diff options
Diffstat (limited to 'v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/util/ReflectionUtils.java')
-rw-r--r-- | v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/util/ReflectionUtils.java | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/util/ReflectionUtils.java b/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/util/ReflectionUtils.java new file mode 100644 index 000000000..db560622c --- /dev/null +++ b/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/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.vpp.facade.impl.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; + } +} |