Beispiel #1
1
 /*
  * public HashMap getLeafElements() { HashMap map = new HashMap(); Object[]
  * elts = dataElements.values().toArray(); for (int j=0; j<elts.length; j++)
  * { PDMDataElement data = (PDMDataElement) elts[j];
  * map.put(data.getID(),data); } Object[] ops =
  * operations.values().toArray(); for (int i=0; i<ops.length; i++){
  * PDMOperation op = (PDMOperation) ops[i]; if
  * (!(op.getInputElements().isEmpty())){ HashMap outs =
  * op.getOutputElements(); Object[] outArray = outs.values().toArray(); for
  * (int j=0; j<outArray.length; j++) { PDMDataElement d = (PDMDataElement)
  * outArray[j]; map.remove(d.getID()); } } } return map; }
  */
 public HashMap getLeafElements() {
   HashMap result = new HashMap();
   HashSet leafOps = getLeafOperations();
   if (!(leafOps.isEmpty())) {
     Iterator it = leafOps.iterator();
     while (it.hasNext()) {
       PDMOperation op = (PDMOperation) it.next();
       PDMDataElement data = op.getOutputElement();
       result.put(data.getID(), data);
     }
   } else {
     Object[] elts = dataElements.values().toArray();
     for (int j = 0; j < elts.length; j++) {
       PDMDataElement data = (PDMDataElement) elts[j];
       result.put(data.getID(), data);
     }
     Object[] ops = operations.values().toArray();
     for (int i = 0; i < ops.length; i++) {
       PDMOperation op = (PDMOperation) ops[i];
       HashMap outs = op.getOutputElements();
       Object[] outArray = outs.values().toArray();
       for (int j = 0; j < outArray.length; j++) {
         PDMDataElement d = (PDMDataElement) outArray[j];
         result.remove(d.getID());
       }
     }
   }
   return result;
 }
Beispiel #2
0
  public PDMState checkIfStateExists(
      PDMStateSpace statespace, HashSet data, HashSet exec, HashSet failed) {
    PDMState result = null;
    boolean bool = false;
    HashSet states = statespace.getStates();
    Iterator it = states.iterator();
    while (it.hasNext() && !bool) {
      PDMState state2 = (PDMState) it.next();
      boolean one = false;
      boolean two = false;
      boolean three = false;
      HashSet data2 = state2.dataElements;
      HashSet exec2 = state2.executedOperations;
      HashSet failed2 = state2.failedOperations;
      one = hashSetContainsSameDataElements(data, data2);
      two = hashSetContainsSameOperations(exec, exec2);
      three = hashSetContainsSameOperations(failed, failed2);

      if (one && two && three) {
        bool = true;
        result = state2;
      }
    }
    return result;
  }
Beispiel #3
0
  /**
   * Get the outputable nodes of the circuit
   *
   * @return an hashset of the outputable nodes of the circuit
   */
  public HashSet<Outputable> getOutputables() {
    HashSet<Outputable> outputs = new HashSet<Outputable>();

    for (iterNodes = getNodesIterator(); iterNodes.hasNext(); ) {
      Node n = iterNodes.next();

      if (n.getCategoryID() == Node.OUTPUT) outputs.add((Outputable) n);
    }

    return outputs;
  }
Beispiel #4
0
  /**
   * Get the inputable nodes of the circuit
   *
   * @return an hashset of the inputable nodes of the circuit
   */
  public HashSet<Inputable> getInputables() {
    HashSet<Inputable> inputs = new HashSet<Inputable>();

    for (iterNodes = getNodesIterator(); iterNodes.hasNext(); ) {
      Node n = iterNodes.next();

      if (n.getCategoryID() == Node.INPUT) inputs.add((Inputable) n);
    }

    return inputs;
  }
Beispiel #5
0
 public HashSet getLeafOperations() {
   HashSet result = new HashSet();
   Object[] ops = operations.values().toArray();
   for (int i = 0; i < ops.length; i++) {
     PDMOperation op = (PDMOperation) ops[i];
     if ((op.getInputElements().isEmpty())) {
       result.add(op);
     }
   }
   return result;
 }
Beispiel #6
0
 /**
  * Returns a HashSet with the operations that have data element 'data' as output element.
  *
  * @param data PDMDataElement
  * @return HashSet
  */
 public HashSet getOperationsWithOutputElement(PDMDataElement data) {
   HashSet opso = new HashSet();
   Object[] ops = operations.values().toArray();
   for (int i = 0; i < ops.length; i++) {
     PDMOperation op = (PDMOperation) ops[i];
     HashMap outputs = op.getOutputElements();
     if (outputs.containsValue(data)) {
       opso.add(op);
     }
   }
   return opso;
 }
Beispiel #7
0
  public static PetriNet convert(ConfigurableEPC baseEPC) {
    HashMap<EPCFunction, Transition> functionActivityMapping;
    HashMap<EPCConnector, Place> xorconnectorChoiceMapping;

