--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/org/tn5250j/encoding/BuiltInCodePageFactory.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,156 @@
+/**
+ * $Id$
+ *
+ * Title: tn5250J
+ * Copyright:   Copyright (c) 2001,2012
+ * Company:
+ * @author: master_jaf
+ *
+ * Description:
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
+ *
+ */
+package org.tn5250j.encoding;
+
+import java.lang.reflect.Constructor;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+
+import org.tn5250j.encoding.builtin.CCSID1025;
+import org.tn5250j.encoding.builtin.CCSID1026;
+import org.tn5250j.encoding.builtin.CCSID1112;
+import org.tn5250j.encoding.builtin.CCSID1140;
+import org.tn5250j.encoding.builtin.CCSID1141;
+import org.tn5250j.encoding.builtin.CCSID1147;
+import org.tn5250j.encoding.builtin.CCSID1148;
+import org.tn5250j.encoding.builtin.CCSID273;
+import org.tn5250j.encoding.builtin.CCSID277;
+import org.tn5250j.encoding.builtin.CCSID278;
+import org.tn5250j.encoding.builtin.CCSID280;
+import org.tn5250j.encoding.builtin.CCSID284;
+import org.tn5250j.encoding.builtin.CCSID285;
+import org.tn5250j.encoding.builtin.CCSID297;
+import org.tn5250j.encoding.builtin.CCSID37;
+import org.tn5250j.encoding.builtin.CCSID424;
+import org.tn5250j.encoding.builtin.CCSID500;
+import org.tn5250j.encoding.builtin.CCSID870;
+import org.tn5250j.encoding.builtin.CCSID871;
+import org.tn5250j.encoding.builtin.CCSID875;
+import org.tn5250j.encoding.builtin.ICodepageConverter;
+import android.util.Log;
+
+
+/**
+ * Methods for built-in code page support.
+ */
+class BuiltInCodePageFactory {
+    private static final String TAG = "BuiltInCodePageFactory";
+    private static BuiltInCodePageFactory singleton;
+
+    private final List<Class<?>> clazzes = new ArrayList<Class<?>>();
+
+
+    private BuiltInCodePageFactory() {
+        register();
+    }
+
+    public static synchronized final BuiltInCodePageFactory getInstance() {
+        if (singleton == null) {
+            singleton = new BuiltInCodePageFactory();
+        }
+
+        return singleton;
+    }
+
+    private void register() {
+        clazzes.add(CCSID37.class);
+        clazzes.add(CCSID273.class);
+        clazzes.add(CCSID277.class);
+        clazzes.add(CCSID278.class);
+        clazzes.add(CCSID280.class);
+        clazzes.add(CCSID284.class);
+        clazzes.add(CCSID285.class);
+        clazzes.add(CCSID297.class);
+        clazzes.add(CCSID424.class);
+        clazzes.add(CCSID500.class);
+        clazzes.add(CCSID870.class);
+        clazzes.add(CCSID871.class);
+        clazzes.add(CCSID875.class);
+        clazzes.add(CCSID1025.class);
+        clazzes.add(CCSID1026.class);
+        clazzes.add(CCSID1112.class);
+        clazzes.add(CCSID1140.class);
+        clazzes.add(CCSID1141.class);
+        clazzes.add(CCSID1147.class);
+        clazzes.add(CCSID1148.class);
+    }
+
+    /**
+     * @return unsorted list of available code pages
+     */
+    public String[] getAvailableCodePages() {
+        HashSet<String> cpset = new HashSet<String>();
+
+        for (Class<?> clazz : clazzes) {
+            final ICodepageConverter converter = getConverterFromClassName(clazz);
+
+            if (converter != null) {
+                cpset.add(converter.getName());
+            }
+        }
+
+        return cpset.toArray(new String[cpset.size()]);
+    }
+
+    /**
+     * @param encoding
+     * @return an {@link ICodePage} object OR null, of not found
+     */
+    public ICodePage getCodePage(String encoding) {
+        for (Class<?> clazz : clazzes) {
+            final ICodepageConverter converter = getConverterFromClassName(clazz);
+
+            if (converter != null && converter.getName().equals(encoding)) {
+                return converter;
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Lazy loading converters takes time,
+     * but doesn't happen so often and saves memory.
+     *
+     * @param clazz {@link ICodepageConverter}
+     * @return
+     */
+    private ICodepageConverter getConverterFromClassName(Class<?> clazz) {
+        try {
+            final Constructor<?> constructor = clazz.getConstructor(new Class[0]);
+            final ICodepageConverter converter = (ICodepageConverter) constructor.newInstance();
+            converter.init();
+            return converter;
+        }
+        catch (Exception e) {
+            Log.e(TAG, "Couldn't load code page converter class:" + clazz.getCanonicalName(), e);
+            return null;
+        }
+    }
+
+}