hadoop PathCapabilitiesSupport 源码
haddop PathCapabilitiesSupport 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/impl/PathCapabilitiesSupport.java
/*
* 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 org.apache.hadoop.fs.PathCapabilities;
import static org.apache.hadoop.util.Preconditions.checkArgument;
@InterfaceAudience.Private
@InterfaceStability.Evolving
public class PathCapabilitiesSupport {
/**
* Validate the arguments to
* {@link PathCapabilities#hasPathCapability(Path, String)}.
* @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 parameter is null");
checkArgument(!capability.isEmpty(),
"capability parameter is empty string");
return capability.toLowerCase(Locale.ENGLISH);
}
}
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