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// Burton Computer Corporation
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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;
    }
}