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/*
* Copyright (C) 2012 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.utils;
import com.android.SdkConstants;
import com.android.annotations.NonNull;
import java.io.PrintStream;
import java.util.Formatter;
/**
* An implementation of {@link ILogger} that prints to {@link System#out} and {@link System#err}.
* <p/>
*
*/
public class StdLogger implements ILogger {
private final Level mLevel;
public enum Level {
VERBOSE(0),
INFO(1),
WARNING(2),
ERROR(3);
private final int mLevel;
Level(int level) {
mLevel = level;
}
}
/**
* Creates the {@link StdLogger} with a given log {@link Level}.
* @param level the log Level.
*/
public StdLogger(@NonNull Level level) {
if (level == null) {
throw new IllegalArgumentException("level cannot be null");
}
mLevel = level;
}
/**
* Returns the logger's log {@link Level}.
* @return the log level.
*/
public Level getLevel() {
return mLevel;
}
/**
* Prints an error message.
* <p/>
* The message will be tagged with "Error" on the output so the caller does not
* need to put such a prefix in the format string.
* <p/>
* The output is done on {@link System#err}.
* <p/>
* This is always displayed, independent of the logging {@link Level}.
*
* @param t is an optional {@link Throwable} or {@link Exception}. If non-null, it's
* message will be printed out.
* @param errorFormat is an optional error format. If non-null, it will be printed
* using a {@link Formatter} with the provided arguments.
* @param args provides the arguments for errorFormat.
*/
@Override
public void error(Throwable t, String errorFormat, Object... args) {
if (errorFormat != null) {
String msg = String.format("Error: " + errorFormat, args);
printMessage(msg, System.err);
}
if (t != null) {
System.err.println(String.format("Error: %1$s", t.getMessage()));
}
}
/**
* Prints a warning message.
* <p/>
* The message will be tagged with "Warning" on the output so the caller does not
* need to put such a prefix in the format string.
* <p/>
* The output is done on {@link System#out}.
* <p/>
* This is displayed only if the logging {@link Level} is {@link Level#WARNING} or higher.
*
* @param warningFormat is a string format to be used with a {@link Formatter}. Cannot be null.
* @param args provides the arguments for warningFormat.
*/
@Override
public void warning(@NonNull String warningFormat, Object... args) {
if (mLevel.mLevel > Level.WARNING.mLevel) {
return;
}
String msg = String.format("Warning: " + warningFormat, args);
printMessage(msg, System.out);
}
/**
* Prints an info message.
* <p/>
* The output is done on {@link System#out}.
* <p/>
* This is displayed only if the logging {@link Level} is {@link Level#INFO} or higher.
*
* @param msgFormat is a string format to be used with a {@link Formatter}. Cannot be null.
* @param args provides the arguments for msgFormat.
*/
@Override
public void info(@NonNull String msgFormat, Object... args) {
if (mLevel.mLevel > Level.INFO.mLevel) {
return;
}
String msg = String.format(msgFormat, args);
printMessage(msg, System.out);
}
/**
* Prints a verbose message.
* <p/>
* The output is done on {@link System#out}.
* <p/>
* This is displayed only if the logging {@link Level} is {@link Level#VERBOSE} or higher.
*
* @param msgFormat is a string format to be used with a {@link Formatter}. Cannot be null.
* @param args provides the arguments for msgFormat.
*/
@Override
public void verbose(@NonNull String msgFormat, Object... args) {
if (mLevel.mLevel > Level.VERBOSE.mLevel) {
return;
}
String msg = String.format(msgFormat, args);
printMessage(msg, System.out);
}
private void printMessage(String msg, PrintStream stream) {
if (SdkConstants.CURRENT_PLATFORM == SdkConstants.PLATFORM_WINDOWS &&
!msg.endsWith("\r\n") &&
msg.endsWith("\n")) {
// remove last \n so that println can use \r\n as needed.
msg = msg.substring(0, msg.length() - 1);
}
stream.print(msg);
if (!msg.endsWith("\n")) {
stream.println();
}
}
}
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