/*
 * Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.openflowjava.protocol.impl.deserialization;

import java.util.HashMap;
import java.util.Map;

import org.opendaylight.openflowjava.protocol.api.extensibility.DeserializerRegistry;
import org.opendaylight.openflowjava.protocol.api.extensibility.DeserializerRegistryInjector;
import org.opendaylight.openflowjava.protocol.api.extensibility.MessageCodeKey;
import org.opendaylight.openflowjava.protocol.api.extensibility.OFGeneralDeserializer;
import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
import org.opendaylight.openflowjava.protocol.impl.util.MatchDeserializer;
import org.opendaylight.openflowjava.protocol.impl.util.OF10MatchDeserializer;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.match.grouping.Match;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.oxm.rev130731.match.v10.grouping.MatchV10;

/**
 * Stores and registers deserializers
 * @author michal.polkorab
 */
public class DeserializerRegistryImpl implements DeserializerRegistry {
    
    private Map<MessageCodeKey, OFGeneralDeserializer> registry;

    /**
     * Decoder table provisioning
     */
    @Override
    public void init() {
        registry = new HashMap<>();
        // register message deserializers
        MessageDerializerInitializer.registerMessageDeserializers(this);

        // register common structure deserializers
        registerDeserializer(new MessageCodeKey(EncodeConstants.OF10_VERSION_ID,
                EncodeConstants.EMPTY_VALUE, MatchV10.class), new OF10MatchDeserializer());
        registerDeserializer(new MessageCodeKey(EncodeConstants.OF13_VERSION_ID,
                EncodeConstants.EMPTY_VALUE, Match.class), new MatchDeserializer());

        // register match entry deserializers
        MatchEntryDeserializerInitializer.registerMatchEntryDeserializers(this);
        // register action deserializers
        ActionDeserializerInitializer.registerDeserializers(this);
        // register instruction deserializers
        InstructionDeserializerInitializer.registerDeserializers(this);
        // register default experimenter deserializers
        DefaultExperimenterDeserializerInitializer.registerDeserializers(this);
    }

    @Override
    @SuppressWarnings("unchecked")
    public <DESERIALIZER_TYPE extends OFGeneralDeserializer> DESERIALIZER_TYPE getDeserializer(
            MessageCodeKey key) {
        OFGeneralDeserializer deserializer = registry.get(key);
        if (deserializer == null) {
            throw new NullPointerException("Deserializer for key: " + key.toString()
                    + " was not found");
        }
        return (DESERIALIZER_TYPE) deserializer;
    }

    @Override
    public void registerDeserializer(MessageCodeKey key,
            OFGeneralDeserializer deserializer) {
        if ((key == null) || (deserializer == null)) {
            throw new NullPointerException("MessageCodeKey or Deserializer is null");
        }
        if (deserializer instanceof DeserializerRegistryInjector) {
            ((DeserializerRegistryInjector) deserializer).injectDeserializerRegistry(this);
        }
        registry.put(key, deserializer);
    }

    @Override
    public boolean unregisterDeserializer(MessageCodeKey key) {
        if (key == null) {
            throw new NullPointerException("MessageCodeKey is null");
        }
        OFGeneralDeserializer deserializer = registry.remove(key);
        if (deserializer == null) {
            return false;
        }
        return true;
    }

}