From 6025b6016517c6d898d8957d1d7e03ba71431912 Mon Sep 17 00:00:00 2001
From: tknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>
Date: Fri, 1 Dec 2006 12:20:24 +0000
Subject: Initial import of release 2.2.

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@4 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c
---
 .../wag/egov/egiz/sig/SignatureSeparator.java      | 139 +++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 src/main/java/at/knowcenter/wag/egov/egiz/sig/SignatureSeparator.java

(limited to 'src/main/java/at/knowcenter/wag/egov/egiz/sig/SignatureSeparator.java')

diff --git a/src/main/java/at/knowcenter/wag/egov/egiz/sig/SignatureSeparator.java b/src/main/java/at/knowcenter/wag/egov/egiz/sig/SignatureSeparator.java
new file mode 100644
index 0000000..3a210fa
--- /dev/null
+++ b/src/main/java/at/knowcenter/wag/egov/egiz/sig/SignatureSeparator.java
@@ -0,0 +1,139 @@
+/*
+ * <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: SignatureSeparator.java,v 1.4 2006/10/31 08:18:56 wprinz Exp $
+ */
+package at.knowcenter.wag.egov.egiz.sig;
+
+import java.util.List;
+import java.util.Stack;
+
+import at.knowcenter.wag.egov.egiz.exceptions.SignatureException;
+import at.knowcenter.wag.egov.egiz.exceptions.SignatureTypesException;
+
+/**
+ * This class separates all signature blocks in a raw text.
+ */
+public class SignatureSeparator {
+  /**
+   * The signature block stack. On top of the stack is the first signature block that can be
+   * extracted. First means nearest to the document text.
+   */
+  private Stack signatureBlocks_ = null;
+  /**
+   * A list of signature type definitions.
+   */
+  private List signatureTypes_ = null;
+  /**
+   * Indicator that shows that a raw text is signated
+   */
+  private boolean hasSignatureBlock_ = false;
+
+  /**
+   * The empty constructor. It loads all signature type infos to extract the signature block from
+   * the raw text.
+   * 
+   * @throws SignatureTypesException
+   */
+  public SignatureSeparator() throws SignatureTypesException {
+    SignatureTypes sig_types = SignatureTypes.getInstance();
+    signatureTypes_ = sig_types.getSignatureTypeDefinitions();
+  }
+
+  /**
+   * This method takes a raw text as input and trys to separate all signature blocks. It returns
+   * true if a signature block is found.
+   * 
+   * @param rawText
+   * @return true if a signature block is found false otherwise
+   */
+  public boolean separateBlock(String rawText) {
+    signatureBlocks_ = new Stack();
+    hasSignatureBlock_ = separateBlock(rawText, rawText.length());
+    return hasSignatureBlock_;
+  }
+
+  /**
+   * This method calls itself rekursively while signature blocks can be extracted. If a signature
+   * block is found (search from the bottom of the raw text) the raw text would be reduced by the
+   * length of the found signature block text.
+   * 
+   * @param rawText the text to be separated
+   * @param endIndex the index to cut the tail from the raw text
+   * @return true if a signature block is found false otherwise
+   */
+  private boolean separateBlock(String rawText, int endIndex) {
+    boolean found = false;
+    boolean can_separate = true;
+    while (can_separate) {
+      SignatureBlock sig_block = new SignatureBlock(signatureTypes_);
+      String raw_text = rawText.substring(0, endIndex);
+      can_separate = sig_block.separateBlockFromRawText(raw_text, true);
+      if (can_separate) {
+        signatureBlocks_.push(sig_block);
+        endIndex = sig_block.getStartIndex();
+        found = true;
+      }
+    }
+    return found;
+  }
+
+  /**
+   * This method returns the start index of the first signature block. It is used to separate the
+   * real document text from the signature block texts.
+   * 
+   * @return the start index of the first signature block
+   */
+  public int getStartIndex() {
+    int start_index = -1;
+    if (signatureBlocks_ != null && signatureBlocks_.size() > 0) {
+      SignatureBlock sig_block = (SignatureBlock) signatureBlocks_.peek();
+      return sig_block.getStartIndex();
+    }
+    return start_index;
+  }
+
+  /**
+   * @return the first found signature object in the given raw text or null if the raw text does not
+   *         contain any signature objects
+   */
+  public SignatureObject getFirstSignatureObject() {
+    if (signatureBlocks_ != null && signatureBlocks_.size() > 0) {
+      SignatureBlock sig_block = (SignatureBlock) signatureBlocks_.peek();
+      try {
+        return sig_block.getSignatureObject();
+      } catch (SignatureException e) {
+        return null;
+      }
+    }
+    return null;
+  }
+
+  /**
+   * @return all separated signature blocks as stack, first is on top
+   */
+  public Stack getSignatureBlocks() {
+    return signatureBlocks_;
+  }
+
+  /**
+   * @return true if a signature block is found false otherwise
+   */
+  public boolean hasSignatureBlock() {
+    return hasSignatureBlock_;
+  }
+}
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