Streams friendly API

platform/extensions/src/com/intellij/openapi/extensions/ExtensionPoint.java

@@ -6,6 +6,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
+import java.util.stream.Stream;
 
 public interface ExtensionPoint<T> {
   @NotNull
@@ -26,6 +27,9 @@ public interface ExtensionPoint<T> {
   @NotNull
   List<T> getExtensionList();
 
+  @NotNull
+  Stream<T> extensions();
+
   boolean hasAnyExtensions();
 
   @Nullable

platform/extensions/src/com/intellij/openapi/extensions/ExtensionPointName.java

@@ -7,6 +7,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
+import java.util.stream.Stream;
 
 public final class ExtensionPointName<T> extends BaseExtensionPointName {
   public ExtensionPointName(@NotNull String name) {
@@ -31,6 +32,11 @@ public final class ExtensionPointName<T> extends BaseExtensionPointName {
     return getExtensionList(null);
   }
 
+  @NotNull
+  public Stream<T> extensions() {
+    return extensions(null);
+  }
+
   public boolean hasAnyExtensions() {
     return getPoint(null).hasAnyExtensions();
   }
@@ -45,6 +51,11 @@ public final class ExtensionPointName<T> extends BaseExtensionPointName {
     return getPoint(areaInstance).getExtensions();
   }
 
+  @NotNull
+  public Stream<T> extensions(@Nullable AreaInstance areaInstance) {
+    return getPoint(areaInstance).extensions();
+  }
+
   @NotNull
   public ExtensionPoint<T> getPoint(@Nullable AreaInstance areaInstance) {
     return Extensions.getArea(areaInstance).getExtensionPoint(getName());

platform/extensions/src/com/intellij/openapi/extensions/impl/ExtensionPointImpl.java

@@ -17,6 +17,7 @@ import org.jetbrains.annotations.TestOnly;
 
 import java.lang.reflect.Array;
 import java.util.*;
+import java.util.stream.Stream;
 
 /**
  * @author AKireyev
@@ -203,6 +204,12 @@ public final class ExtensionPointImpl<T> implements ExtensionPoint<T> {
     }
   }
 
+  @NotNull
+  @Override
+  public Stream<T> extensions() {
+    return getExtensionList().stream();
+  }
+
   @Override
   public boolean hasAnyExtensions() {
     final List<T> cache = myExtensionsCache;