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package com.servicerocket.confluence.randombits.conveyor.xwork;

import com.opensymphony.xwork.Action;
import com.opensymphony.xwork.ActionContext;
import com.opensymphony.xwork.ActionInvocation;
import com.opensymphony.xwork.config.entities.ActionConfig;
import com.opensymphony.xwork.interceptor.Interceptor;

/**
 * Handles injecting override-related values and working around method calls, etc.
 */
public class OverrideInterceptor implements Interceptor {

    public void destroy() {
    }

    public void init() {
    }

    public String intercept(ActionInvocation actionInvocation) throws Exception {
        ActionContext actionContext = actionInvocation.getInvocationContext();
        ActionConfig actionConfig = actionInvocation.getProxy().getConfig();
        String methodName = actionConfig != null ? actionConfig.getMethodName() : null;
        String actionName = actionContext != null ? actionContext.getName() : null;

        try {
            Action action = actionInvocation.getAction();
            if (action instanceof OverriddenAction) {
                OverriddenAction overriddenAction = (OverriddenAction) action;
                if (actionName != null) {
                    ActionRequest request = ActionRequest.parse(actionName);

                    overriddenAction.setActionRequest(request);
                    overriddenAction.setTargetMethod(request.getMethodName());

                    // Hide the method name for this call.
                    if (actionConfig != null) {
                        actionConfig.setMethodName(null);
                    }
                    actionContext.setName(request.getActionName());
                }
            }
            return actionInvocation.invoke();
        } finally {
            if (actionConfig != null) {
                actionConfig.setMethodName(methodName);
            }
            if (actionContext != null) {
                actionContext.setName(actionName);
            }
        }
    }
}