MutableOptionsBundle.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 androidx.annotation.Nullable;
import java.util.Comparator;
import java.util.TreeMap;
/**
* A MutableOptionsBundle is an {@link OptionsBundle} which allows for insertion/removal.
*/
public final class MutableOptionsBundle extends OptionsBundle implements MutableConfig {
private static final Comparator<Option<?>> ID_COMPARE =
new Comparator<Option<?>>() {
@Override
public int compare(Option<?> o1, Option<?> o2) {
return o1.getId().compareTo(o2.getId());
}
};
private MutableOptionsBundle(TreeMap<Option<?>, Object> persistentOptions) {
super(persistentOptions);
}
/**
* Creates an empty MutableOptionsBundle.
*
* @return an empty MutableOptionsBundle containing no options.
*/
@NonNull
public static MutableOptionsBundle create() {
return new MutableOptionsBundle(new TreeMap<>(ID_COMPARE));
}
/**
* Creates a MutableOptionsBundle from an existing immutable Config.
*
* @param otherConfig configuration options to insert.
* @return a MutableOptionsBundle prepopulated with configuration options.
*/
@NonNull
public static MutableOptionsBundle from(@NonNull Config otherConfig) {
TreeMap<Option<?>, Object> persistentOptions = new TreeMap<>(ID_COMPARE);
for (Option<?> opt : otherConfig.listOptions()) {
persistentOptions.put(opt, otherConfig.retrieveOption(opt));
}
return new MutableOptionsBundle(persistentOptions);
}
@Nullable
@Override
public <ValueT> ValueT removeOption(@NonNull Option<ValueT> opt) {
@SuppressWarnings("unchecked") // Options should have only been inserted via insertOption()
ValueT value = (ValueT) mOptions.remove(opt);
return value;
}
@Override
public <ValueT> void insertOption(@NonNull Option<ValueT> opt, @Nullable ValueT value) {
mOptions.put(opt, value);
}
}