cascading.tap.Dfs.java Source code

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Here is the source code for cascading.tap.Dfs.java

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/*
 * Copyright (c) 2007-2010 Concurrent, Inc. All Rights Reserved.
 *
 * Project and contact information: http://www.cascading.org/
 *
 * This file is part of the Cascading project.
 *
 * Cascading is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Cascading is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cascading.  If not, see <http://www.gnu.org/licenses/>.
 */

package cascading.tap;

import java.beans.ConstructorProperties;
import java.io.IOException;
import java.net.URI;

import cascading.scheme.Scheme;
import cascading.tuple.Fields;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.mapred.JobConf;

/**
 * Class Dfs is a {@link Tap} class that provides access to the Hadoop Distributed File System.
 * <p/>
 * Use the {@link URI} constructors to specify a different HDFS cluster than the default.
 */
public class Dfs extends Hfs {

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param fields of type Fields
     * @param uri    of type URI
     */
    @ConstructorProperties({ "fields", "uri" })
    public Dfs(Fields fields, URI uri) {
        super(fields, uri.getPath());

        if (!uri.getScheme().equalsIgnoreCase("hdfs"))
            throw new IllegalArgumentException("uri must use the hdfs scheme");

        setUriScheme(URI.create(uri.getScheme() + "://" + uri.getAuthority()));
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param fields  of type Fields
     * @param uri     of type URI
     * @param replace of type boolean
     */
    @ConstructorProperties({ "fields", "uri", "replace" })
    public Dfs(Fields fields, URI uri, boolean replace) {
        super(fields, uri.getPath(), replace);

        if (!uri.getScheme().equalsIgnoreCase("hdfs"))
            throw new IllegalArgumentException("uri must use the hdfs scheme");

        setUriScheme(URI.create(uri.getScheme() + "://" + uri.getAuthority()));
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param fields   of type Fields
     * @param uri      of type URI
     * @param sinkMode of type SinkMode
     */
    @ConstructorProperties({ "fields", "uri", "sinkMode" })
    public Dfs(Fields fields, URI uri, SinkMode sinkMode) {
        super(fields, uri.getPath(), sinkMode);

        if (!uri.getScheme().equalsIgnoreCase("hdfs"))
            throw new IllegalArgumentException("uri must use the hdfs scheme");

        setUriScheme(URI.create(uri.getScheme() + "://" + uri.getAuthority()));
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param fields     of type Fields
     * @param stringPath of type String
     */
    @ConstructorProperties({ "fields", "stringPath" })
    public Dfs(Fields fields, String stringPath) {
        super(fields, stringPath);
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param fields     of type Fields
     * @param stringPath of type String
     * @param replace    of type boolean
     */
    @ConstructorProperties({ "fields", "stringPath", "replace" })
    public Dfs(Fields fields, String stringPath, boolean replace) {
        super(fields, stringPath, replace);
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param fields     of type Fields
     * @param stringPath of type String
     * @param sinkMode   of type SinkMode
     */
    @ConstructorProperties({ "fields", "stringPath", "sinkMode" })
    public Dfs(Fields fields, String stringPath, SinkMode sinkMode) {
        super(fields, stringPath, sinkMode);
    }

    @ConstructorProperties({ "scheme" })
    Dfs(Scheme scheme) {
        super(scheme);
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param scheme of type Scheme
     * @param uri    of type URI
     */
    @ConstructorProperties({ "scheme", "uri" })
    public Dfs(Scheme scheme, URI uri) {
        super(scheme, uri.getPath());

        if (!uri.getScheme().equalsIgnoreCase("hdfs"))
            throw new IllegalArgumentException("uri must use the hdfs scheme");

        setUriScheme(URI.create(uri.getScheme() + "://" + uri.getAuthority()));
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param scheme  of type Scheme
     * @param uri     of type URI
     * @param replace of type boolean
     */
    @ConstructorProperties({ "scheme", "uri", "replace" })
    public Dfs(Scheme scheme, URI uri, boolean replace) {
        super(scheme, uri.getPath(), replace);

        if (!uri.getScheme().equalsIgnoreCase("hdfs"))
            throw new IllegalArgumentException("uri must use the hdfs scheme");

        setUriScheme(URI.create(uri.getScheme() + "://" + uri.getAuthority()));
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param scheme   of type Scheme
     * @param uri      of type URI
     * @param sinkMode of type SinkMode
     */
    @ConstructorProperties({ "scheme", "uri", "sinkMode" })
    public Dfs(Scheme scheme, URI uri, SinkMode sinkMode) {
        super(scheme, uri.getPath(), sinkMode);

        if (!uri.getScheme().equalsIgnoreCase("hdfs"))
            throw new IllegalArgumentException("uri must use the hdfs scheme");

        setUriScheme(URI.create(uri.getScheme() + "://" + uri.getAuthority()));
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param scheme     of type Scheme
     * @param stringPath of type String
     */
    @ConstructorProperties({ "scheme", "stringPath" })
    public Dfs(Scheme scheme, String stringPath) {
        super(scheme, stringPath);
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param scheme     of type Scheme
     * @param stringPath of type String
     * @param replace    of type boolean
     */
    @ConstructorProperties({ "scheme", "stringPath", "replace" })
    public Dfs(Scheme scheme, String stringPath, boolean replace) {
        super(scheme, stringPath, replace);
    }

    /**
     * Constructor Dfs creates a new Dfs instance.
     *
     * @param scheme     of type Scheme
     * @param stringPath of type String
     * @param sinkMode   of type SinkMode
     */
    @ConstructorProperties({ "scheme", "stringPath", "sinkMode" })
    public Dfs(Scheme scheme, String stringPath, SinkMode sinkMode) {
        super(scheme, stringPath, sinkMode);
    }

    protected void setStringPath(String stringPath) {
        if (stringPath.matches(".*://.*") && !stringPath.startsWith("hdfs://"))
            throw new IllegalArgumentException("uri must use the hdfs scheme");

        super.setStringPath(stringPath);
    }

    @Override
    protected FileSystem getDefaultFileSystem(JobConf jobConf) throws IOException {
        String name = jobConf.get("fs.default.name", "hdfs://localhost:5001/");

        if (name.equals("local") || name.matches(".*://.*") && !name.startsWith("hdfs://"))
            name = "hdfs://localhost:5001/";
        else if (name.indexOf('/') == -1)
            name = "hdfs://" + name;

        return FileSystem.get(URI.create(name), jobConf);
    }
}