/*
 * Copyright 1999,2004 The Apache Software Foundation.
 * 
 * Licensed 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
 * 
 *      http://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.catalina.ssi;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import org.apache.catalina.util.DateTool;
import org.apache.catalina.util.Strftime;

/**
 * Implements the Server-side #flastmod command
 *
 * @author Bip Thelin
 * @author Dan Sandberg
 * @version $Revision$, $Date$
 */
public final class SSIFlastmod implements SSICommand {
    /**
     * @see SSICommand
     */
    public void process(SSIMediator ssiMediator,
			String[] paramNames,
			String[] paramValues,
			PrintWriter writer) {

	String configErrMsg = ssiMediator.getConfigErrMsg();
	StringBuffer buf = new StringBuffer();

        for(int i=0;i<paramNames.length;i++) {
	    String paramName = paramNames[i];
	    String paramValue = paramValues[i];

	    try {
		if ( paramName.equalsIgnoreCase("file") ||
		     paramName.equalsIgnoreCase("virtual") ) {
		    boolean virtual = paramName.equalsIgnoreCase("virtual");
		    long lastModified = ssiMediator.getFileLastModified( paramValue,  virtual );
		    Date date = new Date( lastModified );
		    String configTimeFmt = ssiMediator.getConfigTimeFmt();
		    writer.write( formatDate(date, configTimeFmt ) );
		} else {
		    ssiMediator.log("#flastmod--Invalid attribute: " + paramName );
		    writer.write( configErrMsg );
		}	    
	    } catch ( IOException e ) {
		ssiMediator.log("#flastmod--Couldn't get last modified for file: " + paramValue, e );
		writer.write( configErrMsg );
	    }
	}
    }

    protected String formatDate( Date date, String configTimeFmt ) {
	Strftime strftime = new Strftime( configTimeFmt, DateTool.LOCALE_US );
	return strftime.format( date );
    }
}