antliscence/src/main/org/apache/tools/ant/ProjectComponent.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001,2002 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
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 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    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,
 *    if and wherever such third-party acknowlegements normally appear.
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 * 4. The names "Ant" and "Apache Software
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.tools.ant;

/**
 * Base class for components of a project, including tasks and data types.
 * Provides common facilities.
 *
 * @author Conor MacNeill
 */
public abstract class ProjectComponent {

    /**
     * Project object of this component.
     * @deprecated You should not be directly accessing this variable
     *   directly. You should access project object via the getProject()
     *   or setProject() accessor/mutators.
     */
    protected Project project;

    /** Sole constructor. */
    public ProjectComponent() {
    }

    /**
     * Sets the project object of this component. This method is used by
     * Project when a component is added to it so that the component has
     * access to the functions of the project. It should not be used
     * for any other purpose.
     *
     * @param project Project in whose scope this component belongs.
     *                Must not be <code>null</code>.
     */
    public void setProject(Project project) {
        this.project = project;
    }

    /**
     * Returns the project to which this component belongs.
     *
     * @return the components's project.
     */
    public Project getProject() {
        return project;
    }
    
    /**
     * Logs a message with the default (INFO) priority.
     *
     * @param msg The message to be logged. Should not be <code>null</code>.
     */
    public void log(String msg) {
        log(msg, Project.MSG_INFO);
    }

    /**
     * Logs a mesage with the given priority.
     *
     * @param msg The message to be logged. Should not be <code>null</code>.
     * @param msgLevel the message priority at which this message is 
     *                 to be logged.
     */
    public void log(String msg, int msgLevel) {
        if (project != null) {
            project.log(msg, msgLevel);
        } else {
            // 'reasonable' default, if the component is used without
            // a Project ( for example as a standalone Bean ).
            // Most ant components can be used this way.
            if( msgLevel >= Project.MSG_INFO )
                System.err.println( msg );
        }
    }
}