ObjectAdapter.java

/**
 * Copyright (c) Codice Foundation
 * <p>
 * This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 * <p>
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 */
package ddf.catalog.transformer.xml.adapter;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import javax.xml.bind.annotation.adapters.XmlAdapter;

import ddf.catalog.data.Attribute;
import ddf.catalog.data.impl.AttributeImpl;
import ddf.catalog.transform.CatalogTransformerException;
import ddf.catalog.transformer.xml.binding.ObjectElement;

public class ObjectAdapter extends XmlAdapter<ObjectElement, Attribute> {

    public static ObjectElement marshalFrom(Attribute attribute)
            throws CatalogTransformerException {

        ObjectElement element = new ObjectElement();
        element.setName(attribute.getName());
        if (attribute.getValue() != null) {
            for (Serializable value : attribute.getValues()) {
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                ObjectOutputStream oos;
                try {
                    oos = new ObjectOutputStream(baos);
                    oos.writeObject(value);
                    oos.close();
                } catch (IOException e) {
                    throw new CatalogTransformerException(
                            "Could not transform Metacard to XML.  Could not serialize Attribute Object value.",
                            e);
                }
                ((ObjectElement) element).getValue()
                        .add(baos.toByteArray());
            }
        }
        return element;
    }

    public static Attribute unmarshalFrom(ObjectElement element) {
        AttributeImpl attribute = null;
        for (Serializable value : element.getValue()) {
            if (attribute == null) {
                attribute = new AttributeImpl(element.getName(), value);
            } else {
                attribute.addValue(value);
            }
        }
        return attribute;
    }

    @Override
    public ObjectElement marshal(Attribute attribute) throws CatalogTransformerException {
        return marshalFrom(attribute);
    }

    @Override
    public Attribute unmarshal(ObjectElement element) {
        return unmarshalFrom(element);
    }

}