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1
51 package org.apache.fop.image.analyser;
52
53 import java.io.InputStream  ;
55 import java.io.BufferedInputStream ;
56 import java.io.IOException ;
57 import java.util.List ;
58
59 import org.apache.fop.image.FopImageException;
61
62
66 public class ImageReaderFactory {
67 protected static List formats = null;
68
69 static {
70
71 formats = new java.util.Vector ();
72 try {
73 registerImageReader("org.apache.fop.image.analyser.JPEGReader");
74 registerImageReader("org.apache.fop.image.analyser.BMPReader");
75 registerImageReader("org.apache.fop.image.analyser.GIFReader");
76 registerImageReader("org.apache.fop.image.analyser.PNGReader");
77 registerImageReader("org.apache.fop.image.analyser.TIFFReader");
78 registerImageReader("org.apache.fop.image.analyser.EPSReader");
79 registerImageReader("org.apache.fop.image.analyser.SVGReader");
80 } catch (ClassNotFoundException cnfe) {
81 throw new RuntimeException ("One of the default ImageReader implementations is not available: "+cnfe.getMessage());
82 }
83 }
84
85
91 public static void registerImageReader(String classname) throws ClassNotFoundException {
92 Class clazz = Class.forName(classname);
93 registerImageReader(clazz);
94 }
95
96
97
102 public static void registerImageReader(Class clazz) {
103 if (!ImageReader.class.isAssignableFrom(clazz)) throw new RuntimeException ("This class does not implement the ImageReader interface: "+clazz.getName());
104 formats.add(clazz);
105 }
106
107
116 public static ImageReader Make(String uri,
117 InputStream in) throws FopImageException {
118
119 ImageReader reader;
120 BufferedInputStream bis = new BufferedInputStream (in);
121 try {
122 for (int i = 0; i< formats.size(); i++) {
123 Class clazz = (Class )formats.get(i);
124 try {
125 reader = (ImageReader)clazz.newInstance();
126 } catch (Exception e) {
127 throw new FopImageException("ImageReader implementation cannot be instantiated: "+e.getMessage());
128 }
129 if (reader.verifySignature(uri, bis)) {
130 return reader;
131 }
132 }
133 } catch (IOException ex) {
134 throw new FopImageException(ex.getMessage());
135 }
136 return null;
137 }
138
139 }
140
141 |
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