info.gehrels.flockDBClient.ByteHelper.java Source code

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Here is the source code for info.gehrels.flockDBClient.ByteHelper.java

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/*
 * Copyright 2012 Benjamin Gehrels
 *
 * 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 info.gehrels.flockDBClient;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.LongBuffer;

import static org.apache.commons.lang.ArrayUtils.isNotEmpty;

final class ByteHelper {
    static ByteBuffer asByteBufferOrNull(long... destinationIds) {
        ByteBuffer buf = null;
        if (isNotEmpty(destinationIds)) {
            buf = ByteBuffer.wrap(new byte[destinationIds.length * (Long.SIZE / 8)]);
            buf.order(ByteOrder.LITTLE_ENDIAN);
            for (long destinationId : destinationIds) {
                buf.putLong(destinationId);
            }
            buf.rewind();
        }
        return buf;
    }

    static ByteBuffer asByteBuffer(long... destinationIds) {
        ByteBuffer buf = null;
        buf = ByteBuffer.wrap(new byte[destinationIds.length * (Long.SIZE / 8)]);
        buf.order(ByteOrder.LITTLE_ENDIAN);
        for (long destinationId : destinationIds) {
            buf.putLong(destinationId);
        }
        buf.rewind();
        return buf;
    }

    static long[] toLongArray(byte[] ids) {
        LongBuffer buffy = ByteBuffer.wrap(ids).order(ByteOrder.LITTLE_ENDIAN).asLongBuffer();
        long[] result = new long[buffy.capacity()];

        int i = 0;
        while (buffy.hasRemaining()) {
            result[i++] = buffy.get();
        }

        return result;
    }
}