--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tn5250j/encoding/BuiltInCodePageFactory.java	Thu May 22 12:38:09 2014 -0700
@@ -0,0 +1,149 @@
+/**
+ * $Id$
+ *
+ * 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 org.tn5250j.tools.logging.TN5250jLogFactory;
+import org.tn5250j.tools.logging.TN5250jLogger;
+
+/**
+ * Methods for built-in code page support.
+ */
+/* package */ class BuiltInCodePageFactory {
+
+	private static BuiltInCodePageFactory singleton;
+
+	private final List<Class<?>> clazzes = new ArrayList<Class<?>>();
+	private final TN5250jLogger log = TN5250jLogFactory.getLogger(this.getClass());
+
+	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.error("Couldn't load code page converter class:" + clazz.getCanonicalName(), e);
+			return null;
+		}
+	}
+
+}