org.jpedal.io.JAIHelper Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of jsign-jpedal Show documentation
JPedal fork
The newest version!
/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/java-pdf-library-support/
 *
 * (C) Copyright 1997-2013, IDRsolutions and Contributors.
 *
 * 	This file is part of JPedal
 *
     This library 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 2.1 of the License, or (at your option) 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 *
 * ---------------
 * JAIHelper.java
 * ---------------
 */
package org.jpedal.io;

import java.io.IOException;

import javax.swing.JEditorPane;
import javax.swing.JOptionPane;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

import org.jpedal.PdfDecoder;
import org.jpedal.utils.BrowserLauncher;
import org.jpedal.utils.LogWriter;
import org.jpedal.utils.Messages;

public class JAIHelper {

	private static boolean JAI_TESTED;

	private static boolean useJAI = false;

	private static boolean isJAIFound = false;

	static {
		String JAIflag = System.getProperty("org.jpedal.jai");
		if (JAIflag != null && JAIflag.toLowerCase().equals("true")) useJAI = true;
	}

	public static void confirmJAIOnClasspath() {

		if (JAI_TESTED) return;

		JAIHelper.JAI_TESTED = true;

		if (useJAI) {

			// test
			try {
				Class.forName("javax.media.jai.JAI");
				isJAIFound = true;
			}
			catch (ClassNotFoundException e) {
				if (PdfDecoder.showErrorMessages) {

					String message = Messages.getMessage("PdfViewer.JAINotOnClasspathWarning")
							+ Messages.getMessage("PdfViewer.JAINotOnClasspathWarning1") + Messages.getMessage("PdfViewer.JAINotOnClasspathWarning2");

					// hack for tableZoner
					if (message.contains("PdfViewer")) message = "We recommend you add JAI to classpath";

					JEditorPane p = new JEditorPane("text/html", message);
					p.setEditable(false);
					p.setOpaque(false);
					p.addHyperlinkListener(new HyperlinkListener() {
						@Override
						public void hyperlinkUpdate(HyperlinkEvent e) {
							if (e.getEventType().equals(HyperlinkEvent.EventType.ACTIVATED)) {
								try {
									BrowserLauncher.openURL("http://java.sun.com/products/java-media/jai/current.html");
								}
								catch (IOException e1) {
									if (PdfDecoder.showErrorMessages) JOptionPane.showMessageDialog(null,
											Messages.getMessage("PdfViewer.ErrorWebsite"));
									// tell user and log
									if (LogWriter.isOutput()) LogWriter.writeLog("Exception: " + e1.getMessage());
								}
							}
						}
					});

					if (PdfDecoder.showErrorMessages) JOptionPane.showMessageDialog(null, p);
				}
			}
		}
	}

	public static boolean isJAIused() {
		return useJAI;
	}

	public static boolean isJAIOnClasspath() {

		if (!isJAIFound) { // already found so just return

			// test
			String classpath = System.getProperty("java.class.path");
			if (classpath.contains("jai")) isJAIFound = true;

		}

		return isJAIFound;
	}

	public static void useJAI(boolean use) {
		useJAI = use;
		JAI_TESTED = false; // make sure retested
	}
}