Spring EnumerablePropertySource

	public abstract String[] getPropertyNames();

public abstract class EnumerablePropertySource<T> extends PropertySource<T> {

	public EnumerablePropertySource(String name, T source) {
		super(name, source);
	}

	protected EnumerablePropertySource(String name) {
		super(name);
	}


	/**
	 * Return whether this {@code PropertySource} contains a property with the given name.
	 * <p>This implementation checks for the presence of the given name within the
	 * {@link #getPropertyNames()} array.
	 *
	 * 在属性列表中是否存在 properties 
	 * @param name the name of the property to find
	 */
	@Override
	public boolean containsProperty(String name) {
		return ObjectUtils.containsElement(getPropertyNames(), name);
	}

	/**
	 * Return the names of all properties contained by the
	 * 获取所有的 properties 名称
	 * {@linkplain #getSource() source} object (never {@code null}).
	 */
	public abstract String[] getPropertyNames();

}