src/main/org/apache/tools/ant/BuildLogger.java

/*
 * The Apache Software License, Version 1.1
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 * reserved.
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 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
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 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
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 */

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 <code>System.out</code> unless redirected by 
 * the <code>-logfile</code> option.
 *
 * @author Conor MacNeill
 */
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.
     * <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.
     *
     * @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.
     *
     * @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.
     *
     * @param err The error stream for the logger.
     *            Must not be <code>null</code>.
     */
    void setErrorPrintStream(PrintStream err);    
}