--- /dev/null
+// FIXEME
+// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
+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 Stream extends JS {
+
+ /** return a resource for a given url */
+ public static final Stream fromURL(String url) throws JSExn {
+ if (url.startsWith("http://")) return new Stream.HTTP(url);
+ else if (url.startsWith("https://")) return new Stream.HTTP(url);
+ else if (url.startsWith("data:")) return new Stream.ByteArray(Base64.decode(url.substring(5)), null);
+ else if (url.startsWith("utf8:")) return new Stream.ByteArray(url.substring(5).getBytes(), null);
+ throw new JSExn("invalid resource specifier " + url);
+ }
+
+ // Base Class //////////////////////////////////////////////////////////////////////
+
+ public String typeName() { return "resource"; }
+
+ /** so that we get the same subresource each time */
+ private Hash refCache = null;
+
+ public Template t = null;
+
+ public final InputStream getInputStream() throws IOException { return getInputStream(""); }
+ public abstract InputStream getInputStream(String path) throws IOException;
+
+ public Stream addExtension(String extension) { return new Ref(this, extension); }
+
+ public Object get(Object key) throws JSExn {
+ if ("".equals(key)) {
+ try {
+ Template t = Template.getTemplate(addExtension(".xwt"));
+ return t == null ? null : t.getStatic(null); /** FIXME VERY BAD! */
+ } catch (Exception e) {
+ Log.info(this, e);
+ return null;
+ }
+ }
+ 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;
+ }
+
+
+
+ // 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; }
+
+ /** subclass from this if you want a CachedInputStream for each path */
+ public static class CachedStream extends Stream {
+ private Stream parent;
+ private boolean disk = false;
+ private String key;
+ public String getCacheKey() throws NotCacheableException { return key; }
+ public String toString() { return key; }
+ private Hash cachedInputStreams = new Hash();
+ public CachedStream(Stream 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) {
+ if (disk) {
+ java.io.File f = LocalStorage.Cache.getCacheFileForKey(key);
+ if (f.exists()) return new FileInputStream(f);
+ cis = new CachedInputStream(parent.getInputStream(path), f);
+ } else {
+ cis = new CachedInputStream(parent.getInputStream(path));
+ }
+ cachedInputStreams.put(path, cis);
+ }
+ return cis.getInputStream();
+ }
+ }
+
+
+ // Useful Subclasses //////////////////////////////////////////////////////////////////////
+
+ /** HTTP or HTTPS resource */
+ public static class HTTP extends Stream {
+ private String url;
+ HTTP(String url) { while (url.endsWith("/")) url = url.substring(0, url.length() - 1); this.url = url; }
+ public String toString() { return 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 Stream {
+ private byte[] bytes;
+ private String cacheKey = null;
+ ByteArray(byte[] bytes, String cacheKey) { this.bytes = bytes; this.cacheKey = cacheKey; }
+ public String toString() { return "byte[]"; }
+ public String getCacheKey() throws NotCacheableException { return cacheKey; }
+ public InputStream getInputStream(String path) throws IOException {
+ if (!"".equals(path)) throw new IOException("can't get subresources of a byte[] resource");
+ return new ByteArrayInputStream(bytes);
+ }
+ }
+
+ /** a file */
+ public static class File extends Stream {
+ 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 toString() { return "file:" + 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 Stream {
+ private Stream parent;
+ Zip(Stream parent) { this.parent = parent; }
+ public String toString() { return parent.toString() + "!zip"; }
+ 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 IOException("requested file (" + path + ") not found in archive");
+ return new KnownLength.KnownLengthInputStream(zis, (int)ze.getSize());
+ }
+ }
+
+ /** "unwrap" a Cab archive */
+ public static class Cab extends Stream {
+ private Stream parent;
+ Cab(Stream parent) { this.parent = parent; }
+ public String toString() { return parent.toString() + "!cab"; }
+ 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 Stream {
+ public Builtin() { };
+ public String getCacheKey() throws NotCacheableException { throw notCacheable; } // not cacheable
+ public String toString() { return "builtin:"; }
+ 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 Stream {
+ Stream parent;
+ Object key;
+ public String toString() { return parent.toString() + "/" + key; }
+ Ref(Stream parent, Object key) { this.parent = parent; this.key = key; }
+ public String getCacheKey() throws NotCacheableException { return parent.getCacheKey() + "/" + key; }
+ public Stream 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); }
+ }
+
+ /** provides redirection of a specified key */
+ public static class Graft extends Stream {
+ Stream graftee;
+ Object replaced_key, replaced_val;
+ Graft(Stream graftee, Object key, Object val) { this.graftee = graftee; this.replaced_key = key; this.replaced_val = val; }
+ public boolean equals(Object o) { return this == o || graftee.equals(o); }
+ public int hashCode() { return graftee.hashCode(); }
+ public InputStream getInputStream(String s) throws IOException { return graftee.getInputStream(s); }
+ public Object get(Object key) throws JSExn { return replaced_key.equals(key) ? replaced_val : graftee.get(key); }
+ public Object callMethod(Object name, Object a, Object b, Object c, Object[] rest, int nargs) throws JSExn {
+ if (replaced_key.equals(name)) {
+ if (replaced_val instanceof JS) return ((JS)replaced_val).call(a, b, c, rest, nargs);
+ else throw new JSExn("attempted to call non-function (class="+replaced_val.getClass()+")");
+ } else {
+ return graftee.callMethod(name, a, b, c, rest, nargs);
+ }
+ }
+ public Number coerceToNumber() { return graftee.coerceToNumber(); }
+ public String coerceToString() { return graftee.coerceToString(); }
+ public boolean coerceToBoolean() { return graftee.coerceToBoolean(); }
+ public String typeName() { return graftee.typeName(); }
+ }
+
+ /** shadow resource which replaces the graft */
+ public static class ProgressWatcher extends Stream {
+ final Stream watchee;
+ JSFunction callback;
+ ProgressWatcher(Stream watchee, JSFunction callback) { this.watchee = watchee; this.callback = callback; }
+ public String toString() { return watchee.toString(); }
+ 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() throws Exception {
+ callback.call(N(bytesDownloaded),
+ N(is instanceof KnownLength ? ((KnownLength)is).getLength() : 0), null, null, 2);
+ } });
+ return ret;
+ }
+ };
+ }
+ }
+}
projects / org.ibex.core.git / blobdiff