package org.xwt;
import java.io.*;
+import java.util.*;
+import java.util.zip.*;
+import org.xwt.js.*;
+import org.xwt.util.*;
+import org.bouncycastle.util.encoders.Base64;
-/** base class for XWT resources */
-public abstract class Res {
- public abstract InputStream getInputStream();
- public Res getSubResource(String key) { return Null.singleton; }
+/** Base class for XWT resources */
+public abstract class Res extends JS {
- public static Res stringToRes(String url) {
- if (url.indexOf('!') == -1)
- return new Zip(stringToRes(url.substring(0, url.lastIndexOf('!'))),
- url.substring(url.lastIndexOf('!') + 1));
- if (url.startsWith("http://")) return new HTTP(url);
- if (url.startsWith("https://")) return new HTTP(url);
- throw new JS.Exn("invalid resource specifier");
+ // Base Class //////////////////////////////////////////////////////////////////////
+
+ public String typeName() { return "resource"; }
+
+ /** so that we get the same subresource each time */
+ private Hash refCache = null;
+
+ /** FIXME: needed? good idea? */
+ public Template t = null;
+
+ public final InputStream getInputStream() throws IOException { return getInputStream(""); }
+ public abstract InputStream getInputStream(String path) throws IOException;
+
+ public Res addExtension(String extension) { return new Ref(this, extension); }
+
+ public Object get(Object key) {
+ if ("".equals(key)) {
+ Template t = Template.getTemplate(addExtension(".xwt"));
+ return t == null ? null : t.getStatic();
+ }
+ Object ret = refCache == null ? null : refCache.get(key);
+ if (ret != null) return ret;
+ ret = new Ref(this, key);
+ if (refCache == null) refCache = new Hash();
+ refCache.put(key, ret);
+ return ret;
}
- /** the invalid resource; only causes an error if you actually try to use it */
- public static class Null extends Res {
- Null() { }
- private static singleton = new Null();
- public InputStream getInputStream() throws JS.Exn { throw new JS.Exn("invalid resource"); }
+
+
+ // Caching //////////////////////////////////////////////////////////////////////
+
+ public static class NotCacheableException extends Exception { }
+ public static NotCacheableException notCacheable = new NotCacheableException();
+
+ /** if it makes sense to cache a resource, the resource must return a unique key */
+ public String getCacheKey() throws NotCacheableException { throw notCacheable; }
+
+ // FIXME: general cleanup
+ /** subclass from this if you want a CachedInputStream for each path */
+ public static class CachedRes extends Res {
+ private Res parent;
+ private boolean disk = false;
+ private String key;
+ public String getCacheKey() throws NotCacheableException { return key; }
+ private Hash cachedInputStreams = new Hash();
+ public CachedRes(Res p, String s, boolean d) throws NotCacheableException {
+ this.parent = p; this.disk = d; this.key = p.getCacheKey();
+ }
+ public InputStream getInputStream(String path) throws IOException {
+ CachedInputStream cis = (CachedInputStream)cachedInputStreams.get(path);
+ if (cis == null) {
+ java.io.File f = null;
+ if (disk) {
+ f = new java.io.File(System.getProperty("user.home") +
+ java.io.File.separatorChar + ".xwt" +
+ java.io.File.separatorChar + "caches" +
+ java.io.File.separatorChar +
+ new String(Base64.encode(key.getBytes())));
+ Log.log(this, "caching resource in " + f);
+ new java.io.File(f.getParent()).mkdirs();
+ if (f.exists()) return new FileInputStream(f);
+ }
+ cis = new CachedInputStream(parent.getInputStream(path), f);
+ cachedInputStreams.put(path, cis);
+ }
+ return cis.getInputStream();
+ }
}
+
+ // Useful Subclasses //////////////////////////////////////////////////////////////////////
+
/** HTTP or HTTPS resource */
public static class HTTP extends Res {
private String url;
- HTTP(String url) { this.url = url; }
- public InputStream getInputStream() { return new HTTP(url).GET(); }
- public Res getSubResource(String key) { return new HTTP(url + "/" + key); }
+ HTTP(String url) { while (url.endsWith("/")) url = url.substring(0, url.length() - 1); this.url = url; }
+ public String getCacheKey() throws NotCacheableException { return url; }
+ public InputStream getInputStream(String path) throws IOException { return new org.xwt.HTTP(url + path).GET(); }
+ }
+
+ /** byte arrays */
+ public static class ByteArray extends Res {
+ private byte[] bytes;
+ private String cacheKey = null;
+ ByteArray(byte[] bytes, String cacheKey) { this.bytes = bytes; this.cacheKey = cacheKey; }
+ public String getCacheKey() throws NotCacheableException { return cacheKey; }
+ public InputStream getInputStream(String path) throws IOException {
+ if (!"".equals(path)) throw new JS.Exn("can't get subresources of a byte[] resource");
+ return new ByteArrayInputStream(bytes);
+ }
}
- /** wrap a Res around a preexisting InputStream */
- public static class IS extends Res {
- InputStream parent;
- IS(InputStream parent) { this.parent = parent; }
- public InputStream getInputStream() { return parent; }
+ /** a file */
+ public static class File extends Res {
+ private String path;
+ File(String path) {
+ while (path.endsWith(java.io.File.separatorChar + "")) path = path.substring(0, path.length() - 1);
+ this.path = path;
+ }
+ public String getCacheKey() throws NotCacheableException { throw notCacheable; } // already on the disk!
