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authortknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>2013-01-09 15:41:29 +0000
committertknall <tknall@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>2013-01-09 15:41:29 +0000
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tree0804f301c1a9ceb303a8441b7b29244fc8eb7ff0 /src/main/java/at/gv/egiz/pdfas/framework/vfilter/VerificationFilterParameters.java
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diff --git a/src/main/java/at/gv/egiz/pdfas/framework/vfilter/VerificationFilterParameters.java b/src/main/java/at/gv/egiz/pdfas/framework/vfilter/VerificationFilterParameters.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.
- */
-package at.gv.egiz.pdfas.framework.vfilter;
-
-/**
- * The parameters of the VerificationFilter algorithm.
- *
- * @author wprinz
- */
-public interface VerificationFilterParameters
-{
-
- /**
- * Tells the VerificationFilter to extract binary signatures only.
- *
- * <p>
- * Not scanning for textual signatures allows the algorithm to skip text
- * extraction and signature extraction, which are both time and memory
- * intensive processes.
- * </p>
- *
- * @return Returns true if the VerificationFilter should extract binary
- * signatures only.
- */
- public boolean extractBinarySignaturesOnly();
-
- /**
- * Tells the VerificationFilter to assume that there are only singatures (and
- * their Incremental Update blocks) younger than the original document.
- *
- * <p>
- * This is equivalent to saying that the document was not updated using an
- * Incremental update block other than a signature after being singed. The
- * incremental update blocks after the original document contain only
- * signatures (either text or binary).
- * </p>
- * <p>
- * This is equivalent to saying that there exists no Incremental Update block
- * that would render a text signature before it invalid.
- * </p>
- * <p>
- * Under this assumption, the process of finding all text signatures
- * simplifies to one text extraction of the whole document and one signature
- * extraction. This is of course a massive performance gain.
- * </p>
- * <p>
- * Actually the algorithm performs a text extraction of the whole document not
- * including trailing binary signature Incremental Update blocks. This means
- * that if a the last n Incremental Update blocks of a document are binary,
- * there is no use extract text from them.
- * </p>
- * <p>
- * Note that if there are Incremental Update blocks with text after a
- * signature thus this assumption does not hold the signatures older than this
- * block will break.
- * </p>
- *
- * @return Returns true if the Verification filter should assume that there
- * are only signature blocks after the original document.
- */
- public boolean assumeOnlySignatureUpdateBlocks();
-
- /**
- * Tells the VerificationFilter so scan for old signatures in the rest text.
- *
- * <p>
- * The rest text is the text of the oldest text signature or the original
- * document text if there is no text signature.
- * </p>
- *
- * @return Returns true if the VerificationFilter should scan for old text
- * signatures in the rest text.
- */
- public boolean scanForOldSignatures();
-
- /**
- * Return value that tell if the document has been corrected before verification.
- *
- * @return
- */
- public boolean hasBeenCorrected();
-
- public void setBeenCorrected(boolean corrected);
-}