001/**
002 *
003 * Copyright 2014-2018 Florian Schmaus
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smack.initializer;
018
019import java.io.InputStream;
020import java.net.URI;
021import java.util.LinkedList;
022import java.util.List;
023import java.util.logging.Level;
024import java.util.logging.Logger;
025
026import org.jivesoftware.smack.SmackInitialization;
027import org.jivesoftware.smack.provider.ProviderFileLoader;
028import org.jivesoftware.smack.provider.ProviderManager;
029import org.jivesoftware.smack.util.FileUtils;
030
031/**
032 * Loads the provider file defined by the URL returned by {@link #getProvidersUri()} and the generic
033 * smack configuration file returned {@link #getConfigUri()}.
034 *
035 * @author Florian Schmaus
036 */
037public abstract class UrlInitializer implements SmackInitializer {
038    private static final Logger LOGGER = Logger.getLogger(UrlInitializer.class.getName());
039
040    @Override
041    public List<Exception> initialize() {
042        InputStream is;
043        final ClassLoader classLoader = this.getClass().getClassLoader();
044        final List<Exception> exceptions = new LinkedList<Exception>();
045        final String providerUriString = getProvidersUri();
046        if (providerUriString != null) {
047            try {
048                final URI providerUri = URI.create(providerUriString);
049                is = FileUtils.getStreamForUri(providerUri, classLoader);
050
051                LOGGER.log(Level.FINE, "Loading providers for providerUri [" + providerUri + "]");
052                ProviderFileLoader pfl = new ProviderFileLoader(is, classLoader);
053                ProviderManager.addLoader(pfl);
054                exceptions.addAll(pfl.getLoadingExceptions());
055            }
056            catch (Exception e) {
057                LOGGER.log(Level.SEVERE, "Error trying to load provider file " + providerUriString, e);
058                exceptions.add(e);
059            }
060        }
061        final String configUriString = getConfigUri();
062        if (configUriString != null) {
063            try {
064                final URI configUri = URI.create(configUriString);
065                is = FileUtils.getStreamForUri(configUri, classLoader);
066                SmackInitialization.processConfigFile(is, exceptions, classLoader);
067            }
068            catch (Exception e) {
069                exceptions.add(e);
070            }
071        }
072        return exceptions;
073    }
074
075    protected String getProvidersUri() {
076        return null;
077    }
078
079    protected String getConfigUri() {
080        return null;
081    }
082}