>(untypedCollection.size());
                result.add(new URI(((URL) cur).toExternalForm()));
                while (untypedCollectionIterator.hasNext()) {
                    cur = untypedCollectionIterator.next();
                    result.add(new URI(((URL) cur).toExternalForm()));
                }
            } else {
                result = untypedCollection;
            }
        }

        return result;
    }

}