net.sf.nervalreports.converters.FSHTMLToPDFConverter Maven / Gradle / Ivy

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/** This file is part of nervalreports.
 *
 * nervalreports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * nervalreports 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with nervalreports.  If not, see . */
package net.sf.nervalreports.converters;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.Charset;

import org.xhtmlrenderer.pdf.ITextRenderer;

import com.lowagie.text.DocumentException;

import net.sf.nervalreports.core.TextualFileConverter;

/** Converter from HTML to PDF using the FlyingSaucer library (http://github.com/flyingsaucerproject/flyingsaucer). */
public class FSHTMLToPDFConverter extends TextualFileConverter {
	
	/** The single instance of the converter. */
	private static final FSHTMLToPDFConverter INSTANCE = new FSHTMLToPDFConverter();
	
	/** target file format */
	private static final String TARGET_FILE_FORMAT = "pdf";
	
	/** Content type (to use as servlet response) of output file. */
	   private static final String CONTENT_TYPE = "application/pdf";
	
	private FSHTMLToPDFConverter() {
	}
	
	/** @return the single instance of {@link FSHTMLToPDFConverter}. */
	public static FSHTMLToPDFConverter getInstance() {
		return INSTANCE;
	}

	/** {@inheritDoc} */
	@Override
	public byte[] doConvert(String html, Charset charset) throws IOException, DocumentException {
		if (html != null) {
			try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
				ITextRenderer renderer = new ITextRenderer();
				renderer.setDocumentFromString(html);
				renderer.layout();
				renderer.createPDF(outputStream);
				return outputStream.toByteArray();
			}
		}
		return null;
	}

	/** {@inheritDoc} */
	@Override
	public String getContentType() {
		return CONTENT_TYPE;
	}

	/** {@inheritDoc} */
	@Override
	public String getFileExtension() {
		return TARGET_FILE_FORMAT;
	}

}