com.lowagie.text.html.HtmlEncoder Maven / Gradle / Ivy
/*
* $Id: HtmlEncoder.java 3373 2008-05-12 16:21:24Z xlv $
*
* Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* https://github.com/LibrePDF/OpenPDF
*/
package com.lowagie.text.html;
import com.lowagie.text.Element;
import java.awt.Color;
/**
* This class converts a String to the HTML-format of a String.
*
* To convert the String, each character is examined:
*
* - ASCII-characters from 000 till 031 are represented as &#xxx;
* (with xxx = the value of the character)
* - ASCII-characters from 032 t/m 127 are represented by the character itself, except for:
*
* - '\n' becomes <BR>\n
*
- " becomes "
*
- & becomes &
*
- < becomes <
*
- > becomes >
*
* - ASCII-characters from 128 till 255 are represented as &#xxx;
* (with xxx = the value of the character)
*
*
* Example:
*
*
* String htmlPresentation = HtmlEncoder.encode("Marie-Thérèse Sørensen");
*
*
* for more info: see O'Reilly; "HTML: The Definitive Guide" (page 164)
*
*
* @author [email protected]
*/
public final class HtmlEncoder {
// membervariables
/**
* List with the HTML translation of all the characters.
*/
private static final String[] htmlCode = new String[256];
static {
for (int i = 0; i < 10; i++) {
htmlCode[i] = "�" + i + ";";
}
for (int i = 10; i < 32; i++) {
htmlCode[i] = "�" + i + ";";
}
for (int i = 32; i < 128; i++) {
htmlCode[i] = String.valueOf((char) i);
}
// Special characters
htmlCode['\t'] = "\t";
htmlCode['\n'] = "<" + HtmlTags.NEWLINE + " />\n";
htmlCode['\"'] = """; // double quote
htmlCode['&'] = "&"; // ampersand
htmlCode['<'] = "<"; // lower than
htmlCode['>'] = ">"; // greater than
for (int i = 128; i < 256; i++) {
htmlCode[i] = "&#" + i + ";";
}
}
// constructors
/**
* This class will never be constructed.
*
* HtmlEncoder only contains static methods.
*/
private HtmlEncoder() {
}
// methods
/**
* Converts a String to the HTML-format of this String.
*
* @param string The String to convert
* @return a String
*/
public static String encode(String string) {
int n = string.length();
char character;
StringBuilder buffer = new StringBuilder();
// loop over all the characters of the String.
for (int i = 0; i < n; i++) {
character = string.charAt(i);
// the Htmlcode of these characters are added to a StringBuffer one by one
if (character < 256) {
buffer.append(htmlCode[character]);
} else {
// Improvement posted by Joachim Eyrich
buffer.append("&#").append((int) character).append(';');
}
}
return buffer.toString();
}
/**
* Converts a Color into a HTML representation of this Color.
*
* @param color the Color that has to be converted.
* @return the HTML representation of this Color
*/
public static String encode(Color color) {
StringBuilder buffer = new StringBuilder("#");
if (color.getRed() < 16) {
buffer.append('0');
}
buffer.append(Integer.toString(color.getRed(), 16));
if (color.getGreen() < 16) {
buffer.append('0');
}
buffer.append(Integer.toString(color.getGreen(), 16));
if (color.getBlue() < 16) {
buffer.append('0');
}
buffer.append(Integer.toString(color.getBlue(), 16));
return buffer.toString();
}
/**
* Translates the alignment value.
*
* @param alignment the alignment value
* @return the translated value
*/
public static String getAlignment(int alignment) {
switch (alignment) {
case Element.ALIGN_LEFT:
return HtmlTags.ALIGN_LEFT;
case Element.ALIGN_CENTER:
return HtmlTags.ALIGN_CENTER;
case Element.ALIGN_RIGHT:
return HtmlTags.ALIGN_RIGHT;
case Element.ALIGN_JUSTIFIED:
case Element.ALIGN_JUSTIFIED_ALL:
return HtmlTags.ALIGN_JUSTIFIED;
case Element.ALIGN_TOP:
return HtmlTags.ALIGN_TOP;
case Element.ALIGN_MIDDLE:
return HtmlTags.ALIGN_MIDDLE;
case Element.ALIGN_BOTTOM:
return HtmlTags.ALIGN_BOTTOM;
case Element.ALIGN_BASELINE:
return HtmlTags.ALIGN_BASELINE;
default:
return "";
}
}
}