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package com.github.antelopeframework.mybatis.criterion;

import lombok.Getter;

/**
 * Constrains a property to be null
 * 
 * @author yangzhi.yzh
 *
 */
@Getter
public class NullExpression implements Criterion {
	private static final long serialVersionUID = 1L;

	private final String column;
	
	/**
	 * Constructs a NullExpression
	 *
	 * @param column The name of the property to check for null
	 *
	 * @see Restrictions#isNull
	 */
	protected NullExpression(String column) {
		this.column = column;
	}
	
	@Override
	public String toSqlString(CriteriaQuery criteriaQuery) {
		return column + " is null";
	}

	@Override
	public TypedValue[] getTypedValues(CriteriaQuery criteriaQuery) {
		return NO_VALUES;
	}
	
	@Override
	public String toString() {
		return column + " is null";
	}

}