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/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.kernel.bundleinfo;

import static org.opencastproject.util.EqualsUtil.eq;
import static org.opencastproject.util.data.Option.option;

import org.opencastproject.util.data.Function;
import org.opencastproject.util.data.Function2;
import org.opencastproject.util.data.Option;

import org.osgi.framework.Bundle;

/** Functions on {@link BundleInfo}. */
public final class BundleInfos {
  public static final String MANIFEST_BUILD_NUMBER = "Build-Number";
  public static final String MANIFEST_DB_VERSION = "Mh-Db-Version";

  private BundleInfos() {
  }

  /** Check if version and build numbers are equal. */
  public static boolean versionEq(BundleInfo a, BundleInfo b) {
    return eq(a.getBundleVersion(), b.getBundleVersion()) && eq(a.getBuildNumber(), b.getBuildNumber());
  }

  /** {@link BundleInfos#versionEq(BundleInfo, BundleInfo)} as a function. */
  public static final Function2 versionEq = new Function2() {
    @Override
    public Boolean apply(BundleInfo a, BundleInfo b) {
      return versionEq(a, b);
    }
  };

  public static final Function getBundleVersion = new Function() {
    @Override
    public String apply(BundleInfo bundleInfo) {
      return bundleInfo.getBundleVersion();
    }
  };

  public static final Function> getBuildNumber = new Function>() {
    @Override
    public Option apply(BundleInfo bundleInfo) {
      return bundleInfo.getBuildNumber();
    }
  };

  /** Extract the build number of a bundle. */
  public static Option getBuildNumber(Bundle bundle) {
    return option(bundle.getHeaders().get(MANIFEST_BUILD_NUMBER));
  }
}