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| * http://www.apache.org/licenses/LICENSE-2.0 * |
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| * software distributed under the License is distributed on an * |
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| |
| package org.apache.james.jmap.utils; |
| |
| import java.util.List; |
| import java.util.Set; |
| import java.util.function.BinaryOperator; |
| |
| import org.apache.james.jmap.model.Keyword; |
| import org.apache.james.jmap.model.Keywords; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.Sets; |
| |
| public class KeywordsCombiner implements BinaryOperator<Keywords> { |
| private static final ImmutableList<Keyword> KEYWORD_TO_INTERSECT = ImmutableList.of(Keyword.DRAFT); |
| private static final ImmutableList<Keyword> KEYWORD_NOT_TO_UNION = KEYWORD_TO_INTERSECT; |
| |
| private Keywords.KeywordsFactory keywordsFactory; |
| |
| public KeywordsCombiner() { |
| this.keywordsFactory = Keywords.lenientFactory(); |
| } |
| |
| @Override |
| public Keywords apply(Keywords keywords, Keywords keywords2) { |
| return keywordsFactory |
| .fromSet(Sets.union( |
| union(keywords.getKeywords(), keywords2.getKeywords(), KEYWORD_NOT_TO_UNION), |
| intersect(keywords.getKeywords(), keywords2.getKeywords(), KEYWORD_TO_INTERSECT))); |
| } |
| |
| public Set<Keyword> union(Set<Keyword> set1, Set<Keyword> set2, List<Keyword> exceptKeywords) { |
| return Sets.union(set1, set2) |
| .stream() |
| .filter(keyword -> !exceptKeywords.contains(keyword)) |
| .collect(ImmutableSet.toImmutableSet()); |
| } |
| |
| public Set<Keyword> intersect(Set<Keyword> set1, Set<Keyword> set2, List<Keyword> forKeywords) { |
| return Sets.intersection(set1, set2) |
| .stream() |
| .filter(forKeywords::contains) |
| .collect(ImmutableSet.toImmutableSet()); |
| } |
| } |