/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.shell.command;
import alluxio.AlluxioURI;
import alluxio.client.block.AlluxioBlockStore;
import alluxio.client.file.FileSystem;
import alluxio.client.file.URIStatus;
import alluxio.exception.AlluxioException;
import com.google.common.base.Preconditions;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.concurrent.ThreadSafe;
/**
* Displays the path's info.
* If path is a directory it displays the directory's info.
* If path is a file, it displays the file's all blocks info.
*/
@ThreadSafe
public final class StatCommand extends WithWildCardPathCommand {
/**
* @param fs the filesystem of Alluxio
*/
public StatCommand(FileSystem fs) {
super(fs);
}
@Override
public String getCommandName() {
return "stat";
}
@Override
public Options getOptions() {
return new Options().addOption(
Option.builder("f")
.required(false)
.hasArg()
.desc("format")
.build()
);
}
@Override
protected void runCommand(AlluxioURI path, CommandLine cl) throws AlluxioException, IOException {
URIStatus status = mFileSystem.getStatus(path);
if (cl.hasOption('f')) {
System.out.println(formatOutput(cl, status));
} else {
if (status.isFolder()) {
System.out.println(path + " is a directory path.");
System.out.println(status);
} else {
System.out.println(path + " is a file path.");
System.out.println(status);
System.out.println("Containing the following blocks: ");
AlluxioBlockStore blockStore = AlluxioBlockStore.create();
for (long blockId : status.getBlockIds()) {
System.out.println(blockStore.getInfo(blockId));
}
}
}
}
@Override
public String getUsage() {
return "stat [-f <format>] <path>";
}
@Override
public String getDescription() {
return "Displays info for the specified path both file and directory."
+ " Specify -f to display info in given format:"
+ " \"%N\": name of the file;"
+ " \"%z\": size of file in bytes;"
+ " \"%u\": owner;"
+ " \"%g\": group name of owner;"
+ " \"%y\" or \"%Y\": modification time,"
+ " %y shows 'yyyy-MM-dd HH:mm:ss' (the UTC date),"
+ " %Y it shows milliseconds since January 1, 1970 UTC;"
+ " \"%b\": Number of blocks allocated for file";
}
private static final String FORMAT_REGEX = "%([bguyzNY])";
private static final Pattern FORMAT_PATTERN = Pattern.compile(FORMAT_REGEX);
private String formatOutput(CommandLine cl, URIStatus status) {
String format = cl.getOptionValue('f');
int formatLen = format.length();
StringBuilder output = new StringBuilder();
Matcher m = FORMAT_PATTERN.matcher(format);
int i = 0;
while (i < formatLen && m.find(i)) {
if (m.start() != i) {
output.append(format.substring(i, m.start()));
}
output.append(getField(m, status));
i = m.end();
}
if (i < formatLen) {
output.append(format.substring(i));
}
return output.toString();
}
private String getField(Matcher m, URIStatus status) {
char formatSpecifier = m.group(1).charAt(0);
String resp = null;
switch (formatSpecifier) {
case 'b':
resp = status.isFolder() ? "NA" : String.valueOf(status.getFileBlockInfos().size());
break;
case 'g':
resp = status.getGroup();
break;
case 'u':
resp = status.getOwner();
break;
case 'y':
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
resp = sdf.format(new Date(status.getLastModificationTimeMs()));
break;
case 'z':
resp = status.isFolder() ? "NA" : String.valueOf(status.getLength());
break;
case 'N':
resp = status.getName();
break;
case 'Y':
resp = String.valueOf(status.getLastModificationTimeMs());
break;
default:
Preconditions.checkArgument(false, "Unknown format specifier %c", formatSpecifier);
}
return resp;
}
}