+ public InputStream getInputStream(String rest) throws IOException {
+ return new FileInputStream((path + rest).replace('/', java.io.File.separatorChar)); }
}
/** "unwrap" a Zip archive */
public static class Zip extends Res {
private Res parent;
- private String path = "";
- Zip(Res parent, String path) { this.parent = parent; this.path = path; }
- public InputStream getInputStream() {
- ZipInputStream zis = new ZipInputStream(parent.getInputStream());
+ Zip(Res parent) { this.parent = parent; }
+ public String getCacheKey() throws NotCacheableException { return parent.getCacheKey() + "!zip:"; }
+ public InputStream getInputStream(String path) throws IOException {
+ if (path.startsWith("/")) path = path.substring(1);
+ InputStream pis = parent.getInputStream();
+ ZipInputStream zis = new ZipInputStream(pis);
ZipEntry ze = zis.getNextEntry();
while(ze != null && !ze.getName().equals(path)) ze = zis.getNextEntry();
- if (ze == null) throw new JS.Exn("zip file not found in archive");
- return zis;
+ if (ze == null) throw new JS.Exn("requested file (" + path + ") not found in archive");
+ return new KnownLength.KnownLengthInputStream(zis, (int)ze.getSize());
}
- public Res getSubResource(String key) { return new Zip(parent, path + '/' + key); }
}
+ /** "unwrap" a Cab archive */
+ public static class Cab extends Res {
+ private Res parent;
+ Cab(Res parent) { this.parent = parent; }
+ public String getCacheKey() throws NotCacheableException { return parent.getCacheKey() + "!cab:"; }
+ public InputStream getInputStream(String path) throws IOException {
+ if (path.startsWith("/")) path = path.substring(1);
+ return new org.xwt.translators.MSPack(parent.getInputStream()).getInputStream(path);
+ }
+ }
+
+ /** the Builtin resource */
+ public static class Builtin extends Res {
+ public Builtin() { };
+ public String getCacheKey() throws NotCacheableException { throw notCacheable; } // not cacheable
+ public InputStream getInputStream(String path) throws IOException {
+ if (!path.equals("")) throw new IOException("the builtin resource has no subresources");
+ return Platform.getBuiltinInputStream();
+ }
+ }
+
+ /** what you get when you reference a subresource */
+ public static class Ref extends Res {
+ Res parent;
+ Object key;
+ public String toString() { return parent.toString() + "/" + key; }
+ Ref(Res parent, Object key) { this.parent = parent; this.key = key; }
+ public String getCacheKey() throws NotCacheableException { return parent.getCacheKey() + "/" + key; }
+ public Res addExtension(String extension) {
+ return ((String)key).endsWith(extension) ? this : new Ref(parent, key + extension); }
+ public InputStream getInputStream(String path) throws IOException { return parent.getInputStream("/" + key + path); }
+ }
+
+ /** shadow resource which replaces the graft */
+ public static class ProgressWatcher extends Res {
+ final Res watchee;
+ JSFunction callback;
+ ProgressWatcher(Res watchee, JSFunction callback) { this.watchee = watchee; this.callback = callback; }
+ public String getCacheKey() throws NotCacheableException { return watchee.getCacheKey(); }
+ public InputStream getInputStream(String s) throws IOException {
+ final InputStream is = watchee.getInputStream(s);
+ return new FilterInputStream(is) {
+ int bytesDownloaded = 0;
+ public int read() throws IOException {
+ int ret = super.read();
+ if (ret != -1) bytesDownloaded++;
+ return ret;
+ }
+ public int read(byte[] b, int off, int len) throws IOException {
+ int ret = super.read(b, off, len);
+ if (ret != 1) bytesDownloaded += ret;
+ Scheduler.add(new Scheduler.Task() { public void perform() {
+ JSArray args = new JSArray();
+ args.addElement(new Integer(bytesDownloaded));
+ args.addElement(new Integer(is instanceof KnownLength ? ((KnownLength)is).getLength() : 0));
+ callback.call(args);
+ } });
+ return ret;
+ }
+ };
+ }
+ }
}
projects / org.ibex.core.git / blobdiff