JAL-3130 adapted getdown src. attempt 2. first attempt failed due to cp'ed .git files

[jalview.git] / getdown / src / getdown / core / src / main / java / com / threerings / getdown / data / ClassPath.java

diff --git a/getdown/src/getdown/core/src/main/java/com/threerings/getdown/data/ClassPath.java b/getdown/src/getdown/core/src/main/java/com/threerings/getdown/data/ClassPath.java
new file mode 100644 (file)
index 0000000..9c2fce3
--- /dev/null
+++ b/getdown/src/getdown/core/src/main/java/com/threerings/getdown/data/ClassPath.java
@@ -0,0 +1,76 @@
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2018 Getdown authors
+// https://github.com/threerings/getdown/blob/master/LICENSE
+
+package com.threerings.getdown.data;
+
+import java.io.File;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.Collections;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+/**
+ * Represents the class path and it's elements of the application to be launched. The class path
+ * can either be represented as an {@link #asArgumentString() argument string} for the java command
+ * line or as an {@link #asUrls() array of URLs} to be used by a {@link URLClassLoader}.
+ */
+public class ClassPath
+{
+    public ClassPath (LinkedHashSet<File> classPathEntries)
+    {
+        _classPathEntries = Collections.unmodifiableSet(classPathEntries);
+    }
+
+    /**
+     * Returns the class path as an java command line argument string, e.g.
+     *
+     * <pre>
+     *   /path/to/a.jar:/path/to/b.jar
+     * </pre>
+     */
+    public String asArgumentString ()
+    {
+        StringBuilder builder = new StringBuilder();
+        String delimiter = "";
+        for (File entry: _classPathEntries) {
+            builder.append(delimiter).append(entry.getAbsolutePath());
+            delimiter = File.pathSeparator;
+        }
+        return builder.toString();
+    }
+
+    /**
+     * Returns the class path entries as an array of URLs to be used for example by an
+     * {@link URLClassLoader}.
+     */
+    public URL[] asUrls ()
+    {
+        URL[] urls = new URL[_classPathEntries.size()];
+        int i = 0;
+        for (File entry : _classPathEntries) {
+            urls[i++] = getURL(entry);
+        }
+        return urls;
+    }
+
+    public Set<File> getClassPathEntries ()
+    {
+        return _classPathEntries;
+    }
+
+
+    private static URL getURL (File file)
+    {
+        try {
+            return file.toURI().toURL();
+        } catch (MalformedURLException e) {
+            throw new IllegalStateException("URL of file is illegal: " + file.getAbsolutePath(), e);
+        }
+    }
+
+    private final Set<File> _classPathEntries;
+}