Examples of org.apache.commons.scxml2.Evaluator

org.apache.commons.scxml2.SCXMLExpressionException
Interface for a component that may be used by the SCXML engines to evaluate the expressions within the SCXML document.

     */
    @Override
    public void execute(ActionExecutionContext exctx) throws ModelException, SCXMLExpressionException {
        EnterableState parentState = getParentEnterableState();
        Context ctx = exctx.getContext(parentState);
        Evaluator eval = exctx.getEvaluator();
        ctx.setLocal(getNamespacesKey(), getNamespaces());
        Boolean rslt;
        try {
            rslt = eval.evalCond(ctx, cond);
            if (rslt == null) {
                if (exctx.getAppLog().isDebugEnabled()) {
                    exctx.getAppLog().debug("Treating as false because the cond expression was evaluated as null: '"
                            + cond + "'");
                }
                rslt = Boolean.FALSE;
            }
        } catch (SCXMLExpressionException e) {
            rslt = Boolean.FALSE;
            exctx.getInternalIOProcessor().addEvent(new TriggerEvent(TriggerEvent.ERROR_EXECUTION, TriggerEvent.ERROR_EVENT));
            exctx.getErrorReporter().onError(ErrorConstants.EXPRESSION_ERROR, "Treating as false due to error: "
                    + e.getMessage(), this);
        }
        execute = rslt;
        ctx.setLocal(getNamespacesKey(), null);
        // The "if" statement is a "container"
        for (Action aa : actions) {
            if (execute && !(aa instanceof ElseIf)) {
                aa.execute(exctx);
            } else if (execute && aa instanceof ElseIf) {
                break;
            } else if (aa instanceof Else) {
                execute = true;
            } else if (aa instanceof ElseIf) {
                ctx.setLocal(getNamespacesKey(), getNamespaces());
                execute = eval.evalCond(ctx, ((ElseIf) aa).getCond());
                ctx.setLocal(getNamespacesKey(), null);
            }
        }
    }

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    public void execute(ActionExecutionContext exctx) throws ModelException, SCXMLExpressionException {
        // Send attributes evaluation
        EnterableState parentState = getParentEnterableState();
        Context ctx = exctx.getContext(parentState);
        ctx.setLocal(getNamespacesKey(), getNamespaces());
        Evaluator eval = exctx.getEvaluator();
        // Most attributes of <send> are expressions so need to be
        // evaluated before the EventDispatcher callback
        Object hintsValue = null;
        if (hints != null) {
            hintsValue = eval.eval(ctx, hints);
        }
        String targetValue = target;
        if (target != null) {
            targetValue = (String) eval.eval(ctx, target);
            if ((targetValue == null || targetValue.trim().length() == 0)
                    && exctx.getAppLog().isWarnEnabled()) {
                exctx.getAppLog().warn("<send>: target expression \"" + target
                    + "\" evaluated to null or empty String");
            }
        }
        String typeValue;
        if (type != null) {
            typeValue = (String) eval.eval(ctx, type);
            if ((typeValue == null || typeValue.trim().length() == 0)
                    && exctx.getAppLog().isWarnEnabled()) {
                exctx.getAppLog().warn("<send>: type expression \"" + type
                    + "\" evaluated to null or empty String");
            }
        } else {
            // must default to 'scxml' when unspecified
            typeValue = TYPE_SCXML;
        }
        Map<String, Object> params = null;
        if (namelist != null) {
            StringTokenizer tkn = new StringTokenizer(namelist);
            params = new HashMap<String, Object>(tkn.countTokens());
            while (tkn.hasMoreTokens()) {
                String varName = tkn.nextToken();
                Object varObj = ctx.get(varName);
                if (varObj == null) {
                    //considered as a warning here
                    exctx.getErrorReporter().onError(ErrorConstants.UNDEFINED_VARIABLE,
                            varName + " = null", parentState);
                }
                params.put(varName, varObj);
            }
        }
        long wait = 0L;
        if (delay != null) {
            Object delayValue = eval.eval(ctx, delay);
            if (delayValue != null) {
                String delayString = delayValue.toString();
                wait = parseDelay(delayString, exctx.getAppLog());
            }
        }
        String eventValue = event;
        if (event != null) {
            eventValue = (String) eval.eval(ctx, event);
            if ((eventValue == null || eventValue.trim().length() == 0) && exctx.getAppLog().isWarnEnabled()) {
                exctx.getAppLog().warn("<send>: event expression \"" + event
                    + "\" evaluated to null or empty String");
            }
        }

