Madan Jampani | 1416d2e | 2014-11-04 18:11:51 -0800 | [diff] [blame] | 1 | package org.onlab.onos.store.service; |
| 2 | |
| 3 | import java.util.Arrays; |
| 4 | |
Yuta HIGUCHI | 75fb1f4 | 2014-11-19 13:56:19 -0800 | [diff] [blame] | 5 | import org.onlab.util.ByteArraySizeHashPrinter; |
| 6 | |
Yuta HIGUCHI | 5e1cfe0 | 2014-11-04 21:22:45 -0800 | [diff] [blame] | 7 | import com.google.common.base.MoreObjects; |
| 8 | |
Madan Jampani | 1416d2e | 2014-11-04 18:11:51 -0800 | [diff] [blame] | 9 | /** |
| 10 | * Wrapper object that holds the object (as byte array) and its version. |
| 11 | */ |
| 12 | public class VersionedValue { |
| 13 | |
| 14 | private final byte[] value; |
| 15 | private final long version; |
| 16 | |
| 17 | /** |
| 18 | * Creates a new instance with the specified value and version. |
Madan Jampani | 9b19a82 | 2014-11-04 21:37:13 -0800 | [diff] [blame] | 19 | * @param value value |
| 20 | * @param version version |
Madan Jampani | 1416d2e | 2014-11-04 18:11:51 -0800 | [diff] [blame] | 21 | */ |
| 22 | public VersionedValue(byte[] value, long version) { |
| 23 | this.value = value; |
| 24 | this.version = version; |
| 25 | } |
| 26 | |
| 27 | /** |
| 28 | * Returns the value. |
| 29 | * @return value. |
| 30 | */ |
| 31 | public byte[] value() { |
| 32 | return value; |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Returns the version. |
| 37 | * @return version. |
| 38 | */ |
| 39 | public long version() { |
| 40 | return version; |
| 41 | } |
| 42 | |
Yuta HIGUCHI | 3bd8cdc | 2014-11-05 19:11:44 -0800 | [diff] [blame] | 43 | /** |
| 44 | * Creates a copy of given VersionedValue. |
| 45 | * |
| 46 | * @param original VersionedValue to create a copy |
| 47 | * @return same as original if original or it's value is null, |
| 48 | * otherwise creates a copy. |
| 49 | */ |
| 50 | public static VersionedValue copy(VersionedValue original) { |
| 51 | if (original == null) { |
| 52 | return null; |
| 53 | } |
| 54 | if (original.value == null) { |
| 55 | // immutable, no need to copy |
| 56 | return original; |
| 57 | } else { |
| 58 | return new VersionedValue( |
| 59 | Arrays.copyOf(original.value, |
| 60 | original.value.length), |
| 61 | original.version); |
| 62 | } |
| 63 | } |
| 64 | |
Madan Jampani | 1416d2e | 2014-11-04 18:11:51 -0800 | [diff] [blame] | 65 | @Override |
| 66 | public String toString() { |
Yuta HIGUCHI | 5e1cfe0 | 2014-11-04 21:22:45 -0800 | [diff] [blame] | 67 | return MoreObjects.toStringHelper(getClass()) |
| 68 | .add("version", version) |
Yuta HIGUCHI | 75fb1f4 | 2014-11-19 13:56:19 -0800 | [diff] [blame] | 69 | .add("value", ByteArraySizeHashPrinter.orNull(value)) |
Yuta HIGUCHI | 5e1cfe0 | 2014-11-04 21:22:45 -0800 | [diff] [blame] | 70 | .toString(); |
Madan Jampani | 1416d2e | 2014-11-04 18:11:51 -0800 | [diff] [blame] | 71 | } |
| 72 | } |