1 files changed, 170 insertions, 0 deletions
diff --git a/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFSignatureCreation.java b/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFSignatureCreation.java
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@@ -0,0 +1,170 @@
+/*
+ * <copyright>
+ *  Copyright (c) 2006 by Know-Center, Graz, Austria
+ * </copyright>
+ *
+ *  This software is the confidential and proprietary information of Know-Center,
+ *  Graz, Austria. You shall not disclose such Confidential Information and shall 
+ *  use it only in accordance with the terms of the license agreement you entered 
+ *  into with Know-Center.
+ *
+ *  KNOW-CENTER MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
+ *  SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+ *  IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, 
+ *  OR NON-INFRINGEMENT. KNOW-CENTER SHALL NOT BE LIABLE FOR ANY DAMAGES
+ *  SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
+ *  THIS SOFTWARE OR ITS DERIVATIVES.
+ * 
+ * $Id: PDFSignatureCreation.java,v 1.6 2006/10/31 08:09:33 wprinz Exp $
+ */
+package at.knowcenter.wag.egov.egiz.pdf;
+
+import org.apache.log4j.Level;
+import org.apache.log4j.Logger;
+
+import at.knowcenter.wag.egov.egiz.cfg.ConfigLogger;
+import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;
+import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;
+import at.knowcenter.wag.egov.egiz.exceptions.SettingsException;
+import at.knowcenter.wag.egov.egiz.sig.SignatureObject;
+
+/**
+ * This class provides wrapper methods to get an access to abstract PDF documents (PDFSignator).
+ * There exists many open source libraries and commercial libraries that can implement the abstract
+ * interface. <br>
+ * This class is to load the corresponding implementation of an abstract PDFSignator class. Therefor
+ * it seams to be a factory. The factory settings are read from the configuration file calling the
+ * SettingsReader.
+ * 
+ * @author wlackner
+ * @see at.knowcenter.wag.egov.egiz.cfg.SettingsReader
+ */
+public class PDFSignatureCreation {
+  /**
+   * The abstract signature object
+   */
+  private SignatureObject sigObject_ = null;
+  /**
+   * The abstract pdf siganture object
+   */
+  private PDFSignatureObject pdfSigObject_ = null;
+  /**
+   * The SettingsReader instance
+   */
+  private SettingsReader settings_ = null;
+  /**
+   * The factory class prefix
+   */
+  private final static String CLASS_PREFIX = ".PDFSignatureObject";
+  /**
+   * The factory class prefix of the default library
+   */
+  protected final static String DEFAULT_LIBRARY = "IText";
+  /**
+   * The settings key defined in the settings file
+   * 
+   * @see SettingsReader
+   */
+  protected final static String SETTINGS_KEY = "pdf.signature.library";
+  /**
+   * The logger definition.
+   */
+  private static final Logger logger_ = ConfigLogger.getLogger(PDFSignatureCreation.class);
+
+  /**
+   * Load the configuration settings. Load the corresponding class implementation for the abstract
+   * PDFSignature class. Init with a signature object.
+   * 
+   * @param sigObject the native signature object
+   * @throws PDFDocumentException ErrorCode:101
+   */
+  public PDFSignatureCreation(SignatureObject sigObject) throws PDFDocumentException {
+    try {
+      loadSettings();
+    } catch (PDFDocumentException e) {
+      e.setErrorCode(101);
+      throw e;
+    }
+    sigObject_ = sigObject;
+  }
+
+  /**
+   * Load the factory implementation. This method trys to load the configured PDF library.
+   * 
+   * @throws PDFDocumentException
+   */
+  private PDFSignatureObject createPDFSignatureObject() throws PDFDocumentException {
+    PDFSignatureObject pdf_sig_object = null;
+    String class_name = this.getClass().getPackage().getName() + getClassName();
+    Class pdf_sig_obj_class = null;
+    try {
+      pdf_sig_obj_class = Class.forName(class_name);
+    } catch (ClassNotFoundException e) {
+      if (logger_.isEnabledFor(Level.FATAL)) {
+        logger_.fatal("Class not found:" + class_name);
+      }
+      throw new PDFDocumentException(203, "Can not load pdf signator library", e);
+    }
+    try {
+      pdf_sig_object = (PDFSignatureObject) pdf_sig_obj_class.newInstance();
+    } catch (InstantiationException e) {
+      if (logger_.isEnabledFor(Level.FATAL)) {
+        logger_.fatal("Can not instantiate:" + class_name);
+      }
+      throw new PDFDocumentException(203, "Can not load pdf signator library", e);
+    } catch (IllegalAccessException e) {
+      if (logger_.isEnabledFor(Level.FATAL)) {
+        logger_.fatal("Can not access:" + class_name);
+      }
+      throw new PDFDocumentException(203, "Can not load pdf signator library", e);
+    }
+    return pdf_sig_object;
+  }
+
+  /**
+   * load the class settings
+   * 
+   * @throws PDFDocumentException
+   * @see SettingsReader
+   */
+  private void loadSettings() throws PDFDocumentException {
+    if (settings_ == null) {
+      try {
+        settings_ = SettingsReader.getInstance();
+      } catch (SettingsException e) {
+        String log_message = "Can not load pdf signature settings. Cause:\n" + e.getMessage();
+        logger_.error(log_message);
+        throw new PDFDocumentException(101, log_message, e);
+      }
+    }
+  }
+
+  /**
+   * Read the class postfix from the configuration file
+   * 
+   * @return the full qualified class name
+   */
+  private String getClassName() {
+    String extract_class = settings_.getSetting(SETTINGS_KEY, DEFAULT_LIBRARY);
+    return CLASS_PREFIX + extract_class;
+  }
+
+  /**
+   * Creates a new pdf signature object using the configured pdf library.
+   * 
+   * @return a new pdf signature object
+   * @throws PDFDocumentException ErrorCode:203
+   */
+  public PDFSignatureObject getPDFSignatureObject() throws PDFDocumentException {
+    if (pdfSigObject_ == null) {
+      try {
+        pdfSigObject_ = createPDFSignatureObject();
+      } catch (PDFDocumentException e) {
+        e.setErrorCode(203);
+        throw e;
+      }
+      pdfSigObject_.setSignatorObject(sigObject_);
+    }
+    return pdfSigObject_;
+  }
+}
+\ No newline at end of file