    // HV: Initialize the mappings.
    functionActivityMapping = new HashMap<EPCFunction, Transition>();
    xorconnectorChoiceMapping = new HashMap<EPCConnector, Place>();

    // Check to use the weights if necessary
    // HV: Add both mappings. On completion, these will be filledd.
    PetriNet petrinet =
        EPCToPetriNetConverter.convert(
            baseEPC, new HashMap(), functionActivityMapping, xorconnectorChoiceMapping);

    HashSet visible = new HashSet();

    // HV: The next block is taken care of by the functionActivityMapping
    // below.
    /*
     * Iterator it = petrinet.getTransitions().iterator(); while
     * (it.hasNext()) { Transition t = (Transition) it.next(); if (t.object
     * instanceof EPCFunction) { // if (t.getLogEvent() != null) { // Add
     * transitions with LogEvent (i.e. referring to functions)
     * visible.add(t); } }
     */

    // HV: Prevent the places mapped onto from being reduced.
    visible.addAll(functionActivityMapping.values());
    visible.addAll(xorconnectorChoiceMapping.values());
    Message.add(visible.toString(), Message.DEBUG);

    Iterator it = petrinet.getPlaces().iterator();
    while (it.hasNext()) {
      Place p = (Place) it.next();
      if (p.inDegree() * p.outDegree() == 0) {
        // Add Initial and final places to visible, i.e. places that
        // refer to in and output events
        visible.add(p);
      }
    }

    // Reduce the PetriNet with Murata rules, while keeping the visible ones
    PetriNetReduction pnred = new PetriNetReduction();
    pnred.setNonReducableNodes(visible);

    HashMap pnMap = new HashMap(); // Used to map pre-reduction nodes to
    // post-reduction nodes.
    PetriNet reduced = pnred.reduce(petrinet, pnMap);

    if (reduced != petrinet) {
      // Update both mappings from pre-reduction nodes to post-reduction
      // nodes.
      HashMap<EPCFunction, Transition> newFunctionActivityMapping =
          new HashMap<EPCFunction, Transition>();
      for (EPCFunction function : functionActivityMapping.keySet()) {
        Transition transition = (Transition) functionActivityMapping.get(function);
        if (pnMap.keySet().contains(transition)) {
          newFunctionActivityMapping.put(function, (Transition) pnMap.get(transition));
        }
      }
      functionActivityMapping = newFunctionActivityMapping;
      HashMap<EPCConnector, Place> newXorconnectorChoiceMapping =
          new HashMap<EPCConnector, Place>();
      for (EPCConnector connector : xorconnectorChoiceMapping.keySet()) {
        Place place = (Place) xorconnectorChoiceMapping.get(connector);
        if (pnMap.keySet().contains(place)) {
          newXorconnectorChoiceMapping.put(connector, (Place) pnMap.get(place));
        }
      }
      xorconnectorChoiceMapping = newXorconnectorChoiceMapping;
    }
    reduced.makeClusters();

    // filter the \nunknown:normal
    ArrayList<Transition> alTrans = reduced.getVisibleTasks();
    for (int i = 0; i < alTrans.size(); i++) {
      Transition t = alTrans.get(i);
      String id = t.getIdentifier();
      int idx = id.indexOf("\\nunknown:normal");
      if (idx > 0) {
        id = id.substring(0, idx);
      }
      // �˴������ֵ��ѯ�滻���е�label
      String mappedId = htDict.get(id);
      if (mappedId != null) {
        t.setIdentifier(mappedId);
      } else {
        t.setIdentifier(id);
      }
    }

    return reduced;
  }
  @Override
  public HashSet<ScoredAnnotation> solveSa2W(String text) throws AnnotationException {
    HashSet<ScoredAnnotation> res;
    try {
      res = new HashSet<ScoredAnnotation>();
      lastTime = Calendar.getInstance().getTimeInMillis();

