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// Burton Computer Corporation
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package org.javimmutable.collections.serialization;

import org.javimmutable.collections.JImmutableStack;
import org.javimmutable.collections.list.JImmutableLinkedStack;

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 JImmutableStackProxy
    implements Externalizable
{
    private static final long serialVersionUID = -121805;
    private static final int STACK_VERSION = 1001;

    private JImmutableStack list;

    public JImmutableStackProxy()
    {
        this.list = JImmutableLinkedStack.of();
    }

    public JImmutableStackProxy(JImmutableLinkedStack list)
    {
        this.list = list;
    }

    @Override
    public void writeExternal(ObjectOutput out)
        throws IOException
    {
        out.writeInt(STACK_VERSION);
        JImmutableStack seq = list;
        while (!seq.isEmpty()) {
            out.writeBoolean(true);
            out.writeObject(seq.getHead());
            seq = seq.getTail();
        }
        out.writeBoolean(false);
    }

    @Override
    public void readExternal(ObjectInput in)
        throws IOException, ClassNotFoundException
    {
        final int version = in.readInt();
        if (version != STACK_VERSION) {
            throw new IOException("unexpected version number: expected " + STACK_VERSION + " found " + version);
        }
        JImmutableStack seq = this.list;
        while (in.readBoolean()) {
            seq = seq.insert(in.readObject());
        }
        for (Object obj : seq) {
            list = list.insert(obj);
        }
    }

    private Object readResolve()
    {
        return list;
    }
}