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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.

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// Burton Computer Corporation
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// Copyright (c) 2017, Burton Computer Corporation
// All rights reserved.
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package org.javimmutable.collections.serialization;

import org.javimmutable.collections.JImmutableList;
import org.javimmutable.collections.JImmutableListMap;
import org.javimmutable.collections.JImmutableMap;

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

@SuppressWarnings("unchecked")
abstract class AbstractJImmutableListMapProxy
    implements Externalizable
{
    private static final int MAP_VERSION = 1001;
    private static final long serialVersionUID = -121805;

    protected JImmutableListMap map;

    protected AbstractJImmutableListMapProxy(JImmutableListMap map)
    {
        this.map = map;
    }

    @Override
    public void writeExternal(ObjectOutput out)
        throws IOException
    {
        out.writeInt(MAP_VERSION);
        writeMap(out);
        out.writeInt(map.size());
        final Iterator iterator = map.iterator();
        while (iterator.hasNext()) {
            final JImmutableMap.Entry entry = iterator.next();
            final JImmutableList list = (JImmutableList)entry.getValue();
            out.writeObject(entry.getKey());
            out.writeInt(list.size());
            for (Object value : list) {
                out.writeObject(value);
            }
        }
    }

    @Override
    public void readExternal(ObjectInput in)
        throws IOException, ClassNotFoundException
    {
        final int version = in.readInt();
        if (version != MAP_VERSION) {
            throw new IOException("unexpected version number: expected " + MAP_VERSION + " found " + version);
        }
        map = readMap(in);
        final int size = in.readInt();
        for (int i = 0; i < size; ++i) {
            final Object key = in.readObject();
            final int listSize = in.readInt();
            JImmutableList values = map.getList(key);
            for (int k = 0; k < listSize; ++k) {
                values = values.insertLast(in.readObject());
            }
            map = map.assign(key, values);
        }
    }

    protected Object readResolve()
    {
        return map;
    }

    protected JImmutableListMap readMap(ObjectInput in)
        throws IOException, ClassNotFoundException
    {
        return map;
    }

    protected void writeMap(ObjectOutput out)
        throws IOException
    {
    }
}