monitorfilereads.aj

来自「designpatterns for aop」· AJ 代码 · 共 29 行

package designpatterns.decorator.aspectjwrap;

import java.io.InputStream;

import javax.swing.JComponent;
import javax.swing.ProgressMonitorInputStream;



public aspect MonitorFileReads {

	pointcut constructionOfInputStream(JComponent component):
		execution(InputStream designpatterns.decorator.java.*.*())
		&& cflow(execution(* javax.swing.JComponent+.*(..))
				&& this(component));
	
	InputStream around(JComponent component) : constructionOfInputStream(component){
		InputStream is = proceed(component);
		// a real system would need to add a more sophisticated
		// check to prevent double-wrapping
		if(! (is instanceof ProgressMonitorInputStream) ){
			is = new ProgressMonitorInputStream(component, "PM: AJ Wrap", is);
		}
		return is;
	}
	
	
}