moved Stream.java into js

darcs-hash:20040714071255-5007d-06bcca4fb5e8a35f1df504f87cb69c7368c0494b.gz

diff --git a/src/org/ibex/js/Stream.java b/src/org/ibex/js/Stream.java
new file mode 100644 (file)
index 0000000..6c9a806
--- /dev/null
+++ b/src/org/ibex/js/Stream.java
@@ -0,0 +1,158 @@
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
+package org.ibex.js;
+
+import java.io.*;
+import java.util.zip.*;
+import org.ibex.util.*;
+import org.ibex.plat.*;
+import org.ibex.net.*;
+import org.ibex.core.*;
+
+/**
+ *   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 {
+
+    // Public Interface //////////////////////////////////////////////////////////////////////////////
+
+    public static InputStream getInputStream(Object js) throws IOException { return ((Stream)((JS)js).unclone()).getInputStream();}
+    public static class NotCacheableException extends Exception { }
+
+    // streams are "sealed" by default to prevent accidental object leakage
+    public void put(Object key, Object val) { }
+    private Cache getCache = new Cache(100);
+    protected Object _get(Object key) { return null; }
+    public final Object get(Object key) {
+        Object ret = getCache.get(key);
+        if (ret == null) getCache.put(key, ret = _get(key));
+        return ret;
+    }
+
+    // Private Interface //////////////////////////////////////////////////////////////////////////////
+
+    public 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; }
+        public HTTP(String url) { while (url.endsWith("/")) url = url.substring(0, url.length() - 1); this.url = url; }
+        public Object _get(Object key) { return new HTTP(url + "/" + (String)key); }
+        public String getCacheKey(Vec path) throws NotCacheableException { return url; }
+        public InputStream getInputStream() throws IOException { return new org.ibex.net.HTTP(url).GET(); }
+    }
+
+    /** byte arrays */
+    public static class ByteArray extends Stream {
+        private byte[] bytes;
+        private String cacheKey;
+        public ByteArray(byte[] bytes, String cacheKey) { this.bytes = bytes; this.cacheKey = cacheKey; }
+        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;
+        public File(String path) { this.path = path; }
+        public String toString() { return "file:" + path; }
+        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) { return new File(path + java.io.File.separatorChar + (String)key); }
+    }
+
+    /** "unwrap" a Zip archive */
+    public static class Zip extends Stream {
+        private Stream parent;
+        private String path;
+        public Zip(Stream parent) { this(parent, null); }
+        public 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 Object _get(Object key) { 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();
+            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;
+        private String path;
+        public Cab(Stream parent) { this(parent, null); }
+        public Cab(Stream parent, String path) { this.parent = parent; this.path = path; }
+        public String getCacheKey() throws NotCacheableException { return parent.getCacheKey() + "!cab:"; }
+        public Object _get(Object key) { 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 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;
+        JS callback;
+        public ProgressWatcher(Stream watchee, JS callback) { this.watchee = watchee; this.callback = callback; }
+        public String getCacheKey() throws NotCacheableException { return watchee.getCacheKey(); }
+        public InputStream getInputStream() throws IOException {
+            final InputStream is = watchee.getInputStream();
+            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 Task() { public void perform() throws IOException, JSExn {
+                            callback.call(N(bytesDownloaded),
+                                          N(is instanceof KnownLength ? ((KnownLength)is).getLength() : 0), null, null, 2);
+                        } });
+                        return ret;
+                    }
+                };
+        }
+    }
+
+    /** 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 = org.ibex.core.LocalStorage.Cache.getCacheFileForKey(key);
+                if (f.exists()) return new FileInputStream(f);
+                cis = new CachedInputStream(parent.getInputStream(), f);
+            }
+            return cis.getInputStream();
+        }
+    }
+}