| /* |
| * 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.IntRange; |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.os.LocaleList; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| import android.util.ArrayMap; |
| import android.view.textclassifier.TextClassifier.EntityType; |
| |
| import com.android.internal.util.Preconditions; |
| |
| import java.util.Locale; |
| import java.util.Map; |
| |
| /** |
| * Information about where text selection should be. |
| */ |
| public final class TextSelection { |
| |
| private final int mStartIndex; |
| private final int mEndIndex; |
| @NonNull private final EntityConfidence mEntityConfidence; |
| @NonNull private final String mSignature; |
| |
| private TextSelection( |
| int startIndex, int endIndex, @NonNull Map<String, Float> entityConfidence, |
| @NonNull String signature) { |
| mStartIndex = startIndex; |
| mEndIndex = endIndex; |
| mEntityConfidence = new EntityConfidence(entityConfidence); |
| mSignature = signature; |
| } |
| |
| /** |
| * Returns the start index of the text selection. |
| */ |
| public int getSelectionStartIndex() { |
| return mStartIndex; |
| } |
| |
| /** |
| * Returns the end index of the text selection. |
| */ |
| public int getSelectionEndIndex() { |
| return mEndIndex; |
| } |
| |
| /** |
| * Returns the number of entities found in the classified text. |
| */ |
| @IntRange(from = 0) |
| public int getEntityCount() { |
| return mEntityConfidence.getEntities().size(); |
| } |
| |
| /** |
| * Returns the entity at the specified index. Entities are ordered from high confidence |
| * to low confidence. |
| * |
| * @throws IndexOutOfBoundsException if the specified index is out of range. |
| * @see #getEntityCount() for the number of entities available. |
| */ |
| @NonNull |
| public @EntityType String getEntity(int index) { |
| return mEntityConfidence.getEntities().get(index); |
| } |
| |
| /** |
| * 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(@EntityType String entity) { |
| return mEntityConfidence.getConfidenceScore(entity); |
| } |
| |
| /** |
| * Returns the signature for this object. |
| * The TextClassifier that generates this object may use it as a way to internally identify |
| * this object. |
| */ |
| @NonNull |
| public String getSignature() { |
| return mSignature; |
| } |
| |
| @Override |
| public String toString() { |
| return String.format( |
| Locale.US, |
| "TextSelection {startIndex=%d, endIndex=%d, entities=%s, signature=%s}", |
| mStartIndex, mEndIndex, mEntityConfidence, mSignature); |
| } |
| |
| /** Helper for parceling via #ParcelableWrapper. */ |
| private void writeToParcel(Parcel dest, int flags) { |
| dest.writeInt(mStartIndex); |
| dest.writeInt(mEndIndex); |
| mEntityConfidence.writeToParcel(dest, flags); |
| dest.writeString(mSignature); |
| } |
| |
| /** Helper for unparceling via #ParcelableWrapper. */ |
| private TextSelection(Parcel in) { |
| mStartIndex = in.readInt(); |
| mEndIndex = in.readInt(); |
| mEntityConfidence = EntityConfidence.CREATOR.createFromParcel(in); |
| mSignature = in.readString(); |
| } |
| |
| /** |
| * Builder used to build {@link TextSelection} objects. |
| */ |
| public static final class Builder { |
| |
| private final int mStartIndex; |
| private final int mEndIndex; |
| @NonNull private final Map<String, Float> mEntityConfidence = new ArrayMap<>(); |
| @NonNull private String mSignature = ""; |
| |
| /** |
| * Creates a builder used to build {@link TextSelection} objects. |
| * |
| * @param startIndex the start index of the text selection. |
| * @param endIndex the end index of the text selection. Must be greater than startIndex |
| */ |
| public Builder(@IntRange(from = 0) int startIndex, @IntRange(from = 0) int endIndex) { |
| Preconditions.checkArgument(startIndex >= 0); |
| Preconditions.checkArgument(endIndex > startIndex); |
| mStartIndex = startIndex; |
| mEndIndex = endIndex; |
| } |
| |
| /** |
| * 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 Builder setEntityType( |
| @NonNull @EntityType String type, |
