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/*
 * Copyright 2010 Google 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.google.gwt.validation.client.constraints;

import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Pattern.Flag;

/**
 * EXPERIMENTAL and subject to change. Do not use this in
 * production code.
 * 

* {@link Pattern} constraint validator implementation. *

* Note this implementation uses {@link RegExp} which differs from * {@link java.util.regex.Pattern}. */ public class PatternValidator implements ConstraintValidator { private RegExp pattern; public void initialize(Pattern annotation) { Pattern.Flag flags[] = annotation.flags(); String flagString = ""; for (Pattern.Flag flag : flags) { flagString += toString(flag); } pattern = RegExp.compile(annotation.regexp(), flagString); } public boolean isValid(String value, ConstraintValidatorContext context) { if (value == null) { return true; } MatchResult match = pattern.exec(value); if (match == null) { return false; } // Must match the entire string return match.getGroup(0).length() == value.length(); } private String toString(Flag flag) { String value; switch (flag) { case CASE_INSENSITIVE: case UNICODE_CASE: value = "i"; break; case MULTILINE: value = "m"; break; default: throw new IllegalArgumentException(flag + " is not a suppoted gwt Pattern (RegExp) flag"); } return value; } }





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