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;
023import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement;
024import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.BasicValidateElement;
025import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.ListRange;
026import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.OpenValidateElement;
027import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.RangeValidateElement;
028import org.jivesoftware.smackx.xdatavalidation.packet.ValidateElement.RegexValidateElement;
029import org.xmlpull.v1.XmlPullParser;
030import org.xmlpull.v1.XmlPullParserException;
031
032/**
033 * Extension Provider for Data validation of forms.
034 *
035 * @author Anno van Vliet
036 *
037 */
038public class DataValidationProvider {
039    private static final Logger LOGGER = Logger.getLogger(DataValidationProvider.class.getName());
040
041    public static ValidateElement parse(XmlPullParser parser) throws XmlPullParserException, IOException {
042        final int initialDepth = parser.getDepth();
043        final String dataType = parser.getAttributeValue("", "datatype");
044        ValidateElement dataValidation = null;
045        ListRange listRange = null;
046
047        outerloop: while (true) {
048            int eventType = parser.next();
049            switch (eventType) {
050            case XmlPullParser.START_TAG:
051                switch (parser.getName()) {
052                case OpenValidateElement.METHOD:
053                    dataValidation = new OpenValidateElement(dataType);
054                    break;
055                case BasicValidateElement.METHOD:
056                    dataValidation = new BasicValidateElement(dataType);
057                    break;
058                case RangeValidateElement.METHOD:
059                    dataValidation = new RangeValidateElement(dataType,
060                                    parser.getAttributeValue("", "min"),
061                                    parser.getAttributeValue("", "max")
062                                    );
063                    break;
064                case RegexValidateElement.METHOD:
065                    dataValidation = new RegexValidateElement(dataType,parser.nextText());
066                    break;
067                case ListRange.ELEMENT:
068                    Long min = ParserUtils.getLongAttribute(parser, "min");
069                    Long max = ParserUtils.getLongAttribute(parser, "max");
070                    if (min != null || max != null) {
071                        listRange = new ListRange(min, max);
072                    } else {
073                        LOGGER.fine("Ignoring list-range element without min or max attribute");
074                    }
075                    break;
076                default:
077                    break;
078                }
079                break;
080            case XmlPullParser.END_TAG:
081                if (parser.getDepth() == initialDepth) {
082                    if (dataValidation == null) {
083                        // XEP-122 ยง 3.2 states that "If no validation method is specified,
084                        // form processors MUST assume <basic/> validation."
085                        dataValidation = new BasicValidateElement(dataType);
086                    }
087                    dataValidation.setListRange(listRange);
088                    break outerloop;
089                }
090                break;
091            }
092        }
093        return dataValidation;
094    }
095
096}