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     */
022    package org.granite.messaging.amf.io.util.instantiator;
023    
024    import java.util.ArrayList;
025    import java.util.Collections;
026    import java.util.List;
027    
028    import org.granite.messaging.service.ServiceException;
029    import org.granite.util.TypeUtil;
030    
031    /**
032     * @author Igor SAZHNEV
033     */
034    public class EnumInstantiator extends AbstractInstantiator<Enum<?>> {
035    
036        private static final long serialVersionUID = -6116814787518316453L;
037    
038        private final String type;
039    
040        private static final List<String> orderedFields;
041        static {
042            List<String> of = new ArrayList<String>(1);
043            of.add("value");
044            orderedFields = Collections.unmodifiableList(of);
045        }
046    
047        public EnumInstantiator(String type) {
048            this.type = type;
049        }
050    
051        @Override
052        public List<String> getOrderedFieldNames() {
053            return orderedFields;
054        }
055    
056        @SuppressWarnings({ "unchecked", "rawtypes" })
057        @Override
058        public Enum<?> newInstance() {
059            Enum<?> enumInstance = null;
060    
061            String enumValue = null;
062            try {
063                Class<? extends Enum> enumClass = (Class<? extends Enum>)TypeUtil.forName(type);
064                enumValue = (String)get("value");
065                if (enumValue == null) {
066                    Object[] enumConstants = enumClass.getEnumConstants();
067                    if (enumConstants == null || enumConstants.length == 0)
068                        throw new ServiceException("Invalid Enum type: " + type);
069                    enumValue = ((Enum<?>)enumConstants[0]).name();
070                }
071                enumInstance = Enum.valueOf(enumClass, enumValue);
072            } catch (ClassNotFoundException e) {
073                throw new ServiceException("Could not find Enum type for: " + type, e);
074            } catch (IllegalArgumentException e) {
075                throw new ServiceException("Could not find Enum constant for: " + type + '.' + enumValue, e);
076            }
077    
078            return enumInstance;
079        }
080    }