/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */
package com.sun.appserv.management.util.misc;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.io.FileNotFoundException;

/**
	Directs output to a file. Lazy initialization; the file
	is not actually opened until output is sent.
 */
public final class FileOutput implements Output
{
    private PrintStream mOut;
    private final File  mFile;
    private final boolean  mAppend;
    
		public
	FileOutput( final File f )
	{
	    this( f, false );
	}
	
		public
	FileOutput( final File f, boolean append )
	{
	    mOut    = null;
	    mFile   = f;
	    mAppend = append;
	}
	
	    private void
	lazyInit()
	{
	    if ( mOut == null ) synchronized( this )
	    {
    	    if ( mOut == null )
    	    {
    	        try
    	        {
                    if ( (! mAppend) && mFile.exists() )
                    {
                        mFile.delete();
                    }
                
    	            mOut    = new PrintStream( new FileOutputStream( mFile, mAppend) );
    	        }
    	        catch( Exception e )
    	        {
    	            // don't use System.out/err; possible infinite recursion
    	            throw new RuntimeException( "Can't create file: " + mFile +
    	                ", exception = " + e );
    	        }
    	    }
    	}
	}
	
		public void
	print( final Object o )
	{
	    lazyInit();
	    mOut.print( o.toString() );
	}
	
		public void
	println( Object o )
	{
	    lazyInit();
	    mOut.println( o.toString() );
	}
	
		public void
	printError( final Object o )
	{
	    lazyInit();
	    println( "ERROR: " + o );
	}
	
		public boolean
	getDebug()
	{
	    lazyInit();
		return( false );
	}
	
		public void
	printDebug( final Object o )
	{
	    lazyInit();
	    println( "DEBUG: " + o );
	}
	
	
		public void
	close( )
	{
	    if ( mOut != null )
	    {
    	    try
    	    {
    	        mOut.close();
    	    }
    	    finally
    	    {
    	        mOut    = null;
    	    }
	    }
	}
};