Cache the signature placeholder

4 files changed, 123 insertions, 6 deletions

diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/Constants.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/Constants.java
index 67d30f01..d2d285c1 100644
--- a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/Constants.java
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/Constants.java
@@ -62,6 +62,12 @@ public class Constants {
 	/** The configuration version file name */
 	public static final String CONFIG_VERSION_FILENAME = ".version"; //$NON-NLS-1$
 
+	/** The signature placeholder cache file name */
+	public static final String PLACEHOLDER_CACHE_FILENAME = ".placeholder"; //$NON-NLS-1$
+
+	/** The signature placeholder cache properties file name */
+	public static final String PLACEHOLDER_CACHE_PROPS_FILENAME = ".placeholder.properties"; //$NON-NLS-1$
+
 	/** The minimum PDF-AS configuration version (older ones will be backed up and updated */
 	public static final String MIN_PDF_AS_CONFIG_VERSION = "4.1.0"; //$NON-NLS-1$
 
diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/SimpleConfigurationComposite.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/SimpleConfigurationComposite.java
index eccda66c..a5e0461e 100644
--- a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/SimpleConfigurationComposite.java
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/composites/SimpleConfigurationComposite.java
@@ -65,6 +65,7 @@ import at.asit.pdfover.gui.controls.Dialog.BUTTONS;
 import at.asit.pdfover.gui.exceptions.InvalidNumberException;
 import at.asit.pdfover.gui.utils.ImageConverter;
 import at.asit.pdfover.gui.utils.Messages;
+import at.asit.pdfover.gui.utils.SignaturePlaceholderCache;
 import at.asit.pdfover.gui.workflow.config.ConfigurationContainer;
 import at.asit.pdfover.gui.workflow.states.State;
 import at.asit.pdfover.signator.FileNameEmblem;
@@ -673,9 +674,7 @@ public class SimpleConfigurationComposite extends BaseConfigurationComposite {
 					
 					param.setSignatureLanguage(this.configurationContainer.getSignLocale().getLanguage());
 					
-					img = ImageConverter
-							.convertToSWT((BufferedImage) param
-									.getPlaceholder());
+					img = SignaturePlaceholderCache.getSWTPlaceholder(param);
 				}
 			} else {
 				if (this.signer != null) {
@@ -687,8 +686,7 @@ public class SimpleConfigurationComposite extends BaseConfigurationComposite {
 					
 					param.setSignatureLanguage(this.configurationContainer.getSignLocale().getLanguage());
 					param.setEmblem(new FileNameEmblem(image));
-					img = ImageConverter.convertToSWT((BufferedImage) param
-							.getPlaceholder());
+					img = SignaturePlaceholderCache.getSWTPlaceholder(param);
 				} else {
 					img = new ImageData(image);
 				}
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));
+	}
+}
diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/workflow/states/PositioningState.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/workflow/states/PositioningState.java
index fed293fc..6c3d11a8 100644
--- a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/workflow/states/PositioningState.java
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/workflow/states/PositioningState.java
@@ -32,6 +32,7 @@ import at.asit.pdfover.gui.composites.PositioningComposite;
 import at.asit.pdfover.gui.controls.Dialog.BUTTONS;
 import at.asit.pdfover.gui.controls.ErrorDialog;
 import at.asit.pdfover.gui.utils.Messages;
+import at.asit.pdfover.gui.utils.SignaturePlaceholderCache;
 import at.asit.pdfover.gui.workflow.StateMachine;
 import at.asit.pdfover.gui.workflow.Status;
 import at.asit.pdfover.signator.Emblem;
@@ -109,7 +110,7 @@ public class PositioningState extends State {
 		param.setSignatureLanguage(getStateMachine().getConfigProvider().getSignLocale().getLanguage());
 		
 		this.positionComposite.setPlaceholder(
-				param.getPlaceholder(),
+				SignaturePlaceholderCache.getPlaceholder(param),
 				param.getPlaceholderDimension().getWidth(),
 				param.getPlaceholderDimension().getHeight(),
 				getStateMachine().getConfigProvider().getPlaceholderTransparency());