FuseStreamOperationsInspection

Fixes IDEA-179303 Suggest replacing Collectors.toList()/toSet() + collection constructor with Collectors.toCollection

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/afterJustArrayList.java

@@ -0,0 +1,18 @@
+// "Fix all 'Subsequent steps can be fused into Stream API chain' problems in file" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  interface Foo {
+  }
+
+  // IDEA-179303
+  void test1(Stream<Foo> fooStream) {
+    ArrayList<Foo> collectedFoos = fooStream.collect(Collectors.toCollection(ArrayList::new));
+  }
+
+  void test2(Stream<Foo> fooStream) {
+    List<Foo> collectedFoos = fooStream.collect(Collectors.toList());
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/afterListSetList.java

@@ -0,0 +1,10 @@
+// "Fuse HashSet and ArrayList into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  Collection<String> test(String[] args) {
+      return Arrays.stream(args).filter(String::isEmpty).distinct().collect(Collectors.toList());
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/afterSetListSort.java

@@ -0,0 +1,10 @@
+// "Fuse ArrayList, 'sort' and 'toArray' into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  public void testSetListSort(String[] args) {
+      System.out.println(Arrays.stream(args).distinct().sorted().toArray());
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/afterSort.java

@@ -0,0 +1,11 @@
+// "Fuse 'sort' into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  public List<String> testToArray(String[] args) {
+    List<String> list = Arrays.stream(args).sorted().collect(Collectors.toList());
+      return list;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/afterToArray.java

@@ -0,0 +1,10 @@
+// "Fuse 'toArray' into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  public String[] testToArray(String[] args) {
+      return Arrays.stream(args).toArray(String[]::new);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/afterToArrayTreeSet.java

@@ -0,0 +1,10 @@
+// "Fuse 'toArray' into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  public String[] testToArray(String[] args) {
+      return Arrays.stream(args).distinct().sorted().toArray(String[]::new);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/beforeJustArrayList.java

@@ -0,0 +1,18 @@
+// "Fix all 'Subsequent steps can be fused into Stream API chain' problems in file" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  interface Foo {
+  }
+
+  // IDEA-179303
+  void test1(Stream<Foo> fooStream) {
+    ArrayList<Foo> collectedFoos = new ArrayList<>(fooStream.co<caret>llect(Collectors.toList()));
+  }
+
+  void test2(Stream<Foo> fooStream) {
+    List<Foo> collectedFoos = new ArrayList<>(fooStream.collect(Collectors.toList()));
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/beforeListSetList.java

@@ -0,0 +1,12 @@
+// "Fuse HashSet and ArrayList into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  Collection<String> test(String[] args) {
+    List<String> list = Arrays.stream(args).filter(String::isEmpty).coll<caret>ect(Collectors.toList());
+    HashSet<String> strings = new HashSet<>(list);
+    return new ArrayList<>(strings);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/beforeSetListSort.java

@@ -0,0 +1,13 @@
+// "Fuse ArrayList, 'sort' and 'toArray' into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  public void testSetListSort(String[] args) {
+    Set<String> set = Arrays.stream(args).co<caret>llect(Collectors.toSet());
+    List<String> list = new ArrayList<>(set);
+    list.sort(null);
+    System.out.println(list.toArray());
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/beforeSort.java

@@ -0,0 +1,12 @@
+// "Fuse 'sort' into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  public List<String> testToArray(String[] args) {
+    List<String> list = Arrays.stream(args).c<caret>ollect(Collectors.toList());
+    list.sort(null);
+    return list;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/beforeToArray.java

@@ -0,0 +1,11 @@
+// "Fuse 'toArray' into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  public String[] testToArray(String[] args) {
+    List<String> list = Arrays.stream(args).co<caret>llect(Collectors.toList());
+    return list.toArray(new String[list.size()]);
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/fuseStreamOperations/beforeToArrayTreeSet.java

@@ -0,0 +1,11 @@
+// "Fuse 'toArray' into the Stream API chain" "true"
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class Test {
+  public String[] testToArray(String[] args) {
+    Set<String> set = Arrays.stream(args).co<caret>llect(Collectors.toCollection(TreeSet::new));
+    return set.toArray(new String[set.size()]);
+  }
+}