/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * 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.argeo.slc.osgi.build;
  
  import java.net.URL;
  import java.util.Enumeration;
  import java.util.SortedMap;
  import java.util.StringTokenizer;
  import java.util.jar.JarInputStream;
  import java.util.jar.Manifest;
  
  import org.apache.commons.io.IOUtils;
  import org.argeo.slc.DefaultNameVersion;
  import org.argeo.slc.NameVersion;
  import org.argeo.slc.build.Distribution;
  import org.argeo.slc.core.build.VersionedResourceDistribution;
  import org.osgi.framework.Constants;
  import org.springframework.context.ResourceLoaderAware;
  import org.springframework.core.io.ResourceLoader;
  
  public class BundleModularDistribution extends AbstractOsgiModularDistribution
  		implements ResourceLoaderAware {
  	private ResourceLoader resourceLoader;
  
  	private String libDirectory = "/lib";
  
  	protected void fillDistributions(
  			SortedMap<NameVersion, Distribution> distributions)
  			throws Exception {
  		Enumeration<URL> urls = (Enumeration<URL>) getBundleContext()
  				.getBundle().findEntries(libDirectory, "*.jar", false);
  		while (urls.hasMoreElements()) {
  			URL url = urls.nextElement();
  			JarInputStream in = null;
  			try {
  				in = new JarInputStream(url.openStream());
  				Manifest mf = in.getManifest();
  				String name = mf.getMainAttributes().getValue(
  						Constants.BUNDLE_SYMBOLICNAME);
  				// Skip additional specs such as
  				// ; singleton:=true
  				if (name.indexOf(';') > -1) {
  					name = new StringTokenizer(name, " ;").nextToken();
  				}
  
  				String version = mf.getMainAttributes().getValue(
  						Constants.BUNDLE_VERSION);
  				DefaultNameVersion nameVersion = new DefaultNameVersion(name,
  						version);
  				distributions.put(nameVersion,
  						new VersionedResourceDistribution(name, version,
  								resourceLoader.getResource(url.toString())));
  			} finally {
  				IOUtils.closeQuietly(in);
  			}
  		}
  	}
  
  	public void setLibDirectory(String libDirectory) {
  		this.libDirectory = libDirectory;
  	}
  
  	public void setResourceLoader(ResourceLoader resourceLoader) {
  		this.resourceLoader = resourceLoader;
  	}
  
  	/*
  	 * @SuppressWarnings(value = { "unchecked" }) protected URL
  	 * findModule(String moduleName, String version) { Enumeration<URL> urls =
  	 * (Enumeration<URL>) bundleContext.getBundle() .findEntries(libDirectory,
  	 * moduleName + "*", false);
  	 * 
  	 * if (!urls.hasMoreElements()) throw new SlcException("Cannot find module "
  	 * + moduleName);
  	 * 
  	 * URL url = urls.nextElement();
  	 * 
  	 * // TODO: check version as well if (urls.hasMoreElements()) throw new
  	 * SlcException("More than one module with name " + moduleName); return url;
  	 * }
  	 */
  
  }