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 * Copyright (c) 2018, TechEmpower, Inc.
 * All rights reserved.
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 *       contributors may be used to endorse or promote products derived from
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 *
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 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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package com.techempower.js.legacy;

import java.util.*;

/**
 * Makes visitors for maps.
 */
enum MapVisitorFactory implements VisitorFactory
{
  INSTANCE;

  @Override
  public Visitor visitor(final Object object)
  {
    if (!(object instanceof Map))
    {
      throw new IllegalArgumentException("Argument is not a map.");
    }
    return new MapEntryIteratorVisitor<>(
        ((Map) object).entrySet().iterator());
  }

  /**
   * The Map Visitor implementation.
   */
  private static final class MapEntryIteratorVisitor implements Visitor
  {
    private final Iterator> iterator;
    private Map.Entry entry;

    private MapEntryIteratorVisitor(Iterator> iterator)
    {
      this.iterator = iterator;
    }

    @Override
    public boolean hasNext()
    {
      return this.iterator.hasNext();
    }

    @Override
    public boolean isArray()
    {
      return false;
    }

    @Override
    public String name()
    {
      return String.valueOf(this.entry.getKey());
    }

    @Override
    public void next()
    {
      this.entry = this.iterator.next();
    }

    @Override
    public Object value()
    {
      return this.entry.getValue();
    }
  }
}
    

    

    

            

    

            



    
    






    
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