1 // Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
6 import java.util.zip.*;
9 import org.bouncycastle.util.encoders.Base64;
11 /** base class for XWT resources */
12 public abstract class Res extends JS {
14 public String getDescriptiveName() { return ""; }
16 /** cache of subresources so that the equality operator works on them */
17 private Hash refCache = null;
19 public Template t = null;
21 public Res getParent() { return null; }
23 /** returns an InputStream containing the Resource's contents */
24 public InputStream getInputStream() throws IOException { return getInputStream(""); }
25 public abstract InputStream getInputStream(String path) throws IOException;
27 /** graft newResource in place of this resource on its parent */
28 public Res graft(Object newResource) { throw new JS.Exn("cannot graft onto this resource"); }
30 /** if the path of this resource does not end with extension, return a new one wit it appended */
31 public Res addExtension(String extension) { return new Ref(this, extension); }
33 public Object[] keys() { throw new JS.Exn("cannot enumerate a resource"); }
34 public void put(Object key, Object val) { throw new JS.Exn("cannot put to a resource"); }
35 public Object get(Object key) {
37 Template t = Template.getTemplate(addExtension(".xwt"));
38 return t == null ? null : t.getStatic();
40 Object ret = refCache == null ? null : refCache.get(key);
41 if (ret != null) return ret;
42 ret = new Ref(this, key);
43 if (refCache == null) refCache = new Hash();
44 refCache.put(key, ret);
48 public static Res stringToRes(String url) { return stringToRes(url, false); }
49 public static Res stringToRes(String url, boolean permitLocalFilesystem) {
50 if (url.indexOf('!') != -1)
51 return (Res)(new Zip(stringToRes(url.substring(0, url.lastIndexOf('!')))).
52 get(url.substring(url.lastIndexOf('!') + 1)));
53 if (url.startsWith("http://")) return new HTTP(url);
54 if (url.startsWith("https://")) return new HTTP(url);
55 if (url.startsWith("file:") && permitLocalFilesystem) return new File(url.substring(5));
56 if (url.startsWith("cab:")) return new CAB(stringToRes(url.substring(4)));
57 if (url.startsWith("data:")) return new ByteArray(Base64.decode(url.substring(5)));
58 if (url.startsWith("utf8:")) return new ByteArray(url.substring(5).getBytes());
59 throw new JS.Exn("invalid resource specifier " + url);
62 /** subclass from this if you want a CachedInputStream for each path */
63 public static abstract class CachedRes extends Res {
64 private Hash cachedInputStreams = new Hash();
65 abstract InputStream _getInputStream(String path) throws IOException;
66 public final InputStream getInputStream(String path) throws IOException {
67 CachedInputStream cis = (CachedInputStream)cachedInputStreams.get(path);
69 cis = new CachedInputStream(_getInputStream(path));
70 cachedInputStreams.put(path, cis);
72 return cis.getInputStream();
76 /** HTTP or HTTPS resource */
77 public static class HTTP extends CachedRes {
79 HTTP(String url) { this.url = url; }
80 public InputStream _getInputStream(String path) throws IOException {
81 return new org.xwt.HTTP(url + path).GET(); }
85 public static class ByteArray extends Res {
87 ByteArray(byte[] bytes) { this.bytes = bytes; }
88 public InputStream getInputStream(String path) throws IOException {
89 if (!"".equals(path)) throw new JS.Exn("can't get subresources of a byte[] resource");
90 return new ByteArrayInputStream(bytes);
95 public static class File extends Res {
97 File(String path) { this.path = path; }
98 public InputStream getInputStream(String rest) throws IOException {
99 return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
102 /** wrap a Res around a preexisting InputStream */
103 public static class IS extends Res {
105 IS(InputStream parent) { this.parent = parent; }
106 public InputStream getInputStream(String path) {
107 if (!"".equals(path)) throw new JS.Exn("can't access subresources of IS");
112 /** "unwrap" a Zip archive */
113 public static class Zip extends Res {
115 Zip(Res parent) { this.parent = parent; }
116 public InputStream getInputStream(String path) throws IOException {
117 if (path.startsWith("/")) path = path.substring(1);
118 ZipInputStream zis = new ZipInputStream(parent.getInputStream());
119 ZipEntry ze = zis.getNextEntry();
120 while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
121 if (ze == null) throw new JS.Exn("requested file not found in archive");
126 /** what you get when you reference a subresource */
127 public static class Ref extends Res {
130 Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
131 public String getDescriptiveName() {
132 String pdn = parent.getDescriptiveName();
133 return pdn.equals("") ? key.toString() : (pdn + "." + key.toString());
135 public Res addExtension(String extension) {
136 return (key instanceof String && ((String)key).endsWith(extension)) ? this : new Ref(parent, key + extension);
138 public InputStream getInputStream(String path) throws IOException {
139 return parent.getInputStream("/" + key + path);
141 public Res getParent() { return parent; }
142 public Res graft(Object newResource) { return new Graft(parent, key, newResource); }
145 /** shadow resource which replaces the graft */
