hashCode, equals, toString for JavaElement

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/structure/JavaElementImpl.java

@@ -31,4 +31,19 @@ public abstract class JavaElementImpl implements JavaElement {
     public PsiElement getPsi() {
         return psiElement;
     }
+
+    @Override
+    public int hashCode() {
+        return getPsi().hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof JavaElement && getPsi().equals(((JavaElement) obj).getPsi());
+    }
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName() + ": " + getPsi();
+    }
 }

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/structure/JavaType.java

@@ -67,8 +67,18 @@ public abstract class JavaType {
         });
     }
 
+    @Override
+    public int hashCode() {
+        return getPsi().hashCode();
+    }
+
     @Override
     public boolean equals(Object obj) {
         return obj instanceof JavaType && getPsi().equals(((JavaType) obj).getPsi());
     }
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName() + ": " + getPsi();
+    }
 }

compiler/frontend.java/src/org/jetbrains/jet/lang/resolve/java/structure/JavaTypeSubstitutor.java

@@ -33,6 +33,21 @@ public class JavaTypeSubstitutor {
 
     @NotNull
     public JavaType substitute(@NotNull JavaType type) {
-        return JavaType.create(psiSubstitutor.substitute(type.getPsi()));
+        return JavaType.create(getPsi().substitute(type.getPsi()));
+    }
+
+    @Override
+    public int hashCode() {
+        return getPsi().hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof JavaTypeSubstitutor && getPsi().equals(((JavaTypeSubstitutor) obj).getPsi());
+    }
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName() + ": " + getPsi();
     }
 }