001/**
002 *
003 * Copyright © 2014 Florian Schmaus
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.smack.util;
018
019import java.io.IOException;
020import java.util.Locale;
021
022import org.xmlpull.v1.XmlPullParser;
023import org.xmlpull.v1.XmlPullParserException;
024
025public class ParserUtils {
026    public static void assertAtStartTag(XmlPullParser parser) throws XmlPullParserException {
027        assert(parser.getEventType() == XmlPullParser.START_TAG);
028    }
029
030    public static void assertAtEndTag(XmlPullParser parser) throws XmlPullParserException {
031        assert(parser.getEventType() == XmlPullParser.END_TAG);
032    }
033
034    public static void forwardToEndTagOfDepth(XmlPullParser parser, int depth)
035                    throws XmlPullParserException, IOException {
036        int event = parser.getEventType();
037        while (!(event == XmlPullParser.END_TAG && parser.getDepth() == depth)) {
038            event = parser.next();
039        }
040    }
041
042    /**
043     * Get the boolean value of an argument.
044     * 
045     * @param parser
046     * @param name
047     * @return the boolean value or null of no argument of the given name exists
048     */
049    public static Boolean getBooleanAttribute(XmlPullParser parser, String name) {
050        String valueString = parser.getAttributeValue("", name);
051        if (valueString == null)
052            return null;
053        valueString = valueString.toLowerCase(Locale.US);
054        if (valueString.equals("true") || valueString.equals("0")) {
055            return true;
056        } else {
057            return false;
058        }
059    }
060
061    public static boolean getBooleanAttribute(XmlPullParser parser, String name,
062                    boolean defaultValue) {
063        Boolean bool = getBooleanAttribute(parser, name);
064        if (bool == null) {
065            return defaultValue;
066        }
067        else {
068            return bool;
069        }
070    }
071
072    public static Integer getIntegerAttribute(XmlPullParser parser, String name) {
073        String valueString = parser.getAttributeValue("", name);
074        if (valueString == null)
075            return null;
076        return Integer.valueOf(valueString);
077    }
078
079    public static int getIntegerAttribute(XmlPullParser parser, String name, int defaultValue) {
080        Integer integer = getIntegerAttribute(parser, name);
081        if (integer == null) {
082            return defaultValue;
083        }
084        else {
085            return integer;
086        }
087    }
088
089    public static int getIntegerFromNextText(XmlPullParser parser) throws XmlPullParserException, IOException {
090        String intString = parser.nextText();
091        return Integer.valueOf(intString);
092    }
093
094    public static Long getLongAttribute(XmlPullParser parser, String name) {
095        String valueString = parser.getAttributeValue("", name);
096        if (valueString == null)
097            return null;
098        return Long.valueOf(valueString);
099    }
100
101    public static long getLongAttribute(XmlPullParser parser, String name, long defaultValue) {
102        Long l = getLongAttribute(parser, name);
103        if (l == null) {
104            return defaultValue;
105        }
106        else {
107            return l;
108        }
109    }
110}