org.ops4j.pax.url.obr.internal.Connection.java Source code

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Here is the source code for org.ops4j.pax.url.obr.internal.Connection.java

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/*
 * Copyright 2008 Alin Dreghiciu.
 *
 * Licensed  under the  Apache License,  Version 2.0  (the "License");
 * you may not use  this file  except in  compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed  under the  License is distributed on an "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
 * implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.ops4j.pax.url.obr.internal;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.ops4j.lang.NullArgumentException;
import org.ops4j.net.URLUtils;
import org.ops4j.pax.swissbox.tracker.ReplaceableService;
import org.osgi.service.obr.RepositoryAdmin;
import org.osgi.service.obr.Resource;

/**
 * Url connection for obr protocol handler.
 *
 * @author Alin Dreghiciu
 * @since 0.2.0, February 01, 2008
 */
class Connection extends URLConnection {

    /**
     * Logger.
     */
    private static final Log LOG = LogFactory.getLog(Connection.class);

    /**
     * Parsed url.
     */
    private Parser m_parser;
    /**
     * Service configuration.
     */
    private final Configuration m_configuration;

    private final ReplaceableService<RepositoryAdmin> m_replaceableService;

    /**
     * Creates a new connection.
     *
     * @param url             the url; cannot be null.
     * @param configuration   service configuration; cannot be null
     * @param repositoryAdmin obr repository admin to use
     * @param filterValidator filter syntax validator
     *
     * @throws java.net.MalformedURLException in case of a malformed url
     * @throws NullArgumentException          if any of the arguments is null
     */
    public Connection(final URL url, final Configuration configuration,
            final ReplaceableService<RepositoryAdmin> replaceableService, final FilterValidator filterValidator)
            throws MalformedURLException {
        super(url);

        NullArgumentException.validateNotNull(url, "URL cannot be null");
        NullArgumentException.validateNotNull(configuration, "Service configuration");
        NullArgumentException.validateNotNull(replaceableService, "No Replaceable Service available");

        m_configuration = configuration;
        m_replaceableService = replaceableService;
        m_parser = new Parser(url.getPath(), filterValidator);
    }

    /**
     * Returns an input stream for the discovered bundle.
     *
     * @return the input stream for the discovered bundle
     */
    @Override
    public InputStream getInputStream() throws IOException {
        connect();
        LOG.debug("Discover resources for filter [" + m_parser.getFilter() + "]");

        m_replaceableService.start();
        RepositoryAdmin repositoryAdmin = m_replaceableService.getService();

        if (repositoryAdmin == null) {
            throw new IllegalStateException("No RepositoryAdmin Service available");
        }

        final Resource[] resources = repositoryAdmin.discoverResources(m_parser.getFilter());
        if (resources.length == 0) {
            throw new IOException("No resource found for provided filter [" + m_parser.getFilter() + "]");
        }
        if (LOG.isTraceEnabled()) {
            LOG.trace("Found resources:");
            for (Resource resource : resources) {
                final StringBuilder builder = new StringBuilder().append("id=").append(resource.getId())
                        .append(",sn=").append(resource.getSymbolicName()).append(",v=")
                        .append(resource.getVersion()).append(",url=").append(resource.getURL());
                LOG.trace("  " + builder.toString());
            }
        }
        return URLUtils.prepareInputStream(resources[0].getURL(), !m_configuration.getCertificateCheck());
    }

    /**
     * Does nothing.
     */
    @Override
    public void connect() {
        // do nothing
    }

}