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Tinker is a hot-fix solution library for Android, it supports dex, library and resources update without reinstalling apk.

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/*
 * Tencent is pleased to support the open source community by making Tinker available.
 *
 * Copyright (C) 2016 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * Licensed under the BSD 3-Clause License (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * https://opensource.org/licenses/BSD-3-Clause
 *
 * 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.tencent.tinker.build.util;

import com.tencent.tinker.build.info.InfoWriter;
import com.tencent.tinker.build.patch.Configuration;

import java.io.File;
import java.io.IOException;

/**
 * Created by zhangshaowen on 16/4/7.
 */
public class Logger {
    private static InfoWriter logWriter;

    public static void initLogger(Configuration config) throws IOException {
        String logPath = config.mOutFolder + File.separator + TypedValue.FILE_LOG;
        logWriter = new InfoWriter(config, logPath);
    }

    public static void closeLogger() {
        if (logWriter != null) {
            logWriter.close();
        }
    }

    public static void d(final String msg) {
        Logger.d(msg, new Object[]{});
    }

    public static void d(final String format, final Object... obj) {

        String log = obj.length == 0 ? format : String.format(format, obj);
        if (log == null) {
            log = "";
        }
        //add \n
        System.out.printf(log + "\n");
        System.out.flush();

        logWriter.writeLineToInfoFile(log);
    }

    public static void e(final String msg) {
        Logger.e(msg, new Object[]{});
    }

    public static void e(final String format, final Object... obj) {
        String log = obj.length == 0 ? format : String.format(format, obj);
        if (log == null) {
            log = "";
        }
        //add \n
        System.err.printf(log + "\n");
        System.err.flush();

        logWriter.writeLineToInfoFile(log);
    }

}