| /* |
| * 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 com.android.car; |
| |
| import android.annotation.XmlRes; |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.content.res.XmlResourceParser; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.util.Xml; |
| |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /* package */ class CarVolumeGroupsHelper { |
| |
| private static final String TAG_VOLUME_GROUPS = "volumeGroups"; |
| private static final String TAG_GROUP = "group"; |
| private static final String TAG_CONTEXT = "context"; |
| |
| private final Context mContext; |
| private final @XmlRes int mXmlConfiguration; |
| |
| CarVolumeGroupsHelper(Context context, @XmlRes int xmlConfiguration) { |
| mContext = context; |
| mXmlConfiguration = xmlConfiguration; |
| } |
| |
| CarVolumeGroup[] loadVolumeGroups() { |
| List<CarVolumeGroup> carVolumeGroups = new ArrayList<>(); |
| try (XmlResourceParser parser = mContext.getResources().getXml(mXmlConfiguration)) { |
| AttributeSet attrs = Xml.asAttributeSet(parser); |
| int type; |
| // Traverse to the first start tag |
| while ((type=parser.next()) != XmlResourceParser.END_DOCUMENT |
| && type != XmlResourceParser.START_TAG) { |
| } |
| |
| if (!TAG_VOLUME_GROUPS.equals(parser.getName())) { |
| throw new RuntimeException("Meta-data does not start with volumeGroups tag"); |
| } |
| int outerDepth = parser.getDepth(); |
| int id = 0; |
| while ((type=parser.next()) != XmlResourceParser.END_DOCUMENT |
| && (type != XmlResourceParser.END_TAG || parser.getDepth() > outerDepth)) { |
| if (type == XmlResourceParser.END_TAG) { |
| continue; |
| } |
| if (TAG_GROUP.equals(parser.getName())) { |
| carVolumeGroups.add(parseVolumeGroup(id, attrs, parser)); |
| id++; |
| } |
| } |
| } catch (Exception e) { |
| Log.e(CarLog.TAG_AUDIO, "Error parsing volume groups configuration", e); |
| } |
| return carVolumeGroups.toArray(new CarVolumeGroup[carVolumeGroups.size()]); |
| } |
| |
| private CarVolumeGroup parseVolumeGroup(int id, AttributeSet attrs, XmlResourceParser parser) |
| throws XmlPullParserException, IOException { |
| int type; |
| |
| List<Integer> contexts = new ArrayList<>(); |
| int innerDepth = parser.getDepth(); |
| while ((type=parser.next()) != XmlResourceParser.END_DOCUMENT |
| && (type != XmlResourceParser.END_TAG || parser.getDepth() > innerDepth)) { |
| if (type == XmlResourceParser.END_TAG) { |
| continue; |
| } |
| if (TAG_CONTEXT.equals(parser.getName())) { |
| TypedArray c = mContext.getResources().obtainAttributes( |
| attrs, R.styleable.volumeGroups_context); |
| contexts.add(c.getInt(R.styleable.volumeGroups_context_context, -1)); |
| c.recycle(); |
| } |
| } |
| |
| return new CarVolumeGroup(mContext, id, |
| contexts.stream().mapToInt(i -> i).filter(i -> i >= 0).toArray()); |
| } |
| } |