de.thksystems.validation.beanvalidation.OccurenceValidator Maven / Gradle / Ivy

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package de.thksystems.validation.beanvalidation;

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

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

import org.springframework.util.ReflectionUtils;

public class OccurenceValidator implements ConstraintValidator> {

	private String getterName;

	private String getterValue;

	private boolean ignoreCase;

	private int min;

	private int max;

	@Override
	public void initialize(Occurence constraintAnnotation) {
		getterName = constraintAnnotation.getterName();
		getterValue = constraintAnnotation.value();
		ignoreCase = constraintAnnotation.ignoreCase();
		min = constraintAnnotation.min();
		max = constraintAnnotation.max();

	}

	@Override
	public boolean isValid(Collection list, ConstraintValidatorContext context) {
		if (list.isEmpty()) {
			return true;
		}
		Class elemClass = list.iterator().next().getClass();
		Method elemMethod = ReflectionUtils.findMethod(elemClass, getterName);
		if (elemMethod == null) {
			return false;
		}
		int valueCount = 0;
		for (Object elemObj : list) {
			Object elemFieldValue = ReflectionUtils.invokeMethod(elemMethod, elemObj);
			if (elemFieldValue != null) {
				if (ignoreCase) {
					if (elemFieldValue.toString().equalsIgnoreCase(getterValue)) {
						valueCount++;
					}
				} else {
					if (elemFieldValue.toString().equals(getterValue)) {
						valueCount++;
					}
				}
			}
		}
		return valueCount >= min && (valueCount <= max || max == 0);
	}
}