      URL wikiApi = new URL(url);
      String parameters =
          "references=true&repeatMode=all&minProbability=0.0&source="
              + URLEncoder.encode(text, "UTF-8");
      HttpURLConnection slConnection = (HttpURLConnection) wikiApi.openConnection();
      slConnection.setRequestProperty("accept", "text/xml");
      slConnection.setDoOutput(true);
      slConnection.setDoInput(true);
      slConnection.setRequestMethod("POST");
      slConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
      slConnection.setRequestProperty("charset", "utf-8");
      slConnection.setRequestProperty(
          "Content-Length", "" + Integer.toString(parameters.getBytes().length));
      slConnection.setUseCaches(false);

      DataOutputStream wr = new DataOutputStream(slConnection.getOutputStream());
      wr.writeBytes(parameters);
      wr.flush();
      wr.close();
      DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
      DocumentBuilder builder = factory.newDocumentBuilder();
      Document doc = builder.parse(slConnection.getInputStream());

      /*			URL wikiApi = new URL(url+"?references=true&repeatMode=all&minProbability=0.0&source="+URLEncoder.encode(text, "UTF-8"));
      			URLConnection wikiConnection = wikiApi.openConnection();
      			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
      			DocumentBuilder builder = factory.newDocumentBuilder();
      			Document doc = builder.parse(wikiConnection.getInputStream());
      */

      lastTime = Calendar.getInstance().getTimeInMillis() - lastTime;

      XPathFactory xPathfactory = XPathFactory.newInstance();
      XPath xpath = xPathfactory.newXPath();
      XPathExpression idExpr = xpath.compile("//detectedTopic/@id");
      XPathExpression weightExpr = xpath.compile("//detectedTopic/@weight");
      XPathExpression referenceExpr = xpath.compile("//detectedTopic/references");

      NodeList ids = (NodeList) idExpr.evaluate(doc, XPathConstants.NODESET);
      NodeList weights = (NodeList) weightExpr.evaluate(doc, XPathConstants.NODESET);
      NodeList references = (NodeList) referenceExpr.evaluate(doc, XPathConstants.NODESET);

      for (int i = 0; i < weights.getLength(); i++) {
        if (weights.item(i).getNodeType() != Node.TEXT_NODE) {
          int id = Integer.parseInt(ids.item(i).getNodeValue());
          float weight = Float.parseFloat(weights.item(i).getNodeValue());
          //					System.out.println("ID="+ids.item(i).getNodeValue()+" weight="+weight);
          XPathExpression startExpr =
              xpath.compile("//detectedTopic[@id=" + id + "]/references/reference/@start");
          XPathExpression endExpr =
              xpath.compile("//detectedTopic[@id=" + id + "]/references/reference/@end");
          NodeList starts =
              (NodeList) startExpr.evaluate(references.item(i), XPathConstants.NODESET);
          NodeList ends = (NodeList) endExpr.evaluate(references.item(i), XPathConstants.NODESET);
          for (int j = 0; j < starts.getLength(); j++) {
            int start = Integer.parseInt(starts.item(j).getNodeValue());
            int end = Integer.parseInt(ends.item(j).getNodeValue());
            int len = end - start;
            res.add(new ScoredAnnotation(start, len, id, weight));
          }
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
      throw new AnnotationException(
          "An error occurred while querying Wikipedia Miner API. Message: " + e.getMessage());
    }
    return res;
  }
Beispiel #9
0
  /**
   * Export PDM model to Declare process model.
   *
   * @param bw Writer
   * @throws IOException If writing fails
   */
  public void writePDMToDeclare(Writer bw) throws IOException {
    // write the preamble of the XML file
    bw.write("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n");
    bw.write("<model>\n");
    bw.write("<assignment language=\"ConDec\" name=\"" + name + "\">\n");

