[groovy] make name value pair detachable (IDEA-CR-14566)

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/api/auxiliary/modifiers/annotation/GrAnnotationNameValuePair.java

@@ -25,7 +25,8 @@ import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElement;
  * @author: Dmitry.Krasilschikov
  * @date: 04.04.2007
  */
-public interface GrAnnotationNameValuePair extends GroovyPsiElement, PsiNameValuePair {
+public interface GrAnnotationNameValuePair extends GroovyPsiElement, PsiNameValuePair, PsiNameValuePair.Detachable {
+
   GrAnnotationNameValuePair[] EMPTY_ARRAY = new GrAnnotationNameValuePair[0];
 
   @Nullable

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/auxiliary/annotation/GrAnnotationNameValuePairImpl.java

@@ -20,6 +20,7 @@ import com.intellij.lang.ASTNode;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.psi.*;
 import com.intellij.psi.tree.IElementType;
+import com.intellij.reference.SoftReference;
 import com.intellij.util.ArrayUtilRt;
 import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.containers.ContainerUtilRt;
@@ -42,6 +43,7 @@ import org.jetbrains.plugins.groovy.lang.psi.impl.auxiliary.modifiers.GrAnnotati
 import org.jetbrains.plugins.groovy.lang.psi.stubs.GrNameValuePairStub;
 import org.jetbrains.plugins.groovy.lang.psi.util.GroovyCommonClassNames;
 
+import java.lang.ref.Reference;
 import java.util.List;
 
 public class GrAnnotationNameValuePairImpl extends GrStubElementBase<GrNameValuePairStub>
@@ -97,6 +99,34 @@ public class GrAnnotationNameValuePairImpl extends GrStubElementBase<GrNameValue
     return null;
   }
 
+  private volatile Reference<PsiAnnotationMemberValue> myDetachedValue;
+
+  @Override
+  @Nullable
+  public PsiAnnotationMemberValue getDetachedValue() {
+    GrNameValuePairStub stub = getGreenStub();
+    if (stub != null) {
+      String text = stub.getValue();
+      PsiAnnotationMemberValue result = SoftReference.dereference(myDetachedValue);
+      if (result == null) {
+        GrAnnotation annotation = GroovyPsiElementFactory.getInstance(getProject()).createAnnotationFromText(
+          "@F(" + text + ")", this
+        );
+        PsiAnnotationMemberValue value = annotation.findAttributeValue(null);
+        myDetachedValue = new SoftReference<>(result = value);
+      }
+      return result;
+    }
+
+    return getValue();
+  }
+
+  @Override
+  public void subtreeChanged() {
+    super.subtreeChanged();
+    myDetachedValue = null;
+  }
+
   @Override
   public GrAnnotationMemberValue getValue() {
     return findChildByClass(GrAnnotationMemberValue.class);

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/transformations/impl/autoClone/AutoCloneTransformationSupport.kt

@@ -15,10 +15,8 @@
  */
 package org.jetbrains.plugins.groovy.transformations.impl.autoClone
 
-import com.intellij.psi.CommonClassNames
-import com.intellij.psi.PsiEnumConstant
-import com.intellij.psi.PsiModifier
-import com.intellij.psi.PsiType
+import com.intellij.codeInsight.AnnotationUtil
+import com.intellij.psi.*
 import com.intellij.psi.impl.light.LightMethodBuilder
 import org.jetbrains.plugins.groovy.GroovyLanguage
 import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrReferenceExpression
@@ -49,12 +47,12 @@ class AutoCloneTransformationSupport : AstTransformationSupport {
       originInfo = ORIGIN_INFO
     }
 
-    val value = annotation.findDeclaredAttributeValue("style") as? GrReferenceExpression ?: return
+    val value = annotation.findDeclaredDetachedValue("style") as? GrReferenceExpression ?: return
     val constant = value.resolve() as? PsiEnumConstant ?: return
     if (constant.containingClass?.qualifiedName != "groovy.transform.AutoCloneStyle") return
     when (constant.name) {
       "COPY_CONSTRUCTOR" -> {
-        if (context.codeClass.codeConstructors.size == 0) {
+        if (context.codeClass.codeConstructors.isEmpty()) {
           context += LightMethodBuilder(context.codeClass, GroovyLanguage).apply {
             isConstructor = true
             addModifier(PsiModifier.PUBLIC)
@@ -84,4 +82,13 @@ class AutoCloneTransformationSupport : AstTransformationSupport {
       }
     }
   }
+
+  private fun PsiAnnotation.findDeclaredDetachedValue(attributeName: String?): PsiAnnotationMemberValue? {
+    val styleAttribute = AnnotationUtil.findDeclaredAttribute(this, attributeName)
+    return when (styleAttribute) {
+      null -> null
+      is PsiNameValuePair.Detachable -> styleAttribute.detachedValue
+      else -> styleAttribute.value
+    }
+  }
 }