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/*
* Copyright (C) 2017 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 android.view.textclassifier;
import android.annotation.FloatRange;
import android.annotation.NonNull;
import android.util.ArrayMap;
import com.android.internal.util.Preconditions;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
/**
* Helper object for setting and getting entity scores for classified text.
*
* @param <T> the entity type.
* @hide
*/
final class EntityConfidence<T> {
private final ArrayMap<T, Float> mEntityConfidence = new ArrayMap<>();
private final ArrayList<T> mSortedEntities = new ArrayList<>();
EntityConfidence() {}
EntityConfidence(@NonNull EntityConfidence<T> source) {
Preconditions.checkNotNull(source);
mEntityConfidence.putAll(source.mEntityConfidence);
mSortedEntities.addAll(source.mSortedEntities);
}
/**
* Constructs an EntityConfidence from a map of entity to confidence.
*
* Map entries that have 0 confidence are removed, and values greater than 1 are clamped to 1.
*
* @param source a map from entity to a confidence value in the range 0 (low confidence) to
* 1 (high confidence).
*/
EntityConfidence(@NonNull Map<T, Float> source) {
Preconditions.checkNotNull(source);
// Prune non-existent entities and clamp to 1.
mEntityConfidence.ensureCapacity(source.size());
for (Map.Entry<T, Float> it : source.entrySet()) {
if (it.getValue() <= 0) continue;
mEntityConfidence.put(it.getKey(), Math.min(1, it.getValue()));
}
// Create a list of entities sorted by decreasing confidence for getEntities().
mSortedEntities.ensureCapacity(mEntityConfidence.size());
mSortedEntities.addAll(mEntityConfidence.keySet());
mSortedEntities.sort((e1, e2) -> {
float score1 = mEntityConfidence.get(e1);
float score2 = mEntityConfidence.get(e2);
return Float.compare(score2, score1);
});
}
/**
* Returns an immutable list of entities found in the classified text ordered from
* high confidence to low confidence.
*/
@NonNull
public List<T> getEntities() {
return Collections.unmodifiableList(mSortedEntities);
}
/**
* Returns the confidence score for the specified entity. The value ranges from
* 0 (low confidence) to 1 (high confidence). 0 indicates that the entity was not found for the
* classified text.
*/
@FloatRange(from = 0.0, to = 1.0)
public float getConfidenceScore(T entity) {
if (mEntityConfidence.containsKey(entity)) {
return mEntityConfidence.get(entity);
}
return 0;
}
@Override
public String toString() {
return mEntityConfidence.toString();
}
}
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