ExamModifyController.java from crlove at Krugle

Show ExamModifyController.java syntax highlighted

package com.witfriend.apollo.web.controller;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.collections.MapUtils;
import org.apache.commons.collections.keyvalue.DefaultMapEntry;
import org.apache.commons.lang.ClassUtils;
import org.apache.commons.lang.StringUtils;

import org.springframework.beans.factory.annotation.Required;
import org.springframework.beans.propertyeditors.StringTrimmerEditor;
import org.springframework.validation.BindException;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;
import org.springframework.web.bind.ServletRequestDataBinder;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

import com.witfriend.apollo.domain.Exam;
import com.witfriend.apollo.domain.exception.exam.ExamExistedException;
import com.witfriend.apollo.service.ExamService;
import com.witfriend.apollo.web.validator.ExamValidator;
import com.witfriend.zeus.domain.exception.IdentifierRequiredException;
import com.witfriend.zeus.domain.exception.IllegalIdentifierException;
import com.witfriend.zeus.web.validator.IdentifierValidator;

/**
 * DOCUMENT ME!
 * @author wangyz
 * @since 2006.10.07
 * @version $Id$
 */
public class ExamModifyController extends SimpleFormController {
	private ExamService examService;
	
	public ExamModifyController() {
		Class<Exam> clazz = Exam.class;
		
		setBindOnNewForm(true);
		setCommandClass(clazz);
		setCommandName(StringUtils.uncapitalize(ClassUtils.getShortClassName(clazz)));
		setSessionForm(true);
		setSupportedMethods(new String[] {METHOD_GET, METHOD_POST});
		setValidators(new Validator[] {
				IdentifierValidator.getInstance(),
				ExamValidator.getInstance()
		});
	}
	
	@Required
	public void setExamService(ExamService examService) {
		this.examService = examService;
	}
	
	@Override
	protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception {
		binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));
		
		binder.setAllowedFields(isFormSubmission(request) ? new String[] {Exam.IDENTIFIER_PROPERTY_NAME, "title"} : new String[] {Exam.IDENTIFIER_PROPERTY_NAME});
		binder.setRequiredFields(binder.getAllowedFields());
	}
	
	@Override
	protected void onBindOnNewForm(HttpServletRequest request, Object command, BindException errors) throws Exception {
		onBind(request, command, errors);
		
		ValidationUtils.invokeValidator(getValidator(), command, errors);
		
		onBindAndValidate(request, command, errors);
	}
	
	@Override
	protected void onBind(HttpServletRequest request, Object command, BindException errors) throws Exception {
		if(errors.hasFieldErrors(Exam.IDENTIFIER_PROPERTY_NAME)) {
			throw new IdentifierRequiredException();
		}
	}
	
	@Override
	protected void onBindAndValidate(HttpServletRequest request, Object command, BindException errors) throws Exception {
		if(errors.hasFieldErrors(Exam.IDENTIFIER_PROPERTY_NAME)) {
			throw new IllegalIdentifierException(Exam.class.cast(command).getId());
		}
	}
	
	@Override
	protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception {
		try {
			return new ModelAndView(onSubmit(command, errors).getViewName()).addObject(Exam.IDENTIFIER_PROPERTY_NAME, Exam.class.cast(command).getId());
		} catch(ExamExistedException eee) {
			errors.reject(eee.getCode(), eee.getArguments(), eee.getMessage());
		}
		
		return showForm(request, response, errors);
	}
	
	@Override
	protected void doSubmitAction(Object command) throws Exception {
		examService.modify(Exam.class.cast(command));
	}
	
	@Override
	protected Map referenceData(HttpServletRequest request, Object command, Errors errors) throws Exception {
		Exam exam =	examService.load(Exam.class.cast(command).getId());
		
		if(!isFormSubmission(request)) {
			request.getSession().setAttribute(getFormSessionAttributeName(request), exam);
		}
		
		return MapUtils.putAll(new HashMap(), new Map.Entry[] {
			new DefaultMapEntry(getCommandName(), exam)
		});
	}
}
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