com.dahuatech.hutool.core.map.CaseInsensitiveMap Maven / Gradle / Ivy

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package com.dahuatech.hutool.core.map;

import java.util.HashMap;
import java.util.Map;

/**
 * 忽略大小写的Map

 * 对KEY忽略大小写，get("Value")和get("value")获得的值相同，put进入的值也会被覆盖
 *
 * @author Looly
 * @param  键类型
 * @param  值类型
 * @since 3.0.2
 */
public class CaseInsensitiveMap extends CustomKeyMap {
  private static final long serialVersionUID = 4043263744224569870L;

  // ------------------------------------------------------------------------- Constructor start
  /** 构造 */
  public CaseInsensitiveMap() {
    this(DEFAULT_INITIAL_CAPACITY);
  }

  /**
   * 构造
   *
   * @param initialCapacity 初始大小
   */
  public CaseInsensitiveMap(int initialCapacity) {
    this(initialCapacity, DEFAULT_LOAD_FACTOR);
  }

  /**
   * 构造
   *
   * @param m Map
   */
  public CaseInsensitiveMap(Map m) {
    this(DEFAULT_LOAD_FACTOR, m);
  }

  /**
   * 构造
   *
   * @param loadFactor 加载因子
   * @param m Map
   * @since 3.1.2
   */
  public CaseInsensitiveMap(float loadFactor, Map m) {
    this(m.size(), loadFactor);
    this.putAll(m);
  }

  /**
   * 构造
   *
   * @param initialCapacity 初始大小
   * @param loadFactor 加载因子
   */
  public CaseInsensitiveMap(int initialCapacity, float loadFactor) {
    super(new HashMap(initialCapacity, loadFactor));
  }
  // ------------------------------------------------------------------------- Constructor end

  /**
   * 将Key转为小写
   *
   * @param key KEY
   * @return 小写KEY
   */
  @Override
  protected Object customKey(Object key) {
    if (null != key && key instanceof CharSequence) {
      key = key.toString().toLowerCase();
    }
    return key;
  }
}