    // write the activity definitions, i.e. each operation in the PDM is an
    // activity definition in Declare
    bw.write("<activitydefinitions>\n");
    // start with an initial activity that puts the values for the leaf
    // elements of the PDM
    bw.write("<activity id=\"Initial\" name=\"Initial\">\n");
    bw.write("<authorization/>\n");
    bw.write("<datamodel>\n");
    // all leaf elements
    HashMap leafs = getLeafElements();
    Object[] leafElts = leafs.values().toArray();
    for (int i = 0; i < leafElts.length; i++) {
      PDMDataElement data = (PDMDataElement) leafElts[i];
      data.writePDMToDeclare(bw, "output");
    }
    bw.write("</datamodel>\n");
    bw.write("<attributes/>\n");
    bw.write("</activity>\n");

    // first remove input operations from the set of operations and then
    // write all real operations
    HashMap realOps = (HashMap) operations.clone();
    HashSet inputOps = getLeafOperations();
    Iterator it7 = inputOps.iterator();
    while (it7.hasNext()) {
      PDMOperation op = (PDMOperation) it7.next();
      realOps.remove(op.getID());
    }
    Iterator it4 = realOps.values().iterator();
    while (it4.hasNext()) {
      PDMOperation operation = (PDMOperation) it4.next();
      operation.writePDMToDeclare(bw);
    }
    bw.write("\n");
    // write all input operations (i.e. producing input data elements)
    Iterator it8 = inputOps.iterator();
    while (it8.hasNext()) {
      PDMOperation op = (PDMOperation) it8.next();
      op.writePDMToDeclare(bw);
    }

    bw.write("</activitydefinitions>\n");

    // write the constraint definition, for now we do not have any
    // constraints in the PDM that are translated to Declare
    bw.write("<constraintdefinitions>\n");
    bw.write("</constraintdefinitions>\n");

    // write all dataelements
    bw.write("<data>\n");
    Iterator it5 = dataElements.values().iterator();
    while (it5.hasNext()) {
      PDMDataElement dataElement = (PDMDataElement) it5.next();
      dataElement.writePDMToDeclare(bw);
    }
    bw.write("</data>\n");

    // write the organizational information
    bw.write("<team/>\n");

    // TODO: improve graphical positioning of activities. Now they are
    // presented in one long line.
    // write the graphical positioning information of the Declare model,
    // first the initial operation, then the real operations and then the
    // input operations.
    bw.write("<graphical>\n");
    bw.write("<cells>\n");
    Iterator it6 = realOps.values().iterator();
    Double pos = 10.0;
    while (it6.hasNext()) {
      PDMOperation operation = (PDMOperation) it6.next();
      bw.write(
          "<cell activitydefinition=\""
              + operation.getOperationNR()
              + "\" height=\"40.0\" width=\"80.0\" x=\""
              + pos
              + "\" y=\"90.0\" />\n");
      pos = pos + 85.0;
    }
    Iterator it9 = inputOps.iterator();
    pos = 10.0;
    while (it9.hasNext()) {
      PDMOperation operation = (PDMOperation) it9.next();
      bw.write(
          "<cell activitydefinition=\""
              + operation.getOperationNR()
              + "\" height=\"40.0\" width=\"80.0\" x=\""
              + pos
              + "\" y=\"180.0\" />\n");
      pos = pos + 85.0;
    }

    bw.write("</cells>\n");

    // write the connectors
    bw.write("<connectors/>\n");
    // close the XML file in the right way
    bw.write("</graphical>\n");
    bw.write("</assignment>\n");
    bw.write("</model>\n");
  }
Beispiel #10
0
 public boolean hashSetContainsSameOperations(HashSet set1, HashSet set2) {
   boolean result = false;
   HashSet s1 = (HashSet) set1.clone();
   HashSet s2 = (HashSet) set2.clone();
   // first part, are all elements of s1 also in s2?
   boolean one = false;
   Iterator it = set1.iterator();
   while (it.hasNext()) {
     PDMOperation d = (PDMOperation) it.next();
     if (s2.contains(d)) {
       s1.remove(d);
     }
   }
   if (s1.isEmpty()) {
     one = true;
   }
   // second part, are all elements of s21 also in s1?
   boolean two = false;
   HashSet s3 = (HashSet) set1.clone();
   HashSet s4 = (HashSet) set2.clone();
   Iterator it2 = set2.iterator();
   while (it2.hasNext()) {
     PDMOperation d = (PDMOperation) it2.next();
     if (s3.contains(d)) {
       s4.remove(d);
     }
   }
   if (s4.isEmpty()) {
     two = true;
   }
   // administrative stuff
   s1.clear();
   s2.clear();
   s3.clear();
   s4.clear();
   result = one && two;
   return result;
 }
Beispiel #11
0
  public HashSet calculateNextStates(
      PDMState state,
      PDMStateSpace statespace,
      boolean root,
      boolean failure,
      int numStates,
      int breadth) {
    HashSet result = new HashSet();
    HashSet data = state.dataElements;
    HashSet exec1 = state.executedOperations;
    HashSet failed = state.failedOperations;

