alluxio.cli.fs.command.WithWildCardPathCommand.java Source code

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Here is the source code for alluxio.cli.fs.command.WithWildCardPathCommand.java

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/*
 * 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.cli.fs.command;

import alluxio.AlluxioURI;
import alluxio.client.file.FileSystem;
import alluxio.exception.AlluxioException;
import alluxio.cli.fs.FileSystemShellUtils;

import com.google.common.base.Joiner;
import org.apache.commons.cli.CommandLine;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import javax.annotation.concurrent.ThreadSafe;

/**
 * An abstract class for the commands that take exactly one path that could contain wildcard
 * characters.
 *
 * It will first do a glob against the input pattern then run the command for each expanded path.
 */
@ThreadSafe
public abstract class WithWildCardPathCommand extends AbstractFileSystemCommand {

    protected WithWildCardPathCommand(FileSystem fs) {
        super(fs);
    }

    /**
     * Actually runs the command against one expanded path.
     *
     * @param path the expanded input path
     * @param cl the parsed command line object including options
     */
    protected abstract void runCommand(AlluxioURI path, CommandLine cl) throws AlluxioException, IOException;

    @Override
    protected int getNumOfArgs() {
        return 1;
    }

    @Override
    public int run(CommandLine cl) throws AlluxioException, IOException {
        String[] args = cl.getArgs();
        for (String arg : args) {
            AlluxioURI inputPath = new AlluxioURI(arg);

            List<AlluxioURI> paths = FileSystemShellUtils.getAlluxioURIs(mFileSystem, inputPath);
            if (paths.size() == 0) { // A unified sanity check on the paths
                throw new IOException(inputPath + " does not exist.");
            }
            Collections.sort(paths, createAlluxioURIComparator());

            List<String> errorMessages = new ArrayList<>();
            for (AlluxioURI path : paths) {
                try {
                    runCommand(path, cl);
                } catch (AlluxioException | IOException e) {
                    errorMessages.add(e.getMessage() != null ? e.getMessage() : e.toString());
                }
            }

            if (errorMessages.size() != 0) {
                throw new IOException(Joiner.on('\n').join(errorMessages));
            }
        }
        return 0;
    }

    private static Comparator<AlluxioURI> createAlluxioURIComparator() {
        return new Comparator<AlluxioURI>() {
            @Override
            public int compare(AlluxioURI tUri1, AlluxioURI tUri2) {
                // ascending order
                return tUri1.getPath().compareTo(tUri2.getPath());
            }
        };
    }
}