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     */
    @Override
    public void execute(ActionExecutionContext exctx) throws ModelException, SCXMLExpressionException {
        EnterableState parentState = getParentEnterableState();
        Context ctx = exctx.getContext(parentState);
        Evaluator eval = exctx.getEvaluator();
        ctx.setLocal(getNamespacesKey(), getNamespaces());
        // "location" gets preference over "name"
        if (location != null) {
            Node oldNode = eval.evalLocation(ctx, location);
            if (oldNode != null) {
                //// rvalue may be ...
                // a Node, if so, import it at location
                Node newNode;
                try {
                    if (src != null && src.trim().length() > 0) {
                        newNode = getSrcNode();
                    } else {
                        newNode = eval.evalLocation(ctx, expr);
                    }
                    // Remove all children
                    Node removeChild = oldNode.getFirstChild();
                    while (removeChild != null) {
                        Node nextChild = removeChild.getNextSibling();
                        oldNode.removeChild(removeChild);
                        removeChild = nextChild;
                    }
                    if (newNode != null) {
                        // Adopt new children
                        for (Node child = newNode.getFirstChild();
                                child != null;
                                child = child.getNextSibling()) {
                            Node importedNode = oldNode.getOwnerDocument().
                                importNode(child, true);
                            oldNode.appendChild(importedNode);
                        }
                    }
                } catch (SCXMLExpressionException see) {
                    // or something else, stuff toString() into lvalue
                    Object valueObject = eval.eval(ctx, expr);
                    setNodeValue(oldNode, valueObject.toString());
                }
                if (exctx.getAppLog().isDebugEnabled()) {
                    exctx.getAppLog().debug("<assign>: data node '" + oldNode.getNodeName()
                        + "' updated");
                }
                /* TODO: send to notificationRegistry instead?
                TriggerEvent ev = new TriggerEvent(name + ".change",
                    TriggerEvent.CHANGE_EVENT);
                exctx.addInternalEvent(ev);
                */
            } else {
                exctx.getAppLog().error("<assign>: location does not point to"
                    + " a <data> node");
            }
        } else {
            // lets try "name" (usage as in Sep '05 WD, useful with <var>)
            if (!ctx.has(name)) {
                exctx.getErrorReporter().onError(ErrorConstants.UNDEFINED_VARIABLE, name
                    + " = null", parentState);
            } else {
                Object varObj;
                if (src != null && src.trim().length() > 0) {
                    varObj = getSrcNode();
                } else {
                    varObj = eval.eval(ctx, expr);
                }
                ctx.set(name, varObj);
                if (exctx.getAppLog().isDebugEnabled()) {
                    exctx.getAppLog().debug("<assign>: Set variable '" + name + "' to '"
                        + String.valueOf(varObj) + "'");

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     */
    @Override
    public void execute(ActionExecutionContext exctx) throws ModelException, SCXMLExpressionException {
        Context ctx = isGlobalScript() ? exctx.getGlobalContext() : exctx.getContext(getParentEnterableState());
        ctx.setLocal(getNamespacesKey(), getNamespaces());
        Evaluator eval = exctx.getEvaluator();
        eval.evalScript(ctx, getScript());
        ctx.setLocal(getNamespacesKey(), null);
    }

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     * @param statesToInvoke the set of activated states which invokes need to be invoked
     */
    public void initiateInvokes(final SCXMLExecutionContext exctx,
                                final Set<TransitionalState> statesToInvoke) {
        SCInstance scInstance = exctx.getScInstance();
        Evaluator eval = exctx.getEvaluator();
        for (TransitionalState ts : statesToInvoke) {
            if (ts.getInvokes().isEmpty()) {
                continue;
            }
            Context context = scInstance.getContext(ts);
            for (Invoke i : ts.getInvokes()) {
                String src = i.getSrc();
                if (src == null) {
                    String srcexpr = i.getSrcexpr();
                    Object srcObj;
                    try {
                        context.setLocal(Context.NAMESPACES_KEY, i.getNamespaces());
                        srcObj = eval.eval(context, srcexpr);
                        context.setLocal(Context.NAMESPACES_KEY, null);
                        src = String.valueOf(srcObj);
                    } catch (SCXMLExpressionException see) {
                        exctx.getInternalIOProcessor().addEvent(new TriggerEvent(TriggerEvent.ERROR_EXECUTION, TriggerEvent.ERROR_EVENT));
                        exctx.getErrorReporter().onError(ErrorConstants.EXPRESSION_ERROR, see.getMessage(), i);
                    }
                }
                String source = src;
                PathResolver pr = i.getPathResolver();
                if (pr != null) {
                    source = i.getPathResolver().resolvePath(src);
                }
                Invoker inv;
                try {
                    inv = exctx.newInvoker(i.getType());
                } catch (InvokerException ie) {
                    exctx.getInternalIOProcessor().addEvent(new TriggerEvent("failed.invoke."+ts.getId(), TriggerEvent.ERROR_EVENT));
                    continue;
                }
                List<Param> params = i.params();
                Map<String, Object> args = new HashMap<String, Object>();
                for (Param p : params) {
                    String argExpr = p.getExpr();
                    Object argValue = null;
                    context.setLocal(Context.NAMESPACES_KEY, p.getNamespaces());
                    // Do we have an "expr" attribute?
                    if (argExpr != null && argExpr.trim().length() > 0) {
                        try {
                            argValue = eval.eval(context, argExpr);
                        } catch (SCXMLExpressionException see) {
                            exctx.getInternalIOProcessor().addEvent(new TriggerEvent(TriggerEvent.ERROR_EXECUTION, TriggerEvent.ERROR_EVENT));
                            exctx.getErrorReporter().onError(ErrorConstants.EXPRESSION_ERROR, see.getMessage(), i);
                        }
                    } else {
                        // No. Does value of "name" attribute refer to a valid
                        // location in the data model?
                        try {
                            argValue = eval.evalLocation(context, p.getName());
                            if (argValue == null) {
                                // Generate error, 4.3.1 in WD-scxml-20080516
                                exctx.getInternalIOProcessor().addEvent(new TriggerEvent(ts.getId() + ERR_ILLEGAL_ALLOC, TriggerEvent.ERROR_EVENT));
                            }
                        } catch (SCXMLExpressionException see) {

