annotate PsiReference's #getElement and #getRangeInElement with @NotNull

RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpBackrefImpl.java

@@ -73,10 +73,12 @@ public class RegExpBackrefImpl extends RegExpElementImpl implements RegExpBackre
 
     public PsiReference getReference() {
         return new PsiReference() {
+            @NotNull
             public PsiElement getElement() {
                 return RegExpBackrefImpl.this;
             }
 
+            @NotNull
             public TextRange getRangeInElement() {
                 return TextRange.from(0, getElement().getTextLength());
             }

RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpNamedGroupRefImpl.java

@@ -93,11 +93,13 @@ public class RegExpNamedGroupRefImpl extends RegExpElementImpl implements RegExp
       return null;
     }
     return new PsiReference() {
+      @NotNull
       @Override
       public PsiElement getElement() {
         return RegExpNamedGroupRefImpl.this;
       }
 
+      @NotNull
       @Override
       public TextRange getRangeInElement() {
         final ASTNode groupNode = getNode().getFirstChildNode();

RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpPropertyImpl.java

@@ -66,10 +66,12 @@ public class RegExpPropertyImpl extends RegExpElementImpl implements RegExpPrope
     }
 
   private class MyPsiReference implements PsiReference {
+        @NotNull
         public PsiElement getElement() {
             return RegExpPropertyImpl.this;
         }
 
+        @NotNull
         public TextRange getRangeInElement() {
             ASTNode firstNode = getNode().findChildByType(RegExpTT.CARET);
             if (firstNode == null) {

java/java-impl/src/com/intellij/psi/AbstractQualifiedReference.java

@@ -44,6 +44,7 @@ public abstract class AbstractQualifiedReference<T extends AbstractQualifiedRefe
     return this;
   }
 
+  @NotNull
   @Override
   public final PsiElement getElement() {
     return this;
@@ -210,6 +211,7 @@ public abstract class AbstractQualifiedReference<T extends AbstractQualifiedRefe
   @Nullable
   protected abstract PsiElement getReferenceNameElement();
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement element = getSeparator();

java/java-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/JavaClassReference.java

@@ -160,6 +160,7 @@ public class JavaClassReference extends GenericReference implements PsiJavaRefer
     return myJavaClassReferenceSet.canReferencePackage(myIndex);
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myJavaClassReferenceSet.getElement();
@@ -170,6 +171,7 @@ public class JavaClassReference extends GenericReference implements PsiJavaRefer
     return (element instanceof PsiMember || element instanceof PsiPackage) && super.isReferenceTo(element);
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return myRange;

java/java-impl/src/com/intellij/spi/psi/SPIClassProviderReferenceElement.java

@@ -33,6 +33,7 @@ public class SPIClassProviderReferenceElement extends SPIPackageOrClassReference
     super(node);
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return TextRange.from(0, getTextLength());

java/java-impl/src/com/intellij/spi/psi/SPIPackageOrClassReferenceElement.java

@@ -32,11 +32,13 @@ public class SPIPackageOrClassReferenceElement extends ASTWrapperPsiElement impl
     super(node);
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement last = PsiTreeUtil.getDeepestLast(this);

java/java-indexing-impl/src/com/intellij/psi/impl/search/ConstructorReferencesSearchHelper.java

@@ -251,11 +251,13 @@ class ConstructorReferencesSearchHelper {
       return true;
     }
     return processor.process(new LightMemberReference(myManager, usage, PsiSubstitutor.EMPTY) {
+      @NotNull
       @Override
       public PsiElement getElement() {
         return usage;
       }
 
+      @NotNull
       @Override
       public TextRange getRangeInElement() {
         if (usage instanceof PsiNameIdentifierOwner) {

java/java-psi-impl/src/com/intellij/psi/impl/compiled/ClsJavaCodeReferenceElementImpl.java

@@ -330,11 +330,13 @@ public class ClsJavaCodeReferenceElementImpl extends ClsElementImpl implements P
     }
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(0, getTextLength());
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;

java/java-psi-impl/src/com/intellij/psi/impl/compiled/ClsReferenceExpressionImpl.java

