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- /*
- * Copyright (C) 2012-present the original author or authors.
- *
- * 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.pf4j;
-
- /**
- * A wrapper over extension instance.
- * It contains the extension descriptor and the extension instance.
- *
- * @author Decebal Suiu
- */
- public class ExtensionWrapper<T> implements Comparable<ExtensionWrapper<T>> {
-
- private final ExtensionDescriptor descriptor;
- private final ExtensionFactory extensionFactory;
- private T extension; // cache
-
- public ExtensionWrapper(ExtensionDescriptor descriptor, ExtensionFactory extensionFactory) {
- this.descriptor = descriptor;
- this.extensionFactory = extensionFactory;
- }
-
- @SuppressWarnings("unchecked")
- public T getExtension() {
- if (extension == null) {
- extension = (T) extensionFactory.create(descriptor.extensionClass);
- }
-
- return extension;
- }
-
- public ExtensionDescriptor getDescriptor() {
- return descriptor;
- }
-
- public int getOrdinal() {
- return descriptor.ordinal;
- }
-
- @Override
- public int compareTo(ExtensionWrapper<T> o) {
- return (getOrdinal() - o.getOrdinal());
- }
-
- }
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