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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 com.android.internal.util.Preconditions;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
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 Map<T, Float> mEntityConfidence = new HashMap<>();
private final Comparator<T> mEntityComparator = (e1, e2) -> {
float score1 = mEntityConfidence.get(e1);
float score2 = mEntityConfidence.get(e2);
if (score1 > score2) {
return -1;
}
if (score1 < score2) {
return 1;
}
return 0;
};
EntityConfidence() {}
EntityConfidence(@NonNull EntityConfidence<T> source) {
Preconditions.checkNotNull(source);
mEntityConfidence.putAll(source.mEntityConfidence);
}
/**
* Sets an entity type for the classified text and assigns a confidence score.
*
* @param confidenceScore a value from 0 (low confidence) to 1 (high confidence).
* 0 implies the entity does not exist for the classified text.
* Values greater than 1 are clamped to 1.
*/
public void setEntityType(
@NonNull T type, @FloatRange(from = 0.0, to = 1.0) float confidenceScore) {
Preconditions.checkNotNull(type);
if (confidenceScore > 0) {
mEntityConfidence.put(type, Math.min(1, confidenceScore));
} else {
mEntityConfidence.remove(type);
}
}
/**
* Returns an immutable list of entities found in the classified text ordered from
* high confidence to low confidence.
*/
@NonNull
public List<T> getEntities() {
List<T> entities = new ArrayList<>(mEntityConfidence.size());
entities.addAll(mEntityConfidence.keySet());
entities.sort(mEntityComparator);
return Collections.unmodifiableList(entities);
}
/**
* 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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