@@ -121,11 +121,13 @@ public class ClsReferenceExpressionImpl extends ClsElementImpl implements PsiRef
     return result != JavaResolveResult.EMPTY ? new JavaResolveResult[]{result} : JavaResolveResult.EMPTY_ARRAY;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(0, getTextLength());

java/java-psi-impl/src/com/intellij/psi/impl/light/LightClassReferenceBase.java

@@ -140,11 +140,13 @@ abstract class LightClassReferenceBase extends LightElement implements PsiJavaCo
     return false;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(0, getTextLength());
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;

java/java-psi-impl/src/com/intellij/psi/impl/light/LightMemberReference.java

@@ -173,11 +173,13 @@ public class LightMemberReference extends LightElement implements PsiJavaCodeRef
     return false;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(0, getTextLength());
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;

java/java-psi-impl/src/com/intellij/psi/impl/light/LightPackageReference.java

@@ -168,11 +168,13 @@ public class LightPackageReference extends LightElement implements PsiJavaCodeRe
     }
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(0, getTextLength());
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;

java/java-psi-impl/src/com/intellij/psi/impl/source/PsiEnumConstantImpl.java

@@ -220,11 +220,13 @@ public class PsiEnumConstantImpl extends JavaStubPsiElement<PsiFieldStub> implem
   }
 
   private class MyReference implements PsiJavaReference {
+    @NotNull
     @Override
     public PsiElement getElement() {
       return PsiEnumConstantImpl.this;
     }
 
+    @NotNull
     @Override
     public TextRange getRangeInElement() {
       PsiIdentifier nameIdentifier = getNameIdentifier();

java/java-psi-impl/src/com/intellij/psi/impl/source/PsiImportStaticReferenceElementImpl.java

@@ -170,11 +170,13 @@ public class PsiImportStaticReferenceElementImpl extends CompositePsiElement imp
     return childByRole.getText();
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     TreeElement nameChild = (TreeElement)findChildByRole(ChildRole.REFERENCE_NAME);

java/java-psi-impl/src/com/intellij/psi/impl/source/PsiJavaCodeReferenceElementImpl.java

@@ -1018,6 +1018,7 @@ public class PsiJavaCodeReferenceElementImpl extends CompositePsiElement impleme
     return childByRole.getText();
   }
 
+  @NotNull
   @Override
   public final TextRange getRangeInElement() {
     return calcRangeInElement(this);
@@ -1031,6 +1032,7 @@ public class PsiJavaCodeReferenceElementImpl extends CompositePsiElement impleme
     return parameterList.getTypeArguments();
   }
 
+  @NotNull
   @Override
   public final PsiElement getElement() {
     return this;

java/java-psi-impl/src/com/intellij/psi/impl/source/PsiLabelReference.java

@@ -35,11 +35,13 @@ public class PsiLabelReference implements PsiReference{
     myIdentifier = identifier;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement(){
     return myStatement;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement(){
     final int parent = myIdentifier.getStartOffsetInParent();

java/java-psi-impl/src/com/intellij/psi/impl/source/javadoc/PsiDocMethodOrFieldRef.java

@@ -370,6 +370,7 @@ public class PsiDocMethodOrFieldRef extends CompositePsiElement implements PsiDo
       return getManager().areElementsEquivalent(resolve(), element);
     }
 
+    @NotNull
     @Override
     public TextRange getRangeInElement() {
       final ASTNode sharp = findChildByType(DOC_TAG_VALUE_SHARP_TOKEN);
@@ -383,6 +384,7 @@ public class PsiDocMethodOrFieldRef extends CompositePsiElement implements PsiDo
       return new TextRange(getTextLength(), getTextLength());
     }
 
+    @NotNull
     @Override
     public PsiElement getElement() {
       return PsiDocMethodOrFieldRef.this;

java/java-psi-impl/src/com/intellij/psi/impl/source/javadoc/PsiDocParamRef.java

@@ -145,12 +145,14 @@ public class PsiDocParamRef extends CompositePsiElement implements PsiDocTagValu
         return false;
       }
 
+      @NotNull
       @Override
       public TextRange getRangeInElement() {
         final int startOffsetInParent = valueToken.getPsi().getStartOffsetInParent();
         return new TextRange(startOffsetInParent, startOffsetInParent + valueToken.getTextLength());
       }
 
