Add SearchTargetEventHelper to SearchUiLib

/*

 * Copyright (C) 2023 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.app.search;

import static com.android.app.search.SearchTargetExtras.isRichAnswer;

import android.app.search.SearchTarget;

import android.content.ComponentName;

import android.os.Process;

import androidx.annotation.Nullable;

/**

 * Helper class that defines helper methods for {@link android.app.search.SearchTargetEvent} to

 * define the contract between Launcher and AiAi for notifyEvent.

 */

public class SearchTargetEventHelper {

    /**

     * Generate web target id similar to AiAi targetId for logging both 0-state and n-state.

     * AiAi target id is of format "resultType:userId:packageName:extraInfo"

     *

     * @return string webTargetId

     * Example webTargetId for

     * web suggestion - WEB_SUGGEST:0:com.google.android.googlequicksearchbox:SUGGESTION

     * rich answer - WEB_SUGGEST:0:com.google.android.googlequicksearchbox:RICH_ANSWER

     */

    public static String generateWebTargetIdForLogging(SearchTarget webTarget) {

        StringBuilder webTargetId = new StringBuilder(

                "WEB_SUGGEST" + ":" + Process.myUserHandle().getIdentifier() + ":"

                        + webTarget.getPackageName());

        if (isRichAnswer(webTarget)) {

            webTargetId.append(":RICH_ANSWER");

        } else {

            webTargetId.append(":SUGGESTION");

        }

        return webTargetId.toString();

    }

    /**

     * Generate application target id similar to AiAi targetId for logging only 0-state.

     * For n-state, AiAi already populates the target id in right format.

     * AiAi target id is of format "resultType:userId:packageName:extraInfo"

     *

     * When the apps from AiAi's AppPredictionService are converted to {@link SearchTarget}, we need

     * to construct the targetId using componentName.

     *

     * @return string appTargetId

     * Example appTargetId for

     * maps - APPLICATION:0:com.google.android.apps.maps:com.google.android.maps.MapsActivity

     * clock - APPLICATION:0:com.google.android.deskclock:com.android.deskclock.DeskClock

     */

    public static String generateAppTargetIdForLogging(@Nullable ComponentName appComponentName) {

        StringBuilder appTargetId = new StringBuilder(

                "APPLICATION" + ":" + Process.myUserHandle().getIdentifier() + ":");

        if (appComponentName == null) return appTargetId.append(" : ").toString();

        return appTargetId + appComponentName.getPackageName() + ":"

                + appComponentName.getClassName();

    }

}