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package com.jogamp.common.net;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
/**
* See base class {@link PiggybackURLConnection} for motivation.
*
* <p>
* <i>asset</i> resource location protocol connection.
* </p>
*
* <p>
* See {@link AssetURLContext#resolve(String)} how resources are being resolved.
* </p>
*
* <h3>Example:</h3>
*
* Assuming the plain <i>asset entry</i> <b><code>test/lala.txt</code></b> is being resolved by
* a class <code>test.LaLaTest</code>, ie. using the <i>asset aware</i> ClassLoader,
* one would use the following <i>asset</i> aware filesystem layout:
*
* <pre>
* test/LaLaTest.class
* assets/test/lala.txt
* </pre>
*
* The above maybe on a plain filesystem, or within a JAR or an APK file,
* e.g. <code>jogamp.test.apk</code>.
*
* The above would result in the following possible URLs
* reflecting the plain and resolved state of the <i>asset URL</i>:
* <pre>
* 0 Entry test/lala.txt
* 1 Plain asset:test/lala.txt
* 2 Resolved asset:jar:file:/data/app/jogamp.test.apk!/assets/test/lala.txt
* </pre>
*
* <p>
* The sub protocol URL of the resolved <i>asset</i>
* <pre>
* 3 Sub-URL jar:file:/data/app/jogamp.test.apk!/assets/test/lala.txt
* </pre>
* can be retrieved using {@link #getSubProtocol()}.
* </p>
*
* In all above cases, the <i>asset entry</i> is <b><code>test/lala.txt</code></b>,
* which can be retrieved via {@link #getEntryName()}.
*
* <p>
* <h3>General Implementation Notes:</h3>
* An <i>asset</i> URL is resolved using {@link AssetURLContext#getClassLoader()}.{@link ClassLoader#getResource(String) getResource(String)},
* hence the only requirement for an implementation is to have an <i>asset</i> aware ClassLoader
* as described in {@link AssetURLContext#getClassLoader()}.
* </p>
* <p>
* <h3>Warning:</h3>
* Since the <i>asset</i> protocol is currently not being implemented
* on all platform with an appropriate ClassLoader, a user shall not create the <i>asset</i> URL manually.<br>
* </p>
*
* <h3>Android Implementation Notes:</h3>
* <p>
* The Android ClassLoader {@link jogamp.android.launcher.AssetDexClassLoader}
* resolves the resource as an <i>asset</i> URL in it's {@link ClassLoader#findResource(String)} implementation.</p>
* <p>
* Currently we attach our <i>asset</i> {@link java.net.URLStreamHandlerFactory}
* to allow {@link java.net.URL} to handle <i>asset</i> URLs via our <i>asset</i> {@link java.net.URLStreamHandler} implementation.
* </p>
*/
public class AssetURLConnection extends PiggybackURLConnection<AssetURLContext> {
public AssetURLConnection(final URL url, final AssetURLContext implHelper) {
super(url, implHelper);
}
@Override
public String getEntryName() throws IOException {
if(!connected) {
throw new IOException("not connected");
}
final String urlPath ;
if(subConn instanceof JarURLConnection) {
urlPath = ((JarURLConnection)subConn).getEntryName();
} else {
urlPath = subConn.getURL().getPath();
}
if(urlPath.startsWith(AssetURLContext.assets_folder)) {
return urlPath.substring(AssetURLContext.assets_folder.length());
} else {
return urlPath;
}
}
}
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