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