Copyright (C) 2018 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.
/**
 * Copyright (C) 2018 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.hardware.radio;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.RemoteException;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Set;

final class Utils {
    private static final String TAG = "BroadcastRadio.utils";

    static void writeStringMap(@NonNull Parcel dest, @Nullable Map<String, String> map) {
        if (map == null) {
            dest.writeInt(0);
            return;
        }
        dest.writeInt(map.size());
        for (Map.Entry<String, String> entry : map.entrySet()) {
            dest.writeString(entry.getKey());
            dest.writeString(entry.getValue());
        }
    }

    static @NonNull Map<String, String> readStringMap(@NonNull Parcel in) {
        int size = in.readInt();
        Map<String, String> map = new HashMap<>();
        while (size-- > 0) {
            String key = in.readString();
            String value = in.readString();
            map.put(key, value);
        }
        return map;
    }

    static void writeStringIntMap(@NonNull Parcel dest, @Nullable Map<String, Integer> map) {
        if (map == null) {
            dest.writeInt(0);
            return;
        }
        dest.writeInt(map.size());
        for (Map.Entry<String, Integer> entry : map.entrySet()) {
            dest.writeString(entry.getKey());
            dest.writeInt(entry.getValue());
        }
    }

    static @NonNull Map<String, Integer> readStringIntMap(@NonNull Parcel in) {
        int size = in.readInt();
        Map<String, Integer> map = new HashMap<>();
        while (size-- > 0) {
            String key = in.readString();
            int value = in.readInt();
            map.put(key, value);
        }
        return map;
    }

    static <T extends Parcelable> void writeSet(@NonNull Parcel dest, @Nullable Set<T> set) {
        if (set == null) {
            dest.writeInt(0);
            return;
        }
        dest.writeInt(set.size());
        set.stream().forEach(elem -> dest.writeTypedObject(elem, 0));
    }

    static <T> Set<T> createSet(@NonNull Parcel in, Parcelable.Creator<T> c) {
        int size = in.readInt();
        Set<T> set = new HashSet<>();
        while (size-- > 0) {
            set.add(in.readTypedObject(c));
        }
        return set;
    }

    static void writeIntSet(@NonNull Parcel dest, @Nullable Set<Integer> set) {
        if (set == null) {
            dest.writeInt(0);
            return;
        }
        dest.writeInt(set.size());
        set.stream().forEach(elem -> dest.writeInt(Objects.requireNonNull(elem)));
    }

    static Set<Integer> createIntSet(@NonNull Parcel in) {
        return createSet(in, new Parcelable.Creator<Integer>() {
            public Integer createFromParcel(Parcel in) {
                return in.readInt();
            }

            public Integer[] newArray(int size) {
                return new Integer[size];
            }
        });
    }

    static <T extends Parcelable> void writeTypedCollection(@NonNull Parcel dest,
            @Nullable Collection<T> coll) {
        ArrayList<T> list = null;
        if (coll != null) {
            if (coll instanceof ArrayList) {
                list = (ArrayList) coll;
            } else {
                list = new ArrayList<>(coll);
            }
        }
        dest.writeTypedList(list);
    }

    static void close(ICloseHandle handle) {
        try {
            handle.close();
        } catch (RemoteException ex) {
            ex.rethrowFromSystemServer();
        }
    }
}