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  * 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
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  * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
Abstract implementation of a log.

This class is useful to avoid the need of implementing all the methods defined in the interface.

A standard format is applied to the log messages.
The inheriting class may just implement the writing of the formatted message, or customize it at any level.

Created by davide on 10/3/14.

public abstract class TemplateLog implements Log {
    private static final String DATE_FORMAT = "MM/dd HH:mm:ss.SSS z";
    private static final String EXCEPTION_FORMAT = " > caused by:%n%s";
    private static final String LOG_FORMAT = "%s\t%s\t%s\t%s> %s";
    private static String format(@Nonnull final LogLevel level,
            @Nonnull final List<Objectcontexts, @Nullable final String message) {
        return String.format(,
                             new SimpleDateFormat(, Locale.getDefault()).format(
                                     new Date()), Thread.currentThread().getName(),
                             contexts.toString(), levelmessage);
    public void dbg(@Nonnull final List<Objectcontexts, @Nullable final String message,
            @Nullable final Throwable throwable) {
    public void err(@Nonnull final List<Objectcontexts, @Nullable final String message,
            @Nullable final Throwable throwable) {
    public void wrn(@Nonnull final List<Objectcontexts, @Nullable final String message,
            @Nullable final Throwable throwable) {

Formats and then write the specified log message.

level the log level.
contexts the log context array.
message the log message.
throwable the related exception.
    protected void log(@Nonnull final LogLevel level, @Nonnull final List<Objectcontexts,
            @Nullable final String message, @Nullable final Throwable throwable) {
        String formatted = format(levelcontextsmessage);
        if (throwable != null) {
            formatted += String.format(, Logger.printStackTrace(throwable));

Writes the specified message after it's been formatted.

message the message.
    protected void log(@Nonnull final String message) {
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