android-34/com/android/systemui/statusbar/notification/collection/listbuilder/pluggable/NotifSectioner.java

/*
 * Copyright (C) 2020 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.systemui.statusbar.notification.collection.listbuilder.pluggable;

import android.annotation.Nullable;

import com.android.systemui.statusbar.notification.collection.ListEntry;
import com.android.systemui.statusbar.notification.collection.ShadeListBuilder;
import com.android.systemui.statusbar.notification.collection.render.NodeController;
import com.android.systemui.statusbar.notification.collection.render.NodeSpec;
import com.android.systemui.statusbar.notification.stack.PriorityBucket;

import java.util.List;

/**
 * Pluggable for participating in notif sectioning. See {@link ShadeListBuilder#setSectioners}.
 */
public abstract class NotifSectioner extends Pluggable<NotifSectioner> {
    @PriorityBucket
    private final int mBucket;

    protected NotifSectioner(String name, @PriorityBucket int bucket) {
        super(name);
        mBucket = bucket;
    }

    /**
     * @return the "bucket" value to apply to entries in this section
     */
    @PriorityBucket
    public final int getBucket() {
        return mBucket;
    }

    /**
     * If returns true, this notification is considered within this section.
     * Sectioning is performed on each top level notification each time the pipeline is run.
     * However, this doesn't necessarily mean that your section will get called on each top-level
     * notification. The first section to return true determines the section of the notification.
     */
    public abstract boolean isInSection(ListEntry entry);

    /**
     * Returns an optional {@link NotifComparator} to sort entries only in this section.
     * {@link ListEntry} instances passed to this comparator are guaranteed to have this section,
     * and this ordering will take precedence over any global comparators supplied to {@link
     * com.android.systemui.statusbar.notification.collection.NotifPipeline#setComparators(List)}.
     *
     * NOTE: this method is only called once when the Sectioner is attached.
     */
    public @Nullable NotifComparator getComparator() {
        return null;
    }

    /**
     * Returns an optional {@link NodeSpec} for the section header. If {@code null}, no header will
     * be used for the section.
     *
     * NOTE: this method is only called once when the Sectioner is attached.
     */
    public @Nullable NodeController getHeaderNodeController() {
        return null;
    }

    /**
     * Notify of children of this section being updated
     * @param entries of this section that are borrowed (must clone to store)
     */
    public void onEntriesUpdated(List<ListEntry> entries) {}
}