+      @NotNull
       @Override
       public PsiElement getElement() {
         return PsiDocParamRef.this;

java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/PsiMethodReferenceExpressionImpl.java

@@ -269,6 +269,7 @@ public class PsiMethodReferenceExpressionImpl extends JavaStubPsiElement<Functio
     return element instanceof PsiExpression || element instanceof PsiTypeElement ? element : null;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement element = getReferenceNameElement();
@@ -444,6 +445,7 @@ public class PsiMethodReferenceExpressionImpl extends JavaStubPsiElement<Functio
     throw new IncorrectOperationException();
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;

java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/PsiNameValuePairImpl.java

@@ -136,6 +136,7 @@ public class PsiNameValuePairImpl extends JavaStubPsiElement<PsiNameValuePairStu
         return target instanceof PsiClass ? (PsiClass)target : null;
       }
 
+      @NotNull
       @Override
       public PsiElement getElement() {
         PsiIdentifier nameIdentifier = getNameIdentifier();
@@ -145,6 +146,7 @@ public class PsiNameValuePairImpl extends JavaStubPsiElement<PsiNameValuePairStu
         return PsiNameValuePairImpl.this;
       }
 
+      @NotNull
       @Override
       public TextRange getRangeInElement() {
         PsiIdentifier id = getNameIdentifier();

java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/PsiNewExpressionImpl.java

@@ -165,11 +165,13 @@ public class PsiNewExpressionImpl extends ExpressionPsiElement implements PsiNew
         return JavaResolveResult.EMPTY_ARRAY;
       }
 
+      @NotNull
       @Override
       public PsiElement getElement() {
         return PsiNewExpressionImpl.this;
       }
 
+      @NotNull
       @Override
       public TextRange getRangeInElement() {
         return null;

java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/PsiReferenceExpressionImpl.java

@@ -808,11 +808,13 @@ public class PsiReferenceExpressionImpl extends ExpressionPsiElement implements
     }
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return PsiJavaCodeReferenceElementImpl.calcRangeInElement(this);

json/src/com/intellij/json/psi/impl/JsonPropertyNameReference.java

@@ -21,11 +21,13 @@ public class JsonPropertyNameReference implements PsiReference {
     myProperty = property;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myProperty;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final JsonValue nameElement = myProperty.getNameElement();

platform/analysis-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/FileReference.java

@@ -338,6 +338,7 @@ public class FileReference implements PsiFileReference, FileReferenceOwner, PsiP
     return myIndex > 0 ? myFileReferenceSet.getReference(myIndex - 1) : null;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myFileReferenceSet.getElement();
@@ -363,6 +364,7 @@ public class FileReference implements PsiFileReference, FileReferenceOwner, PsiP
     return item != null && FileReferenceHelperRegistrar.areElementsEquivalent(item, (PsiFileSystemItem)element);
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return myRange;

platform/core-api/src/com/intellij/psi/PsiPolyVariantReferenceBase.java

@@ -17,6 +17,7 @@
 package com.intellij.psi;
 
 import com.intellij.openapi.util.TextRange;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 /**
@@ -24,19 +25,19 @@ import org.jetbrains.annotations.Nullable;
  */
 public abstract class PsiPolyVariantReferenceBase<T extends PsiElement> extends PsiReferenceBase<T> implements PsiPolyVariantReference {
 
-  public PsiPolyVariantReferenceBase(final T psiElement) {
+  public PsiPolyVariantReferenceBase(@NotNull final T psiElement) {
     super(psiElement);
   }
 
-  public PsiPolyVariantReferenceBase(T element, TextRange range) {
+  public PsiPolyVariantReferenceBase(@NotNull T element, TextRange range) {
     super(element, range);
   }
 
-  public PsiPolyVariantReferenceBase(final T psiElement, final boolean soft) {
+  public PsiPolyVariantReferenceBase(@NotNull final T psiElement, final boolean soft) {
     super(psiElement, soft);
   }
 
-  public PsiPolyVariantReferenceBase(final T element, final TextRange range, final boolean soft) {
+  public PsiPolyVariantReferenceBase(@NotNull final T element, final TextRange range, final boolean soft) {
     super(element, range, soft);
   }
 

platform/core-api/src/com/intellij/psi/PsiReference.java

@@ -44,6 +44,7 @@ public interface PsiReference {
    *
    * @return the underlying element of the reference.
    */
+  @NotNull
   PsiElement getElement();
 
