Cache the signature placeholder

1 files changed, 112 insertions, 0 deletions

diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SignaturePlaceholderCache.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SignaturePlaceholderCache.java
new file mode 100644
index 00000000..769c477b
--- /dev/null
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SignaturePlaceholderCache.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://joinup.ec.europa.eu/software/page/eupl
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ */
+package at.asit.pdfover.gui.utils;
+
+// Imports
+import java.awt.Image;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Properties;
+
+import javax.imageio.ImageIO;
+
+import org.eclipse.swt.graphics.ImageData;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.asit.pdfover.gui.Constants;
+import at.asit.pdfover.signator.SignatureParameter;
+
+/**
+ * 
+ */
+public class SignaturePlaceholderCache {
+	/**
+	 * SLF4J Logger instance
+	 **/
+	private static final Logger log = LoggerFactory
+			.getLogger(SignaturePlaceholderCache.class);
+
+	private static void saveImage(BufferedImage image, String fileDir, String fileName, String fileExt) throws IOException {
+		File file = new File(fileDir, fileName + "." + fileExt); //$NON-NLS-1$
+		ImageIO.write(image, fileExt, file); // ignore returned boolean
+	}
+
+	private static Image loadImage(String fileDir, String fileName, String fileExt) throws IOException {
+		return ImageIO.read(new File(fileDir, fileName + "." + fileExt)); //$NON-NLS-1$
+	}
+
+	/**
+	 * Get placeholder as AWT Image
+	 * @param param SignatureParameter
+	 * @return the placeholder AWT Image
+	 */
+	public static Image getPlaceholder(SignatureParameter param) {
+		final String fileDir = Constants.CONFIG_DIRECTORY;
+		final String imgFileName = Constants.PLACEHOLDER_CACHE_FILENAME;
+		final String imgFileExt = "png"; //$NON-NLS-1$
+		final String propFileName = Constants.PLACEHOLDER_CACHE_PROPS_FILENAME;
+
+		final String sigLangProp = "LANG"; //$NON-NLS-1$
+		final String sigEmblProp = "EMBL"; //$NON-NLS-1$
+		final String sigNoteProp = "NOTE"; //$NON-NLS-1$
+		String sigLang = param.getSignatureLanguage();
+		String sigEmbl = (param.getEmblem() == null ? "" : param.getEmblem().getFileName()); //$NON-NLS-1$
+		String sigNote = param.getProperty("SIG_NOTE"); //$NON-NLS-1$
+
+		Properties sigProps = new Properties();
+		// compare cache, try to load if match
+		try {
+			InputStream in = new FileInputStream(new File(fileDir, propFileName));
+			sigProps.load(in);
+			if (sigProps.getProperty(sigLangProp).equals(sigLang) &&
+			    sigProps.getProperty(sigEmblProp).equals(sigEmbl) &&
+			    sigProps.getProperty(sigNoteProp).equals(sigNote))
+				return loadImage(fileDir, imgFileName, imgFileExt);
+		} catch (Exception e) {
+			log.debug("Can't load signature Placeholder", e); //$NON-NLS-1$
+		}
+
+		// create new cache
+		try {
+			sigProps.setProperty(sigLangProp, sigLang);
+			sigProps.setProperty(sigEmblProp, sigEmbl);
+			sigProps.setProperty(sigNoteProp, sigNote);
+			OutputStream out = new FileOutputStream(new File(fileDir, propFileName));
+			sigProps.store(out, null);
+			Image img = param.getPlaceholder();
+			saveImage((BufferedImage) img, fileDir, imgFileName, imgFileExt);
+			return img;
+		} catch (IOException e) {
+			log.error("Can't save signature Placeholder", e); //$NON-NLS-1$
+			return param.getPlaceholder();
+		}
+	}
+
+	/**
+	 * Get placeholder as SWT ImageData
+	 * @param param SignatureParameter
+	 * @return the placeholder SWT ImageData
+	 */
+	public static ImageData getSWTPlaceholder(SignatureParameter param) {
+		return ImageConverter.convertToSWT((BufferedImage) getPlaceholder(param));
+	}
+}