private static void doFragment(ResourceImpl resource, Headers headers) {
    // Check if we are a fragment
    Clause[] clauses = Parser.parseHeader(headers.getHeader(Constants.FRAGMENT_HOST));
    if (clauses != null && clauses.length == 1) {
      // We are a fragment, create a requirement
      // to our host.
      RequirementImpl r = new RequirementImpl(Capability.BUNDLE);
      StringBuffer sb = new StringBuffer();
      sb.append("(&(symbolicname=");
      sb.append(clauses[0].getName());
      sb.append(")");
      appendVersion(
          sb,
          VersionRange.parseVersionRange(
              clauses[0].getAttribute(Constants.BUNDLE_VERSION_ATTRIBUTE)));
      sb.append(")");
      r.setFilter(sb.toString());
      r.addText("Required Host " + clauses[0].getName());
      r.setExtend(true);
      r.setOptional(false);
      r.setMultiple(false);
      resource.addRequire(r);

      // And insert a capability that we are available
      // as a fragment. ### Do we need that with extend?
      CapabilityImpl capability = new CapabilityImpl(Capability.FRAGMENT);
      capability.addProperty("host", clauses[0].getName());
      capability.addProperty("version", Property.VERSION, getVersion(clauses[0]));
      resource.addCapability(capability);
    }
  }
  private static void doImports(ResourceImpl resource, Headers headers) {
    Clause[] clauses = Parser.parseHeader(headers.getHeader(Constants.IMPORT_PACKAGE));
    for (int i = 0; clauses != null && i < clauses.length; i++) {
      RequirementImpl requirement = new RequirementImpl(Capability.PACKAGE);

      createImportFilter(requirement, Capability.PACKAGE, clauses[i]);
      requirement.addText("Import package " + clauses[i]);
      requirement.setOptional(
          Constants.RESOLUTION_OPTIONAL.equalsIgnoreCase(
              clauses[i].getDirective(Constants.RESOLUTION_DIRECTIVE)));
      resource.addRequire(requirement);
    }
  }
 private static void doExecutionEnvironment(ResourceImpl resource, Headers headers) {
   Clause[] clauses =
       Parser.parseHeader(headers.getHeader(Constants.BUNDLE_REQUIREDEXECUTIONENVIRONMENT));
   if (clauses != null && clauses.length > 0) {
     StringBuffer sb = new StringBuffer();
     sb.append("(|");
     for (int i = 0; i < clauses.length; i++) {
       sb.append("(");
       sb.append(Capability.EXECUTIONENVIRONMENT);
       sb.append("=");
       sb.append(clauses[i].getName());
       sb.append(")");
     }
     sb.append(")");
     RequirementImpl req = new RequirementImpl(Capability.EXECUTIONENVIRONMENT);
     req.setFilter(sb.toString());
     req.addText("Execution Environment " + sb.toString());
     resource.addRequire(req);
   }
 }
  private static void doImportExportServices(ResourceImpl resource, Headers headers) {
    Clause[] imports = Parser.parseHeader(headers.getHeader(Constants.IMPORT_SERVICE));
    for (int i = 0; imports != null && i < imports.length; i++) {
      RequirementImpl ri = new RequirementImpl(Capability.SERVICE);
      ri.setFilter(createServiceFilter(imports[i]));
      ri.addText("Import Service " + imports[i].getName());

      String avail = imports[i].getDirective("availability");
      String mult = imports[i].getDirective("multiple");
      ri.setOptional("optional".equalsIgnoreCase(avail));
      ri.setMultiple(!"false".equalsIgnoreCase(mult));
      resource.addRequire(ri);
    }

    Clause[] exports = Parser.parseHeader(headers.getHeader(Constants.EXPORT_SERVICE));
    for (int i = 0; exports != null && i < exports.length; i++) {
      CapabilityImpl cap = createServiceCapability(exports[i]);
      resource.addCapability(cap);
    }
  }
  private static void doRequires(ResourceImpl resource, Headers headers) {
    Clause[] clauses = Parser.parseHeader(headers.getHeader(Constants.REQUIRE_BUNDLE));
    for (int i = 0; clauses != null && i < clauses.length; i++) {
      RequirementImpl r = new RequirementImpl(Capability.BUNDLE);

      VersionRange v =
          VersionRange.parseVersionRange(
              clauses[i].getAttribute(Constants.BUNDLE_VERSION_ATTRIBUTE));

      StringBuffer sb = new StringBuffer();
      sb.append("(&(symbolicname=");
      sb.append(clauses[i].getName());
      sb.append(")");
      appendVersion(sb, v);
      sb.append(")");
      r.setFilter(sb.toString());

      r.addText("Require Bundle " + clauses[i].getName() + "; " + v);
      r.setOptional(
          Constants.RESOLUTION_OPTIONAL.equalsIgnoreCase(
              clauses[i].getDirective(Constants.RESOLUTION_DIRECTIVE)));
      resource.addRequire(r);
    }
  }