org.eclipse.gemini.blueprint.test.internal.util.jar.ManifestUtils.java Source code

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/******************************************************************************
 * Copyright (c) 2006, 2010 VMware Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution. 
 * The Eclipse Public License is available at 
 * http://www.eclipse.org/legal/epl-v10.html and the Apache License v2.0
 * is available at http://www.opensource.org/licenses/apache2.0.php.
 * You may elect to redistribute this code under either of these licenses. 
 * 
 * Contributors:
 *   VMware Inc.
 *****************************************************************************/

package org.eclipse.gemini.blueprint.test.internal.util.jar;

import java.util.LinkedHashSet;
import java.util.Set;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

import org.osgi.framework.Constants;
import org.springframework.core.io.Resource;
import org.springframework.util.StringUtils;

/**
 * Utility class for creating Manifest objects on various criterions.
 * 
 * @author Costin Leau
 * 
 */
public abstract class ManifestUtils {

    /**
     * Determine the Import-Package value based on the Export-Package entries in
     * the jars given as Resources.
     * @param resources
     * @return
     */
    public static String[] determineImportPackages(Resource[] resources) {
        Set collection = new LinkedHashSet();
        // for each resource
        for (int i = 0; i < resources.length; i++) {
            Resource resource = resources[i];
            Manifest man = JarUtils.getManifest(resource);
            if (man != null) {
                // read the manifest
                // get the Export-Package
                Attributes attrs = man.getMainAttributes();
                String exportedPackages = attrs.getValue(Constants.EXPORT_PACKAGE);
                // add it to the StringBuilder
                if (StringUtils.hasText(exportedPackages)) {
                    collection.addAll(StringUtils.commaDelimitedListToSet(exportedPackages));
                }
            }
        }
        // return the result as string
        String[] array = (String[]) collection.toArray(new String[collection.size()]);

        // clean whitespace just in case
        for (int i = 0; i < array.length; i++) {
            array[i] = StringUtils.trimWhitespace(array[i]);
        }
        return array;
    }
}