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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.adservices.service.measurement.util;
import com.android.adservices.service.measurement.aggregation.AggregateFilterData;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/** Filtering utilities for measurement. */
public final class Filter {
private Filter() { }
/**
* Checks whether source filter and trigger filter are matched. When a key is only present in
* source or trigger, ignore that key. When a key is present both in source and trigger, the key
* matches if the intersection of values is not empty.
*
* @param sourceFilter the filter_data field in attribution source.
* @param triggerFilter the AttributionTriggerData in attribution trigger.
* @param isFilter true for filters, false for not_filters.
* @return return true when all keys in source filter and trigger filter are matched.
*/
public static boolean isFilterMatch(
AggregateFilterData sourceFilter, AggregateFilterData triggerFilter, boolean isFilter) {
for (String key : triggerFilter.getAttributionFilterMap().keySet()) {
if (!sourceFilter.getAttributionFilterMap().containsKey(key)) {
continue;
}
// Finds the intersection of two value lists.
List<String> sourceValues = sourceFilter.getAttributionFilterMap().get(key);
List<String> triggerValues = triggerFilter.getAttributionFilterMap().get(key);
Set<String> common = new HashSet<>(sourceValues);
common.retainAll(triggerValues);
// For filters, return false when one key doesn't have intersection.
if (isFilter && common.size() == 0) {
return false;
}
// For not_filters, return false when one key has intersection.
if (!isFilter && common.size() != 0) {
return false;
}
}
return true;
}
}
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