Examples of org.apache.commons.scxml.model.Transition

org.apache.commons.scxml.model.Transition
The class in this SCXML object model that corresponds to the <transition> SCXML element. Transition rules are triggered by "events" and conditionalized via "guard-conditions".

        if (!c.isEmpty()) {
            if (ini == null) {
                logAndThrowModelError(ERR_STATE_NO_INIT,
                    new Object[] {getStateName(s)});
            }
            Transition initialTransition = ini.getTransition();
            updateTransition(initialTransition, targets);
            initialStates = initialTransition.getTargets();
            // we have to allow for an indirect descendant initial (targets)
            //check that initialState is a descendant of s
            if (initialStates.size() == 0) {
                logAndThrowModelError(ERR_STATE_BAD_INIT,
                    new Object[] {getStateName(s)});
            } else {
                for (int i = 0; i < initialStates.size(); i++) {
                    TransitionTarget initialState = (TransitionTarget)
                        initialStates.get(i);
                    if (!SCXMLHelper.isDescendant(initialState, s)) {
                        logAndThrowModelError(ERR_STATE_BAD_INIT,
                            new Object[] {getStateName(s)});
                    }
                }
            }
        }
        List histories = s.getHistory();
        Iterator histIter = histories.iterator();
        while (histIter.hasNext()) {
            if (s.isSimple()) {
                logAndThrowModelError(ERR_HISTORY_SIMPLE_STATE,
                    new Object[] {getStateName(s)});
            }
            History h = (History) histIter.next();
            Transition historyTransition = h.getTransition();
            if (historyTransition == null) {
                // try to assign initial as default
                if (initialStates != null && initialStates.size() > 0) {
                    for (int i = 0; i < initialStates.size(); i++) {
                        if (initialStates.get(i) instanceof History) {
                            logAndThrowModelError(ERR_HISTORY_BAD_DEFAULT,
                                new Object[] {h.getId(), getStateName(s)});
                        }
                    }
                    historyTransition = new Transition();
                    historyTransition.getTargets().addAll(initialStates);
                    h.setTransition(historyTransition);
                } else {
                    logAndThrowModelError(ERR_HISTORY_NO_DEFAULT,
                        new Object[] {h.getId(), getStateName(s)});
                }
            }
            updateTransition(historyTransition, targets);
            List historyStates = historyTransition.getTargets();
            if (historyStates.size() == 0) {
                logAndThrowModelError(ERR_STATE_NO_HIST,
                    new Object[] {getStateName(s)});
            }
            for (int i = 0; i < historyStates.size(); i++) {
                TransitionTarget historyState = (TransitionTarget)
                    historyStates.get(i);
                if (!h.isDeep()) {
                    if (!c.containsValue(historyState)) {
                        logAndThrowModelError(ERR_STATE_BAD_SHALLOW_HIST,
                            new Object[] {getStateName(s)});
                    }
                } else {
                    if (!SCXMLHelper.isDescendant(historyState, s)) {
                        logAndThrowModelError(ERR_STATE_BAD_DEEP_HIST,
                            new Object[] {getStateName(s)});
                    }
                }
            }
        }
        List t = s.getTransitionsList();
        for (int i = 0; i < t.size(); i++) {
            Transition trn = (Transition) t.get(i);
            updateTransition(trn, targets);
        }
        Parallel p = s.getParallel(); //TODO: Remove in v1.0
        Invoke inv = s.getInvoke();
        if ((inv != null && p != null)

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        // Add <exit> custom action rule in Commons SCXML namespace
        scxmlRules.setNamespaceURI(NAMESPACE_COMMONS_SCXML);
        scxmlRules.add(xp + XPF_EXT, new Rule() {
            public void end(final String namespace, final String name) {
                Transition t = (Transition) getDigester().peek(1);
                State exitState = new State();
                exitState.setFinal(true);
                t.getTargets().add(exitState);
            }
        });
        scxmlRules.setNamespaceURI(NAMESPACE_SCXML);


        scxmlRules.add(xp, new SetNextRule(setNextMethod));

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            }
            State s = (State) digester.peek();
            if (fragment == null) {
                // All targets pulled in since its not a src fragment
                Initial ini = new Initial();
                Transition t = new Transition();
                t.setNext(externalSCXML.getInitialstate());
                ini.setTransition(t);
                s.setInitial(ini);
                Map children = externalSCXML.getChildren();
                Iterator childIter = children.values().iterator();
                while (childIter.hasNext()) {

