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IDEA-160448 Simplify groupingBy-collectingAndThen-Optional.get Collectors chain

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This commit is contained in:
Tagir Valeev
2017-01-18 11:07:13 +07:00
parent fcb5e74a61
commit 59923c803f
12 changed files with 382 additions and 0 deletions
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java/java-tests/testData/inspection/simplifyCollector/afterMaxBy.java
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// "Use 'Collectors.toConcurrentMap' collector" "true"
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.stream.Collectors;
public class Test {
public static void main(String[] args) {
List<String> input = Arrays.asList("a", "bbb", "cc", "ddd", " x", "ee");
Map<Integer, String> map3 = input.stream().collect(Collectors.toConcurrentMap(String::length, Function.identity(), BinaryOperator.maxBy(String::compareTo)));
System.out.println(map3);
}
}
java/java-tests/testData/inspection/simplifyCollector/afterReducing.java
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// "Use 'Collectors.toMap' collector" "true"
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Collectors;
public class Test {
public static void main(String[] args) {
List<String> input = Arrays.asList("a", "bbb", "cc", "ddd", " x", "ee");
// group by length
// <= reduce to max
/*need to unwrap optional*/
Map<Integer, String> map2 = input.stream().collect(
Collectors.toMap(String::length, Function.identity(), (s1, s2) -> s1.compareTo(s2) > 0 ? /*find max*/ s1 : s2));
System.out.println(map2);
}
}
java/java-tests/testData/inspection/simplifyCollector/afterReducingMapping.java
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// "Use 'Collectors.toMap' collector" "true"
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
public class Test {
public static void main(String[] args) {
List<String> input = Arrays.asList("a", "bbb", "cc", "ddd", " x", "ee");
Map<Integer, String> map = input.stream().collect(Collectors.toMap(String::length, String::trim, (s1, s2) -> s1.compareTo(s2) > 0 ? s1 : s2));
System.out.println(map);
}
}
java/java-tests/testData/inspection/simplifyCollector/beforeMaxBy.java
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// "Use 'Collectors.toConcurrentMap' collector" "true"
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
public class Test {
public static void main(String[] args) {
List<String> input = Arrays.asList("a", "bbb", "cc", "ddd", " x", "ee");
Map<Integer, String> map3 = input.stream().collect(Collectors.groupingB<caret>yConcurrent(String::length, Collectors
.collectingAndThen(Collectors.maxBy(String::compareTo), Optional::get)));
System.out.println(map3);
}
}
java/java-tests/testData/inspection/simplifyCollector/beforeReducing.java
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// "Use 'Collectors.toMap' collector" "true"
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
public class Test {
public static void main(String[] args) {
List<String> input = Arrays.asList("a", "bbb", "cc", "ddd", " x", "ee");
Map<Integer, String> map2 = input.stream().collect(
Collectors.gr<caret>oupingBy(String::length, // group by length
Collectors.collectingAndThen(
Collectors.reducing((s1, s2) -> s1.compareTo(s2) > 0 ? /*find max*/ s1 : s2), // <= reduce to max
/*need to unwrap optional*/ s -> s.get())));
System.out.println(map2);
}
}
java/java-tests/testData/inspection/simplifyCollector/beforeReducingMapping.java
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// "Use 'Collectors.toMap' collector" "true"
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
public class Test {
public static void main(String[] args) {
List<String> input = Arrays.asList("a", "bbb", "cc", "ddd", " x", "ee");
Map<Integer, String> map = input.stream().collect(Collectors
.gr<caret>oupingBy(String::length, Collectors.mapping(String::trim, Collectors
.collectingAndThen(Collectors
.reducing((s1, s2) -> s1.compareTo(s2) > 0 ? s1 : s2), Optional::get))));
System.out.println(map);
}
}