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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 org.mozilla.thirdparty.com.google.android.exoplayer2.util;
import androidx.annotation.Nullable;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
/**
* {@link XmlPullParser} utility methods.
*/
public final class XmlPullParserUtil {
private XmlPullParserUtil() {}
/**
* Returns whether the current event is an end tag with the specified name.
*
* @param xpp The {@link XmlPullParser} to query.
* @param name The specified name.
* @return Whether the current event is an end tag with the specified name.
* @throws XmlPullParserException If an error occurs querying the parser.
*/
public static boolean isEndTag(XmlPullParser xpp, String name) throws XmlPullParserException {
return isEndTag(xpp) && xpp.getName().equals(name);
}
/**
* Returns whether the current event is an end tag.
*
* @param xpp The {@link XmlPullParser} to query.
* @return Whether the current event is an end tag.
* @throws XmlPullParserException If an error occurs querying the parser.
*/
public static boolean isEndTag(XmlPullParser xpp) throws XmlPullParserException {
return xpp.getEventType() == XmlPullParser.END_TAG;
}
/**
* Returns whether the current event is a start tag with the specified name.
*
* @param xpp The {@link XmlPullParser} to query.
* @param name The specified name.
* @return Whether the current event is a start tag with the specified name.
* @throws XmlPullParserException If an error occurs querying the parser.
*/
public static boolean isStartTag(XmlPullParser xpp, String name) throws XmlPullParserException {
return isStartTag(xpp) && xpp.getName().equals(name);
}
/**
* Returns whether the current event is a start tag.
*
* @param xpp The {@link XmlPullParser} to query.
* @return Whether the current event is a start tag.
* @throws XmlPullParserException If an error occurs querying the parser.
*/
public static boolean isStartTag(XmlPullParser xpp) throws XmlPullParserException {
return xpp.getEventType() == XmlPullParser.START_TAG;
}
/**
* Returns whether the current event is a start tag with the specified name. If the current event
* has a raw name then its prefix is stripped before matching.
*
* @param xpp The {@link XmlPullParser} to query.
* @param name The specified name.
* @return Whether the current event is a start tag with the specified name.
* @throws XmlPullParserException If an error occurs querying the parser.
*/
public static boolean isStartTagIgnorePrefix(XmlPullParser xpp, String name)
throws XmlPullParserException {
return isStartTag(xpp) && stripPrefix(xpp.getName()).equals(name);
}
/**
* Returns the value of an attribute of the current start tag.
*
* @param xpp The {@link XmlPullParser} to query.
* @param attributeName The name of the attribute.
* @return The value of the attribute, or null if the current event is not a start tag or if no
* such attribute was found.
*/
public static @Nullable String getAttributeValue(XmlPullParser xpp, String attributeName) {
int attributeCount = xpp.getAttributeCount();
for (int i = 0; i < attributeCount; i++) {
if (xpp.getAttributeName(i).equals(attributeName)) {
return xpp.getAttributeValue(i);
}
}
return null;
}
/**
* Returns the value of an attribute of the current start tag. Any raw attribute names in the
* current start tag have their prefixes stripped before matching.
*
* @param xpp The {@link XmlPullParser} to query.
* @param attributeName The name of the attribute.
* @return The value of the attribute, or null if the current event is not a start tag or if no
* such attribute was found.
*/
public static @Nullable String getAttributeValueIgnorePrefix(
XmlPullParser xpp, String attributeName) {
int attributeCount = xpp.getAttributeCount();
for (int i = 0; i < attributeCount; i++) {
if (stripPrefix(xpp.getAttributeName(i)).equals(attributeName)) {
return xpp.getAttributeValue(i);
}
}
return null;
}
private static String stripPrefix(String name) {
int prefixSeparatorIndex = name.indexOf(':');
return prefixSeparatorIndex == -1 ? name : name.substring(prefixSeparatorIndex + 1);
}
}
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