/*
 * Copyright 2010 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package java.lang;

import java.io.DataInputStream;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.util.HashMap;
import java.util.zip.InflaterInputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;

class CharacterName1 {

    private static SoftReference<HashMap<Integer, String>> refNames;

    private static HashMap<Integer, String> getNames() {
        HashMap<Integer, String> names = null;
        if (refNames != null && (names = refNames.get()) != null)
            return names;
        synchronized(CharacterName1.class) {
            if (refNames != null && (names = refNames.get()) != null)
                return names;
            DataInputStream dis = null;
            try {
                dis = new DataInputStream(new InflaterInputStream(
                    AccessController.doPrivileged(new PrivilegedAction<InputStream>()
                    {
                        public InputStream run() {
                            return getClass().getResourceAsStream("uniName.dat");
                        }
                    })));
                byte[] str = new byte[dis.readInt()]; // string part length
                dis.readFully(str);
                String allNames = new String(str, 0, str.length, "ASCII");
                str = null; // help GC
                names = new HashMap<>(dis.readInt()); // numbers part length
                dis.mark(1);
                for (int len, i=0, cp=0; (len = dis.read()) >= 0; dis.mark(1)) {
                    if (len < 0x80) // allows maximum character name length of 127
                        cp++;
                    else {
                        len &= 0x7F; // allows maximum character name length of 127
                        dis.reset();
                        cp = dis.readInt() & 0xFFFFFF;
                    }
                    names.put(cp, allNames.substring(i, i += len));
                }
	    } catch (Exception e) {
                e.printStackTrace();
	    } finally {
                try {
                    dis.close();
                } catch (Exception ee) {
                    ee.printStackTrace();
	        }
                return (refNames = new SoftReference<>(names)).get();
            }
        }
    }

    public static String get(int cp) {
        return getNames().get(cp);
    }
}