001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.messaging.jmf.codec.std.impl;
023
024import java.io.IOException;
025
026import org.granite.messaging.jmf.CodecRegistry;
027import org.granite.messaging.jmf.DumpContext;
028import org.granite.messaging.jmf.InputContext;
029import org.granite.messaging.jmf.OutputContext;
030import org.granite.messaging.jmf.codec.std.EnumCodec;
031import org.granite.messaging.jmf.codec.std.impl.util.ClassNameUtil;
032import org.granite.messaging.jmf.codec.std.impl.util.IntegerUtil;
033
034/**
035 * @author Franck WOLFF
036 */
037public class EnumCodecImpl extends AbstractStandardCodec<Object> implements EnumCodec {
038
039        protected static final int ORDINAL_BYTE_COUNT_OFFSET = 6;
040
041        public int getObjectType() {
042                return JMF_ENUM;
043        }
044
045        public boolean canEncode(Object v) {
046                return v.getClass().isEnum();
047        }
048
049        public void encode(OutputContext ctx, Object v) throws IOException {
050                String className = ctx.getAlias(v.getClass().getName());
051                int ordinal = ((Enum<?>)v).ordinal();
052                int count = IntegerUtil.significantIntegerBytesCount0(ordinal);
053                
054                ctx.getOutputStream().write((count << ORDINAL_BYTE_COUNT_OFFSET) | JMF_ENUM);
055                IntegerUtil.encodeInteger(ctx, ordinal, count);
056                ClassNameUtil.encodeClassName(ctx, className);
057        }
058
059        public Object decode(InputContext ctx, int parameterizedJmfType) throws IOException, ClassNotFoundException {
060                int count = (parameterizedJmfType >>> ORDINAL_BYTE_COUNT_OFFSET) /* & 0x03 */;
061                int ordinal = IntegerUtil.decodeInteger(ctx, count);
062                String className = ctx.getAlias(ClassNameUtil.decodeClassName(ctx));
063                Class<?> cls = ctx.getSharedContext().getReflection().loadClass(className);
064
065                return cls.getEnumConstants()[ordinal];
066        }
067
068        public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
069                final CodecRegistry codecRegistry = ctx.getSharedContext().getCodecRegistry();
070                
071                int jmfType = codecRegistry.extractJmfType(parameterizedJmfType);
072                
073                if (jmfType != JMF_ENUM)
074                        throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
075
076                int count = (parameterizedJmfType >>> ORDINAL_BYTE_COUNT_OFFSET) /* & 0x03 */;
077                int ordinal = IntegerUtil.decodeInteger(ctx, count);
078                String className = ctx.getAlias(ClassNameUtil.decodeClassName(ctx));
079                
080                ctx.indentPrintLn(className + ": <" + ordinal + ">");
081        }
082}