/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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
 *
 *      https://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 org.apache.tools.ant;

import java.io.PrintStream;

Interface used by Ant to log the build output.
A build logger is a build listener which has the 'right' to send output to
the ant log, which is usually System.out unless redirected by
the -logfile option.
/**
 * Interface used by Ant to log the build output.
 *
 * A build logger is a build listener which has the 'right' to send output to
 * the ant log, which is usually <code>System.out</code> unless redirected by
 * the <code>-logfile</code> option.
 *
 */
public interface BuildLogger extends BuildListener {

    
Sets the highest level of message this logger should respond to.
Only messages with a message level lower than or equal to the
given level should be written to the log.
 Constants for the message levels are in the Project class. The order of the levels, from least to most verbose, is MSG_ERR, MSG_WARN,
MSG_INFO, MSG_VERBOSE,
MSG_DEBUG.
Params:
level – the logging level for the logger./**
     * Sets the highest level of message this logger should respond to.
     *
     * Only messages with a message level lower than or equal to the
     * given level should be written to the log.
     * <P>
     * Constants for the message levels are in the
     * {@link Project Project} class. The order of the levels, from least
     * to most verbose, is <code>MSG_ERR</code>, <code>MSG_WARN</code>,
     * <code>MSG_INFO</code>, <code>MSG_VERBOSE</code>,
     * <code>MSG_DEBUG</code>.
     *
     * @param level the logging level for the logger.
     */
    void setMessageOutputLevel(int level);

    
Sets the output stream to which this logger is to send its output.
Params:
output – The output stream for the logger.
              Must not be null./**
     * Sets the output stream to which this logger is to send its output.
     *
     * @param output The output stream for the logger.
     *               Must not be <code>null</code>.
     */
    void setOutputPrintStream(PrintStream output);

    
Sets this logger to produce emacs (and other editor) friendly output.
Params:
emacsMode – true if output is to be unadorned so that
                 emacs and other editors can parse files names, etc./**
     * Sets this logger to produce emacs (and other editor) friendly output.
     *
     * @param emacsMode <code>true</code> if output is to be unadorned so that
     *                  emacs and other editors can parse files names, etc.
     */
    void setEmacsMode(boolean emacsMode);

    
Sets the output stream to which this logger is to send error messages.
Params:
err – The error stream for the logger.
           Must not be null./**
     * Sets the output stream to which this logger is to send error messages.
     *
     * @param err The error stream for the logger.
     *            Must not be <code>null</code>.
     */
    void setErrorPrintStream(PrintStream err);
}