src/main/java/com/alibaba/com/caucho/hessian/io/ArrayDeserializer.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.hessian.io;

import java.io.IOException;
import java.lang.reflect.Array;
import java.util.ArrayList;

/**
 * Deserializing a Java array
 */
public class ArrayDeserializer extends AbstractListDeserializer {
    private Class _componentType;
    private Class _type;

    public ArrayDeserializer(Class componentType) {
        _componentType = componentType;

        if (_componentType != null) {
            try {
                _type = Array.newInstance(_componentType, 0).getClass();
            } catch (Exception e) {
            }
        }

        if (_type == null)
            _type = Object[].class;
    }

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

    /**
     * Reads the array.
     */
    @Override
    public Object readList(AbstractHessianInput in, int length)
            throws IOException {
        if (length >= 0) {
            Object[] data = createArray(length);

            in.addRef(data);

            if (_componentType != null) {
                for (int i = 0; i < data.length; i++)
                    data[i] = in.readObject(_componentType);
            } else {
                for (int i = 0; i < data.length; i++)
                    data[i] = in.readObject();
            }

            in.readListEnd();

            return data;
        } else {
            ArrayList list = new ArrayList();

            in.addRef(list);

            if (_componentType != null) {
                while (!in.isEnd())
                    list.add(in.readObject(_componentType));
            } else {
                while (!in.isEnd())
                    list.add(in.readObject());
            }

            in.readListEnd();

            Object[] data = createArray(list.size());
            for (int i = 0; i < data.length; i++)
                data[i] = list.get(i);

            return data;
        }
    }

    /**
     * Reads the array.
     */
    @Override
    public Object readLengthList(AbstractHessianInput in, int length)
            throws IOException {
        Object[] data = createArray(length);

        in.addRef(data);

        if (_componentType != null) {
            for (int i = 0; i < data.length; i++)
                data[i] = in.readObject(_componentType);
        } else {
            for (int i = 0; i < data.length; i++)
                data[i] = in.readObject();
        }

        return data;
    }

    protected Object[] createArray(int length) {
        if (_componentType != null)
            return (Object[]) Array.newInstance(_componentType, length);
        else
            return new Object[length];
    }

    @Override
    public String toString() {
        return "ArrayDeserializer[" + _componentType + "]";
    }
}