com.linkedin.databus2.schemas.SchemaId.java Source code

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Here is the source code for com.linkedin.databus2.schemas.SchemaId.java

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package com.linkedin.databus2.schemas;
/*
 *
 * Copyright 2013 LinkedIn Corp. 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.
 *
*/

import java.util.Arrays;

import org.apache.avro.Schema;
import org.apache.commons.codec.binary.Hex;

import com.linkedin.databus.core.DbusEvent;
import com.linkedin.databus2.schemas.utils.Utils;

/**
 * This class contains a byte-array that is used as a unique identifier for an Avro schema.
 * The byte array is of size 16 (if we use MD5 hash) or 4 (if we use CRC32).
 *
 * "Borrowed"  largely from com.linkedin.avro.SchemaId
 */
public class SchemaId {
    private final byte[] _idBytes;

    public SchemaId(byte[] newIdBytes) {
        super();
        Utils.notNull(newIdBytes);
        // As of now, we support either MD5 or CRC32.
        //restrict byte sequences to either handle 128 bits or 32 bits
        if ((newIdBytes.length != DbusEvent.MD5_DIGEST_LEN) && (newIdBytes.length != DbusEvent.CRC32_DIGEST_LEN)) {
            throw new IllegalArgumentException("schema id is of length is " + newIdBytes.length
                    + " Expected length: " + DbusEvent.CRC32_DIGEST_LEN + " or " + DbusEvent.MD5_DIGEST_LEN);
        }
        _idBytes = newIdBytes.clone();
    }

    /**
     * Create a schema ID with an MD5  for a given Avro schema.
     */
    public static SchemaId createWithMd5(Schema schema) {
        return new SchemaId(Utils.md5(Utils.utf8(schema.toString(false))));
    }

    public static SchemaId createWithMd5(String schema) {
        return createWithMd5(Schema.parse(schema));
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof SchemaId))
            return false;
        if (this == obj)
            return true; //shortcut
        SchemaId id = (SchemaId) obj;
        return Arrays.equals(_idBytes, id._idBytes);
    }

    @Override
    public int hashCode() {
        return Arrays.hashCode(_idBytes);
    }

    @Override
    public String toString() {
        return Hex.encodeHexString(_idBytes);
    }

    public byte[] getByteArray() {
        return _idBytes;
    }
}