summaryrefslogtreecommitdiffstats
path: root/src/java/com/jogamp/common/net/AssetURLConnection.java
diff options
context:
space:
mode:
Diffstat (limited to 'src/java/com/jogamp/common/net/AssetURLConnection.java')
-rw-r--r--src/java/com/jogamp/common/net/AssetURLConnection.java98
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;
+ }
+ }
+
+}