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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.grouping.vespa;
import java.util.Arrays;
/**
* Immutable
*
* @author Simon Thoresen Hult
*/
class ResultId {
private final int[] indexes;
private final int hashCode;
private ResultId(int[] indexes) {
this.indexes = indexes;
this.hashCode = Arrays.hashCode(indexes);
}
public boolean startsWith(int... prefix) {
if (prefix.length > indexes.length) {
return false;
}
for (int i = 0; i < prefix.length; ++i) {
if (prefix[i] != indexes[i]) {
return false;
}
}
return true;
}
public ResultId newChildId(int childIdx) {
int[] arr = Arrays.copyOf(indexes, indexes.length + 1);
arr[indexes.length] = childIdx;
return new ResultId(arr);
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public boolean equals(Object obj) {
return obj instanceof ResultId && Arrays.equals(indexes, ((ResultId)obj).indexes);
}
@Override
public String toString() {
return Arrays.toString(indexes);
}
public void encode(IntegerEncoder out) {
out.append(indexes.length);
for (int i : indexes) {
out.append(i);
}
}
public static ResultId decode(IntegerDecoder in) {
int len = in.next();
int[] arr = new int[len];
for (int i = 0; i < len; ++i) {
arr[i] = in.next();
}
return new ResultId(arr);
}
public static ResultId valueOf(int... indexes) {
return new ResultId(Arrays.copyOf(indexes, indexes.length));
}
}
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