54 lines
1.8 KiB
Java
54 lines
1.8 KiB
Java
// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.signature.consumer;
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import java.util.Comparator;
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import org.bouncycastle.openpgp.PGPSignature;
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import org.pgpainless.signature.SignatureUtils;
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/**
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* Comparator which sorts signatures based on an ordering and on revocation hardness.
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*
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* If a list of signatures gets ordered using this comparator, hard revocations will always
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* come first.
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* Further, signatures are ordered by date according to the {@link SignatureCreationDateComparator.Order}.
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*/
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public class SignatureValidityComparator implements Comparator<PGPSignature> {
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private final SignatureCreationDateComparator creationDateComparator;
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/**
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* Create a new {@link SignatureValidityComparator} which orders signatures the oldest first.
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* Still, hard revocations will come first.
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*/
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public SignatureValidityComparator() {
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this(SignatureCreationDateComparator.DEFAULT_ORDER);
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}
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/**
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* Create a new {@link SignatureValidityComparator} which orders signatures following the passed ordering.
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* Still, hard revocations will come first.
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*
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* @param order order of creation dates
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*/
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public SignatureValidityComparator(SignatureCreationDateComparator.Order order) {
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this.creationDateComparator = new SignatureCreationDateComparator(order);
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}
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@Override
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public int compare(PGPSignature one, PGPSignature two) {
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boolean oneIsHard = SignatureUtils.isHardRevocation(one);
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boolean twoIsHard = SignatureUtils.isHardRevocation(two);
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// both have same "hardness", so compare creation time
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if (oneIsHard == twoIsHard) {
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return creationDateComparator.compare(one, two);
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}
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// favor the "harder" signature
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return oneIsHard ? -1 : 1;
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}
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}
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