1 files changed, 146 insertions, 0 deletions
diff --git a/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/sig/SignatureSeparator.java b/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/sig/SignatureSeparator.java
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+++ b/pdf-as-lib/src/main/java/at/knowcenter/wag/egov/egiz/sig/SignatureSeparator.java
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+/**
+ * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
+ * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
+ * joint initiative of the Federal Chancellery Austria and Graz University of
+ * Technology.
+ *
+ * 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://www.osor.eu/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.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ *
+ * $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.
+ * @deprecated This process of separating signature blocks is obsolete - use AbsoluteTextSignature etc. instead.
+ */
+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_;
+  }
+}
+\ No newline at end of file