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/*
* 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 com.android.systemui.keyguard;
import androidx.annotation.NonNull;
import java.util.ArrayList;
import java.util.Objects;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
/**
* Base class for lifecycles with observers.
*/
public class Lifecycle<T> {
private ArrayList<T> mObservers = new ArrayList<>();
public void addObserver(@NonNull T observer) {
mObservers.add(Objects.requireNonNull(observer));
}
public void removeObserver(T observer) {
mObservers.remove(observer);
}
public void dispatch(Consumer<T> consumer) {
for (int i = 0; i < mObservers.size(); i++) {
consumer.accept(mObservers.get(i));
}
}
/**
* Will dispatch the consumer to the observer, along with a single argument of type<U>.
*/
public <U> void dispatch(BiConsumer<T, U> biConsumer, U arg) {
for (int i = 0; i < mObservers.size(); i++) {
biConsumer.accept(mObservers.get(i), arg);
}
}
}
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