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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * 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. See accompanying
 * LICENSE file.
 */
package com.gemstone.gemfire.internal.size;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;

import junit.framework.Assert;
import junit.framework.TestCase;

public class ObjectTraverserJUnitTest extends TestCase {
  
  public void testBasic() throws IllegalArgumentException, IllegalAccessException {
    
    Set testData = new HashSet();
    Object one = new Object();
    testData.add(one);
    Object[] two = new Object[2];
    testData.add(two);
    ArrayList three = new ArrayList();
    two[0]= three;
    three.add(testData);
    
    TestVisitor visitor = new TestVisitor();
    ObjectTraverser.breadthFirstSearch(testData, visitor, false);
    
    Assert.assertNotNull(visitor.visited.remove(testData));
    Assert.assertNotNull(visitor.visited.remove(one));
    Assert.assertNotNull(visitor.visited.remove(two));
    Assert.assertNotNull(visitor.visited.remove(three));
  }
  
  public void testStatics() throws IllegalArgumentException, IllegalAccessException {
   
    final Object staticObject = new Object();
    TestObject1.test2 = staticObject;
    TestObject1 test1 = new TestObject1();
    
    TestVisitor visitor = new TestVisitor();
    ObjectTraverser.breadthFirstSearch(test1, visitor, false);
    Assert.assertNull(visitor.visited.get(staticObject));
    
    visitor = new TestVisitor();
    ObjectTraverser.breadthFirstSearch(test1, visitor, true);
    Assert.assertNotNull(visitor.visited.get(staticObject));
  }
  
  public void testStop() throws IllegalArgumentException, IllegalAccessException {
    Set set1 = new HashSet();
    final Set set2 = new HashSet();
    Object object3 = new Object();
    set1.add(set2);
    set2.add(object3);
    
    
    
    TestVisitor visitor = new TestVisitor();
    visitor = new TestVisitor() {
      public boolean visit(Object parent, Object object) {
        super.visit(parent, object);
        return object != set2;
      }
    };
    
    ObjectTraverser.breadthFirstSearch(set1, visitor, true);
    
    Assert.assertNotNull(visitor.visited.get(set1));
    Assert.assertNotNull(visitor.visited.get(set2));
    Assert.assertNull(visitor.visited.get(object3));
  }
  
  /** This test is commented out because it needs to be verified manually */
  public void z_testHistogram() throws IllegalArgumentException, IllegalAccessException {
    
    Set set1 = new HashSet();
    final Set set2 = new HashSet();
    Object object3 = new Object();
    set1.add(set2);
    set2.add(object3);
    
    System.setProperty("gemfire.ObjectSizer.SIZE_OF_CLASS", "com.gemstone.gemfire.internal.size.SizeOfUtil0");
    System.out.println(ObjectGraphSizer.histogram(set1, true));
  }
  
  private static class TestVisitor implements ObjectTraverser.Visitor {
    private static final Object VALUE = new Object();
    
    public Map visited = new IdentityHashMap();

    public boolean visit(Object parent, Object object) {
      Assert.assertNull(visited.put(object, VALUE));
      return true;
    }
  }
  
  private static class TestObject1 {
    protected static Object test2;
  }
  
}