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package com.github.javaparser.utils;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import static com.github.javaparser.utils.CodeGenerationUtils.f;
/**
* To avoid dependencies on logging frameworks, we have invented yet another logging framework :-)
*/
public class Log {
/**
* This adapter logs to standard out and standard error.
*/
public static class StandardOutStandardErrorAdapter implements Adapter {
@Override
public void info(String message) {
System.out.println(message);
}
@Override
public void trace(String message) {
System.out.println(message);
}
@Override
public void error(Throwable throwable, String message) {
if (message == null) {
System.err.println(throwable.getMessage());
printStackTrace(throwable);
} else if (throwable == null) {
System.err.println(message);
} else {
System.err.println(message + ":" + throwable.getMessage());
printStackTrace(throwable);
}
}
private void printStackTrace(Throwable throwable) {
try (StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw)) {
throwable.printStackTrace(pw);
trace(sw.toString());
} catch (IOException e) {
throw new AssertionError("Error in logging library");
}
}
}
/**
* This adapter logs nothing.
*/
public static class SilentAdapter implements Adapter {
@Override
public void info(String message) {
}
@Override
public void trace(String message) {
}
@Override
public void error(Throwable throwable, String f) {
}
}
public interface Adapter {
void info(String message);
void trace(String message);
/**
* Both can be null.
*/
void error(Throwable throwable, String f);
}
private static Adapter CURRENT_ADAPTER = new SilentAdapter();
/**
* Change how logging is handled. You can set your own implementation that forwards to your logging library.
*/
public static void setAdapter(Adapter adapter) {
CURRENT_ADAPTER = adapter;
}
/**
* For logging information that may help solving a problem.
*/
public static void trace(String format, Object... args) {
CURRENT_ADAPTER.trace(f(format, args));
}
/**
* For logging things that are nice to see scrolling by.
*/
public static void info(String format, Object... args) {
CURRENT_ADAPTER.info(f(format, args));
}
/**
* For drawing attention to an error.
*/
public static void error(Throwable throwable) {
CURRENT_ADAPTER.error(throwable, null);
}
/**
* For drawing attention to an error that you don't have an exception for.
*/
public static void error(Throwable throwable, String format, Object... args) {
CURRENT_ADAPTER.error(throwable, f(format, args));
}
/**
* For drawing attention to an error that you don't have an exception for.
*/
public static void error(String format, Object... args) {
CURRENT_ADAPTER.error(null, f(format, args));
}
}
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