org.gridgain.grid.kernal.ggfs.hadoop.GridGgfsHadoopUtils.java Source code

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Here is the source code for org.gridgain.grid.kernal.ggfs.hadoop.GridGgfsHadoopUtils.java

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/* 
 Copyright (C) GridGain Systems. All Rights Reserved.
     
 Licensed 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.gridgain.grid.kernal.ggfs.hadoop;

import org.apache.hadoop.conf.*;
import org.apache.hadoop.fs.*;
import org.gridgain.grid.*;
import org.gridgain.grid.ggfs.*;
import org.gridgain.grid.kernal.processors.ggfs.*;
import org.jetbrains.annotations.*;

import java.io.*;

/**
 * Utility constants and methods for GGFS Hadoop file system.
 */
public class GridGgfsHadoopUtils {
    /** Parameter name for endpoint no embed mode flag. */
    public static final String PARAM_GGFS_ENDPOINT_NO_EMBED = "fs.ggfs.%s.endpoint.no_embed";

    /** Parameter name for endpoint no shared memory flag. */
    public static final String PARAM_GGFS_ENDPOINT_NO_LOCAL_SHMEM = "fs.ggfs.%s.endpoint.no_local_shmem";

    /** Parameter name for endpoint no local TCP flag. */
    public static final String PARAM_GGFS_ENDPOINT_NO_LOCAL_TCP = "fs.ggfs.%s.endpoint.no_local_tcp";

    /**
     * Get string parameter.
     *
     * @param cfg Configuration.
     * @param name Parameter name.
     * @param authority Authority.
     * @param dflt Default value.
     * @return String value.
     */
    public static String parameter(Configuration cfg, String name, String authority, String dflt) {
        return cfg.get(String.format(name, authority != null ? authority : ""), dflt);
    }

    /**
     * Get integer parameter.
     *
     * @param cfg Configuration.
     * @param name Parameter name.
     * @param authority Authority.
     * @param dflt Default value.
     * @return Integer value.
     * @throws IOException In case of parse exception.
     */
    public static int parameter(Configuration cfg, String name, String authority, int dflt) throws IOException {
        String name0 = String.format(name, authority != null ? authority : "");

        try {
            return cfg.getInt(name0, dflt);
        } catch (NumberFormatException ignore) {
            throw new IOException("Failed to parse parameter value to integer: " + name0);
        }
    }

    /**
     * Get boolean parameter.
     *
     * @param cfg Configuration.
     * @param name Parameter name.
     * @param authority Authority.
     * @param dflt Default value.
     * @return Boolean value.
     */
    public static boolean parameter(Configuration cfg, String name, String authority, boolean dflt) {
        return cfg.getBoolean(String.format(name, authority != null ? authority : ""), dflt);
    }

    /**
     * Cast GG exception to appropriate IO exception.
     *
     * @param e Exception to cast.
     * @return Casted exception.
     */
    public static IOException cast(GridException e) {
        return cast(e, null);
    }

    /**
     * Cast GG exception to appropriate IO exception.
     *
     * @param e Exception to cast.
     * @param path Path for exceptions.
     * @return Casted exception.
     */
    @SuppressWarnings("unchecked")
    public static IOException cast(GridException e, @Nullable String path) {
        assert e != null;

        // First check for any nested IOException; if exists - re-throw it.
        if (e.hasCause(IOException.class))
            return e.getCause(IOException.class);
        else if (e instanceof GridGgfsFileNotFoundException)
            return new FileNotFoundException(path); // TODO: Or PathNotFoundException?
        else if (e instanceof GridGgfsParentNotDirectoryException)
            return new ParentNotDirectoryException(path);
        else if (path != null && e instanceof GridGgfsDirectoryNotEmptyException)
            return new PathIsNotEmptyDirectoryException(path);
        else if (path != null && e instanceof GridGgfsPathAlreadyExistsException)
            return new PathExistsException(path);
        else
            return new IOException(e);
    }

    /**
     * Constructor.
     */
    private GridGgfsHadoopUtils() {
        // No-op.
    }
}