/*
 * Copyright 2013-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package com.facebook.buck.rules;

import com.google.common.base.Preconditions;

import java.util.Objects;

/**
 * Abstract base class for implementations of {@link SourcePath}.
 */
abstract class AbstractSourcePath<T extends AbstractSourcePath<T>> implements SourcePath {

  /**
   * @return An opaque representation of the source path in a stable manner.
   */
  protected abstract Object asReference();

  protected abstract int compareReferences(T o);

  @SuppressWarnings("unchecked")
  @Override
  public int compareTo(SourcePath o) {
    if (o == this) {
      return 0;
    }

    int result = this.getClass().getName().compareTo(o.getClass().getName());
    if (result != 0) {
      return result;
    }

    Preconditions.checkState(
        this.getClass().equals(o.getClass()),
        "Classes are different but have the same name.");

    return this.compareReferences((T) o);
  }

  @Override
  public int hashCode() {
    return asReference().hashCode();
  }

  @Override
  public boolean equals(Object other) {
    if (other == null || !(other instanceof AbstractSourcePath)) {
      return false;
    }

    AbstractSourcePath<?> that = (AbstractSourcePath<?>) other;

    return Objects.equals(this.asReference(), that.asReference());
  }

  @Override
  public String toString() {
    return String.valueOf(asReference());
  }
}

@@ -1180,24 +1180,69 @@
 n 0;%0A    %7D%0A%0A
+    if (this.getClass() != o.getClass()) %7B%0A  
     int resu
@@ -1307,24 +1307,26 @@
 ame());%0A    
+  
 if (result !
@@ -1334,24 +1334,26 @@
  0) %7B%0A      
+ 
+ 
 return resul
@@ -1359,23 +1359,27 @@
 lt;%0A    
+  
 %7D%0A%0A    
+ 
+ 
 Precondi
@@ -1396,16 +1396,18 @@
 kState(%0A
+  
         
@@ -1452,16 +1452,18 @@
         
+ 
+ 
 %22Classes
@@ -1503,16 +1503,22 @@
 name.%22);
+%0A    %7D
 %0A%0A    re

Optimize AbstractSourcePath.compareTo