   /**
@@ -52,6 +53,7 @@ public interface PsiReference {
    *
    * @return Relative range in element
    */
+  @NotNull
   TextRange getRangeInElement();
 
   /**

platform/core-api/src/com/intellij/psi/PsiReferenceBase.java

@@ -36,7 +36,7 @@ public abstract class PsiReferenceBase<T extends PsiElement> implements PsiRefer
    * @param rangeInElement range relatively to the element's start offset
    * @param soft soft
    */
-  public PsiReferenceBase(T element, TextRange rangeInElement, boolean soft) {
+  public PsiReferenceBase(@NotNull T element, TextRange rangeInElement, boolean soft) {
     myElement = element;
     myRangeInElement = rangeInElement;
     mySoft = soft;
@@ -46,7 +46,7 @@ public abstract class PsiReferenceBase<T extends PsiElement> implements PsiRefer
    * @param element PSI element
    * @param rangeInElement range relatively to the element's start offset
    */
-  public PsiReferenceBase(T element, TextRange rangeInElement) {
+  public PsiReferenceBase(@NotNull T element, TextRange rangeInElement) {
     this(element);
     myRangeInElement = rangeInElement;
   }
@@ -56,7 +56,7 @@ public abstract class PsiReferenceBase<T extends PsiElement> implements PsiRefer
    * @param element PSI element
    * @param soft soft
    */
-  public PsiReferenceBase(T element, boolean soft) {
+  public PsiReferenceBase(@NotNull T element, boolean soft) {
     myElement = element;
     mySoft = soft;
   }
@@ -87,11 +87,13 @@ public abstract class PsiReferenceBase<T extends PsiElement> implements PsiRefer
     }
   }
 
+  @NotNull
   @Override
   public T getElement() {
     return myElement;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     if (myRangeInElement == null) {

platform/core-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/PsiDelegateReference.java

@@ -18,11 +18,13 @@ public class PsiDelegateReference implements PsiReference {
     myDelegate = delegate;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myDelegate.getElement();
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return myDelegate.getRangeInElement();

platform/core-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/PsiMultiReference.java

@@ -75,11 +75,13 @@ public class PsiMultiReference implements PsiPolyVariantReference {
     return myReferences[0];
   }
 
+  @NotNull
   @Override
   public PsiElement getElement(){
     return myElement;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     TextRange range = getRangeInElementIfSameForAll();

platform/lang-api/src/com/intellij/psi/PsiReferenceWrapper.java

@@ -14,11 +14,13 @@ public class PsiReferenceWrapper implements PsiReference {
     myOriginalPsiReference = originalPsiReference;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myOriginalPsiReference.getElement();
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return myOriginalPsiReference.getRangeInElement();

platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/analysis/encoding/EncodingReference.java

@@ -46,11 +46,13 @@ public class EncodingReference implements PsiReference, EmptyResolveMessageProvi
     myRangeInElement = rangeInElement;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myElement;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return myRangeInElement;

platform/lang-impl/src/com/intellij/openapi/paths/PsiDynaReference.java

@@ -64,6 +64,7 @@ public class PsiDynaReference<T extends PsiElement> extends PsiReferenceBase<T>
     if (!reference.isSoft()) mySoft = false;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
 

plugins/IntelliLang/java-support/org/intellij/plugins/intelliLang/util/StringLiteralReference.java

@@ -34,10 +34,12 @@ public abstract class StringLiteralReference implements PsiReference {
     myValue = value;
   }
 
+  @NotNull
   public PsiElement getElement() {
     return myValue;
   }
 
+  @NotNull
   public TextRange getRangeInElement() {
     return ElementManipulators.getValueTextRange(myValue);
   }

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/findUsages/GroovyConstructorUsagesSearcher.java

@@ -250,11 +250,13 @@ public class GroovyConstructorUsagesSearcher extends QueryExecutorBase<PsiRefere
     PsiManager manager = constructor.getManager();
     if (manager.areElementsEquivalent(usage, constructor) || manager.areElementsEquivalent(constructor.getContainingClass(), usage.getContainingClass())) return;
     processor.process(new LightMemberReference(manager, usage, PsiSubstitutor.EMPTY) {
+      @NotNull
       @Override
       public PsiElement getElement() {
         return usage;
       }
 
