org.javimmutable.collections.serialization.JImmutableArrayProxy Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of javimmutable-collections Show documentation

Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

There is a newer version: 3.2.1

Show newest version

///###////////////////////////////////////////////////////////////////////////
//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2018, Burton Computer Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//
//     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.
//
//     Neither the name of the Burton Computer Corporation nor the names
//     of its contributors may be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS 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 THE COPYRIGHT
// HOLDER OR 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.

package org.javimmutable.collections.serialization;

import org.javimmutable.collections.JImmutableArray;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.array.JImmutableTrieArray;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

/**
 * Serialization proxy class to safely serialize immutable collection.
 */
@SuppressWarnings("unchecked")
public class JImmutableArrayProxy
    implements Externalizable
{
    private static final long serialVersionUID = -121805;
    private static final int LIST_VERSION = 1001;

    private JImmutableArray list;

    public JImmutableArrayProxy()
    {
        this.list = JImmutableTrieArray.of();
    }

    public JImmutableArrayProxy(JImmutableTrieArray list)
    {
        this.list = list;
    }

    @Override
    public void writeExternal(ObjectOutput out)
        throws IOException
    {
        out.writeInt(LIST_VERSION);
        out.writeInt(list.size());
        for (JImmutableMap.Entry entry : (Iterable)list) {
            out.writeInt((Integer)entry.getKey());
            out.writeObject(entry.getValue());
        }
    }

    @Override
    public void readExternal(ObjectInput in)
        throws IOException, ClassNotFoundException
    {
        final int version = in.readInt();
        if (version != LIST_VERSION) {
            throw new IOException("unexpected version number: expected " + LIST_VERSION + " found " + version);
        }
        final int size = in.readInt();
        for (int i = 0; i < size; ++i) {
            final int index = in.readInt();
            final Object value = in.readObject();
            list = list.assign(index, value);
        }
    }

    private Object readResolve()
    {
        return list;
    }
}