    HashSet execOps = calculateExecutableOperations(data, exec1, failed, root);
    Iterator it = execOps.iterator();
    int b = 0;
    int bLimit = 0;
    if (!failure) {
      bLimit = breadth;
    } else {
      bLimit = breadth / 2;
    }
    // for each executable operation a new state is created
    while (it.hasNext() && i < numStates && b < bLimit) {
      if (!failure) {
        PDMOperation op = (PDMOperation) it.next();
        PDMDataElement d = op.getOutputElement();
        // First, add the state with the operation 'op' succesfully
        // executed
        HashSet ins2 = (HashSet) data.clone(); // NB: is it necessary to
        // clear this clone
        // again?
        ins2.add(d);
        HashSet exec2 = (HashSet) exec1.clone();
        exec2.add(op);
        PDMState s = checkIfStateExists(statespace, ins2, exec2, failed);
        // Check whether the new state already exists
        // If so, then another link to this state is made
        if (!(s == null)) {
          PDMState st = s;
          PDMStateEdge edge = new PDMStateEdge(state, st, op.getID(), 1.0);
          statespace.addEdge(edge);
        }
        // If not, a new state is created and linked to the current
        // state
        else {
          String name = "state" + i;
          // int num = checkStatusOfState(statespace, )
          PDMState st = new PDMState(statespace, name, ins2, exec2, failed);
          statespace.addState(st);
          result.add(st);
          PDMStateEdge edge = new PDMStateEdge(state, st, op.getID(), 1.0);
          statespace.addEdge(edge);
          i++;
          b++;
        }
      }

      // Then, if failure of operations is considered, add the state with
      // the failed operations 'op'.
      if (failure) {
        PDMOperation op = (PDMOperation) it.next();
        PDMDataElement d = op.getOutputElement();
        // First, add the state with the operation 'op' succesfully
        // executed
        HashSet ins2 = (HashSet) data.clone(); // NB: is it necessary to
        // clear this clone
        // again?
        ins2.add(d);
        HashSet exec2 = (HashSet) exec1.clone();
        exec2.add(op);
        PDMState s = checkIfStateExists(statespace, ins2, exec2, failed);
        // Check whether the new state already exists
        // If so, then another link to this state is made
        if (!(s == null)) {
          PDMState st = s;
          double prob = 1.0 - (op.getFailureProbability());
          PDMStateEdge edge = new PDMStateEdge(state, st, op.getID(), prob);
          statespace.addEdge(edge);
        }
        // If not, a new state is created and linked to the current
        // state
        else {
          String name = "state" + i;
          // int num = checkStatusOfState(statespace, )
          PDMState st = new PDMState(statespace, name, ins2, exec2, failed);
          statespace.addState(st);
          result.add(st);
          double prob = 1.0 - (op.getFailureProbability());
          PDMStateEdge edge = new PDMStateEdge(state, st, op.getID(), prob);
          statespace.addEdge(edge);
          i++;
          b++;
        }
        HashSet failed2 = (HashSet) failed.clone();
        failed2.add(op);
        PDMState s2 = checkIfStateExists(statespace, data, exec1, failed2);
        if (!(s2 == null)) {
          PDMState st = s2;
          PDMStateEdge edge = new PDMStateEdge(state, st, op.getID(), op.getFailureProbability());
          statespace.addEdge(edge);
        }
        // If not, a new state is created and linked to the current
        // state
        else {
          String name = "state" + i;
          PDMState st = new PDMState(statespace, name, data, exec1, failed2);
          statespace.addState(st);
          result.add(st);
          PDMStateEdge edge = new PDMStateEdge(state, st, op.getID(), op.getFailureProbability());
          statespace.addEdge(edge);
          i++;
          b++;
        }
        // failed2.clear();
      }
    }
    return result;
  }
Beispiel #12
0
  public PDMStateSpace calculateSimpleStateSpace(
      boolean root, boolean failure, boolean input, boolean colored, int numStates, int breadth) {
    PDMStateSpace result = new PDMStateSpace(this, colored);
    HashSet states = new HashSet();
    int j = (operations.size() + 1);

