org.apache.hadoop.hdfs.protocol.datatransfer.Op.java Source code

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Here is the source code for org.apache.hadoop.hdfs.protocol.datatransfer.Op.java

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/**
 * 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.hdfs.protocol.datatransfer;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/** Operation */
@InterfaceAudience.Private
@InterfaceStability.Evolving
public enum Op {
    WRITE_BLOCK((byte) 80), READ_BLOCK((byte) 81), READ_METADATA((byte) 82), REPLACE_BLOCK((byte) 83), COPY_BLOCK(
            (byte) 84), BLOCK_CHECKSUM((byte) 85), TRANSFER_BLOCK((byte) 86), REQUEST_SHORT_CIRCUIT_FDS(
                    (byte) 87), RELEASE_SHORT_CIRCUIT_FDS((byte) 88), REQUEST_SHORT_CIRCUIT_SHM(
                            (byte) 89), BLOCK_GROUP_CHECKSUM((byte) 90), CUSTOM((byte) 127);

    /** The code for this operation. */
    public final byte code;

    Op(byte code) {
        this.code = code;
    }

    private static final int FIRST_CODE = values()[0].code;

    /** Return the object represented by the code. */
    private static Op valueOf(byte code) {
        final int i = (code & 0xff) - FIRST_CODE;
        return i < 0 || i >= values().length ? null : values()[i];
    }

    /** Read from in */
    public static Op read(DataInput in) throws IOException {
        return valueOf(in.readByte());
    }

    /** Write to out */
    public void write(DataOutput out) throws IOException {
        out.write(code);
    }
}