001 package railo.runtime.img.coder; 002 003 import java.awt.image.BufferedImage; 004 import java.io.IOException; 005 006 import railo.commons.io.res.Resource; 007 import railo.commons.lang.SystemOut; 008 public abstract class Coder { 009 010 private static Coder instance; 011 012 protected Coder(){} 013 014 public static Coder getInstance(){ 015 016 if(instance==null){ 017 instance = new JRECoder(); 018 019 // try to load Sanselan, does not load when lib not exists 020 try{ 021 SanselanCoder sanselan = new SanselanCoder(); 022 instance=new DoubleCoder(sanselan, instance); 023 SystemOut.printDate("use Sanselan and JRE Image Coder "); 024 } 025 catch(Throwable t){ 026 SystemOut.printDate("use JRE Image Coder "); 027 } 028 } 029 return instance; 030 } 031 032 033 /** 034 * translate a file resource to a buffered image 035 * @param res 036 * @return 037 * @throws IOException 038 */ 039 public abstract BufferedImage toBufferedImage(Resource res,String format) throws IOException; 040 041 /** 042 * translate a binary array to a buffered image 043 * @param binary 044 * @return 045 * @throws IOException 046 */ 047 public abstract BufferedImage toBufferedImage(byte[] bytes,String format) throws IOException; 048 049 public abstract String[] getWriterFormatNames(); 050 051 public abstract String[] getReaderFormatNames(); 052 053 }