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      1 /*
      2  * Copyright (C) 2017 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 
     17 package android.car.vms;
     18 
     19 import android.car.annotation.FutureFeature;
     20 import android.os.Parcel;
     21 import android.os.Parcelable;
     22 import java.util.ArrayList;
     23 import java.util.Arrays;
     24 import java.util.Collections;
     25 import java.util.HashSet;
     26 import java.util.List;
     27 import java.util.Set;
     28 
     29 /**
     30  * A dependency for a VMS layer on other VMS layers.
     31  *
     32  * @hide
     33  */
     34 @FutureFeature
     35 public final class VmsLayerDependency implements Parcelable {
     36     private final VmsLayer mLayer;
     37     private final Set<VmsLayer> mDependency;
     38 
     39     /**
     40      * Construct a dependency for layer on other layers.
     41      */
     42     public VmsLayerDependency(VmsLayer layer, Set<VmsLayer> dependencies) {
     43         mLayer = layer;
     44         mDependency = Collections.unmodifiableSet(dependencies);
     45     }
     46 
     47     /**
     48      * Constructs a layer without a dependency.
     49      */
     50     public VmsLayerDependency(VmsLayer layer) {
     51         mLayer = layer;
     52         mDependency = Collections.emptySet();
     53     }
     54 
     55     /**
     56      * Checks if a layer has a dependency.
     57      */
     58     public boolean hasDependencies() {
     59         return (!mDependency.isEmpty());
     60     }
     61 
     62     public VmsLayer getLayer() {
     63         return mLayer;
     64     }
     65 
     66     /**
     67      * Returns the dependencies.
     68      */
     69     public Set<VmsLayer> getDependencies() {
     70         return mDependency;
     71     }
     72 
     73     public static final Parcelable.Creator<VmsLayerDependency> CREATOR = new
     74         Parcelable.Creator<VmsLayerDependency>() {
     75             public VmsLayerDependency createFromParcel(Parcel in) {
     76                 return new VmsLayerDependency(in);
     77             }
     78             public VmsLayerDependency[] newArray(int size) {
     79                 return new VmsLayerDependency[size];
     80             }
     81         };
     82 
     83     @Override
     84     public void writeToParcel(Parcel out, int flags) {
     85         out.writeParcelable(mLayer, flags);
     86         out.writeParcelableList(new ArrayList<VmsLayer>(mDependency), flags);
     87     }
     88 
     89     @Override
     90     public int describeContents() {
     91         return 0;
     92     }
     93 
     94     private VmsLayerDependency(Parcel in) {
     95         mLayer = in.readParcelable(VmsLayer.class.getClassLoader());
     96         List<VmsLayer> dependency = new ArrayList<>();
     97         in.readParcelableList(dependency, VmsLayer.class.getClassLoader());
     98         mDependency = Collections.unmodifiableSet(new HashSet<VmsLayer>(dependency));
     99     }
    100 }