📄 pdftext2html.java
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/**
* Copyright (c) 2003-2004, www.pdfbox.org
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of pdfbox; nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* http://www.pdfbox.org
*
*/
package org.pdfbox.util;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import org.pdfbox.pdmodel.PDDocument;
/**
* Wrap stripped text in simple HTML, trying to form HTML paragraphs.
* Paragraphs broken by pages, columns, or figures are not mended.
*
*
* @author jjb - http://www.johnjbarton.com
* @version $Revision: 1.3 $
*/
public class PDFText2HTML extends PDFTextStripper
{
private static final int INITIAL_PDF_TO_HTML_BYTES = 8192;
private TextPosition beginTitle;
private TextPosition afterEndTitle;
private String titleGuess;
private boolean suppressParagraphs;
private boolean onFirstPage = true;
/**
* Constructor.
*
* @throws IOException If there is an error during initialization.
*/
public PDFText2HTML() throws IOException
{
titleGuess = "";
beginTitle = null;
afterEndTitle = null;
suppressParagraphs = false;
}
/**
* Write the header to the output document.
*
* @throws IOException If there is a problem writing out the header to the document.
*/
protected void writeHeader() throws IOException
{
StringBuffer buf = new StringBuffer(INITIAL_PDF_TO_HTML_BYTES);
buf.append("<html><head>");
buf.append("<title>");
buf.append(getTitleGuess());
buf.append("</title>");
buf.append("</head>");
buf.append("<body>\n");
getOutput().write(buf.toString());
}
/**
* The guess to the document title.
*
* @return A string that is the title of this document.
*/
protected String getTitleGuess()
{
return titleGuess;
}
/**
* {@inheritDoc}
*/
protected void flushText() throws IOException
{
Iterator textIter = getCharactersByArticle().iterator();
if (onFirstPage)
{
guessTitle(textIter);
writeHeader();
onFirstPage = false;
}
super.flushText();
}
/**
* {@inheritDoc}
*/
public void endDocument(PDDocument pdf) throws IOException
{
output.write("</body></html>");
}
/**
* This method will attempt to guess the title of the document.
*
* @param textIter The characters on the first page.
* @return The text position that is guessed to be the title.
*/
protected TextPosition guessTitle(Iterator textIter)
{
float lastFontSize = -1.0f;
int stringsInFont = 0;
StringBuffer titleText = new StringBuffer();
while (textIter.hasNext())
{
Iterator textByArticle = ((List)textIter.next()).iterator();
while( textByArticle.hasNext() )
{
TextPosition position = (TextPosition) textByArticle.next();
float currentFontSize = position.getFontSize();
if (currentFontSize != lastFontSize)
{
if (beginTitle != null)
{ // font change in candidate title.
if (stringsInFont == 0)
{
beginTitle = null; // false alarm
titleText.setLength(0);
}
else
{
// had a significant font with some words: call it a title
titleGuess = titleText.toString();
afterEndTitle = position;
return beginTitle;
}
}
else
{ // font change and begin == null
if (currentFontSize > 13.0f)
{ // most body text is 12pt max I guess
beginTitle = position;
}
}
lastFontSize = currentFontSize;
stringsInFont = 0;
}
stringsInFont++;
if (beginTitle != null)
{
titleText.append(position.getCharacter()+" ");
}
}
}
return beginTitle; // null
}
/**
* Write out the paragraph separator.
*
* @throws IOException If there is an error writing to the stream.
*/
protected void startParagraph() throws IOException
{
if (! suppressParagraphs)
{
getOutput().write("<p>");
}
}
/**
* Write out the paragraph separator.
*
* @throws IOException If there is an error writing to the stream.
*/
protected void endParagraph() throws IOException
{
if (! suppressParagraphs)
{
getOutput().write("</p>");
}
}
/**
* {@inheritDoc}
*/
protected void writeCharacters(TextPosition position ) throws IOException
{
if (position == beginTitle)
{
output.write("<H1>");
suppressParagraphs = true;
}
if (position == afterEndTitle)
{
output.write("</H1>"); // end title and start first paragraph
suppressParagraphs = false;
}
String chars = position.getCharacter();
for (int i = 0; i < chars.length(); i++)
{
char c = chars.charAt(i);
if ((c < 32) || (c > 126))
{
int charAsInt = c;
output.write("&#" + charAsInt + ";");
}
else
{
switch (c)
{
case 34:
output.write(""");
break;
case 38:
output.write("&");
break;
case 60:
output.write("<");
break;
case 62:
output.write(">");
break;
default:
output.write(c);
}
}
}
}
/**
* @return Returns the suppressParagraphs.
*/
public boolean isSuppressParagraphs()
{
return suppressParagraphs;
}
/**
* @param shouldSuppressParagraphs The suppressParagraphs to set.
*/
public void setSuppressParagraphs(boolean shouldSuppressParagraphs)
{
this.suppressParagraphs = shouldSuppressParagraphs;
}
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