1/* 2 * Copyright 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package androidx.work; 18 19import android.support.annotation.NonNull; 20 21import java.util.HashMap; 22import java.util.List; 23import java.util.Map; 24 25/** 26 * An {@link InputMerger} that attempts to add all keys from all inputs to the output. In case of a 27 * conflict, this class will overwrite the previously-set key. Because there is no defined order 28 * for inputs, this implementation is best suited for cases where conflicts will not happen, or 29 * where overwriting is a valid strategy to deal with them. 30 */ 31 32public final class OverwritingInputMerger extends InputMerger { 33 34 @Override 35 public @NonNull Data merge(@NonNull List<Data> inputs) { 36 Data.Builder output = new Data.Builder(); 37 Map<String, Object> mergedValues = new HashMap<>(); 38 39 for (Data input : inputs) { 40 mergedValues.putAll(input.getKeyValueMap()); 41 } 42 43 output.putAll(mergedValues); 44 return output.build(); 45 } 46} 47