-// FIXEME
-// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
package org.xwt;
import java.io.*;
import java.util.zip.*;
import org.xwt.js.*;
import org.xwt.util.*;
+import org.xwt.translators.MSPack;
import org.bouncycastle.util.encoders.Base64;
+/**
+ * Essentiall an InputStream "factory". You can repeatedly ask a
+ * Stream for an InputStream, and each InputStream you get back will
+ * be totally independent of the others (ie separate stream position
+ * and state) although they draw from the same data source.
+ */
+public abstract class Stream extends JS.Cloneable {
-/** 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 Interface //////////////////////////////////////////////////////////////////////////////
+ public static InputStream getInputStream(Object js) throws IOException { return ((Stream)((JS)js).unclone()).getInputStream();}
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();
- }
- }
+ // streams are "sealed" by default to prevent accidental object leakage
+ public void put(Object key, Object val) throws JSExn { }
+ public Object get(Object key) throws JSExn { return null; }
+ // Private Interface //////////////////////////////////////////////////////////////////////////////
- // Useful Subclasses //////////////////////////////////////////////////////////////////////
+ protected abstract InputStream getInputStream() throws IOException;
+ protected String getCacheKey() throws NotCacheableException { throw new NotCacheableException(); }
/** HTTP or HTTPS resource */
public static class HTTP extends Stream {
private String url;
+ public String toString() { return "Stream.HTTP:" + 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(); }
+ public Object get(Object key) throws JSExn { return new HTTP(url + "/" + (String)key); }
+ public String getCacheKey(Vec path) throws NotCacheableException { return url; }
+ public InputStream getInputStream() throws IOException { return new org.xwt.HTTP(url).GET(); }
}
/** byte arrays */
public static class ByteArray extends Stream {
private byte[] bytes;
- private String cacheKey = null;
+ private String cacheKey;
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);
- }
+ public String getCacheKey() throws NotCacheableException {
+ if (cacheKey == null) throw new NotCacheableException(); return cacheKey; }
+ public InputStream getInputStream() throws IOException { 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;
- }
+ File(String path) { 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)); }
+ public String getCacheKey() throws NotCacheableException { throw new NotCacheableException(); /* already on disk */ }
+ public InputStream getInputStream() throws IOException { return new FileInputStream(path); }
+ public Object get(Object key) throws JSExn { return new File(path + java.io.File.separatorChar + (String)key); }
}
/** "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"; }
+ private String path;
+ Zip(Stream parent) { this(parent, null); }
+ Zip(Stream parent, String path) {
+ while(path != null && path.startsWith("/")) path = path.substring(1);
+ this.parent = parent;
+ this.path = path;
+ }
public String getCacheKey() throws NotCacheableException { return parent.getCacheKey() + "!zip:"; }
- public InputStream getInputStream(String path) throws IOException {
- if (path.startsWith("/")) path = path.substring(1);
+ public Object get(Object key) throws JSExn { return new Zip(parent, path==null?(String)key:path+'/'+(String)key); }
+ public InputStream getInputStream() throws IOException {
InputStream pis = parent.getInputStream();
ZipInputStream zis = new ZipInputStream(pis);
ZipEntry ze = zis.getNextEntry();
/** "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"; }
+ private String path;
+ Cab(Stream parent) { this(parent, null); }
+ Cab(Stream parent, String path) { this.parent = parent; this.path = path; }
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);
- }
+ public Object get(Object key) throws JSExn { return new Cab(parent, path==null?(String)key:path+'/'+(String)key); }
+ public InputStream getInputStream() throws IOException { return new 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(); }
+ public String getCacheKey() throws NotCacheableException { throw new NotCacheableException(); }
+ public InputStream getInputStream() throws IOException { return Platform.getBuiltinInputStream(); }
}
/** 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(); }
+ JS callback;
+ ProgressWatcher(Stream watchee, JS 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);
+ public InputStream getInputStream() throws IOException {
+ final InputStream is = watchee.getInputStream();
return new FilterInputStream(is) {
int bytesDownloaded = 0;
public int read() throws IOException {
};
}
}
+
+ /** 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; }
+ CachedInputStream cis = null;
+ public CachedStream(Stream p, String s, boolean d) throws NotCacheableException {
+ this.parent = p; this.disk = d; this.key = p.getCacheKey();
+ }
+ public InputStream getInputStream() throws IOException {
+ if (cis != null) return cis.getInputStream();
+ if (!disk) {
+ cis = new CachedInputStream(parent.getInputStream());
+ } else {
+ java.io.File f = LocalStorage.Cache.getCacheFileForKey(key);
+ if (f.exists()) return new FileInputStream(f);
+ cis = new CachedInputStream(parent.getInputStream(), f);
+ }
+ return cis.getInputStream();
+ }
+ }
}
projects / org.ibex.core.git / blobdiff