IDEA-169924 add utility methods to BreadcrumbsInfoProvider

plugins/yaml/testSrc/org/jetbrains/yaml/breadcrumbs/YAMLBreadcrumbsTest.java

@@ -100,8 +100,7 @@ public class YAMLBreadcrumbsTest extends LightPlatformCodeInsightFixtureTestCase
     }
     final Language language = element.getContainingFile().getLanguage();
 
-    final BreadcrumbsInfoProvider provider = ContainerUtil.find(Extensions.getExtensions(BreadcrumbsInfoProvider.EP_NAME),
-                                                                (p) -> Arrays.asList(p.getLanguages()).contains(language));
+    final BreadcrumbsInfoProvider provider = BreadcrumbsInfoProvider.find(language::equals);
     if (provider == null) {
       return Collections.emptyList();
     }

xml/impl/src/com/intellij/xml/breadcrumbs/BreadcrumbsXmlWrapper.java

@@ -449,15 +449,7 @@ public class BreadcrumbsXmlWrapper extends JComponent implements Disposable {
 
   @Nullable
   private static BreadcrumbsInfoProvider getInfoProvider(@NotNull final Language language) {
-    for (final BreadcrumbsInfoProvider provider : Extensions.getExtensions(BreadcrumbsInfoProvider.EP_NAME)) {
-      for (final Language language1 : provider.getLanguages()) {
-        if (language.isKindOf(language1)) {
-          return provider;
-        }
-      }
-    }
-
-    return null;
+    return BreadcrumbsInfoProvider.find(supported -> supported.isKindOf(language));
   }
 
   private static class MyUpdate extends Update {

xml/openapi/src/com/intellij/xml/breadcrumbs/BreadcrumbsInfoProvider.java

@@ -28,8 +28,12 @@ import com.intellij.openapi.extensions.ExtensionPointName;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.LinkedHashMap;
+import java.util.function.Predicate;
+
 public abstract class BreadcrumbsInfoProvider {
-  public static final ExtensionPointName<BreadcrumbsInfoProvider> EP_NAME = ExtensionPointName.create("com.intellij.breadcrumbsInfoProvider");
+  public static final ExtensionPointName<BreadcrumbsInfoProvider> EP_NAME
+    = ExtensionPointName.create("com.intellij.breadcrumbsInfoProvider");
 
   public abstract Language[] getLanguages();
 
@@ -45,4 +49,24 @@ public abstract class BreadcrumbsInfoProvider {
 
   @Nullable
   public abstract String getElementTooltip(@NotNull final PsiElement e);
+
+  @NotNull
+  public static Iterable<Language> getSupportedLanguages() {
+    LinkedHashMap<String, Language> map = new LinkedHashMap<>();
+    for (BreadcrumbsInfoProvider provider : EP_NAME.getExtensions()) {
+      for (Language language : provider.getLanguages()) {
+        map.put(language.getID(), language);
+      }
+    }
+    return map.values();
+  }
+
+  public static BreadcrumbsInfoProvider find(Predicate<Language> predicate) {
+    for (BreadcrumbsInfoProvider provider : EP_NAME.getExtensions()) {
+      for (Language language : provider.getLanguages()) {
+        if (predicate.test(language)) return provider;
+      }
+    }
+    return null;
+  }
 }