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Diffstat (limited to 'src/java/com/jogamp/common/net/AssetURLConnection.java')
-rw-r--r-- | src/java/com/jogamp/common/net/AssetURLConnection.java | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/java/com/jogamp/common/net/AssetURLConnection.java b/src/java/com/jogamp/common/net/AssetURLConnection.java new file mode 100644 index 0000000..f2a5a01 --- /dev/null +++ b/src/java/com/jogamp/common/net/AssetURLConnection.java @@ -0,0 +1,98 @@ +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(URL url, 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; + } + } + +} |