+      @NotNull
       @Override
       public TextRange getRangeInElement() {
         if (usage instanceof PsiClass) {

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/groovydoc/psi/impl/GrDocMemberReferenceImpl.java

@@ -110,6 +110,7 @@ public abstract class GrDocMemberReferenceImpl extends GroovyDocPsiElementImpl i
     return token;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
@@ -120,6 +121,7 @@ public abstract class GrDocMemberReferenceImpl extends GroovyDocPsiElementImpl i
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement refNameElement = getReferenceNameElement();

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/groovydoc/psi/impl/GrDocParameterReferenceImpl.java

@@ -90,11 +90,13 @@ public class GrDocParameterReferenceImpl extends GroovyDocPsiElementImpl impleme
     return ResolveResult.EMPTY_ARRAY;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(0, getTextLength());

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/GrReferenceElementImpl.java

@@ -59,11 +59,13 @@ public abstract class GrReferenceElementImpl<Q extends PsiElement> extends Groov
     return qualifiedReferenceName;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement refNameElement = getReferenceNameElement();

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

@@ -49,6 +49,7 @@ public class GrLabelReference implements PsiReference {
     throw new IncorrectOperationException("Can't bind not to labeled statement");
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement identifier = myStatement.getLabelIdentifier();
@@ -104,6 +105,7 @@ public class GrLabelReference implements PsiReference {
     return false;
   }
 
+  @NotNull
   @Override
   public GrFlowInterruptingStatement getElement() {
     return myStatement;

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

@@ -151,11 +151,13 @@ public class GrAnnotationNameValuePairImpl extends GrStubElementBase<GrNameValue
     return getNameIdentifierGroovy() == null ? null : this;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     PsiElement nameId = getNameIdentifierGroovy();

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/GrOperatorExpressionImpl.java

@@ -45,11 +45,13 @@ abstract public class GrOperatorExpressionImpl extends GrExpressionImpl implemen
     return getOperationToken().getNode().getElementType();
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement token = getOperationToken();

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/arguments/GrArgumentLabelImpl.java

@@ -164,11 +164,13 @@ public class GrArgumentLabelImpl extends GroovyPsiElementImpl implements GrArgum
     return null;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(0, getTextLength());

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/expressions/GrNewExpressionImpl.java

@@ -221,11 +221,13 @@ public class GrNewExpressionImpl extends GrCallExpressionImpl implements GrNewEx
       return GrNewExpressionImpl.this.multiResolve(incompleteCode);
     }
 
+    @NotNull
     @Override
     public GrNewExpressionImpl getElement() {
       return GrNewExpressionImpl.this;
     }
 
+    @NotNull
     @Override
     public TextRange getRangeInElement() {
       return TextRange.EMPTY_RANGE;

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/expressions/arithmetic/GrUnaryExpressionImpl.java

@@ -143,11 +143,13 @@ public class GrUnaryExpressionImpl extends GrExpressionImpl implements GrUnaryEx
     return getFirstChild() instanceof GrExpression;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement opToken = getOperationToken();

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/expressions/types/GrSafeCastExpressionImpl.java

@@ -83,11 +83,13 @@ public class GrSafeCastExpressionImpl extends GrExpressionImpl implements GrSafe
     return this;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final PsiElement as = findNotNullChildByType(GroovyTokenTypes.kAS);

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/statements/typedef/enumConstant/GrEnumConstantImpl.java

@@ -206,11 +206,13 @@ public class GrEnumConstantImpl extends GrFieldImpl implements GrEnumConstant {
       return GrEnumConstantImpl.this.multiResolve(false);
     }
 
+    @NotNull
     @Override
     public PsiElement getElement() {
       return GrEnumConstantImpl.this;
     }
 
+    @NotNull
     @Override
     public TextRange getRangeInElement() {
       return getNameIdentifierGroovy().getTextRange().shiftRight(-getTextOffset());

plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/synthetic/GrLightClassReferenceElement.java

