org.apache.hadoop.fs.FileChecksum.java Source code

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Here is the source code for org.apache.hadoop.fs.FileChecksum.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.fs;

import java.util.Arrays;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.Options.ChecksumOpt;
import org.apache.hadoop.io.Writable;

/** An abstract class representing file checksums for files. */
@InterfaceAudience.Public
@InterfaceStability.Stable
public abstract class FileChecksum implements Writable {
    /** The checksum algorithm name */
    public abstract String getAlgorithmName();

    /** The length of the checksum in bytes */
    public abstract int getLength();

    /** The value of the checksum in bytes */
    public abstract byte[] getBytes();

    public ChecksumOpt getChecksumOpt() {
        return null;
    }

    /** Return true if both the algorithms and the values are the same. */
    @Override
    public boolean equals(Object other) {
        if (other == this) {
            return true;
        }
        if (other == null || !(other instanceof FileChecksum)) {
            return false;
        }

        final FileChecksum that = (FileChecksum) other;
        return this.getAlgorithmName().equals(that.getAlgorithmName())
                && Arrays.equals(this.getBytes(), that.getBytes());
    }

    @Override
    public int hashCode() {
        return getAlgorithmName().hashCode() ^ Arrays.hashCode(getBytes());
    }
}