/*
 * Copyright (c) 2014 Cisco Systems, Inc. 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.controller.cluster.datastore.messages;

import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.CheckedFuture;
import com.google.common.util.concurrent.SettableFuture;
import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadTransaction;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;

public class ReadData extends AbstractRead<Optional<NormalizedNode<?, ?>>> {
    private static final long serialVersionUID = 1L;

    public ReadData() {
    }

    public ReadData(final YangInstanceIdentifier path, short version) {
        super(path, version);
    }

    @Override
    public CheckedFuture<Optional<NormalizedNode<?, ?>>, ReadFailedException> apply(
            DOMStoreReadTransaction readDelegate) {
        return readDelegate.read(getPath());
    }

    @Override
    public void processResponse(Object readResponse, SettableFuture<Optional<NormalizedNode<?, ?>>> returnFuture) {
        if (ReadDataReply.isSerializedType(readResponse)) {
            ReadDataReply reply = ReadDataReply.fromSerializable(readResponse);
            returnFuture.set(Optional.<NormalizedNode<?, ?>>fromNullable(reply.getNormalizedNode()));
        } else {
            returnFuture.setException(new ReadFailedException("Invalid response reading data for path " + getPath()));
        }
    }

    @Override
    protected AbstractRead<Optional<NormalizedNode<?, ?>>> newInstance(short withVersion) {
        return new ReadData(getPath(), withVersion);
    }

    public static ReadData fromSerializable(final Object serializable) {
        Preconditions.checkArgument(serializable instanceof ReadData);
        return (ReadData)serializable;
    }

    public static boolean isSerializedType(Object message) {
        return message instanceof ReadData;
    }
}