Got rid of storing diagnostic messages inside them: now they are generated on demand.

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/AbstractDiagnostic.java

@@ -25,15 +25,15 @@ import org.jetbrains.annotations.NotNull;
  */
 public abstract class AbstractDiagnostic<E extends PsiElement> implements ParametrizedDiagnostic<E> {
     private final E psiElement;
-    private final String message;
     private final AbstractDiagnosticFactory factory;
     private final Severity severity;
 
-    public AbstractDiagnostic(@NotNull E psiElement, @NotNull AbstractDiagnosticFactory factory, @NotNull Severity severity, @NotNull String message) {
+    public AbstractDiagnostic(@NotNull E psiElement,
+            @NotNull AbstractDiagnosticFactory factory,
+            @NotNull Severity severity) {
         this.psiElement = psiElement;
         this.factory = factory;
         this.severity = severity;
-        this.message = message;
     }
 
     @NotNull
@@ -48,12 +48,6 @@ public abstract class AbstractDiagnostic<E extends PsiElement> implements Parame
         return psiElement.getContainingFile();
     }
 
-    @NotNull
-    @Override
-    public String getMessage() {
-        return message;
-    }
-
     @NotNull
     @Override
     public Severity getSeverity() {

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/DiagnosticFactory.java

@@ -38,8 +38,12 @@ public class DiagnosticFactory<E extends PsiElement> extends DiagnosticFactoryWi
         return new DiagnosticFactory<T>(severity, message, positioningStrategy);
     }
 
+    String getMessage() {
+        return message;
+    }
+
     @NotNull
     public ParametrizedDiagnostic<E> on(@NotNull E element) {
-        return new DiagnosticWithPsiElement<E>(element, this, severity, message);
+        return new DiagnosticWithPsiElement<E>(element, this, severity);
     }
 }

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/DiagnosticFactory1.java

@@ -35,7 +35,7 @@ public class DiagnosticFactory1<E extends PsiElement, A> extends DiagnosticFacto
     
     @NotNull
     public ParametrizedDiagnostic<E> on(@NotNull E element, @NotNull A argument) {
-        return new DiagnosticWithParameters1<E, A>(element, argument, this, severity, makeMessage(argument));
+        return new DiagnosticWithParameters1<E, A>(element, argument, this, severity);
     }
 
     protected DiagnosticFactory1(Severity severity, String message, PositioningStrategy<? super E> positioningStrategy, Renderer<? super A> renderer) {

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/DiagnosticFactory2.java

@@ -26,7 +26,7 @@ public class DiagnosticFactory2<E extends PsiElement, A, B> extends DiagnosticFa
     private final Renderer<? super A> rendererForA;
     private final Renderer<? super B> rendererForB;
 
-    private String makeMessage(@NotNull A a, @NotNull B b) {
+    protected String makeMessage(@NotNull A a, @NotNull B b) {
         return messageFormat.format(new Object[] {makeMessageForA(a), makeMessageForB(b)});
     }
 
@@ -40,7 +40,7 @@ public class DiagnosticFactory2<E extends PsiElement, A, B> extends DiagnosticFa
 
     @NotNull
     public ParametrizedDiagnostic<E> on(@NotNull E element, @NotNull A a, @NotNull B b) {
-        return new DiagnosticWithParameters2<E, A, B>(element, a, b, this, severity, makeMessage(a, b));
+        return new DiagnosticWithParameters2<E, A, B>(element, a, b, this, severity);
     }
 
 

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/DiagnosticFactory3.java

@@ -50,7 +50,7 @@ public class DiagnosticFactory3<E extends PsiElement, A, B, C> extends Diagnosti
         return new DiagnosticFactory3<T, A, B, C>(severity, messageStub, positioningStrategy, rendererForA, rendererForB, rendererForC);
     }
 
-    private String makeMessage(@NotNull A a, @NotNull B b, @NotNull C c) {
+    protected String makeMessage(@NotNull A a, @NotNull B b, @NotNull C c) {
         return messageFormat.format(new Object[]{makeMessageForA(a), makeMessageForB(b), makeMessageForC(c)});
     }
 
