paging/runtime/src/androidTest/java/android/arch/paging/StringPagedList.java

/*
 * 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.arch.paging;

import android.support.annotation.NonNull;
import android.support.v7.recyclerview.extensions.DiffCallback;

import java.util.Arrays;

public class StringPagedList extends NullPaddedList<String> {
    public StringPagedList(int leadingNulls, int trailingNulls, String... items) {
        super(leadingNulls, Arrays.asList(items), trailingNulls);
    }

    public static final DiffCallback<String> DIFF_CALLBACK = new DiffCallback<String>() {
        @Override
        public boolean areItemsTheSame(@NonNull String oldItem, @NonNull String newItem) {
            // first char means same item
            return oldItem.charAt(0) == newItem.charAt(0);
        }

        @Override
        public boolean areContentsTheSame(@NonNull String oldItem, @NonNull String newItem) {
            return oldItem.equals(newItem);
        }
    };
}