Count.java
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上传日期:2018-01-08
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文件大小:3k
- /**
- * 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.shell;
- import java.io.*;
- import java.util.List;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.fs.FileSystem;
- import org.apache.hadoop.fs.Path;
- /**
- * Count the number of directories, files, bytes, quota, and remaining quota.
- */
- public class Count extends Command {
- public static final String NAME = "count";
- public static final String USAGE = "-" + NAME + "[-q] <path>";
- public static final String DESCRIPTION = CommandUtils.formatDescription(USAGE,
- "Count the number of directories, files and bytes under the paths",
- "that match the specified file pattern. The output columns are:",
- "DIR_COUNT FILE_COUNT CONTENT_SIZE FILE_NAME or",
- "QUOTA REMAINING_QUATA SPACE_QUOTA REMAINING_SPACE_QUOTA ",
- " DIR_COUNT FILE_COUNT CONTENT_SIZE FILE_NAME");
-
- private boolean qOption;
- /** Constructor
- *
- * @param cmd the count command
- * @param pos the starting index of the arguments
- */
- public Count(String[] cmd, int pos, Configuration conf) {
- super(conf);
- CommandFormat c = new CommandFormat(NAME, 1, Integer.MAX_VALUE, "q");
- List<String> parameters = c.parse(cmd, pos);
- this.args = parameters.toArray(new String[parameters.size()]);
- if (this.args.length == 0) { // default path is the current working directory
- this.args = new String[] {"."};
- }
- this.qOption = c.getOpt("q") ? true: false;
- }
-
- /** Check if a command is the count command
- *
- * @param cmd A string representation of a command starting with "-"
- * @return true if this is a count command; false otherwise
- */
- public static boolean matches(String cmd) {
- return ("-" + NAME).equals(cmd);
- }
- @Override
- public String getCommandName() {
- return NAME;
- }
- @Override
- protected void run(Path path) throws IOException {
- FileSystem fs = path.getFileSystem(getConf());
- System.out.println(fs.getContentSummary(path).toString(qOption) + path);
- }
- }