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SPL(Structured Process Language) A programming language specially for structured data computing.

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package com.scudata.expression;

import com.scudata.dm.Canvas;

/**
 * Canvas.f() ??????Ա??????Ҫ?̳д???
 * @author Joancy
 *
 */
public abstract class CanvasFunction extends MemberFunction {
	protected Canvas canvas; // ????
	
	public boolean isLeftTypeMatch(Object obj) {
		return obj instanceof Canvas;
	}
	
	public void setDotLeftObject(Object obj) {
		canvas = (Canvas)obj;
	}
	
	/**
	 * ?ͷŽڵ????õĵ?????????Ķ???
	 */
	public void releaseDotLeftObject() {
		canvas = null;
	}
}