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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.fastsearch;
import java.util.Arrays;
import com.yahoo.collections.BobHash;
import com.yahoo.fs4.QueryPacket;
/**
* The key used in the packet cache.
*
* @author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
*/
public class CacheKey {
private int hashCode;
private byte[] serialized = null;
/**
* Create a cache key from the query packet.
*/
public CacheKey(QueryPacket queryPacket) {
if (!queryPacket.isEncoded()) {
queryPacket.allocateAndEncode(0);
}
this.serialized = queryPacket.getOpaqueCacheKey();
hashCode = calculateHashCode();
}
private int calculateHashCode() {
return BobHash.hash(serialized, 0);
}
public boolean equals(Object o) {
if (o == null) {
return false;
}
if (!(o instanceof CacheKey)) {
return false;
}
CacheKey k = (CacheKey) o;
return Arrays.equals(serialized, k.serialized);
// // The following is used for detailed debugging
// boolean state = true;
// if (serialized.length != k.serialized.length) {
// System.out.println("this " + serialized.length + " other " + k.serialized.length);
// return false;
// }
// System.out.println("start of arrays");
// for (int i = 0; i < serialized.length; ++i) {
// System.out.print("serialized " + serialized[i] + " " + k.serialized[i]);
// if (serialized[i] != k.serialized[i]) {
// System.out.println(" diff at index " + i);
// state = false; // want to see all the data
// } else {
// System.out.println("");
// }
// }
// return state;
}
public int hashCode() {
return hashCode;
}
public byte[] getCopyOfFullKey() {
return Arrays.copyOf(serialized, serialized.length);
}
/**
* Return an estimate of the memory used by this object. Ie the sum of
* the internal data fields.
*/
public int byteSize() {
// 4 = sizeOf(hashCode)
return serialized.length + 4;
}
}
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