| /** |
| * 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 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 long parseBeginTime(AtomicFile file) throws IOException { |
| return parseBeginTime(file.getBaseFile()); |
| } |
| |
| public static long parseBeginTime(File file) throws IOException { |
| String name = file.getName(); |
| |
| // Eat as many occurrences of -c as possible. This is due to a bug where -c |
| // would be appended more than once to a checked-in file, causing a crash |
| // on boot when indexing files since Long.parseLong() will puke on anything but |
| // a number. |
| while (name.endsWith(CHECKED_IN_SUFFIX)) { |
| name = name.substring(0, name.length() - CHECKED_IN_SUFFIX.length()); |
| } |
| |
| try { |
| return Long.parseLong(name); |
| } catch (NumberFormatException e) { |
| throw new IOException(e); |
| } |
| } |
| |
| public static void read(AtomicFile file, IntervalStats statsOut) throws IOException { |
| try { |
| FileInputStream in = file.openRead(); |
| try { |
| statsOut.beginTime = parseBeginTime(file); |
| read(in, statsOut); |
| statsOut.lastTimeSaved = file.getLastModifiedTime(); |
| } finally { |
| try { |
| in.close(); |
| } catch (IOException e) { |
| // Empty |
| } |
| } |
| } catch (FileNotFoundException e) { |
| Slog.e(TAG, "UsageStats Xml", e); |
| throw e; |
| } |
| } |
| |
| public static void write(AtomicFile file, IntervalStats stats) throws IOException { |
| FileOutputStream fos = file.startWrite(); |
| try { |
| write(fos, stats); |
| file.finishWrite(fos); |
| fos = null; |
| } finally { |
| // When fos is null (successful write), this will no-op |
| file.failWrite(fos); |
| } |
| } |
| |
| 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); |
| } |
| } |
| |
| 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(); |
| } |
| } |