/*
 * $Id: AnnotationValidationInterceptor.java 502294 2007-02-01 17:28:00Z niallp $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.struts2.interceptor.validation;

import java.lang.reflect.Method;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.validator.ValidationInterceptor;

/**
 * Extends the xwork validation interceptor to also check for a @SkipValidation
 * annotation, and if found, don't validate this action method
 */
public class AnnotationValidationInterceptor extends ValidationInterceptor {
    
    /** Auto-generated serialization id */
    private static final long serialVersionUID = 1813272797367431184L;

    protected String doIntercept(ActionInvocation invocation) throws Exception {
        
        Object action = invocation.getAction();
        if (action != null) {
            Method method = getActionMethod(action.getClass(), invocation.getProxy().getMethod());
            SkipValidation skip = (SkipValidation) method.getAnnotation(SkipValidation.class);
            if (skip != null) {
                return invocation.invoke();
            }
        }
        
        return super.doIntercept(invocation);
    }
    
    // FIXME: This is copied from DefaultActionInvocation but should be exposed through the interface
    protected Method getActionMethod(Class actionClass, String methodName) throws NoSuchMethodException {
        Method method;
        try {
            method = actionClass.getMethod(methodName, new Class[0]);
        } catch (NoSuchMethodException e) {
            // hmm -- OK, try doXxx instead
            try {
                String altMethodName = "do" + methodName.substring(0, 1).toUpperCase() + methodName.substring(1);
                method = actionClass.getMethod(altMethodName, new Class[0]);
            } catch (NoSuchMethodException e1) {
                // throw the original one
                throw e;
            }
        }
        return method;
    }
}