/*
 * Copyright (c) 2015, 2017 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.config.facade.xml.mapping.attributes.toxml;

import com.google.common.base.Preconditions;
import com.google.common.io.BaseEncoding;
import java.util.List;
import org.opendaylight.controller.config.facade.xml.util.Util;
import org.w3c.dom.Document;

public class SimpleBinaryAttributeWritingStrategy extends SimpleAttributeWritingStrategy {

    public SimpleBinaryAttributeWritingStrategy(final Document document, final String key) {
        super(document, key);
    }

    @Override
    protected Object preprocess(final Object value) {
        Util.checkType(value, List.class);
        BaseEncoding en = BaseEncoding.base64();

        List<?> list = (List<?>) value;
        byte[] decoded = new byte[list.size()];
        int index = 0;
        for (Object basStr : list) {
            Preconditions.checkArgument(basStr instanceof String, "Unexpected inner value for %s, expected string",
                    value);
            decoded[index++] = Byte.parseByte((String) basStr);
        }
        return en.encode(decoded);
    }
}