@@ -67,6 +67,6 @@ public class DiagnosticFactory3<E extends PsiElement, A, B, C> extends Diagnosti
     }
     @NotNull
     public ParametrizedDiagnostic<E> on(@NotNull E element, @NotNull A a, @NotNull B b, @NotNull C c) {
-        return new DiagnosticWithParameters3<E, A, B, C>(element, a, b, c, this, severity, makeMessage(a, b, c));
+        return new DiagnosticWithParameters3<E, A, B, C>(element, a, b, c, this, severity);
     }
 }

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/DiagnosticWithParameters1.java

@@ -32,9 +32,8 @@ public class DiagnosticWithParameters1<E extends PsiElement, A> extends Abstract
     public DiagnosticWithParameters1(@NotNull E psiElement,
             @NotNull A a,
             @NotNull DiagnosticFactory1<E, A> factory,
-            @NotNull Severity severity,
+            @NotNull Severity severity) {
-            @NotNull String message) {
+        super(psiElement, factory, severity);
-        super(psiElement, factory, severity, message);
         this.a = a;
     }
 
@@ -44,6 +43,12 @@ public class DiagnosticWithParameters1<E extends PsiElement, A> extends Abstract
         return (DiagnosticFactory1<E, A>)super.getFactory();
     }
 
+    @NotNull
+    @Override
+    public String getMessage() {
+        return getFactory().makeMessage(a);
+    }
+
     @Override
     @NotNull
     public List<TextRange> getTextRanges() {

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/DiagnosticWithParameters2.java

@@ -34,9 +34,8 @@ public class DiagnosticWithParameters2<E extends PsiElement, A, B> extends Abstr
             @NotNull A a,
             @NotNull B b,
             @NotNull DiagnosticFactory2<E, A, B> factory,
-            @NotNull Severity severity,
+            @NotNull Severity severity) {
-            @NotNull String message) {
+        super(psiElement, factory, severity);
-        super(psiElement, factory, severity, message);
         this.a = a;
         this.b = b;
     }
@@ -47,6 +46,12 @@ public class DiagnosticWithParameters2<E extends PsiElement, A, B> extends Abstr
         return (DiagnosticFactory2<E, A, B>)super.getFactory();
     }
 
+    @NotNull
+    @Override
+    public String getMessage() {
+        return getFactory().makeMessage(a, b);
+    }
+
     @Override
     @NotNull
     public List<TextRange> getTextRanges() {

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/DiagnosticWithParameters3.java

@@ -36,9 +36,8 @@ public class DiagnosticWithParameters3<E extends PsiElement, A, B, C> extends Ab
             @NotNull B b,
             @NotNull C c,
             @NotNull DiagnosticFactory3<E, A, B, C> factory,
-            @NotNull Severity severity,
+            @NotNull Severity severity) {
-            @NotNull String message) {
+        super(psiElement, factory, severity);
-        super(psiElement, factory, severity, message);
         this.a = a;
         this.b = b;
         this.c = c;
@@ -50,6 +49,12 @@ public class DiagnosticWithParameters3<E extends PsiElement, A, B, C> extends Ab
         return (DiagnosticFactory3<E, A, B, C>)super.getFactory();
     }
 
+    @NotNull
+    @Override
+    public String getMessage() {
+        return getFactory().makeMessage(a, b, c);
+    }
+
     @Override
     @NotNull
     public List<TextRange> getTextRanges() {

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/DiagnosticWithPsiElement.java

@@ -26,14 +26,22 @@ import java.util.List;
  * @author svtk
  */
 public class DiagnosticWithPsiElement<E extends PsiElement> extends AbstractDiagnostic<E> {
-    public DiagnosticWithPsiElement(@NotNull E psiElement, @NotNull DiagnosticFactoryWithPsiElement<E> factory, @NotNull Severity severity, @NotNull String message) {
+    public DiagnosticWithPsiElement(@NotNull E psiElement,
-        super(psiElement, factory, severity, message);
+            @NotNull DiagnosticFactory<E> factory,
+            @NotNull Severity severity) {
+        super(psiElement, factory, severity);
     }
 
     @NotNull
     @Override
-    public DiagnosticFactoryWithPsiElement<E> getFactory() {
+    public DiagnosticFactory<E> getFactory() {
-        return (DiagnosticFactoryWithPsiElement<E>)super.getFactory();
+        return (DiagnosticFactory<E>)super.getFactory();
+    }
+
+    @NotNull
+    @Override
+    public String getMessage() {
+        return getFactory().getMessage();
     }
 
