🐛 Fix build

cloud-core/src/main/java/cloud/commandframework/annotations/injection/ParameterInjector.java

@@ -0,0 +1,53 @@
+//
+// MIT License
+//
+// Copyright (c) 2020 Alexander Söderberg & Contributors
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+package cloud.commandframework.annotations.injection;
+
+import cloud.commandframework.annotations.AnnotationAccessor;
+import cloud.commandframework.context.CommandContext;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Injector that injects parameters into CommandMethod annotated
+ * methods
+ *
+ * @param <C> Command sender type
+ * @param <T> Type of the value that is injected by this injector
+ * @since 1.2.0
+ */
+@FunctionalInterface
+public interface ParameterInjector<C, T> {
+
+    /**
+     * Attempt to create a a value that should then be injected into the CommandMethod
+     * annotated method. If the injector cannot (or shouldn't) create a value, it is free to return {@code null}.
+     *
+     * @param context            Command context that is requesting the injection
+     * @param annotationAccessor Annotation accessor proxying the method which the value is being injected into
+     * @return The value, if it could be created. Else {@code null}, in which case no value will be injected
+     *         by this particular injector
+     */
+    @Nullable T create(@NonNull CommandContext<C> context, @NonNull AnnotationAccessor annotationAccessor);
+
+}