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/**
* 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.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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";
public static long parseBeginTime(AtomicFile file) {
return Long.parseLong(file.getBaseFile().getName());
}
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);
}
}
private 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);
}
}
private 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();
}
}
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