SpringValidatorHolder.java

package cn.org.rapid_framework.util.holder;

import org.springframework.beans.factory.BeanCreationException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.validation.BindException;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
/**
 * 用于持有Spring Validator,使调用Validator可以当静态方法使用.
 * 
 * <pre>
 * static 方法调用:
 * SpringValidatorHolder.validate(object);
 * </pre>
 * <pre>
 * spring配置:
 * <bean class="cn.org.rapid_framework.beanvalidation.SpringValidatorHolder">
 * 	 <preperty name="validator" ref="validator"/>
 * </bean>
 * </pre> 
 * @author badqiu
 *
 */
public class SpringValidatorHolder implements InitializingBean{
	private static Validator validator;

	public void afterPropertiesSet() throws Exception {
		if(validator == null) throw new BeanCreationException("not found spring 'validator' for SpringValidatorHolder ");
	}
	
	@SuppressWarnings("all")
	public void setValidator(Validator v) {
		if(validator != null) {
			throw new IllegalStateException("SpringValidatorHolder already holded 'validator'");
		}
		validator = v;
	}

	private static Validator getRequiredValidator() {
		if(validator == null)
			throw new IllegalStateException("'validator' property is null,SpringValidatorHolder not yet init.");
		return validator;
	}
	
	public static Validator getValidator() {
		return getRequiredValidator();
	}

	public static boolean supports(Class<?> type) {
		return getRequiredValidator().supports(type);
	}

	public static void validate(Object object, Errors errors) {
		getRequiredValidator().validate(object, errors);
	}
	
	/**
	 * 验证失败将抛出异常
	 * @param object
	 * @throws BindException
	 */
	public static void validate(Object object) throws BindException {
		BeanPropertyBindingResult errors = new BeanPropertyBindingResult(object, object.getClass().getSimpleName(), true);
		getRequiredValidator().validate(object, errors);
		if(errors.hasErrors()) {
			throw new BindException(errors);
		}
	}
	
	public static void cleanHolder() {
		validator = null;
	}
}