src/test/java/com/alibaba/com/caucho/hessian3/io/EnumDeserializer.java

/*
 * Copyright (c) 2001-2004 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Hessian", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Scott Ferguson
 */

package com.alibaba.com.caucho.hessian3.io;

import java.io.IOException;
import java.lang.reflect.Method;

/**
 * Deserializing an enum valued object
 */
public class EnumDeserializer extends AbstractDeserializer {
    private Class _enumType;
    private Method _valueOf;

    public EnumDeserializer(Class cl) {
        // hessian/33b[34], hessian/3bb[78]
        if (cl.isEnum())
            _enumType = cl;
        else if (cl.getSuperclass().isEnum())
            _enumType = cl.getSuperclass();
        else
            throw new RuntimeException("Class " + cl.getName() + " is not an enum");

        try {
            _valueOf = _enumType.getMethod("valueOf",
                    new Class[]{Class.class, String.class});
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public Class getType() {
        return _enumType;
    }

    @Override
    public Object readMap(AbstractHessianInput in)
            throws IOException {
        String name = null;

        while (!in.isEnd()) {
            String key = in.readString();

            if (key.equals("name"))
                name = in.readString();
            else
                in.readObject();
        }

        in.readMapEnd();

        Object obj = create(name);

        in.addRef(obj);

        return obj;
    }

    @Override
    public Object readObject(AbstractHessianInput in, String[] fieldNames)
            throws IOException {
        String name = null;

        for (int i = 0; i < fieldNames.length; i++) {
            if ("name".equals(fieldNames[i]))
                name = in.readString();
            else
                in.readObject();
        }

        Object obj = create(name);

        in.addRef(obj);

        return obj;
    }

    private Object create(String name)
            throws IOException {
        if (name == null)
            throw new IOException(_enumType.getName() + " expects name.");

        try {
            return _valueOf.invoke(null, _enumType, name);
        } catch (Exception e) {
            throw new IOExceptionWrapper(e);
        }
    }
}