content: /**
   * Copyright (C) 2014 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.server.usage;
  
  import android.util.AtomicFile;
  import android.util.Slog;
  import android.util.Xml;
  import android.util.proto.ProtoInputStream;
  import android.util.proto.ProtoOutputStream;
  
  import com.android.internal.util.FastXmlSerializer;
  import com.android.internal.util.XmlUtils;
  import org.xmlpull.v1.XmlPullParser;
  import org.xmlpull.v1.XmlPullParserException;
  
  import java.io.*;
  
  public class UsageStatsXml {
      private static final String TAG = "UsageStatsXml";
      private static final int CURRENT_VERSION = 1;
      private static final String USAGESTATS_TAG = "usagestats";
      private static final String VERSION_ATTR = "version";
      static final String CHECKED_IN_SUFFIX = "-c";
  
      public static void read(InputStream in, IntervalStats statsOut) throws IOException {
          XmlPullParser parser = Xml.newPullParser();
          try {
              parser.setInput(in, "utf-8");
              XmlUtils.beginDocument(parser, USAGESTATS_TAG);
              String versionStr = parser.getAttributeValue(null, VERSION_ATTR);
              try {
                  switch (Integer.parseInt(versionStr)) {
                      case 1:
                          UsageStatsXmlV1.read(parser, statsOut);
                          break;
  
                      default:
                          Slog.e(TAG, "Unrecognized version " + versionStr);
                          throw new IOException("Unrecognized version " + versionStr);
                  }
              } catch (NumberFormatException e) {
                  Slog.e(TAG, "Bad version");
                  throw new IOException(e);
              }
          } catch (XmlPullParserException e) {
              Slog.e(TAG, "Failed to parse Xml", e);
              throw new IOException(e);
          }
      }
  
      public static void write(OutputStream out, IntervalStats stats) throws IOException {
          FastXmlSerializer xml = new FastXmlSerializer();
          xml.setOutput(out, "utf-8");
          xml.startDocument("utf-8", true);
          xml.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
          xml.startTag(null, USAGESTATS_TAG);
          xml.attribute(null, VERSION_ATTR, Integer.toString(CURRENT_VERSION));
  
          UsageStatsXmlV1.write(xml, stats);
  
          xml.endTag(null, USAGESTATS_TAG);
          xml.endDocument();
      }
  }