MultiValueSet.java
/*
* Copyright 2019 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 androidx.camera.core.impl;
import androidx.annotation.NonNull;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* A value set implementation that store multiple values in type C.
*
* @param <C> The type of the parameter.
*/
public abstract class MultiValueSet<C> {
private Set<C> mSet = new HashSet<>();
/**
* Adds all of the elements in the specified collection to this value set if they're not already
* present (optional operation).
*
* @param value collection containing elements to be added to this value.
*/
public void addAll(@NonNull List<C> value) {
mSet.addAll(value);
}
/**
* Returns the list of {@link C} which containing all the elements were added to this value set.
*/
@NonNull
public List<C> getAllItems() {
return Collections.unmodifiableList(new ArrayList<>(mSet));
}
/**
* Need to implement the clone method for object copy.
* @return the cloned instance.
*/
@Override
public abstract @NonNull MultiValueSet<C> clone();
}