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1 /**
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy
6  * 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, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations
14  * under the License.
15  */
16 
17 package com.android.server.usage;
18 
19 import android.util.AtomicFile;
20 import android.util.Slog;
21 import android.util.Xml;
22 import com.android.internal.util.FastXmlSerializer;
23 import com.android.internal.util.XmlUtils;
24 import org.xmlpull.v1.XmlPullParser;
25 import org.xmlpull.v1.XmlPullParserException;
26 
27 import java.io.*;
28 
29 public class UsageStatsXml {
30     private static final String TAG = "UsageStatsXml";
31     private static final int CURRENT_VERSION = 1;
32     private static final String USAGESTATS_TAG = "usagestats";
33     private static final String VERSION_ATTR = "version";
34     static final String CHECKED_IN_SUFFIX = "-c";
35 
parseBeginTime(AtomicFile file)36     public static long parseBeginTime(AtomicFile file) throws IOException {
37         return parseBeginTime(file.getBaseFile());
38     }
39 
parseBeginTime(File file)40     public static long parseBeginTime(File file) throws IOException {
41         String name = file.getName();
42 
43         // Eat as many occurrences of -c as possible. This is due to a bug where -c
44         // would be appended more than once to a checked-in file, causing a crash
45         // on boot when indexing files since Long.parseLong() will puke on anything but
46         // a number.
47         while (name.endsWith(CHECKED_IN_SUFFIX)) {
48             name = name.substring(0, name.length() - CHECKED_IN_SUFFIX.length());
49         }
50 
51         try {
52             return Long.parseLong(name);
53         } catch (NumberFormatException e) {
54             throw new IOException(e);
55         }
56     }
57 
read(AtomicFile file, IntervalStats statsOut)58     public static void read(AtomicFile file, IntervalStats statsOut) throws IOException {
59         try {
60             FileInputStream in = file.openRead();
61             try {
62                 statsOut.beginTime = parseBeginTime(file);
63                 read(in, statsOut);
64                 statsOut.lastTimeSaved = file.getLastModifiedTime();
65             } finally {
66                 try {
67                     in.close();
68                 } catch (IOException e) {
69                     // Empty
70                 }
71             }
72         } catch (FileNotFoundException e) {
73             Slog.e(TAG, "UsageStats Xml", e);
74             throw e;
75         }
76     }
77 
write(AtomicFile file, IntervalStats stats)78     public static void write(AtomicFile file, IntervalStats stats) throws IOException {
79         FileOutputStream fos = file.startWrite();
80         try {
81             write(fos, stats);
82             file.finishWrite(fos);
83             fos = null;
84         } finally {
85             // When fos is null (successful write), this will no-op
86             file.failWrite(fos);
87         }
88     }
89 
read(InputStream in, IntervalStats statsOut)90     static void read(InputStream in, IntervalStats statsOut) throws IOException {
91         XmlPullParser parser = Xml.newPullParser();
92         try {
93             parser.setInput(in, "utf-8");
94             XmlUtils.beginDocument(parser, USAGESTATS_TAG);
95             String versionStr = parser.getAttributeValue(null, VERSION_ATTR);
96             try {
97                 switch (Integer.parseInt(versionStr)) {
98                     case 1:
99                         UsageStatsXmlV1.read(parser, statsOut);
100                         break;
101 
102                     default:
103                         Slog.e(TAG, "Unrecognized version " + versionStr);
104                         throw new IOException("Unrecognized version " + versionStr);
105                 }
106             } catch (NumberFormatException e) {
107                 Slog.e(TAG, "Bad version");
108                 throw new IOException(e);
109             }
110         } catch (XmlPullParserException e) {
111             Slog.e(TAG, "Failed to parse Xml", e);
112             throw new IOException(e);
113         }
114     }
115 
write(OutputStream out, IntervalStats stats)116     static void write(OutputStream out, IntervalStats stats) throws IOException {
117         FastXmlSerializer xml = new FastXmlSerializer();
118         xml.setOutput(out, "utf-8");
119         xml.startDocument("utf-8", true);
120         xml.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
121         xml.startTag(null, USAGESTATS_TAG);
122         xml.attribute(null, VERSION_ATTR, Integer.toString(CURRENT_VERSION));
123 
124         UsageStatsXmlV1.write(xml, stats);
125 
126         xml.endTag(null, USAGESTATS_TAG);
127         xml.endDocument();
128     }
129 }