| /* |
| * Copyright (c) OSGi Alliance (2017). All Rights Reserved. |
| * |
| * 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.osgi.util.converter; |
| |
| import java.lang.reflect.Type; |
| |
| import org.osgi.annotation.versioning.ProviderType; |
| import org.osgi.util.function.Function; |
| |
| /** |
| * This interface is used to specify the target function to perform conversions. |
| * This function can be used multiple times. A {@link Functioning} instance can |
| * be obtained via the {@link Converter}. |
| * |
| * @author $Id$ |
| */ |
| @ProviderType |
| public interface Functioning extends Specifying<Functioning> { |
| /** |
| * Specify the target object type for the conversion as a class object. |
| * |
| * @param cls The class to convert to. |
| * @param <T> The type to convert to. |
| * @return A function that can perform the conversion. |
| */ |
| <T> Function<Object,T> to(Class<T> cls); |
| |
| /** |
| * Specify the target object type as a Java Reflection Type object. |
| * |
| * @param type A Type object to represent the target type to be converted |
| * to. |
| * @param <T> The type to convert to. |
| * @return A function that can perform the conversion. |
| */ |
| <T> Function<Object,T> to(Type type); |
| |
| /** |
| * Specify the target object type as a {@link TypeReference}. If the target |
| * class carries generics information a TypeReference should be used as this |
| * preserves the generic information whereas a Class object has this |
| * information erased. Example use: |
| * |
| * <pre> |
| * List<String> result = converter.function() |
| * .to(new TypeReference<List<String>>() {}); |
| * </pre> |
| * |
| * @param ref A type reference to the object being converted to. |
| * @param <T> The type to convert to. |
| * @return A function that can perform the conversion. |
| */ |
| <T> Function<Object,T> to(TypeReference<T> ref); |
| } |