osgi/core/src/main/java/org/apache/karaf/webconsole/osgi/core/manifest/ManifestUtil.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.karaf.webconsole.osgi.core.manifest;

import java.io.IOException;
import java.io.InputStream;
import java.util.jar.Attributes;
import java.util.jar.Manifest;

import org.apache.felix.utils.manifest.Clause;
import org.apache.felix.utils.manifest.Parser;
import org.osgi.framework.Bundle;

/**
 * Utility class to work with bundle manifests.
 */
public abstract class ManifestUtil {

    public static Clause[] getHeader(Bundle bundle, String header) throws IOException {
        return getHeader(bundle.getResource("META-INF/MANIFEST.MF").openStream(), header);
    }

    public static Clause[] getHeader(InputStream stream, String header) throws IOException {
        Manifest manifest = new Manifest(stream);
        Attributes mainAttributes = manifest.getMainAttributes();
        String value = mainAttributes.getValue(header);
        return Parser.parseHeader(value);
    }

}