Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.CharBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final String whitespace = "[ \\t\\n\\r\\f\\v]*";
    private static final String titleTag = "[Tt][Ii][Tt][Ll][Ee]";
    private static Pattern titlePattern = null;

    public static String findTitle(File f) {
        if (titlePattern == null) {
            initPattern();
        }

        try {
            FileChannel fc = new FileInputStream(f).getChannel();

            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());

            CharBuffer cb = Charset.forName("8859_1").newDecoder().decode(bb); //$NON-NLS-1$

            Matcher m = titlePattern.matcher(cb);
            String title = null;
            if (m.find()) {
                title = m.group(1);
            }

            return title;
        } catch (IOException e) {
            return null;
        }
    }

    private static void initPattern() {
        StringBuffer buf = new StringBuffer();
        buf.append('<');
        buf.append(whitespace);
        buf.append(titleTag);
        buf.append('>');
        buf.append("(.*?)"); //$NON-NLS-1$
        buf.append('<');
        buf.append(whitespace);
        buf.append('/');
        buf.append(whitespace);
        buf.append(titleTag);
        buf.append('>');

        titlePattern = Pattern.compile(buf.toString());
    }
}