/*
 * 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 "Burlap", "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.hessian.io;

import java.io.IOException;

/**
 * Deserializing an object.
 */
abstract public class AbstractDeserializer implements Deserializer {
    @Override
    public Class getType() {
        return Object.class;
    }

    @Override
    public Object readObject(AbstractHessianInput in)
            throws IOException {
        Object obj = in.readObject();

        String className = getClass().getName();

        if (obj != null)
            throw error(className + ": unexpected object " + obj.getClass().getName());
        else
            throw error(className + ": unexpected null value");
    }

    @Override
    public Object readList(AbstractHessianInput in, int length)
            throws IOException {
        throw new UnsupportedOperationException(String.valueOf(this));
    }

    @Override
    public Object readList(AbstractHessianInput in, int length, Class<?> expectType) throws IOException {
        if (expectType == null) {
            return readList(in, length);
        }
        throw new UnsupportedOperationException(String.valueOf(this));
    }

    @Override
    public Object readLengthList(AbstractHessianInput in, int length)
            throws IOException {
        throw new UnsupportedOperationException(String.valueOf(this));
    }

    @Override
    public Object readLengthList(AbstractHessianInput in, int length, Class<?> expectType) throws IOException {
        if (expectType == null) {
            return readLengthList(in, length);
        }
        throw new UnsupportedOperationException(String.valueOf(this));
    }

    @Override
    public Object readMap(AbstractHessianInput in)
            throws IOException {
        Object obj = in.readObject();

        String className = getClass().getName();

        if (obj != null)
            throw error(className + ": unexpected object " + obj.getClass().getName());
        else
            throw error(className + ": unexpected null value");
    }

    @Override
    public Object readMap(AbstractHessianInput in, Class<?> expectKeyType, Class<?> expectValueType) throws IOException {
        if (expectKeyType == null && expectValueType == null) {
            return readMap(in);
        }
        throw new UnsupportedOperationException(String.valueOf(this));
    }

    @Override
    public Object readObject(AbstractHessianInput in, String[] fieldNames)
            throws IOException {
        throw new UnsupportedOperationException(String.valueOf(this));
    }

    protected HessianProtocolException error(String msg) {
        return new HessianProtocolException(msg);
    }

    protected String codeName(int ch) {
        if (ch < 0)
            return "end of file";
        else
            return "0x" + Integer.toHexString(ch & 0xff);
    }

    protected SerializerFactory findSerializerFactory(AbstractHessianInput in) {
        SerializerFactory serializerFactory = null;
        if (in instanceof Hessian2Input) {
            serializerFactory = ((Hessian2Input) in).findSerializerFactory();
        } else if (in instanceof HessianInput) {
            serializerFactory = ((HessianInput) in).getSerializerFactory();
        }
        return serializerFactory == null ? new SerializerFactory() : serializerFactory;
    }
}