55 lines
2.0 KiB
Java
55 lines
2.0 KiB
Java
/**
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*
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* Copyright 2019-2020 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack.provider;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import org.jivesoftware.smack.packet.Element;
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public class AbstractProvider<E extends Element> {
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private final Class<E> elementClass;
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@SuppressWarnings("unchecked")
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protected AbstractProvider() {
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Type currentType = getClass().getGenericSuperclass();
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while (!(currentType instanceof ParameterizedType)) {
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Class<?> currentClass = (Class<?>) currentType;
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currentType = currentClass.getGenericSuperclass();
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}
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ParameterizedType parameterizedGenericSuperclass = (ParameterizedType) currentType;
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Type[] actualTypeArguments = parameterizedGenericSuperclass.getActualTypeArguments();
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Type elementType = actualTypeArguments[0];
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if (elementType instanceof Class) {
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elementClass = (Class<E>) elementType;
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} else if (elementType instanceof ParameterizedType) {
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ParameterizedType parameteriezedElementType = (ParameterizedType) elementType;
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elementClass = (Class<E>) parameteriezedElementType.getRawType();
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} else {
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throw new AssertionError(
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"Element type '" + elementType + "' is neither of type Class or ParameterizedType");
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}
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}
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public final Class<E> getElementClass() {
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return elementClass;
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}
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}
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