services/usage/java/com/android/server/usage/UsageStatsXml.java

/**
 * 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.Slog;
import android.util.Xml;

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 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);
        }
    }
}