85 lines
3.3 KiB
Java
85 lines
3.3 KiB
Java
/**
|
|
*
|
|
* Copyright © 2014-2019 Florian Schmaus
|
|
*
|
|
* 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.jivesoftware.smack.provider;
|
|
|
|
import java.io.IOException;
|
|
import java.lang.reflect.ParameterizedType;
|
|
import java.lang.reflect.Type;
|
|
|
|
import org.jivesoftware.smack.packet.Element;
|
|
import org.jivesoftware.smack.packet.XmlEnvironment;
|
|
import org.jivesoftware.smack.parsing.SmackParsingException;
|
|
import org.jivesoftware.smack.util.ParserUtils;
|
|
|
|
import org.jivesoftware.smack.xml.XmlPullParser;
|
|
import org.jivesoftware.smack.xml.XmlPullParserException;
|
|
|
|
/**
|
|
* Smack provider are the parsers used to deserialize raw XMPP into the according Java {@link Element}s.
|
|
* <p>
|
|
* At any time when {@link #parse(XmlPullParser, int, XmlEnvironment)} is invoked any type of exception can be thrown. If the parsed
|
|
* element does not follow the specification, for example by putting a string where only integers are allowed, then a
|
|
* {@link org.jivesoftware.smack.SmackException} should be thrown.
|
|
* </p>
|
|
*
|
|
* @author Florian Schmaus
|
|
* @param <E> the type of the resulting element.
|
|
*/
|
|
public abstract class Provider<E extends Element> {
|
|
|
|
private final Class<E> elementClass;
|
|
|
|
@SuppressWarnings("unchecked")
|
|
protected Provider() {
|
|
Type currentType = getClass().getGenericSuperclass();
|
|
while (!(currentType instanceof ParameterizedType)) {
|
|
Class<?> currentClass = (Class<?>) currentType;
|
|
currentType = currentClass.getGenericSuperclass();
|
|
}
|
|
ParameterizedType parameterizedGenericSuperclass = (ParameterizedType) currentType;
|
|
Type[] actualTypeArguments = parameterizedGenericSuperclass.getActualTypeArguments();
|
|
Type elementType = actualTypeArguments[0];
|
|
|
|
elementClass = (Class<E>) elementType;
|
|
}
|
|
|
|
public final Class<E> getElementClass() {
|
|
return elementClass;
|
|
}
|
|
|
|
public final E parse(XmlPullParser parser) throws IOException, XmlPullParserException, SmackParsingException {
|
|
return parse(parser, null);
|
|
}
|
|
|
|
public final E parse(XmlPullParser parser, XmlEnvironment outerXmlEnvironment) throws IOException, XmlPullParserException, SmackParsingException {
|
|
// XPP3 calling convention assert: Parser should be at start tag
|
|
ParserUtils.assertAtStartTag(parser);
|
|
|
|
final int initialDepth = parser.getDepth();
|
|
final XmlEnvironment xmlEnvironment = XmlEnvironment.from(parser, outerXmlEnvironment);
|
|
|
|
E e = parse(parser, initialDepth, xmlEnvironment);
|
|
|
|
// XPP3 calling convention assert: Parser should be at end tag of the consumed/parsed element
|
|
ParserUtils.forwardToEndTagOfDepth(parser, initialDepth);
|
|
return e;
|
|
}
|
|
|
|
public abstract E parse(XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment) throws XmlPullParserException, IOException, SmackParsingException;
|
|
}
|