Quelle Txt2Html.java Sprache: JAVA

/*
* 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.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
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</p>
*
* @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 final List<FileSet> filesets = new ArrayList<>();

    /**
     * The encoding of the source files (.java and .jsp).  Once they use
     * UTF-8, this will need to be updated.
     */
    private static final String SOURCE_ENCODING = "ISO-8859-1";

    /**
     * Line terminator to be used for separating lines of the generated
     * HTML page, to be independent from "line.separator" system property.
     */
    private static final String LINE_SEPARATOR = "\r\n";

    /**
     * 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 fs The fileset to be converted.
     */
    public void addFileset( FileSet fs ) {
        filesets.add( fs );
    }

    /**
     * Perform the conversion
     *
     * @throws BuildException if an error occurs during execution of
     *    this task.
     */
    @Override
    public void execute()
        throws BuildException
    {
        int count = 0;

        // Step through each file and convert.
        for (FileSet fs : filesets) {
            DirectoryScanner ds = fs.getDirectoryScanner(getProject());
            File basedir = ds.getBasedir();
            String[] files = ds.getIncludedFiles();
            for (String file : files) {
                File from = new File(basedir, file);
                File to = new File(todir, file + ".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:
        try (BufferedReader in = new BufferedReader(new InputStreamReader(
                new FileInputStream(from), SOURCE_ENCODING))) {
            try (PrintWriter out = new PrintWriter(new OutputStreamWriter(
                    new FileOutputStream(to), "UTF-8"))) {

                // Output header:
                out.print("UTF-8\" />"
                        + "Source Code

" );



                // Convert, line-by-line:

                String line;

                while( (line = in.readLine()) != null ) {

                    StringBuilder result = new StringBuilder();

                    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.print( result.toString() + LINE_SEPARATOR );

                }



                // Output footer:

                out.print( "

" );

            }
        }
    }

}

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