--- /dev/null
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
+package org.ibex;
+
+import java.io.*;
+import java.util.zip.*;
+import org.ibex.js.*;
+import org.ibex.util.*;
+import org.ibex.translators.MSPack;
+
+/**
+ * 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 //////////////////////////////////////////////////////////////////////////////
+
+ 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 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.HTTP(url).GET(); }
+ }
+
+ /** byte arrays */
+ public static class ByteArray extends Stream {
+ private byte[] bytes;
+ private String cacheKey;
+ 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;
+ 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;
+ 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 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;
+ 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 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;
+ 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 Scheduler.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 = 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