archive/releng.builder/tools/apitools/org.eclipse.wtp.releng.tools.component.core/src/org/eclipse/wtp/releng/tools/component/dependency/PluginDependencyScanner.java

/*******************************************************************************
 * Copyright (c) 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.wtp.releng.tools.component.dependency;

import java.util.Dictionary;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
import org.eclipse.core.runtime.IBundleGroup;
import org.eclipse.core.runtime.IBundleGroupProvider;
import org.eclipse.core.runtime.Platform;
import org.osgi.framework.Bundle;
import org.osgi.framework.Constants;

public class PluginDependencyScanner
{
  public Map execute()
  {
    Map plugins = new HashMap();
    IBundleGroupProvider[] providers = Platform.getBundleGroupProviders();
    for (int i = 0; i < providers.length; i++)
    {
      IBundleGroup[] groups = providers[i].getBundleGroups();
      for (int j = 0; j < groups.length; j++)
      {
        Bundle[] bundles = groups[j].getBundles();
        for (int k = 0; k < bundles.length; k++)
        {
          String id = bundles[k].getSymbolicName();
          Plugin plugin = getPlugin(plugins, id);
          Dictionary headers = bundles[k].getHeaders();
          String requiredBundles = (String)headers.get(Constants.REQUIRE_BUNDLE);
          if (requiredBundles != null)
          {
            StringTokenizer st = new StringTokenizer(requiredBundles, ",");
            while (st.hasMoreTokens())
            {
              String token = st.nextToken();
              int semicolon = token.indexOf(';');
              if (semicolon != -1)
                token = token.substring(0, semicolon);
              Plugin require = getPlugin(plugins, token);
              plugin.addRequire(require);
              require.addDependent(plugin);
            }
          }
        }
      }
    }
    return plugins;
  }

  private Plugin getPlugin(Map plugins, String id)
  {
    if (plugins.containsKey(id))
      return (Plugin)plugins.get(id);
    else
    {
      Plugin plugin = new Plugin();
      plugin.setId(id);
      plugins.put(id, plugin);
      return plugin;
    }
  }
}