| @FloatRange(from = 0.0, to = 1.0) float confidenceScore) { |
| mEntityConfidence.put(type, confidenceScore); |
| return this; |
| } |
| |
| /** |
| * Sets a signature for the TextSelection object. |
| * |
| * The TextClassifier that generates the TextSelection object may use it as a way to |
| * internally identify the TextSelection object. |
| */ |
| public Builder setSignature(@NonNull String signature) { |
| mSignature = Preconditions.checkNotNull(signature); |
| return this; |
| } |
| |
| /** |
| * Builds and returns {@link TextSelection} object. |
| */ |
| public TextSelection build() { |
| return new TextSelection( |
| mStartIndex, mEndIndex, mEntityConfidence, mSignature); |
| } |
| } |
| |
| /** |
| * Optional input parameters for generating TextSelection. |
| */ |
| public static final class Options implements Parcelable { |
| |
| private @Nullable LocaleList mDefaultLocales; |
| private boolean mDarkLaunchAllowed; |
| |
| public Options() {} |
| |
| /** |
| * @param defaultLocales ordered list of locale preferences that may be used to disambiguate |
| * the provided text. If no locale preferences exist, set this to null or an empty |
| * locale list. |
| */ |
| public Options setDefaultLocales(@Nullable LocaleList defaultLocales) { |
| mDefaultLocales = defaultLocales; |
| return this; |
| } |
| |
| /** |
| * @return ordered list of locale preferences that can be used to disambiguate |
| * the provided text. |
| */ |
| @Nullable |
| public LocaleList getDefaultLocales() { |
| return mDefaultLocales; |
| } |
| |
| /** |
| * @param allowed whether or not the TextClassifier should return selection suggestions |
| * when "dark launched". When a TextClassifier is dark launched, it can suggest |
| * selection changes that should not be used to actually change the user's selection. |
| * Instead, the suggested selection is logged, compared with the user's selection |
| * interaction, and used to generate quality metrics for the TextClassifier. |
| * |
| * @hide |
| */ |
| public void setDarkLaunchAllowed(boolean allowed) { |
| mDarkLaunchAllowed = allowed; |
| } |
| |
| /** |
| * Returns true if the TextClassifier should return selection suggestions when |
| * "dark launched". Otherwise, returns false. |
| * |
| * @hide |
| */ |
| public boolean isDarkLaunchAllowed() { |
| return mDarkLaunchAllowed; |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| dest.writeInt(mDefaultLocales != null ? 1 : 0); |
| if (mDefaultLocales != null) { |
| mDefaultLocales.writeToParcel(dest, flags); |
| } |
| dest.writeInt(mDarkLaunchAllowed ? 1 : 0); |
| } |
| |
| public static final Parcelable.Creator<Options> CREATOR = |
| new Parcelable.Creator<Options>() { |
| @Override |
| public Options createFromParcel(Parcel in) { |
| return new Options(in); |
| } |
| |
| @Override |
| public Options[] newArray(int size) { |
| return new Options[size]; |
| } |
| }; |
| |
| private Options(Parcel in) { |
| if (in.readInt() > 0) { |
| mDefaultLocales = LocaleList.CREATOR.createFromParcel(in); |
| } |
| mDarkLaunchAllowed = in.readInt() != 0; |
| } |
| } |
| |
| /** |
| * Parcelable wrapper for TextSelection objects. |
| * @hide |
| */ |
| public static final class ParcelableWrapper implements Parcelable { |
| |
| @NonNull private TextSelection mTextSelection; |
| |
| public ParcelableWrapper(@NonNull TextSelection textSelection) { |
| Preconditions.checkNotNull(textSelection); |
| mTextSelection = textSelection; |
| } |
| |
| @NonNull |
| public TextSelection getTextSelection() { |
| return mTextSelection; |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| mTextSelection.writeToParcel(dest, flags); |
| } |
| |
| public static final Parcelable.Creator<ParcelableWrapper> CREATOR = |
| new Parcelable.Creator<ParcelableWrapper>() { |
| @Override |
| public ParcelableWrapper createFromParcel(Parcel in) { |
| return new ParcelableWrapper(new TextSelection(in)); |
| } |
| |
| @Override |
| public ParcelableWrapper[] newArray(int size) { |
| return new ParcelableWrapper[size]; |
| } |
| }; |
| |
| } |
| } |