001/*
002 * IzPack - Copyright 2001-2005 Julien Ponge, All Rights Reserved.
003 * 
004 * http://www.izforge.com/izpack/
005 * http://developer.berlios.de/projects/izpack/
006 * 
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 * 
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *     
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020package com.izforge.izpack.util;
021
022import java.util.Map;
023
024import org.apache.regexp.RE;
025
026import com.izforge.izpack.panels.ProcessingClient;
027import com.izforge.izpack.panels.RuleInputField;
028import com.izforge.izpack.panels.Validator;
029
030/**
031 * A validator to enforce non-empty fields.
032 * 
033 * This validator can be used for rule input fields in the UserInputPanel to make sure that the
034 * user's entry matches a specified regular expression.
035 * 
036 * @author Mike Cunneen <mike dot cunneen at screwfix dot com>
037 */
038public class RegularExpressionValidator implements Validator
039{
040
041    public static final String STR_PATTERN_DEFAULT = "[a-zA-Z0-9._-]{3,}@[a-zA-Z0-9._-]+([.][a-zA-Z0-9_-]+)*[.][a-zA-Z0-9._-]{2,4}";
042
043    private static final String PATTERN_PARAM = "pattern";
044
045    public boolean validate(ProcessingClient client)
046    {
047
048        String patternString;
049
050        RuleInputField field = (RuleInputField) client;
051        if (field.hasParams())
052        {
053            Map paramMap = field.getValidatorParams();
054            patternString = (String) paramMap.get(PATTERN_PARAM);
055
056        }
057        else
058        {
059            patternString = STR_PATTERN_DEFAULT;
060        }
061
062        RE pattern = new RE(patternString);
063        return pattern.match(((RuleInputField) client).getText());
064    }
065
066}