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/*******************************************************************************
 * Copyright (c) 2010, 2011 Sonatype, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Sonatype, Inc. - initial API and implementation
 *******************************************************************************/
package shaded.shaded.org.eclipse.aether.spi.log;

/**
 * A simple logger to facilitate emission of diagnostic messages. In general, unrecoverable errors should be reported
 * via exceptions and informational notifications should be reported via events, hence this logger interface focuses on
 * support for tracing.
 */
public interface Logger
{

    /**
     * Indicates whether debug logging is enabled.
     * 
     * @return {@code true} if debug logging is enabled, {@code false} otherwise.
     */
    boolean isDebugEnabled();

    /**
     * Emits the specified message.
     * 
     * @param msg The message to log, must not be {@code null}.
     */
    void debug( String msg );

    /**
     * Emits the specified message along with a stack trace of the given exception.
     * 
     * @param msg The message to log, must not be {@code null}.
     * @param error The exception to log, may be {@code null}.
     */
    void debug( String msg, Throwable error );

    /**
     * Indicates whether warn logging is enabled.
     * 
     * @return {@code true} if warn logging is enabled, {@code false} otherwise.
     */
    boolean isWarnEnabled();

    /**
     * Emits the specified message.
     * 
     * @param msg The message to log, must not be {@code null}.
     */
    void warn( String msg );

    /**
     * Emits the specified message along with a stack trace of the given exception.
     * 
     * @param msg The message to log, must not be {@code null}.
     * @param error The exception to log, may be {@code null}.
     */
    void warn( String msg, Throwable error );

}