studio.raptor.sqlparser.fast.util.New Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
 * and the EPL 1.0 (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package studio.raptor.sqlparser.fast.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;

/**
 * This class contains static methods to construct commonly used generic objects
 * such as ArrayList.
 */
public class New {

  /**
   * Create a new ArrayList.
   *
   * @param  the type
   * @return the object
   */
  public static  ArrayList arrayList() {
    return new ArrayList<>(4);
  }

  /**
   * Create a new HashMap.
   *
   * @param  the key type
   * @param  the value type
   * @return the object
   */
  public static  HashMap hashMap() {
    return new HashMap<>();
  }

  /**
   * Create a new HashMap.
   *
   * @param  the key type
   * @param  the value type
   * @param initialCapacity the initial capacity
   * @return the object
   */
  public static  HashMap hashMap(int initialCapacity) {
    return new HashMap<>(initialCapacity);
  }

  /**
   * Create a new HashSet.
   *
   * @param  the type
   * @return the object
   */
  public static  HashSet hashSet() {
    return new HashSet<>();
  }

  /**
   * Create a new ArrayList.
   *
   * @param  the type
   * @param c the collection
   * @return the object
   */
  public static  ArrayList arrayList(Collection c) {
    return new ArrayList<>(c);
  }

  /**
   * Create a new ArrayList.
   *
   * @param  the type
   * @param initialCapacity the initial capacity
   * @return the object
   */
  public static  ArrayList arrayList(int initialCapacity) {
    return new ArrayList<>(initialCapacity);
  }

}