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.amf.io.util.instantiator;
023
024import java.util.ArrayList;
025import java.util.Collections;
026import java.util.List;
027
028import org.granite.messaging.service.ServiceException;
029import org.granite.util.TypeUtil;
030
031/**
032 * @author Igor SAZHNEV
033 */
034public 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}