@@ -111,11 +111,13 @@ public class GrLightClassReferenceElement extends LightElement implements GrCode
     return "light reference element";
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(0, getTextLength());

plugins/javaFX/src/org/jetbrains/plugins/javaFX/fxml/refs/FxmlReferencesContributor.java

@@ -161,11 +161,13 @@ public class FxmlReferencesContributor extends PsiReferenceContributor {
         myPosition = position;
       }
 
+      @NotNull
       @Override
       public PsiElement getElement() {
         return myReference.getElement();
       }
 
+      @NotNull
       @Override
       public TextRange getRangeInElement() {
         return myReference.getRangeInElement();

plugins/javaFX/src/org/jetbrains/plugins/javaFX/fxml/refs/JavaFxEventHandlerReference.java

@@ -79,6 +79,7 @@ public class JavaFxEventHandlerReference extends PsiReferenceBase<XmlAttributeVa
     return false;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final TextRange range = super.getRangeInElement();

plugins/javaFX/src/org/jetbrains/plugins/javaFX/fxml/refs/JavaFxTagNameReference.java

@@ -21,6 +21,7 @@ public class JavaFxTagNameReference extends TagNameReference{
     super(element, startTagFlag);
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final TextRange rangeInElement = super.getRangeInElement();

plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/references/MavenPsiReference.java

@@ -48,6 +48,7 @@ public abstract class MavenPsiReference implements PsiReference {
     myRange = range;
   }
 
+  @NotNull
   public PsiElement getElement() {
     return myElement;
   }
@@ -57,6 +58,7 @@ public abstract class MavenPsiReference implements PsiReference {
     return myText;
   }
 
+  @NotNull
   public TextRange getRangeInElement() {
     return myRange;
   }

plugins/properties/properties-psi-impl/src/com/intellij/lang/properties/references/PropertyReferenceBase.java

@@ -87,6 +87,7 @@ public abstract class PropertyReferenceBase implements PsiPolyVariantReference,
     return myElement;
   }
 
+  @NotNull
   public TextRange getRangeInElement() {
     return myTextRange;
   }

plugins/ui-designer/src/com/intellij/uiDesigner/binding/ReferenceInForm.java

@@ -40,6 +40,7 @@ public abstract class ReferenceInForm implements PsiReference {
     myRangeMarker = document.createRangeMarker(range);
   }
 
+  @NotNull
   public PsiElement getElement() {
     return myFile;
   }
@@ -53,6 +54,7 @@ public abstract class ReferenceInForm implements PsiReference {
     return myFile;
   }
 
+  @NotNull
   public TextRange getRangeInElement() {
     return TextRange.create(myRangeMarker);
   }

plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/psi/impl/ReferenceBase.java

@@ -34,10 +34,12 @@ public abstract class ReferenceBase implements PsiReference {
         this.nameNode = nameNode;
     }
 
+    @NotNull
     public XPathElement getElement() {
         return element;
     }
 
+    @NotNull
     public TextRange getRangeInElement() {
         final int outer = element.getTextRange().getStartOffset();
         return TextRange.from(nameNode.getTextRange().getStartOffset() - outer, nameNode.getTextLength());

plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/psi/impl/XPathVariableReferenceImpl.java

@@ -56,6 +56,7 @@ public class XPathVariableReferenceImpl extends XPathElementImpl implements XPat
         return this;
     }
 
+    @NotNull
     public PsiElement getElement() {
         return this;
     }
@@ -64,6 +65,7 @@ public class XPathVariableReferenceImpl extends XPathElementImpl implements XPat
         return getTextRange().getStartOffset() + 1;
     }
 
+    @NotNull
     public TextRange getRangeInElement() {
         return TextRange.from(1, getTextLength() - 1);
     }

plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/references/ExternalResourceReference.java

@@ -50,11 +50,12 @@ class ExternalResourceReference implements PsiReference, LocalQuickFixProvider {
   }
 
 
-  @Nullable
+  @NotNull
   public PsiElement getElement() {
     return myAttribute.getValueElement();
   }
 
+  @NotNull
   public TextRange getRangeInElement() {
     final XmlAttributeValue value = myAttribute.getValueElement();
     return value != null ? TextRange.from(1, value.getTextLength() - 2) : TextRange.from(0, 0);

plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/references/SelfReference.java

