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package com.googlecode.struts2webflow;

import java.util.Map;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
import com.opensymphony.xwork2.util.ValueStack;

/**
 * A helper intercepter that maintains the flow execution key in the session
 * rather than pushing it out to the client.
 */
public class SessionFlowExecKeyInterceptor implements Interceptor {
    public static final String DEFAULT_SESSION_KEY = "SessionFlowExecKeyInterceptor.SESSION_KEY";

    /**
     * Location in the session where the flow exec key is stored between flow
     * requests.
     */
    private String sessionKey = DEFAULT_SESSION_KEY;

    public void init() {
    }

    public String intercept(ActionInvocation invocation) throws Exception {
        Map session = invocation.getInvocationContext().getSession();
        ValueStack stack = invocation.getStack();

        String flowExecKey = (String) session.get(sessionKey);
        if(flowExecKey != null) {
            stack.setValue("flowExecutionKey", flowExecKey);
        }
        String result = invocation.invoke();
        flowExecKey = (String) stack.findValue("flowExecutionKey");
        session.put(sessionKey, flowExecKey);
        return result;
    }

    public void destroy() {
    }

    public String getSessionKey() {
        return sessionKey;
    }

    public void setSessionKey(String sessionKey) {
        this.sessionKey = sessionKey;
    }
}