X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Fibex%2Fjs%2FFountain.java;fp=src%2Forg%2Fibex%2Fjs%2FFountain.java;h=264f2ff0b8464be5de9c00dc82887642c7349c12;hb=a9010e65b3e6bcd993faf55ce8f05d73c20ddff0;hp=0000000000000000000000000000000000000000;hpb=0eb84e095ebf3b7f91317ef8d643f684924ab8b5;p=org.ibex.js.git diff --git a/src/org/ibex/js/Fountain.java b/src/org/ibex/js/Fountain.java new file mode 100644 index 0000000..264f2ff --- /dev/null +++ b/src/org/ibex/js/Fountain.java @@ -0,0 +1,164 @@ +// 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.net.*; + +/** + * Essentiall an InputStream "factory". You can repeatedly ask a + * Fountain 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 Fountain extends JS.Cloneable { + + // Public Interface ////////////////////////////////////////////////////////////////////////////// + + public static InputStream getInputStream(Object js) throws IOException { return ((Fountain)((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 Fountain { + 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(null, null); } + } + + /** byte arrays */ + public static class ByteArray extends Fountain { + 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 Fountain { + 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 Fountain { + private Fountain parent; + private String path; + public Zip(Fountain parent) { this(parent, null); } + public Zip(Fountain 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 */ + /* temporarily disabled due to dependency issues + public static class Cab extends Fountain { + private Fountain parent; + private String path; + public Cab(Fountain parent) { this(parent, null); } + public Cab(Fountain 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 */ + /* temporarily disabled due to dependency issues + public static class Builtin extends Fountain { + public String getCacheKey() throws NotCacheableException { throw new NotCacheableException(); } + public InputStream getInputStream() throws IOException { return Platform.getBuiltinInputStream(); } + } + */ + + /** shadow resource which replaces the graft */ + /* temporarily disabled due to dependency issues + public static class ProgressWatcher extends Fountain { + final Fountain watchee; + JS callback; + public ProgressWatcher(Fountain 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 */ + /* temporarily disabled due to dependency issues + public static class CachedStream extends Fountain { + private Fountain parent; + private boolean disk = false; + private String key; + public String getCacheKey() throws NotCacheableException { return key; } + CachedInputStream cis = null; + public CachedStream(Fountain 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(); + } + } + */ +}