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some utility class for java develop
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package com.star.log.dialect.console;

import com.star.lang.Console;
import com.star.log.AbstractLog;
import com.star.log.level.Level;
import com.star.string.StringUtil;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * 利用System.out.println()打印日志
 *
 * @author Looly
 */
public class ConsoleLog extends AbstractLog {
    private static final long serialVersionUID = -6843151523380063975L;

    private static String logFormat = "[{date}] [{level}] {name}: {msg}";
    private static Level level = Level.DEBUG;

    private String name;

    //------------------------------------------------------------------------- Constructor

    /**
     * 构造
     *
     * @param clazz 类
     */
    public ConsoleLog(Class clazz) {
        this.name = clazz.getName();
    }

    /**
     * 构造
     *
     * @param name 类名
     */
    public ConsoleLog(String name) {
        this.name = name;
    }

    @Override
    public String getName() {
        return this.name;
    }

    //------------------------------------------------------------------------- Trace
    @Override
    public boolean isTraceEnabled() {
        return level.compareTo(Level.TRACE) <= 0;
    }

    @Override
    public void trace(String format, Object... arguments) {
        log(Level.TRACE, format, arguments);
    }

    @Override
    public void trace(Throwable t, String format, Object... arguments) {
        log(Level.TRACE, t, format, arguments);
    }

    //------------------------------------------------------------------------- Debug
    @Override
    public boolean isDebugEnabled() {
        return level.compareTo(Level.DEBUG) <= 0;
    }

    @Override
    public void debug(String format, Object... arguments) {
        log(Level.DEBUG, format, arguments);
    }

    @Override
    public void debug(Throwable t, String format, Object... arguments) {
        log(Level.DEBUG, t, format, arguments);
    }

    //------------------------------------------------------------------------- Info
    @Override
    public boolean isInfoEnabled() {
        return level.compareTo(Level.INFO) <= 0;
    }

    @Override
    public void info(String format, Object... arguments) {
        log(Level.INFO, format, arguments);
    }

    @Override
    public void info(Throwable t, String format, Object... arguments) {
        log(Level.INFO, t, format, arguments);
    }

    //------------------------------------------------------------------------- Warn
    @Override
    public boolean isWarnEnabled() {
        return level.compareTo(Level.WARN) <= 0;
    }

    @Override
    public void warn(String format, Object... arguments) {
        log(Level.WARN, format, arguments);
    }

    @Override
    public void warn(Throwable t, String format, Object... arguments) {
        log(Level.WARN, t, format, arguments);
    }

    //------------------------------------------------------------------------- Error
    @Override
    public boolean isErrorEnabled() {
        return level.compareTo(Level.ERROR) <= 0;
    }

    @Override
    public void error(String format, Object... arguments) {
        log(Level.ERROR, format, arguments);
    }

    @Override
    public void error(Throwable t, String format, Object... arguments) {
        log(Level.ERROR, t, format, arguments);
    }

    //------------------------------------------------------------------------- Log
    @Override
    public void log(Level level, String format, Object... arguments) {
        this.log(level, null, format, arguments);
    }

    @Override
    public void log(Level level, Throwable t, String format, Object... arguments) {
        if (!isEnabled(level)) {
            return;
        }

        final Map maps = new HashMap<>(4);
        maps.put("date", LocalDateTime.now());
        maps.put("level", level.toString());
        maps.put("name", this.name);
        maps.put("msg", StringUtil.format(format, arguments));


        String logMsg = StringUtil.format(logFormat, maps);

        //WARN以上级别打印至System.err
        if (level.ordinal() >= Level.WARN.ordinal()) {
            Console.error(t, logMsg);
        } else {
            Console.log(t, logMsg);
        }

    }
}