Merge branch 'Jalview-JS/develop' into develop

[jalview.git] / unused / xml / sax / helpers / NewInstance.java

diff --git a/unused/xml/sax/helpers/NewInstance.java b/unused/xml/sax/helpers/NewInstance.java
new file mode 100644 (file)
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+++ b/unused/xml/sax/helpers/NewInstance.java
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+// NewInstance.java - create a new instance of a class by name.
+// http://www.saxproject.org
+// Written by Edwin Goei, edwingo@apache.org
+// and by David Brownell, dbrownell@users.sourceforge.net
+// NO WARRANTY!  This class is in the Public Domain.
+// $Id: NewInstance.java,v 1.4 2002/01/30 20:52:27 dbrownell Exp $
+
+package org.xml.sax.helpers;
+
+import java.lang.reflect.Method;
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Create a new instance of a class by name.
+ *
+ * <blockquote>
+ * <em>This module, both source code and documentation, is in the
+ * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
+ * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
+ * for further information.
+ * </blockquote>
+ *
+ * <p>This class contains a static method for creating an instance of a
+ * class from an explicit class name.  It tries to use the thread's context
+ * ClassLoader if possible and falls back to using
+ * Class.forName(String).</p>
+ *
+ * <p>This code is designed to compile and run on JDK version 1.1 and later
+ * including versions of Java 2.</p>
+ *
+ * @author Edwin Goei, David Brownell
+ * @version 2.0.1 (sax2r2)
+ */
+class NewInstance {
+
+    /**
+     * Creates a new instance of the specified class name
+     *
+     * Package private so this code is not exposed at the API level.
+     */
+    static Object newInstance (ClassLoader classLoader, String className)
+        throws ClassNotFoundException, IllegalAccessException,
+            InstantiationException
+    {
+        Class driverClass;
+        if (classLoader == null) {
+            driverClass = Class.forName(className);
+        } else {
+            driverClass = classLoader.loadClass(className);
+        }
+        return driverClass.newInstance();
+    }
+
+    /**
+     * Figure out which ClassLoader to use.  For JDK 1.2 and later use
+     * the context ClassLoader.
+     */           
+    static ClassLoader getClassLoader ()
+    {
+        Method m = null;
+
+        try {
+            m = Thread.class.getMethod("getContextClassLoader", null);
+        } catch (NoSuchMethodException e) {
+            // Assume that we are running JDK 1.1, use the current ClassLoader
+            return NewInstance.class.getClassLoader();
+        }
+
+        try {
+            return (ClassLoader) m.invoke(Thread.currentThread(), null);
+        } catch (IllegalAccessException e) {
+            // assert(false)
+            throw new UnknownError(e.getMessage());
+        } catch (InvocationTargetException e) {
+            // assert(e.getTargetException() instanceof SecurityException)
+            throw new UnknownError(e.getMessage());
+        }
+    }
+}