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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 package com.android.server.usb.descriptors.tree;
     17 
     18 import com.android.server.usb.descriptors.UsbInterfaceDescriptor;
     19 import com.android.server.usb.descriptors.report.ReportCanvas;
     20 
     21 import java.util.ArrayList;
     22 
     23 /**
     24  * @hide
     25  * Represents an interface in the descriptors tree.
     26  */
     27 public final class UsbDescriptorsInterfaceNode extends UsbDescriptorsTreeNode {
     28     private static final String TAG = "UsbDescriptorsInterfaceNode";
     29 
     30     private final UsbInterfaceDescriptor mInterfaceDescriptor;
     31 
     32     private final ArrayList<UsbDescriptorsEndpointNode> mEndpointNodes = new ArrayList<>();
     33     private final ArrayList<UsbDescriptorsACInterfaceNode> mACInterfaceNodes = new ArrayList<>();
     34 
     35     /**
     36      * Constructor.
     37      * @param interfaceDescriptor   The Interface Descriptor object wrapped by this tree node.
     38      */
     39     public UsbDescriptorsInterfaceNode(UsbInterfaceDescriptor interfaceDescriptor) {
     40         mInterfaceDescriptor = interfaceDescriptor;
     41     }
     42 
     43     /**
     44      * Adds an endpoint descriptor as a child of this interface node.
     45      * @param endpointNode The endpoint descriptor node to add to this interface node.
     46      */
     47     public void addEndpointNode(UsbDescriptorsEndpointNode endpointNode) {
     48         mEndpointNodes.add(endpointNode);
     49     }
     50 
     51     /**
     52      * Adds an Audio-class interface descriptor as a child of this interface node.
     53      * @param acInterfaceNode The audio-class descriptor node to add to this interface node.
     54      */
     55     public void addACInterfaceNode(UsbDescriptorsACInterfaceNode acInterfaceNode) {
     56         mACInterfaceNodes.add(acInterfaceNode);
     57     }
     58 
     59     @Override
     60     public void report(ReportCanvas canvas) {
     61         mInterfaceDescriptor.report(canvas);
     62 
     63         // Audio Class Interfaces
     64         if (mACInterfaceNodes.size() > 0) {
     65             canvas.writeParagraph("Audio Class Interfaces", false);
     66             canvas.openList();
     67             for (UsbDescriptorsACInterfaceNode node : mACInterfaceNodes) {
     68                 node.report(canvas);
     69             }
     70             canvas.closeList();
     71         }
     72 
     73         // Endpoints
     74         if (mEndpointNodes.size() > 0) {
     75             canvas.writeParagraph("Endpoints", false);
     76             canvas.openList();
     77             for (UsbDescriptorsEndpointNode node : mEndpointNodes) {
     78                 node.report(canvas);
     79             }
     80             canvas.closeList();
     81         }
     82     }
     83 }
     84