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-rw-r--r--infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/ReflectionUtils.java79
1 files changed, 79 insertions, 0 deletions
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/ReflectionUtils.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/ReflectionUtils.java
new file mode 100644
index 000000000..728c4f80d
--- /dev/null
+++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/ReflectionUtils.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.honeycomb.v3po.translate.util;
+
+import com.google.common.base.Optional;
+import java.lang.reflect.Method;
+import java.util.List;
+import javax.annotation.Nonnull;
+
+/**
+ * Reflection based utilities
+ */
+public final class ReflectionUtils {
+
+ private ReflectionUtils() {}
+
+ /**
+ * Find a specific method using reflection
+ *
+ * @param managedType Class object to find method in
+ * @param prefix Method name prefix used when finding the method. Case does not matter.
+ * @param paramTypes List of input argument types
+ * @param retType Return type
+ *
+ * @return Found method or Optional.absent() if there's no such method
+ */
+ @Nonnull
+ public static Optional<Method> findMethodReflex(@Nonnull final Class<?> managedType,
+ @Nonnull final String prefix,
+ @Nonnull final List<Class<?>> paramTypes,
+ @Nonnull final Class<?> retType) {
+ for (Method method : managedType.getMethods()) {
+ if (isMethodMatch(prefix, paramTypes, retType, method)) {
+ return Optional.of(method);
+ }
+ }
+
+ return Optional.absent();
+ }
+
+ private static boolean isMethodMatch(final @Nonnull String prefix,
+ final @Nonnull List<Class<?>> paramTypes,
+ final @Nonnull Class<?> retType, final Method method) {
+ if (!method.getName().toLowerCase().startsWith(prefix.toLowerCase())) {
+ return false;
+ }
+
+ final Class<?>[] parameterTypes = method.getParameterTypes();
+ if (parameterTypes.length != paramTypes.size()) {
+ return false;
+ }
+
+ for (int i = 0; i < parameterTypes.length; i++) {
+ if (!parameterTypes[i].isAssignableFrom(paramTypes.get(i))) {
+ return false;
+ }
+ }
+
+ if (!method.getReturnType().equals(retType)) {
+ return false;
+ }
+
+ return true;
+ }
+}