examplefilefilter.java

rtp发送端

package	RTPTransmit;
import java.io.File;
import java.util.Hashtable;
import java.util.Enumeration;
import javax.swing.filechooser.*;
public class ExampleFileFilter extends	FileFilter
{
	private	Hashtable filers = null;
	private String	description = null;
	private String	fullDescription = null;	
	
	public ExampleFileFilter()
	{
		this.filers = new Hashtable();	
	}
	
	public void addExtention(String extention)
	{
		if (filers == null)
		{
			filers = new Hashtable();	
		}
		
		filers.put(extention.toLowerCase(),this);
		
		fullDescription = null;
	}
	
	public void setDescription(String	description)
	{
		this.description = 	description;
		fullDescription = null;		
	}
	
	
	public String getExtention(File f)
	{
		if(f != null)
		{
			String filename = f.getName();
			int i = filename.lastIndexOf('.');
			if(i > 0 && i <filename.length()-1)
			{
				return 	filename.substring(i+1).toLowerCase();
			}	
		}
			
		return null;			
	}
	
	
	public boolean accept(File f)
	{
		if(f != null)
		{
			if(f.isDirectory())
			{
				return true;
			}
			
			String extention = getExtention(f);
			if(extention != null&& filers.get(getExtention(f)) != null)
			{
				return true;
			}	
		}
		
		return false;
	}
	
	public String getDescription()
	{
		if(fullDescription == null)
		{
			fullDescription = (fullDescription == null)?"(":(description+"(");
			Enumeration extentions = filters.keys();
			
			if(extentions != null)
			{
				fullDescription += "," + (String)extentions.nextElement();
				
				while(extentions.hasMoreElement())
				{
					fullDescription += ", *." + (String)extentions.nextElement();	
				}	
			}
			
			fullDescription += ")";						
		}
		
		return fullDescription;			
	}	
}