001/**
002 *
003 * Copyright 2014 Anno van Vliet
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smackx.xdatavalidation.provider;
018
019import java.io.IOException;
020import java.util.logging.Logger;
021
022import org.jivesoftware.smack.util.ParserUtils;
023
024import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement;
025import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.BasicValidateElement;
026import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.ListRange;
027import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.OpenValidateElement;
028import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.RangeValidateElement;
029import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.RegexValidateElement;
030
031import org.xmlpull.v1.XmlPullParser;
032import org.xmlpull.v1.XmlPullParserException;
033
034/**
035 * Extension Provider for Data validation of forms.
036 *
037 * @author Anno van Vliet
038 *
039 */
040public class DataValidationProvider {
041    private static final Logger LOGGER = Logger.getLogger(DataValidationProvider.class.getName());
042
043    public static ValidateElement parse(XmlPullParser parser) throws XmlPullParserException, IOException {
044        final int initialDepth = parser.getDepth();
045        final String dataType = parser.getAttributeValue("", "datatype");
046        ValidateElement dataValidation = null;
047        ListRange listRange = null;
048
049        outerloop: while (true) {
050            int eventType = parser.next();
051            switch (eventType) {
052            case XmlPullParser.START_TAG:
053                switch (parser.getName()) {
054                case OpenValidateElement.METHOD:
055                    dataValidation = new OpenValidateElement(dataType);
056                    break;
057                case BasicValidateElement.METHOD:
058                    dataValidation = new BasicValidateElement(dataType);
059                    break;
060                case RangeValidateElement.METHOD:
061                    dataValidation = new RangeValidateElement(dataType,
062                                    parser.getAttributeValue("", "min"),
063                                    parser.getAttributeValue("", "max")
064                                    );
065                    break;
066                case RegexValidateElement.METHOD:
067                    dataValidation = new RegexValidateElement(dataType,parser.nextText());
068                    break;
069                case ListRange.ELEMENT:
070                    Long min = ParserUtils.getLongAttribute(parser, "min");
071                    Long max = ParserUtils.getLongAttribute(parser, "max");
072                    if (min != null || max != null) {
073                        listRange = new ListRange(min, max);
074                    } else {
075                        LOGGER.fine("Ignoring list-range element without min or max attribute");
076                    }
077                    break;
078                default:
079                    break;
080                }
081                break;
082            case XmlPullParser.END_TAG:
083                if (parser.getDepth() == initialDepth) {
084                    if (dataValidation == null) {
085                        // XEP-122 ยง 3.2 states that "If no validation method is specified,
086                        // form processors MUST assume <basic/> validation."
087                        dataValidation = new BasicValidateElement(dataType);
088                    }
089                    dataValidation.setListRange(listRange);
090                    break outerloop;
091                }
092                break;
093            }
094        }
095        return dataValidation;
096    }
097
098}