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| <h2 title="Interface INativeComparable" class="title">Interface INativeComparable</h2> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public interface <span class="typeNameLabel">INativeComparable</span></pre> |
| <div class="block">Any key type that is comparable at native side must implement this interface. |
| |
| A native comparator function should have the ComparatorPtr type: |
| <code> |
| typedef int (*ComparatorPtr)(const char * src, uint32_t srcLength, |
| const char * dest, uint32_t destLength); |
| </code> |
| Keys are in serialized format at native side. The function has passed in |
| the keys' locations and lengths such that we can compare them in the same |
| logic as their Java comparator. |
| |
| For example, a HiveKey serialized as an int field (containing the length of |
| raw bytes) + raw bytes. |
| When comparing two HiveKeys, we first read the length field and then |
| compare the raw bytes by invoking the BytesComparator provided by our library. |
| We pass the location and length of raw bytes into BytesComparator. |
| |
| <code> |
| int HivePlatform::HiveKeyComparator(const char * src, uint32_t srcLength, |
| const char * dest, uint32_t destLength) { |
| uint32_t sl = bswap(*(uint32_t*)src); |
| uint32_t dl = bswap(*(uint32_t*)dest); |
| return NativeObjectFactory::BytesComparator(src + 4, sl, dest + 4, dl); |
| } |
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