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        scxmlRules.add(xp, new SetCurrentNamespacesRule());
        scxmlRules.add(xp + XPF_TAR, new SetPropertiesRule());
        addActionRules(xp, scxmlRules, pr, customActions);
        scxmlRules.add(xp + XPF_EXT, new Rule() {
            public void end(final String namespace, final String name) {
                Transition t = (Transition) getDigester().peek(1);
                State exitState = new State();
                exitState.setFinal(true);
                t.getTargets().add(exitState);
            }
        });
        scxmlRules.add(xp, new SetNextRule(setNextMethod));
    }

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            }
            State s = (State) digester.peek();
            if (fragment == null) {
                // All targets pulled in since its not a src fragment
                Initial ini = new Initial();
                Transition t = new Transition();
                t.setNext(externalSCXML.getInitialstate());
                ini.setTransition(t);
                s.setInitial(ini);
                Map children = externalSCXML.getChildren();
                Iterator childIter = children.values().iterator();
                while (childIter.hasNext()) {

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        if (!c.isEmpty()) {
            if (ini == null) {
                logAndThrowModelError(ERR_STATE_NO_INIT,
                    new Object[] {getStateName(s)});
            }
            Transition initialTransition = ini.getTransition();
            updateTransition(initialTransition, targets);
            initialStates = initialTransition.getTargets();
            // we have to allow for an indirect descendant initial (targets)
            //check that initialState is a descendant of s
            if (initialStates.size() == 0) {
                logAndThrowModelError(ERR_STATE_BAD_INIT,
                    new Object[] {getStateName(s)});
            } else {
                for (int i = 0; i < initialStates.size(); i++) {
                    TransitionTarget initialState = (TransitionTarget)
                        initialStates.get(i);
                    if (!SCXMLHelper.isDescendant(initialState, s)) {
                        logAndThrowModelError(ERR_STATE_BAD_INIT,
                            new Object[] {getStateName(s)});
                    }
                }
            }
        }
        List histories = s.getHistory();
        Iterator histIter = histories.iterator();
        while (histIter.hasNext()) {
            if (s.isSimple()) {
                logAndThrowModelError(ERR_HISTORY_SIMPLE_STATE,
                    new Object[] {getStateName(s)});
            }
            History h = (History) histIter.next();
            Transition historyTransition = h.getTransition();
            if (historyTransition == null) {
                // try to assign initial as default
                if (initialStates != null && initialStates.size() > 0) {
                    for (int i = 0; i < initialStates.size(); i++) {
                        if (initialStates.get(i) instanceof History) {
                            logAndThrowModelError(ERR_HISTORY_BAD_DEFAULT,
                                new Object[] {h.getId(), getStateName(s)});
                        }
                    }
                    historyTransition = new Transition();
                    historyTransition.getTargets().addAll(initialStates);
                    h.setTransition(historyTransition);
                } else {
                    logAndThrowModelError(ERR_HISTORY_NO_DEFAULT,
                        new Object[] {h.getId(), getStateName(s)});
                }
            }
            updateTransition(historyTransition, targets);
            List historyStates = historyTransition.getTargets();
            if (historyStates.size() == 0) {
                logAndThrowModelError(ERR_STATE_NO_HIST,
                    new Object[] {getStateName(s)});
            }
            for (int i = 0; i < historyStates.size(); i++) {
                TransitionTarget historyState = (TransitionTarget)
                    historyStates.get(i);
                if (!h.isDeep()) {
                    if (!c.containsValue(historyState)) {
                        logAndThrowModelError(ERR_STATE_BAD_SHALLOW_HIST,
                            new Object[] {getStateName(s)});
                    }
                } else {
                    if (!SCXMLHelper.isDescendant(historyState, s)) {
                        logAndThrowModelError(ERR_STATE_BAD_DEEP_HIST,
                            new Object[] {getStateName(s)});
                    }
                }
            }
        }
        List t = s.getTransitionsList();
        for (int i = 0; i < t.size(); i++) {
            Transition trn = (Transition) t.get(i);
            updateTransition(trn, targets);
        }
        Parallel p = s.getParallel(); //TODO: Remove in v1.0
        Invoke inv = s.getInvoke();
        if ((inv != null && p != null)

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                    TriggerEvent.CHANGE_EVENT);
            internalEvents.add(te);
        }
        // ExecutePhaseActions / Transitions
        for (Iterator i = step.getTransitList().iterator(); i.hasNext();) {
            Transition t = (Transition) i.next();
            try {
                for (Iterator transitIter = t.getActions().iterator();
                        transitIter.hasNext();) {
                    ((Action) transitIter.next()).execute(evtDispatcher,
                        errRep, scInstance, appLog, internalEvents);
                }
            } catch (SCXMLExpressionException e) {
                errRep.onError(ErrorConstants.EXPRESSION_ERROR,
                    e.getMessage(), t);
            }
            List rtargets = t.getRuntimeTargets();
            for (int j = 0; j < rtargets.size(); j++) {
                TransitionTarget tt = (TransitionTarget) rtargets.get(j);
                nr.fireOnTransition(t, t.getParent(), tt, t);
                nr.fireOnTransition(stateMachine, t.getParent(), tt, t);
            }
        }
        // ExecutePhaseActions / OnEntry
        for (Iterator i = step.getEntryList().iterator(); i.hasNext();) {
            TransitionTarget tt = (TransitionTarget) i.next();

