adamantal commented on a change in pull request #568: HADOOP-15691 Add PathCapabilities to FS and FC to complement StreamCapabilities URL: https://github.com/apache/hadoop/pull/568#discussion_r295710769
########## File path: hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/impl/PathCapabilitiesSupport.java ########## @@ -0,0 +1,47 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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.apache.hadoop.fs.impl; + +import java.util.Locale; + +import org.apache.hadoop.classification.InterfaceAudience; +import org.apache.hadoop.classification.InterfaceStability; +import org.apache.hadoop.fs.Path; + +import static com.google.common.base.Preconditions.checkArgument; + [email protected] [email protected] +public class PathCapabilitiesSupport { + + /** + * Validate the arguments to {@code PathCapabilities.hadCapability()}. + * @param path path to query the capability of. + * @param capability non-null, non-empty string to query the path for support. + * @return the string to use in a switch statement. + * @throws IllegalArgumentException if a an argument is invalid. + */ + public static String validatePathCapabilityArgs( + final Path path, final String capability) { + checkArgument(path != null, "null path"); + checkArgument(capability != null && !capability.isEmpty(), + "null/empty capability"); Review comment: Can we form a proper sentence there? Also I was wondering whether it would be helpful from audience side to distinguish the null and the empty case (moving it to a separate `checkArgument`). ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
