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/***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
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 * Copyright (C) 2002 Jan Arne Petersen 
 * Copyright (C) 2002-2004 Anders Bengtsson 
 * Copyright (C) 2004 Stefan Matthias Aust 
 * Copyright (C) 2007 Ola Bini 
 * 
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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package org.jruby.runtime.marshal;

import java.io.IOException;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;

import org.jruby.RubySymbol;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.ByteList;

public class MarshalCache {
    private final Map linkCache = new IdentityHashMap();
    private final Map symbolCache = new HashMap();

    public boolean isRegistered(IRubyObject value) {
        assert !(value instanceof RubySymbol) : "Use isSymbolRegistered for symbol links";

        return linkCache.containsKey(value);
    }

    public boolean isSymbolRegistered(ByteList sym) {
        return symbolCache.containsKey(sym);
    }

    public void register(IRubyObject value) {
        assert !(value instanceof RubySymbol) : "Use registeredSymbolIndex for symbols";

        linkCache.put(value, Integer.valueOf(linkCache.size()));
    }

    public void registerSymbol(ByteList sym) {
        symbolCache.put(sym, symbolCache.size());
    }

    public void writeLink(MarshalStream output, IRubyObject value) throws IOException {
        assert !(value instanceof RubySymbol) : "Use writeSymbolLink for symbols";

        output.write('@');
        output.writeInt(registeredIndex(value));
    }

    public void writeSymbolLink(MarshalStream output, ByteList sym) throws IOException {
        output.write(';');
        output.writeInt(registeredSymbolIndex(sym));
    }

    private int registeredIndex(IRubyObject value) {
        return linkCache.get(value).intValue();
    }

    private int registeredSymbolIndex(ByteList sym) {
        return symbolCache.get(sym);
    }
}