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        LinkedList todoList = new LinkedList(stateSet);
        while (!todoList.isEmpty()) {
            TransitionTarget tt = (TransitionTarget) todoList.removeFirst();
            for (Iterator i = tt.getTransitionsList().iterator();
                    i.hasNext();) {
                Transition t = (Transition) i.next();
                if (!transSet.contains(t)) {
                    transSet.add(t);
                    step.getTransitList().add(t);
                }
            }

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        //remove list (filtered-out list)
        List removeList = new LinkedList();
        //iterate over non-filtered transition set
        for (Iterator iter = step.getTransitList().iterator();
                iter.hasNext();) {
            Transition t = (Transition) iter.next();
            // event check
            String event = t.getEvent();
            if (!eventMatch(event, allEvents)) {
                // t has a non-empty event which is not triggered
                removeList.add(t);
                continue; //makes no sense to eval guard cond.
            }
            // guard condition check
            Boolean rslt;
            String expr = t.getCond();
            if (SCXMLHelper.isStringEmpty(expr)) {
                rslt = Boolean.TRUE;
            } else {
                try {
                    Context ctx = scInstance.getContext(t.getParent());
                    ctx.setLocal(NAMESPACES_KEY, t.getNamespaces());
                    rslt = scInstance.getEvaluator().evalCond(ctx,
                        t.getCond());
                    ctx.setLocal(NAMESPACES_KEY, null);
                } catch (SCXMLExpressionException e) {
                    rslt = Boolean.FALSE;
                    errRep.onError(ErrorConstants.EXPRESSION_ERROR, e
                            .getMessage(), t);
                }
            }
            if (!rslt.booleanValue()) {
                // guard condition has not passed
                removeList.add(t);
            }
        }
        // apply event + guard condition filter
        step.getTransitList().removeAll(removeList);
        // cleanup temporary structures
        allEvents.clear();
        removeList.clear();
        // optimization - global precedence potentially applies
        // only if there are multiple enabled transitions
        if (step.getTransitList().size() > 1) {
            // global transition precedence check
            Object[] trans = step.getTransitList().toArray();
            // non-determinism candidates
            Set nonDeterm = new LinkedHashSet();
            for (int i = 0; i < trans.length; i++) {
                Transition t = (Transition) trans[i];
                TransitionTarget tsrc = t.getParent();
                for (int j = i + 1; j < trans.length; j++) {
                    Transition t2 = (Transition) trans[j];
                    TransitionTarget t2src = t2.getParent();
                    if (SCXMLHelper.isDescendant(t2src, tsrc)) {
                        //t2 takes precedence over t
                        removeList.add(t);
                        break; //it makes no sense to waste cycles with t
                    } else if (SCXMLHelper.isDescendant(tsrc, t2src)) {
                        //t takes precendence over t2
                        removeList.add(t2);
                    } else {
                        //add both to the non-determinism candidates
                        nonDeterm.add(t);
                        nonDeterm.add(t2);
                    }
                }
            }
            // check if all non-deterministic situations have been resolved
            nonDeterm.removeAll(removeList);
            if (nonDeterm.size() > 0) {
                // if not, first one in each state / region (which is also
                // first in document order) wins
                Set regions = new HashSet();
                Iterator iter = nonDeterm.iterator();
                while (iter.hasNext()) {
                    Transition t = (Transition) iter.next();
                    TransitionTarget parent = t.getParent();
                    if (regions.contains(parent)) {
                        removeList.add(t);
                    } else {
                        regions.add(parent);
                    }

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    public Set seedTargetSet(final Set residual, final List transitList,
            final ErrorReporter errRep) {
        Set seedSet = new HashSet();
        Set regions = new HashSet();
        for (Iterator i = transitList.iterator(); i.hasNext();) {
            Transition t = (Transition) i.next();
            //iterate over transitions and add target states
            if (t.getTargets().size() > 0) {
                seedSet.addAll(t.getTargets());
            }
            //build a set of all entered regions
            List paths = t.getPaths();
            for (int j = 0; j < paths.size(); j++) {
                Path p = (Path) paths.get(j);
                if (p.isCrossRegion()) {
                    List regs = p.getRegionsEntered();
                    for (Iterator k = regs.iterator(); k.hasNext();) {

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