cacheimage.java

有限自动机输入,转换,识别,图形显示与化简

package cn.work.zdj.sys;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.plugin.AbstractUIPlugin;

public class CacheImage {
	private final Map<String,Image> imageMap = new HashMap<String,Image>();
	private static CacheImage INSTANCE = new CacheImage();
	
	private CacheImage(){};
	public static CacheImage getINSTANCE(){
		return INSTANCE;
	}
	
	public Image getImage(String applicationID,String imageName){
		if(imageName == null){
			return null;
		}
		Image image = (Image)imageMap.get(imageName);
		if(image == null){
			image = AbstractUIPlugin.imageDescriptorFromPlugin(
						applicationID,imageName).createImage();
			imageMap.put(imageName,image);
		}
		return image;
	}
	public void dispose(){
		Iterator iterator = imageMap.values().iterator();
		while(iterator.hasNext()){
			((Image)iterator.next()).dispose();
		}
		imageMap.clear();
	}
}