StubParentStrategy: equals() performance

use DomStub information instead of accessing XML

xml/dom-impl/src/com/intellij/util/xml/stubs/DomStub.java

@@ -134,4 +134,24 @@ public abstract class DomStub extends ObjectStubBase<DomStub> {
   }
 
   public abstract int getIndex();
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) return true;
+    if (o == null || getClass() != o.getClass()) return false;
+
+    DomStub stub = (DomStub)o;
+    if (stub.getIndex() != getIndex()) return false;
+    if (stub.isCustom() != isCustom()) return false;
+
+    return Comparing.strEqual(stub.getName(), getName()) &&
+           Comparing.strEqual(stub.getNamespaceKey(), getNamespaceKey());
+  }
+
+  @Override
+  public int hashCode() {
+    int result = myLocalName.hashCode();
+    result = 31 * result + myNamespace.hashCode();
+    return result;
+  }
 }

xml/dom-impl/src/com/intellij/util/xml/stubs/StubParentStrategy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2012 JetBrains s.r.o.
+ * Copyright 2000-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@
 package com.intellij.util.xml.stubs;
 
 import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.util.Comparing;
 import com.intellij.psi.xml.XmlElement;
 import com.intellij.psi.xml.XmlFile;
 import com.intellij.psi.xml.XmlTag;
@@ -139,7 +140,19 @@ public class StubParentStrategy implements DomParentStrategy {
   @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
   @Override
   public boolean equals(Object obj) {
-    return PhysicalDomParentStrategy.strategyEquals(this, obj);
+    if (!(obj instanceof StubParentStrategy)) {
+      return PhysicalDomParentStrategy.strategyEquals(this, obj);
+    }
+
+    if (obj == this) return true;
+
+    StubParentStrategy other = (StubParentStrategy)obj;
+    if (!other.getClass().equals(getClass())) return false;
+
+    if (!other.myStub.equals(myStub)) return false;
+
+    return Comparing.equal(getContainingFile(myStub.getHandler()),
+                           other.getContainingFile(other.myStub.getHandler()));
   }
 
   public static class Empty extends StubParentStrategy {