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1.0 初版 1.1 增加了event的flag和custom_attr字段。 1.2 规范了api的命名

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package com.envision.eos.event.api.expression;

import java.io.IOException;

import com.envision.eos.event.api.bo.EventVisitor;
import com.envision.eos.event.api.expression.Column.DataType;

public class HourExpr extends Expression{

	private static final long serialVersionUID = 1L;
	private Column column;
	public HourExpr(Column column) {
		if(column.getDataType()!=DataType.TIME) {
			throw new IllegalArgumentException(
					"This column does not apply to hour() functions because it is not a date time");
		}
		this.column=column;
	}
	public HourExpr() {
		
	}

	public Column getColumn() {
		return column;
	}
	public void setColumn(Column column) {
		this.column = column;
	}
	@Override
	public void accept(EventVisitor visitor) throws IOException {
		visitor.visit(this);
		
	}

}