Add Mycilla code to odlguice

[odlguice.git] / inject / inject-guice-extensions / injection / src / main / java / org / opendaylight / odlguice / inject / guice / extensions / injection / MethodInvoker.java

diff --git a/inject/inject-guice-extensions/injection/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/injection/MethodInvoker.java b/inject/inject-guice-extensions/injection/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/injection/MethodInvoker.java
new file mode 100755 (executable)
index 0000000..e996998
--- /dev/null
+++ b/inject/inject-guice-extensions/injection/src/main/java/org/opendaylight/odlguice/inject/guice/extensions/injection/MethodInvoker.java
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) 2010 Mycila (mathieu.carbou@gmail.com)
+ *
+ * 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.opendaylight.odlguice.inject.guice.extensions.injection;
+
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.inject.internal.BytecodeGen;
+import com.google.inject.internal.cglib.core.$CodeGenerationException;
+import com.google.inject.internal.cglib.reflect.$FastMethod;
+import java.lang.annotation.Annotation;
+import java.lang.reflect.AnnotatedElement;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Member;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.concurrent.ExecutionException;
+
+/**
+ * This code originated in https://github.com/mycila/guice and was forked into
+ * OpenDaylight.
+ * @author Mathieu Carbou (mathieu.carbou@gmail.com)
+ */
+@SuppressWarnings("checkstyle:finalClass")
+public class MethodInvoker implements Member, AnnotatedElement {
+
+    private static final LoadingCache<Method, MethodInvoker> INVOKERS = CacheBuilder.newBuilder().weakKeys()
+            .build(new CacheLoader<Method, MethodInvoker>() {
+                @SuppressWarnings("unchecked")
+                @Override
+                public MethodInvoker load(final Method method) throws Exception {
+                    int modifiers = method.getModifiers();
+                    if (!Modifier.isPrivate(modifiers) && !Modifier.isProtected(modifiers)) {
+                        try {
+                            final $FastMethod fastMethod = BytecodeGen
+                                    .newFastClassForMember(method.getDeclaringClass(), method).getMethod(method);
+                            return new MethodInvoker(method) {
+                                @Override
+                                public Object invoke(Object target, Object... parameters) {
+                                    try {
+                                        return fastMethod.invoke(target, parameters);
+                                    } catch (InvocationTargetException e) {
+                                        throw MycilaGuiceException.toRuntime(e);
+                                    }
+                                }
+                            };
+                        } catch ($CodeGenerationException e) {
+                            /* fall-through */
+                        }
+                    }
+                    if (!Modifier.isPublic(modifiers)
+                            || !Modifier.isPublic(method.getDeclaringClass().getModifiers())) {
+//                        method.setAccessible(true);
+                        AccessController.doPrivileged((PrivilegedAction) () -> {
+                            method.setAccessible(true);
+                            return null;
+                        });
+                    }
+                    return new MethodInvoker(method);
+                }
+            });
+
+    public final Method method;
+
+    private MethodInvoker(Method method) {
+        this.method = method;
+    }
+
+    public Object invoke(Object target, Object... parameters) {
+        try {
+            return method.invoke(target, parameters);
+        } catch (IllegalAccessException e) {
+            throw MycilaGuiceException.toRuntime(e);
+        } catch (InvocationTargetException e) {
+            throw MycilaGuiceException.toRuntime(e);
+        }
+    }
+
+    public static MethodInvoker on(Method method) {
+        try {
+            return INVOKERS.get(method);
+        } catch (ExecutionException e) {
+            throw MycilaGuiceException.toRuntime(e);
+        }
+    }
+
+    @Override
+    public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
+        return Reflect.isAnnotationPresent(method, annotationClass);
+    }
+
+    @Override
+    public Annotation[] getAnnotations() {
+        return method.getAnnotations();
+    }
+
+    @Override
+    public int getModifiers() {
+        return method.getModifiers();
+    }
+
+    @Override
+    public String getName() {
+        return method.getName();
+    }
+
+    @Override
+    public Class<?> getDeclaringClass() {
+        return method.getDeclaringClass();
+    }
+
+    @Override
+    public Annotation[] getDeclaredAnnotations() {
+        return method.getDeclaredAnnotations();
+    }
+
+    @Override
+    public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
+        return method.getAnnotation(annotationClass);
+    }
+
+    @Override
+    public boolean isSynthetic() {
+        return method.isSynthetic();
+    }
+
+    @Override
+    public String toString() {
+        return method.toString();
+    }
+}