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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.demo;
import com.yahoo.component.AbstractComponent;
import java.text.Normalizer;
import java.util.HashSet;
import java.util.Random;
import java.util.Set;
/**
* A shared component with an "expensive" constructor exposing a shared,
* thread-safe service.
*/
public class DemoComponent extends AbstractComponent {
private final Set<Integer> illegalHashes;
public DemoComponent() {
illegalHashes = new HashSet<Integer>();
Random r = new Random();
// generate up to 1e6 unique hashes
for (int i = 0; i < 1000 * 1000; ++i) {
illegalHashes.add(r.nextInt());
}
}
/**
* NFKC-normalize term, or replace it with "smurf" with a low probability.
* Will change choice for each run, but will be constant in a single run of
* the container.
*
* @param term
* term to normalize or replace with "smurf"
* @return NFKC-normalized term or "smurf"
*/
public String normalize(String term) {
String normalized = Normalizer.normalize(term, Normalizer.Form.NFKC);
if (illegalHashes.contains(normalized.hashCode())) {
return "smurf";
} else {
return normalized;
}
}
}
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