    if (!input) {
      HashSet empty = new HashSet();
      PDMState st = new PDMState(result, "state" + i, empty, empty, empty);
      result.addState(st);
      states.add(st);
      i++;
    } else {
      // Start with the complete set of input data elements available
      HashSet empty = new HashSet();
      String name = new String("state" + i);
      HashSet ins = new HashSet(); // this hashSet contains the input
      // elements to the process (input
      // elements of PDM)
      HashSet execOps = new HashSet();
      // Fill the hashSet with the leaf elements
      HashMap leafs = getLeafElements();
      Object[] leafElts = leafs.values().toArray();
      for (int i = 0; i < leafElts.length; i++) {
        PDMDataElement d = (PDMDataElement) leafElts[i];
        ins.add(d);
      }
      HashSet leafOps = getLeafOperations();
      Iterator it = leafOps.iterator();
      while (it.hasNext()) {
        PDMOperation op = (PDMOperation) it.next();
        execOps.add(op);
      }

      PDMState start = new PDMState(result, name, ins, execOps, empty); // start
      // state
      // of
      // the
      // statespace
      result.addState(start);
      i++;
      states.add(start);
    }
    while (!states.isEmpty()) {
      HashSet states2 = (HashSet) states.clone();
      Iterator it = states2.iterator();
      while (it.hasNext()) {
        PDMState state = (PDMState) it.next();
        HashSet nextStates = calculateNextStates(state, result, root, failure, numStates, breadth);
        Iterator it2 = nextStates.iterator();
        // Add the new states to iterator
        while (it2.hasNext()) {
          PDMState st = (PDMState) it2.next();
          states.add(st);
        }
        states.remove(state);
      }
    }
    i = 0;
    j = 0;
    Message.add("<PDMMDPStateSpace>", Message.TEST);
    Message.add("<NumberOfStates = " + result.getNumberOfStates() + " >", Message.TEST);
    Message.add("</PDMMDPStateSpace>", Message.TEST);
    return result;
  }
Beispiel #13
0
  public HashSet calculateExecutableOperations(
      HashSet dataElts, HashSet executed, HashSet failed, boolean root) {
    HashSet result = new HashSet();
    HashSet enabledOperations = new HashSet();

    if (root) {
      // Calculate the enabled operations (i.e. those operation of which
      // all input elements are in the set of available elements)
      Object[] ops = operations.values().toArray();
      for (int i = 0; i < ops.length; i++) {
        PDMOperation op = (PDMOperation) ops[i];
        HashMap inputs = op.getInputElements();
        Object[] ins = inputs.values().toArray();
        boolean enabled = true;
        int k = 0;
        while (enabled && k < ins.length) {
          PDMDataElement d = (PDMDataElement) ins[k];
          if (!(dataElts.contains(d))) {
            enabled = false;
          }
          k++;
        }
        if (enabled) {
          enabledOperations.add(op);
          // System.out.println("Enabled operation: "+ op.getID());
        }
      }
    } else if (!(dataElts.contains(this.getRootElement()))) {
      // Calculate the enabled operations (i.e. those operation of which
      // all input elements are in the set of available elements)
      Object[] ops = operations.values().toArray();
      for (int i = 0; i < ops.length; i++) {
        PDMOperation op = (PDMOperation) ops[i];
        HashMap inputs = op.getInputElements();
        Object[] ins = inputs.values().toArray();
        boolean enabled = true;
        int k = 0;
        while (enabled && k < ins.length) {
          PDMDataElement d = (PDMDataElement) ins[k];
          if (!(dataElts.contains(d))) {
            enabled = false;
          }
          k++;
        }
        if (enabled) {
          enabledOperations.add(op);
        }
      }
    }
    // remove already executed operations
    Iterator exIt = executed.iterator();
    while (exIt.hasNext()) {
      PDMOperation op = (PDMOperation) exIt.next();
      enabledOperations.remove(op);
    }
    // remove already failed operations
    Iterator fIt = failed.iterator();
    while (fIt.hasNext()) {
      PDMOperation op = (PDMOperation) fIt.next();
      enabledOperations.remove(op);
    }
    result = enabledOperations;
    return result;
  }