public String intercept()

in core/src/main/java/org/apache/struts2/interceptor/StaticParametersInterceptor.java [134:203]
56 lines of code
12 McCabe index (conditional complexity)

    public String intercept(ActionInvocation invocation) throws Exception {
        ActionConfig config = invocation.getProxy().getConfig();
        Object action = invocation.getAction();

        final Map<String, String> parameters = config.getParams();

        LOG.debug("Setting static parameters: {}", parameters);

        // for actions marked as Parameterizable, pass the static parameters directly
        if (action instanceof Parameterizable) {
            ((Parameterizable) action).setParams(parameters);
        }

        if (parameters != null) {
            ActionContext ac = ActionContext.getContext();
            Map<String, Object> contextMap = ac.getContextMap();
            try {
                ReflectionContextState.setCreatingNullObjects(contextMap, true);
                ReflectionContextState.setReportingConversionErrors(contextMap, true);
                final ValueStack stack = ac.getValueStack();

                ValueStack newStack = valueStackFactory.createValueStack(stack);
                boolean clearableStack = newStack instanceof ClearableValueStack;
                if (clearableStack) {
                    //if the stack's context can be cleared, do that to prevent OGNL
                    //from having access to objects in the stack, see XW-641
                    ((ClearableValueStack)newStack).clearContextValues();
                    Map<String, Object> context = newStack.getContext();
                    ReflectionContextState.setCreatingNullObjects(context, true);
                    ReflectionContextState.setDenyMethodExecution(context, true);
                    ReflectionContextState.setReportingConversionErrors(context, true);

                    //keep locale from original context
                    newStack.getActionContext().withLocale(stack.getActionContext().getLocale());
                }

                for (Map.Entry<String, String> entry : parameters.entrySet()) {
                    Object val = entry.getValue();
                    if (parse && val != null) {
                        val = TextParseUtil.translateVariables(val.toString(), stack);
                    }
                    try {
                        newStack.setValue(entry.getKey(), val);
                    } catch (RuntimeException e) {
                        if (devMode) {

                            String developerNotification = localizedTextProvider.findText(StaticParametersInterceptor.class, "devmode.notification", ActionContext.getContext().getLocale(), "Developer Notification:\n{0}", new Object[]{
                                    "Unexpected Exception caught setting '" + entry.getKey() + "' on '" + action.getClass() + ": " + e.getMessage()
                            });
                            LOG.error(developerNotification);
                            if (action instanceof ValidationAware) {
                                ((ValidationAware) action).addActionMessage(developerNotification);
                            }
                        }
                    }
                }

                 if (clearableStack) {
                     stack.getActionContext().withConversionErrors(newStack.getActionContext().getConversionErrors());
                 }

                if (merge)
                    addParametersToContext(ac, parameters);
            } finally {
                ReflectionContextState.setCreatingNullObjects(contextMap, false);
                ReflectionContextState.setReportingConversionErrors(contextMap, false);
            }
        }
        return invocation.invoke();
    }