com.sencha.gxt.core.shared.FastSet Maven / Gradle / Ivy

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/**
 * Sencha GXT 3.1.0-beta - Sencha for GWT
 * Copyright(c) 2007-2014, Sencha, Inc.
 * [email protected]
 *
 * http://www.sencha.com/products/gxt/license/
 */
package com.sencha.gxt.core.shared;

import java.io.Serializable;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Map;

public class FastSet extends AbstractSet implements Serializable {
  private Map map;
  private static final String PRESENT = "";

  public FastSet() {
    map = new FastMap();
  }

  @Override
  public boolean add(String s) {
    return map.put(s, PRESENT) == null;
  }

  @Override
  public void clear() {
    map.clear();
  }

  @Override
  public boolean contains(Object o) {
    return map.containsKey(o);
  }

  @Override
  public boolean isEmpty() {
    return map.isEmpty();
  }

  @Override
  public Iterator iterator() {
    return map.keySet().iterator();
  }

  @Override
  public boolean remove(Object o) {
    String s = map.remove(o);
    return s != null && s.equals(PRESENT);
  }

  @Override
  public int size() {
    return map.size();
  }

}