     @Override

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/RedeclarationDiagnostic.java

@@ -33,9 +33,23 @@ import java.util.List;
  */
 public interface RedeclarationDiagnostic extends Diagnostic {
     class SimpleRedeclarationDiagnostic extends AbstractDiagnostic<PsiElement> implements RedeclarationDiagnostic {
+        private String name;
 
         public SimpleRedeclarationDiagnostic(@NotNull PsiElement psiElement, @NotNull String name, RedeclarationDiagnosticFactory factory) {
-            super(psiElement, factory, factory.severity, factory.makeMessage(name));
+            super(psiElement, factory, factory.severity);
+            this.name = name;
+        }
+
+        @NotNull
+        @Override
+        public RedeclarationDiagnosticFactory getFactory() {
+            return (RedeclarationDiagnosticFactory)super.getFactory();
+        }
+
+        @NotNull
+        @Override
+        public String getMessage() {
+            return getFactory().makeMessage(name);
         }
 
         @NotNull

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/UnresolvedReferenceDiagnostic.java

@@ -30,15 +30,21 @@ import static org.jetbrains.jet.lang.diagnostics.Severity.ERROR;
  * @author abreslav
  */
 public class UnresolvedReferenceDiagnostic extends AbstractDiagnostic<JetReferenceExpression> {
+    @NotNull
+    @Override
+    public UnresolvedReferenceDiagnosticFactory getFactory() {
+        return (UnresolvedReferenceDiagnosticFactory)super.getFactory();
+    }
 
-    public UnresolvedReferenceDiagnostic(JetReferenceExpression referenceExpression, String message) {
+    public UnresolvedReferenceDiagnostic(@NotNull JetReferenceExpression referenceExpression,
-        super(referenceExpression, Errors.UNRESOLVED_REFERENCE, ERROR, message);
+            @NotNull UnresolvedReferenceDiagnosticFactory factory) {
+        super(referenceExpression, factory, ERROR);
     }
 
     @NotNull
     @Override
     public String getMessage() {
-        return super.getMessage() + ": " + getPsiElement().getText();
+        return getFactory().getMessage() + ": " + getPsiElement().getText();
     }
 
     @NotNull

compiler/frontend/src/org/jetbrains/jet/lang/diagnostics/UnresolvedReferenceDiagnosticFactory.java

@@ -16,28 +16,25 @@
 
 package org.jetbrains.jet.lang.diagnostics;
 
-import com.intellij.openapi.util.TextRange;
-import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.jet.lang.psi.JetArrayAccessExpression;
 import org.jetbrains.jet.lang.psi.JetReferenceExpression;
-import org.jetbrains.jet.lang.psi.JetSimpleNameExpression;
-
-import java.util.List;
 
 /**
  * @author abreslav
  */
 public class UnresolvedReferenceDiagnosticFactory extends AbstractDiagnosticFactory {
-
     private final String message;
 
     private UnresolvedReferenceDiagnosticFactory(String message) {
         this.message = message;
     }
 
+    String getMessage() {
+        return message;
+    }
+
     public UnresolvedReferenceDiagnostic on(@NotNull JetReferenceExpression reference) {
-        return new UnresolvedReferenceDiagnostic(reference, message);
+        return new UnresolvedReferenceDiagnostic(reference, this);
     }
 
     public static UnresolvedReferenceDiagnosticFactory create(String message) {

compiler/testData/diagnostics/tests/NamedArgumentsAndDefaultValues.jet

@@ -19,5 +19,5 @@ fun test() {
     bar(1, 1, "")
     bar(1, 1, "")
     bar(1, <!MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>z<!> = "")
-    bar<!NO_VALUE_FOR_PARAMETER!>(1, <!UNRESOLVED_REFERENCE, MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>zz<!> = "", <!MIXING_NAMED_AND_POSITIONED_ARGUMENTS!><!UNRESOLVED_REFERENCE!>zz<!>.foo<!>)<!>
+    bar<!NO_VALUE_FOR_PARAMETER!>(1, <!NAMED_PARAMETER_NOT_FOUND, MIXING_NAMED_AND_POSITIONED_ARGUMENTS!>zz<!> = "", <!MIXING_NAMED_AND_POSITIONED_ARGUMENTS!><!UNRESOLVED_REFERENCE!>zz<!>.foo<!>)<!>
 }