com.dahuatech.hutool.log.dialect.slf4j.Slf4jLogFactory Maven / Gradle / Ivy

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package com.dahuatech.hutool.log.dialect.slf4j;

import com.dahuatech.hutool.log.Log;
import com.dahuatech.hutool.log.LogFactory;
import org.slf4j.LoggerFactory;
import org.slf4j.helpers.NOPLoggerFactory;

import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;

/**
 * SLF4J log.

 * 同样无缝支持 LogBack
 *
 * @author Looly
 */
public class Slf4jLogFactory extends LogFactory {

  public Slf4jLogFactory() {
    this(false);
  }

  /**
   * 构造
   *
   * @param failIfNOP 如果未找到桥接包是否报错
   */
  public Slf4jLogFactory(boolean failIfNOP) {
    super("Slf4j");
    checkLogExist(LoggerFactory.class);
    if (false == failIfNOP) {
      return;
    }

    // SFL4J writes it error messages to System.err. Capture them so that the user does not see such
    // a message on
    // the console during automatic detection.
    final StringBuilder buf = new StringBuilder();
    final PrintStream err = System.err;
    try {
      System.setErr(
          new PrintStream(
              new OutputStream() {
                @Override
                public void write(int b) {
                  buf.append((char) b);
                }
              },
              true,
              "US-ASCII"));
    } catch (UnsupportedEncodingException e) {
      throw new Error(e);
    }

    try {
      if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
        throw new NoClassDefFoundError(buf.toString());
      } else {
        err.print(buf);
        err.flush();
      }
    } finally {
      System.setErr(err);
    }
  }

  @Override
  public Log createLog(String name) {
    return new com.dahuatech.hutool.log.dialect.slf4j.Slf4jLog(name);
  }

  @Override
  public Log createLog(Class clazz) {
    return new Slf4jLog(clazz);
  }
}