@@ -41,10 +41,12 @@ class SelfReference implements PsiReference {
     this(element, target, 0);
   }
 
+  @NotNull
   public PsiElement getElement() {
     return myValue;
   }
 
+  @NotNull
   public TextRange getRangeInElement() {
     return TextRange.from(1 + myStartOffset, myValue.getTextLength() - (2 + myStartOffset));
   }

plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/references/SimpleAttributeReference.java

@@ -37,12 +37,14 @@ abstract class SimpleAttributeReference implements PsiReference {
         return getTextRange().substring(myAttribute.getValue());
     }
 
+    @NotNull
     public PsiElement getElement() {
         final XmlAttributeValue value = myAttribute.getValueElement();
         assert value != null;
         return value;
     }
 
+    @NotNull
     public TextRange getRangeInElement() {
         return getTextRange().shiftRight(1);
     }

python/src/com/jetbrains/python/BaseReference.java

@@ -32,10 +32,12 @@ public abstract class BaseReference implements PsiReference, PyUserInitiatedReso
     myElement = element;
   }
 
+  @NotNull
   public PsiElement getElement() {
     return myElement;
   }
 
+  @NotNull
   public TextRange getRangeInElement() {
     return new TextRange(0, myElement.getTextLength());
   }

python/src/com/jetbrains/python/PyStringLiteralReference.java

@@ -35,6 +35,7 @@ public abstract class PyStringLiteralReference extends BaseReference {
     myStringLiteral = element;
   }
 
+  @NotNull
   @SuppressWarnings("RefusedBequest") // 1 instead of 1 in range and "-1" at the end because we do not need quotes
   @Override
   public final TextRange getRangeInElement() {

python/src/com/jetbrains/python/buildout/config/ref/BuildoutPartReference.java

@@ -41,6 +41,7 @@ public class BuildoutPartReference extends PsiReferenceBase<PsiElement> {
     myOffsetInElement = offsetInElement;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return TextRange.from(myOffsetInElement, myPartName.length());

python/src/com/jetbrains/python/psi/impl/references/PyReferenceImpl.java

@@ -51,6 +51,7 @@ public class PyReferenceImpl implements PsiReferenceEx, PsiPolyVariantReference
     myContext = context;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final ASTNode nameElement = myElement.getNameElement();
@@ -58,6 +59,7 @@ public class PyReferenceImpl implements PsiReferenceEx, PsiPolyVariantReference
     return range.shiftRight(-myElement.getNode().getStartOffset());
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myElement;

xml/dom-tests/tests/com/intellij/util/xml/DomReferenceInjectorTest.java

@@ -418,11 +418,13 @@ public class DomReferenceInjectorTest extends DomHardCoreTestCase {
 
       return new PsiReference[] {
         new PsiReference() {
+          @NotNull
           @Override
           public PsiElement getElement() {
             return element;
           }
 
+          @NotNull
           @Override
           public TextRange getRangeInElement() {
             return refRange;

xml/impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/DtdReferencesProvider.java

@@ -65,11 +65,13 @@ public class DtdReferencesProvider extends PsiReferenceProvider {
 
     }
 
+    @NotNull
     @Override
     public PsiElement getElement() {
       return myElement;
     }
 
+    @NotNull
     @Override
     public TextRange getRangeInElement() {
       return myRange;
@@ -168,11 +170,13 @@ public class DtdReferencesProvider extends PsiReferenceProvider {
       }
     }
 
+    @NotNull
     @Override
     public PsiElement getElement() {
       return myElement;
     }
 
+    @NotNull
     @Override
     public TextRange getRangeInElement() {
       return myRange;

xml/impl/src/com/intellij/xml/util/AnchorReferenceImpl.java

@@ -41,7 +41,7 @@ public class AnchorReferenceImpl implements AnchorReference, PsiReference, Empty
   @NonNls private static final String MAP_ELEMENT_NAME = "map";
   private static final Key<CachedValue<Map<String,XmlTag>>> ourCachedIdsKey = Key.create("cached.ids");
 
