PriceIncreaseValidator.java

package com.medratech.spring.mvc.service;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Service;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;

@Service
public class PriceIncreaseValidator implements Validator {

    private int DEFAULT_MIN_PERCENTAGE = 0;
    private int DEFAULT_MAX_PERCENTAGE = 50;
    private int minPercentage = DEFAULT_MIN_PERCENTAGE;
    private int maxPercentage = DEFAULT_MAX_PERCENTAGE;
    
    private final Logger logger = Logger.getLogger(getClass());

    public boolean supports(Class clazz) {
        return PriceIncrease.class.equals(clazz);
    }

    public void validate(Object obj, Errors errors) {
        PriceIncrease pi = (PriceIncrease) obj;
        if (pi == null) {
            errors.rejectValue("percentage", "error.not-specified", null,
                    "Value required.");
        } else {
            
            if (logger.isDebugEnabled()) {
                logger.info("Validating with " + pi + ": " + pi.getPercentage());
            }
            
            if (pi.getPercentage() > maxPercentage) {
                errors.rejectValue("percentage", "error.too-high",
                        new Object[] { new Integer(maxPercentage) },
                        "Value too high.");
            }
            if (pi.getPercentage() <= minPercentage) {
                errors.rejectValue("percentage", "error.too-low",
                        new Object[] { new Integer(minPercentage) },
                        "Value too low.");
            }
        }
    }

    public void setMinPercentage(int i) {
        minPercentage = i;
    }

    public int getMinPercentage() {
        return minPercentage;
    }

    public void setMaxPercentage(int i) {
        maxPercentage = i;
    }

    public int getMaxPercentage() {
        return maxPercentage;
    }

}