org.brushingbits.jnap.struts2.interceptor.RestWorkflowInterceptor.java Source code

Introduction

Here is the source code for org.brushingbits.jnap.struts2.interceptor.RestWorkflowInterceptor.java

Source

/*
 * RestWorkflowInterceptor.java created on 2010-03-31
 *
 * Created by Brushing Bits Labs
 * http://www.brushingbits.org
 *
 * Licensed 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.brushingbits.jnap.struts2.interceptor;

import java.lang.reflect.Method;
import java.util.Map;

import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.StringUtils;
import org.brushingbits.jnap.struts2.MediaTypeManager;
import org.brushingbits.jnap.validation.ValidationBean;
import org.brushingbits.jnap.web.Response;
import org.springframework.util.ReflectionUtils;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ValidationAware;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor;
import com.opensymphony.xwork2.interceptor.ValidationWorkflowAware;
import com.opensymphony.xwork2.interceptor.annotations.InputConfig;

/**
 * @author Daniel Rochetti
 * @since 1.0
 */
public class RestWorkflowInterceptor extends DefaultWorkflowInterceptor {

    protected MediaTypeManager mediaTypeManager;

    @Inject(required = true)
    public void setMediaTypeManager(MediaTypeManager mediaTypeManager) {
        this.mediaTypeManager = mediaTypeManager;
    }

    @Override
    protected String doIntercept(ActionInvocation invocation) throws Exception {
        Object action = invocation.getAction();
        if (action instanceof ValidationAware) {
            ValidationAware validationAware = (ValidationAware) action;
            if (validationAware.hasErrors()) {
                String resultName = findResultName(invocation, action);
                ValidationBean validationEntity = new ValidationBean(validationAware.getActionErrors(),
                        validationAware.getActionMessages(), validationAware.getFieldErrors());
                Response response = Response.invalid(resultName, validationEntity);
                return mediaTypeManager.handle(response);
            }
        }
        return invocation.invoke();
    }

    /**
     * @param invocation
     * @param action
     */
    protected String findResultName(ActionInvocation invocation, Object action) {
        String resultName = Action.INPUT;
        try {
            Map<String, Object> session = ActionContext.getContext().getSession();
            Method method = action.getClass().getMethod(invocation.getProxy().getMethod(),
                    ArrayUtils.EMPTY_CLASS_ARRAY);
            if (action instanceof ValidationWorkflowAware) {
                resultName = ((ValidationWorkflowAware) action).getInputResultName();
            } else if (method.isAnnotationPresent(InputConfig.class)) {
                InputConfig annotation = method.getAnnotation(InputConfig.class);
                if (StringUtils.isNotBlank(annotation.methodName())) {
                    Method inputMethod = action.getClass().getMethod(annotation.methodName());
                    resultName = (String) inputMethod.invoke(action);
                } else {
                    resultName = annotation.resultName();
                }
            } else if (session.containsKey(InputResultInterceptor.INPUT_RESULT_NAME)) {
                resultName = (String) session.get(InputResultInterceptor.INPUT_RESULT_NAME);
            }
        } catch (Exception e) {
            ReflectionUtils.handleReflectionException(e);
        }
        return resultName;
    }

}