-  AnchorReferenceImpl(final String anchor, @Nullable final FileReference psiReference, final PsiElement element, final int offset,
+  AnchorReferenceImpl(final String anchor, @Nullable final FileReference psiReference, @NotNull final PsiElement element, final int offset,
                       final boolean soft) {
 
     myAnchor = anchor;
@@ -51,11 +51,13 @@ public class AnchorReferenceImpl implements AnchorReference, PsiReference, Empty
     mySoft = soft;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myElement;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return new TextRange(myOffset,myOffset+myAnchor.length());

xml/relaxng/src/org/intellij/plugins/relaxNG/compact/psi/impl/PatternReference.java

@@ -53,6 +53,7 @@ class PatternReference extends PsiReferenceBase.Poly<RncRef> implements Function
     super(ref);
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final ASTNode node = findNameNode();

xml/relaxng/src/org/intellij/plugins/relaxNG/compact/psi/impl/RncNameImpl.java

@@ -84,11 +84,13 @@ public class RncNameImpl extends RncElementImpl implements RncName, PsiReference
     return getPrefix() == null ? null : this;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return this;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return TextRange.from(0, getText().indexOf(':'));

xml/xml-psi-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/BasicAttributeValueReference.java

@@ -49,10 +49,12 @@ public abstract class BasicAttributeValueReference implements PsiReference {
     myRange = range;
   }
 
+  @NotNull
   public PsiElement getElement() {
     return myElement;
   }
 
+  @NotNull
   public TextRange getRangeInElement() {
     return myRange;
   }

xml/xml-psi-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/SchemaReferencesProvider.java

@@ -71,11 +71,13 @@ public class SchemaReferencesProvider extends PsiReferenceProvider {
       myElement = element;
     }
 
+    @NotNull
     @Override
     public PsiElement getElement() {
       return myElement;
     }
 
+    @NotNull
     @Override
     public TextRange getRangeInElement() {
       return ElementManipulators.getValueTextRange(myElement);

xml/xml-psi-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/TypeOrElementOrAttributeReference.java

@@ -111,11 +111,13 @@ public class TypeOrElementOrAttributeReference implements PsiReference {
     return null;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myElement;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return myRange;

xml/xml-psi-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/URLReference.java

@@ -57,11 +57,13 @@ public class URLReference implements PsiReference, EmptyResolveMessageProvider {
     mySoft = soft;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myElement;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return myRange != null ? myRange : ElementManipulators.getValueTextRange(myElement);

xml/xml-psi-impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/XmlValueReference.java

@@ -36,11 +36,13 @@ public abstract class XmlValueReference implements PsiReference {
     myRange = ElementManipulators.getValueTextRange(tag);
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     return myTag;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     return myRange;

xml/xml-psi-impl/src/com/intellij/psi/impl/source/xml/TagNameReference.java

@@ -45,6 +45,7 @@ public class TagNameReference implements PsiReference {
     myNameElement = nameElement;
   }
 
+  @NotNull
   @Override
   public PsiElement getElement() {
     PsiElement element = myNameElement.getPsi();
@@ -59,6 +60,7 @@ public class TagNameReference implements PsiReference {
     return (XmlTag)element;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final ASTNode nameElement = getNameElement();

xml/xml-psi-impl/src/com/intellij/psi/impl/source/xml/XmlAttributeReference.java

@@ -43,11 +43,13 @@ public class XmlAttributeReference implements PsiReference {
     myAttribute = attribute;
   }
 
+  @NotNull
   @Override
   public XmlAttribute getElement() {
     return myAttribute;
   }
 
+  @NotNull
   @Override
   public TextRange getRangeInElement() {
     final int parentOffset = myAttribute.getNameElement().getStartOffsetInParent();

xml/xml-psi-impl/src/com/intellij/psi/impl/source/xml/XmlDoctypeImpl.java

@@ -245,6 +245,7 @@ public class XmlDoctypeImpl extends XmlElementImpl implements XmlDoctype {
       public String getCanonicalText() {
         return extractValue(dtdUrlElement);
       }
+      @NotNull
       @Override
       public TextRange getRangeInElement() {
         return TextRange.from(dtdUrlElement.getTextRange().getStartOffset() - getTextRange().getStartOffset() + 1, Math.max(dtdUrlElement.getTextRange().getLength() - 2, 0));