/* * Copyright (C) 2015 Noorq, Inc. * * 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 com.noorq.casser.mapping.validator; import javax.validation.ConstraintValidator; import javax.validation.ConstraintValidatorContext; import com.noorq.casser.mapping.annotation.Constraints.LowerCase; public final class LowerCaseValidator implements ConstraintValidator<LowerCase, CharSequence> { @Override public void initialize(LowerCase constraintAnnotation) { } @Override public boolean isValid(CharSequence value, ConstraintValidatorContext context) { if (value == null) { return true; } final int len = value.length(); for (int i = 0; i != len; ++i) { char c = value.charAt(i); if (c <= 0x7F) { if (isUpperCaseLetter(c)) { return false; } } if (c != Character.toLowerCase(c)) { return false; } } return true; } private static boolean isUpperCaseLetter(char ch) { return ch >= 'A' && ch <= 'Z'; } }