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package com.mockrunner.struts;

import java.lang.reflect.Method;

import org.apache.struts.action.ActionMapping;
import org.apache.struts.config.ActionConfig;

import com.mockrunner.base.NestedApplicationException;
import com.mockrunner.mock.web.MockActionMapping;
import com.mockrunner.util.common.MethodUtil;

/**
 * Helper class to generate CGLib proxies for ActionMapping. Not meant for application use.
 */
public class ActionMappingProxyGenerator
{
    private final static Method[] delegateMethods;
    private final static Method[] duplicateMethods;
    static
    {
        delegateMethods = new Method[3];
        try
        {
            delegateMethods[0] = MockActionMapping.class.getDeclaredMethod("findForward", new Class[] {String.class});
            delegateMethods[1] = MockActionMapping.class.getDeclaredMethod("findForwards", null);
            delegateMethods[2] = MockActionMapping.class.getDeclaredMethod("getInputForward", null);
            duplicateMethods = MethodUtil.getMatchingDeclaredMethods(ActionConfig.class, "(set.*)|(remove.*)|(add.*)");
        } 
        catch(Exception exc)
        {
            throw new NestedApplicationException(exc);
        }
    }
    
    
    private MockActionMapping delegateMapping;
    
    public ActionMappingProxyGenerator(MockActionMapping delegateMapping)
    {
        this.delegateMapping = delegateMapping;
    }
    
    public ActionMapping createActionMappingProxy(Class mappingClass)
    {
        if(null == mappingClass) return null;
        if(!ActionMapping.class.isAssignableFrom(mappingClass))
        {
            throw new ClassCastException(mappingClass.getClass().getName() + " must be an instance of " + ActionMapping.class.getName());
        }
        DynamicMockProxyGenerator generator = new DynamicMockProxyGenerator(mappingClass, delegateMapping, delegateMethods, duplicateMethods);
        return (ActionMapping)generator.createProxy();
    }
}