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        } catch (IOException ioe) {
            throw new InvokerException(ioe.getMessage(), ioe.getCause());
        } catch (XMLStreamException xse) {
            throw new InvokerException(xse.getMessage(), xse.getCause());
        }
        executor = new SCXMLExecutor(evaluator, new SimpleDispatcher(), new SimpleErrorReporter());
        Context rootCtx = evaluator.newContext(null);
        for (Map.Entry<String, Object> entry : params.entrySet()) {
            rootCtx.setLocal(entry.getKey(), entry.getValue());
        }
        executor.setRootContext(rootCtx);

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     * @param rootCtx The root context
     * @param evaluator The expression evaluator
     */
    private void initialize(final SCXML stateMachine,
            final Context rootCtx, final Evaluator evaluator) throws ModelException {
        engine = new SCXMLExecutor(evaluator, new SimpleDispatcher(),
            new SimpleErrorReporter());
        engine.setStateMachine(stateMachine);
        engine.setRootContext(rootCtx);
        engine.addListener(stateMachine, new EntryListener());
        try {

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        if (expr == null) {
            return null;
        }


        if (!(ctx instanceof GroovyContext)) {
            throw new SCXMLExpressionException(ERR_CTX_TYPE);
        }


        GroovyContext groovyCtx = (GroovyContext) ctx;
        if (groovyCtx.getGroovyEvaluator() == null) {
            groovyCtx.setGroovyEvaluator(this);
        }
        try {
            return getScript(getEffectiveContext(groovyCtx), groovyCtx.getScriptBaseClass(), expr).run();
        } catch (Exception e) {
            String exMessage = e.getMessage() != null ? e.getMessage() : e.getClass().getCanonicalName();
            throw new SCXMLExpressionException("eval('" + expr + "'): " + exMessage, e);
        }
    }

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        if (expr == null) {
            return null;
        }


        if (!(ctx instanceof GroovyContext)) {
            throw new SCXMLExpressionException(ERR_CTX_TYPE);
        }


        GroovyContext groovyCtx = (GroovyContext) ctx;
        if (groovyCtx.getGroovyEvaluator() == null) {
            groovyCtx.setGroovyEvaluator(this);
        }
        try {
            return (Boolean)getScript(getEffectiveContext(groovyCtx), groovyCtx.getScriptBaseClass(), expr).run();
        } catch (Exception e) {
            String exMessage = e.getMessage() != null ? e.getMessage() : e.getClass().getCanonicalName();
            throw new SCXMLExpressionException("evalCond('" + expr + "'): " + exMessage, e);
        }
    }

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        if (expr == null) {
            return null;
        }


        if (!(ctx instanceof GroovyContext)) {
            throw new SCXMLExpressionException(ERR_CTX_TYPE);
        }


        GroovyContext groovyCtx = (GroovyContext) ctx;
        if (groovyCtx.getGroovyEvaluator() == null) {
            groovyCtx.setGroovyEvaluator(this);
        }
        try {
            final GroovyContext effective = getEffectiveContext(groovyCtx);
            effective.setEvaluatingLocation(true);
            return (Node)getScript(effective, groovyCtx.getScriptBaseClass(), expr).run();
        } catch (Exception e) {
            String exMessage = e.getMessage() != null ? e.getMessage() : e.getClass().getCanonicalName();
            throw new SCXMLExpressionException("evalLocation('" + expr + "'): " + exMessage, e);
        }
    }

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