Tomcat example source code file (Txt2Html.java)

This example Tomcat source code file (Txt2Html.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

bufferedreader, bufferedreader, buildexception, file, file, filereader, fileset, io, ioexception, ioexception, printwriter, string, string, stringbuffer, task, util

The Tomcat Txt2Html.java source code

/*
* 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
*
*     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.tomcat.buildutil;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.FileSet;

/**
 * Ant task to convert a given set of files from Text to HTML.
 * Inserts an HTML header including pre tags and replaces special characters
 * with their HTML escaped equivalents.
 *
 * <p>This task is currently used by the ant script to build our examples

 *
 * @author Mark Roth
 */
public class Txt2Html 
    extends Task 
{
    
    /** The directory to contain the resulting files */
    private File todir;
    
    /** The file to be converted into HTML */
    private List<FileSet> filesets = new LinkedList();
    
    /**
     * Sets the directory to contain the resulting files
     *
     * @param todir The directory
     */
    public void setTodir( File todir ) {
        this.todir = todir;
    }
    
    /**
     * Sets the files to be converted into HTML
     *
     * @param fileset The fileset to be converted.
     */
    public void addFileset( FileSet fs ) {
        filesets.add( fs );
    }
    
    /**
     * Perform the conversion
     *
     * @param BuildException Thrown if an error occurs during execution of
     *    this task.
     */
    public void execute() 
        throws BuildException 
    {
        int count = 0;
        
        // Step through each file and convert.
        Iterator iter = filesets.iterator();
        while( iter.hasNext() ) {
            FileSet fs = (FileSet)iter.next();
            DirectoryScanner ds = fs.getDirectoryScanner( project );
            File basedir = ds.getBasedir();
            String[] files = ds.getIncludedFiles();
            for( int i = 0; i < files.length; i++ ) {
                File from = new File( basedir, files[i] );
                File to = new File( todir, files[i] + ".html" );
                if( !to.exists() || 
                    (from.lastModified() > to.lastModified()) ) 
                {
                    log( "Converting file '" + from.getAbsolutePath() + 
                        "' to '" + to.getAbsolutePath(), Project.MSG_VERBOSE );
                    try {
                        convert( from, to );
                    }
                    catch( IOException e ) {
                        throw new BuildException( "Could not convert '" + 
                            from.getAbsolutePath() + "' to '" + 
                            to.getAbsolutePath() + "'", e );
                    }
                    count++;
                }
            }
            if( count > 0 ) {
                log( "Converted " + count + " file" + (count > 1 ? "s" : "") + 
                    " to " + todir.getAbsolutePath() );
            }
        }
    }
    
    /**
     * Perform the actual copy and conversion
     *
     * @param from The input file
     * @param to The output file
     * @throws IOException Thrown if an error occurs during the conversion
     */
    private void convert( File from, File to )
        throws IOException
    {
        // Open files:
        BufferedReader in = new BufferedReader( new FileReader( from ) );
        PrintWriter out = new PrintWriter( new FileWriter( to ) );
        
        // Output header:
        out.println( "<html>
" );
        
        // Convert, line-by-line:
        String line;
        while( (line = in.readLine()) != null ) {
            StringBuffer result = new StringBuffer();
            int len = line.length();
            for( int i = 0; i < len; i++ ) {
                char c = line.charAt( i );
                switch( c ) {
                    case '&':
                        result.append( "&" );
                        break;
                    case '<':
                        result.append( "<" );
                        break;
                    default:
                        result.append( c );
                }
            }
            out.println( result.toString() );
        }
        
        // Output footer:
        out.println( "</pre>" );
        
        // Close streams:
        out.close();
        in.close();
    }
    
}




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