Behold, Nenya, Ring of Water and repository for our media and animation related
goodies, both Java 2D and LWJGL/JME 3D. git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@1 ed5b42cb-e716-0410-a449-f6a68f950b19
This commit is contained in:
Michael Bayne
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//
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// $Id: Handler.java 3749 2005-11-09 04:00:16Z mdb $
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//
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// Narya library - tools for developing networked games
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// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
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// http://www.threerings.net/code/narya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.resource;
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import java.awt.Rectangle;
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import java.awt.image.BufferedImage;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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import java.net.URLConnection;
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import java.net.URLStreamHandler;
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import java.security.Permission;
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import javax.imageio.ImageIO;
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import javax.imageio.stream.ImageInputStream;
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import com.samskivert.io.ByteArrayOutInputStream;
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import com.samskivert.net.AttachableURLFactory;
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import com.samskivert.util.StringUtil;
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import com.threerings.geom.GeomUtil;
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/**
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* This class is not used directly, except by a registering ResourceManager
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* so that we can load data from the resource manager using URLs of the form
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* <code>resource://<resourceSet>/<path></code>. ResourceSet may
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* be the empty string to load from the default resource sets.
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*/
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public class Handler extends URLStreamHandler
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{
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/**
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* Register this class to handle "resource" urls
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* ("resource://<i>resourceSet</i>/<i>path</i>") with the specified
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* ResourceManager.
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*/
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public static void registerHandler (ResourceManager rmgr)
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{
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// if we already have a resource manager registered; don't
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// register another one
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if (_rmgr != null) {
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Log.warning("Refusing duplicate resource handler registration.");
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return;
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}
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_rmgr = rmgr;
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// wire up our handler with the handy dandy attachable URL factory
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AttachableURLFactory.attachHandler("resource", Handler.class);
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}
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// documentation inherited
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protected int hashCode (URL url)
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{
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return String.valueOf(url).hashCode();
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}
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// documentation inherited
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protected boolean equals (URL u1, URL u2)
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{
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return String.valueOf(u1).equals(String.valueOf(u2));
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}
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// documentation inherited
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protected URLConnection openConnection (URL url)
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throws IOException
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{
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return new URLConnection(url) {
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// documentation inherited
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public void connect ()
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throws IOException
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{
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// the host is the bundle name
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String bundle = this.url.getHost();
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// and we need to remove the leading '/' from path;
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String path = this.url.getPath().substring(1);
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try {
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// if there are query parameters, we need special magic
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String query = url.getQuery();
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if (!StringUtil.isBlank(query)) {
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_stream = getStream(bundle, path, query);
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} else if (StringUtil.isBlank(bundle)) {
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_stream = _rmgr.getResource(path);
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} else {
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_stream = _rmgr.getResource(bundle, path);
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}
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this.connected = true;
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} catch (IOException ioe) {
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Log.warning("Could not find resource [url=" + this.url +
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", error=" + ioe.getMessage() + "].");
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throw ioe; // rethrow
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}
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}
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// documentation inherited
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public InputStream getInputStream ()
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throws IOException
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{
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if (!this.connected) {
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connect();
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}
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return _stream;
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}
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// documentation inherited
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public Permission getPermission ()
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throws IOException
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{
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// We allow anything in the resource bundle to be loaded
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// without any permission restrictions.
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return null;
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}
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protected InputStream _stream;
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};
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}
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/**
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* Does some magic to allow a subset of an image to be extracted,
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* reencoded as a PNG and then spat back out to the Java content
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* handler system for inclusion in internal documentation.
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*/
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protected InputStream getStream (String bundle, String path, String query)
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throws IOException
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{
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// we can only do this with PNGs
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if (!path.endsWith(".png")) {
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Log.warning("Requested sub-tile of non-PNG resource " +
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"[bundle=" + bundle + ", path=" + path +
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", dims=" + query + "].");
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return _rmgr.getResource(bundle, path);
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}
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// parse the query string
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String[] bits = StringUtil.split(query, "&");
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int width = -1, height = -1, tidx = -1;
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try {
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for (int ii = 0; ii < bits.length; ii++) {
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if (bits[ii].startsWith("width=")) {
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width = Integer.parseInt(bits[ii].substring(6));
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} else if (bits[ii].startsWith("height=")) {
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height = Integer.parseInt(bits[ii].substring(7));
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} else if (bits[ii].startsWith("tile=")) {
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tidx = Integer.parseInt(bits[ii].substring(5));
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}
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}
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} catch (NumberFormatException nfe) {
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}
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if (width <= 0 || height <= 0 || tidx < 0) {
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Log.warning("Bogus sub-image dimensions [bundle=" + bundle +
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", path=" + path + ", dims=" + query + "].");
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throw new FileNotFoundException(path);
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}
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// locate the tile image, then write that subimage back out in PNG
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// format into memory and return an input stream for that
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ImageInputStream stream =
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StringUtil.isBlank(bundle) ? _rmgr.getImageResource(path)
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: _rmgr.getImageResource(bundle, path);
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BufferedImage src = ImageIO.read(stream);
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Rectangle trect = GeomUtil.getTile(
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src.getWidth(), src.getHeight(), width, height, tidx);
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BufferedImage tile = src.getSubimage(
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trect.x, trect.y, trect.width, trect.height);
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ByteArrayOutInputStream data = new ByteArrayOutInputStream();
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ImageIO.write(tile, "PNG", data);
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return data.getInputStream();
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}
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/** Our singleton resource manager. */
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protected static ResourceManager _rmgr;
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}
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