146 public static class Graft extends Res {
150 Graft(Res graftee, Object key, Object val) { this.graftee = graftee; replaced_key = key; replaced_val = val; }
151 public boolean equals(Object o) { return (this == o || graftee.equals(o)); }
152 public int hashCode() { return graftee.hashCode(); }
153 public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
154 public Object get(Object key) { return replaced_key.equals(key) ? replaced_val : graftee.get(key); }
155 public String getDescriptiveName() { return graftee.getDescriptiveName(); }
156 public Res getParent() { return graftee.getParent(); }
159 /** shadow resource which replaces the graft */
160 public static class ProgressWatcher extends Res {
162 JS.Callable callback;
163 ProgressWatcher(Res watchee, JS.Callable callback) { this.watchee = watchee; this.callback = callback; }
164 public InputStream getInputStream(String s) throws IOException {
165 return new FilterInputStream(watchee.getInputStream(s)) {
166 int bytesDownloaded = 0;
167 public int read() throws IOException {
168 int ret = super.read();
169 if (ret != -1) bytesDownloaded++;
172 public int read(byte[] b, int off, int len) throws IOException {
173 int ret = super.read(b, off, len);
174 if (ret != 1) bytesDownloaded += ret;
175 ThreadMessage.newthread(new JS.Callable() { public Object call(JS.Array a) {
176 JS.Array args = new JS.Array();
177 args.addElement(new Integer(bytesDownloaded));
187 /** unpacks a Microsoft CAB file (possibly embedded in another file; we scan for 'MSCF' */
188 public static class CAB extends Res {
190 CAB(Res parent) { this.parent = parent; }
191 private int swap_endian(int i) {
192 return ((i & 0xff) << 24) | ((i & 0xff00) << 8) | ((i & 0xff0000) >>> 8) | (i >>> 24);
194 public InputStream getInputStream(String path) throws IOException {
196 return org.xwt.util.CAB.getFileInputStream(parent.getInputStream(), 2, path);
197 } catch (EOFException eof) {
198 throw new JS.Exn("MSCF header tag not found in file");
199 } catch (IOException ioe) {
200 throw new JS.Exn("IOException while reading file");
205 public Object callMethod(Object method, Array args, boolean checkOnly) throws JS.Exn {
206 if (method.equals("getUTF")) {
207 if (checkOnly) return Boolean.TRUE;
208 if (args.length() != 0) return null;
210 CharArrayWriter caw = new CharArrayWriter();
211 InputStream is = getInputStream();
212 BufferedReader r = new BufferedReader(new InputStreamReader(is));
213 char[] buf = new char[1024];
215 int numread = r.read(buf, 0, 1024);
216 if (numread == -1) break;
217 caw.write(buf, 0, numread);
219 return caw.toString();
220 } catch (IOException e) {
221 if (Log.on) Log.log(Res.class, "IO Exception while reading from file");
222 if (Log.on) Log.log(Res.class, e);
223 throw new JS.Exn("error while reading from Resource");
225 } else if (method.equals("getDOM")) {
226 if (checkOnly) return Boolean.TRUE;
227 if (args.length() != 0) return null;
228 return new XMLHelper().doParse();
230 if (checkOnly) return Boolean.FALSE;
234 private class XMLHelper extends XML {
235 Vector obStack = new Vector();
236 public XMLHelper() { super(BUFFER_SIZE); }
237 public void startElement(XML.Element c) throws XML.SchemaException {
239 o.put("$name", c.localName);
240 for(int i=0; i<c.len; i++) o.put(c.keys[i], c.vals[i]);
241 o.put("$numchildren", new Integer(0));
242 obStack.addElement(o);
244 public void endElement(XML.Element c) throws XML.SchemaException {
245 if (obStack.size() == 1) return;
246 JS me = (JS)obStack.lastElement();
247 obStack.setSize(obStack.size() - 1);
248 JS parent = (JS)obStack.lastElement();
249 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
250 parent.put("$numchildren", new Integer(numchildren + 1));
251 parent.put(new Integer(numchildren), me);
253 public void characters(char[] ch, int start, int length) throws XML.SchemaException {
254 String s = new String(ch, start, length);
255 JS parent = (JS)obStack.lastElement();
256 int numchildren = ((Integer)parent.get("$numchildren")).intValue();
257 Object lastChild = parent.get(new Integer(numchildren - 1));
258 if (lastChild instanceof String) {
259 parent.put(new Integer(numchildren - 1), lastChild + s);
261 parent.put("$numchildren", new Integer(numchildren + 1));
262 parent.put(new Integer(numchildren), s);
265 public void whitespace(char[] ch, int start, int length) {}
266 public JS doParse() throws JS.Exn {
268 InputStream is = getInputStream();
269 BufferedReader r = new BufferedReader(new InputStreamReader(is));
271 } catch (XML.XMLException e) {
272 throw new JS.Exn("error parsing XML: " + e.toString());
273 } catch (IOException e) {
274 if (Log.on) Log.log(this, "IO Exception while reading from file");
275 if (Log.on) Log.log(this, e);
276 throw new JS.Exn("error reading from Resource");
278 return obStack.size() >= 1 ? (JS)obStack.elementAt(0) : null;
282 public void writeTo(OutputStream os) throws IOException {
283 InputStream is = getInputStream();
284 byte[] buf = new byte[1024];
286 int numread = is.read(buf, 0, 1024);
287 if (numread == -1) break;
288 if (Log.on) Log.log(this, "wrote " + numread + " bytes");
289 os.write(buf, 0, numread);
293 // we have to close this because flush() doesn't work on Win32-GCJ