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[New] Added SearchResult.toSingleton() for optional result

This commit is contained in:
Robert von Burg 2018-12-05 15:48:21 +01:00
parent d9cdda2157
commit 301c7bf785
1 changed files with 17 additions and 6 deletions
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23
li.strolch.agent/src/main/java/li/strolch/search/SearchResult.java
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@ -1,9 +1,8 @@
package li.strolch.search;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static li.strolch.utils.collections.CollectionsHelper.singletonCollector;
import java.util.*;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
@ -11,7 +10,6 @@ import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import li.strolch.utils.collections.CollectionsHelper;
import li.strolch.utils.collections.Paging;
/**
@ -135,6 +133,19 @@ public class SearchResult<T> {
return Paging.asPage(this.stream.collect(Collectors.toList()), offset, limit);
}
/**
* Returns the single element in the stream, or throws an {@link IllegalStateException} if the stream does not
* contain 1 and only 1 element
*
* @return the single element in the stream
*
* @throws IllegalStateException
* if not 1 and only 1 element is in the stream
*/
public Optional<T> toSingleton() {
return Optional.of(this.stream.collect(singletonCollector(true)));
}
/**
* Returns the single element in the stream, or throws an {@link IllegalStateException} if the stream does not
* contain 1 and only 1 element
@ -145,7 +156,7 @@ public class SearchResult<T> {
* if not 1 and only 1 element is in the stream
*/
public T toSingleton(Supplier<String> errorMsgSupplier) throws IllegalStateException {
return this.stream.collect(CollectionsHelper.singletonCollector(errorMsgSupplier));
return this.stream.collect(singletonCollector(errorMsgSupplier));
}
/**