GeometryTransformer.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;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import javax.xml.bind.helpers.DefaultValidationEventHandler;

import org.codice.ddf.parser.Parser;
import org.codice.ddf.parser.ParserConfigurator;
import org.codice.ddf.parser.ParserException;

import ddf.catalog.data.Attribute;
import ddf.catalog.data.BinaryContent;
import ddf.catalog.data.impl.BinaryContentImpl;
import ddf.catalog.transform.CatalogTransformerException;
import ddf.catalog.transformer.xml.adapter.GeometryAdapter;

/**
 * Transforms Geometry object to BinaryContent
 */
class GeometryTransformer extends AbstractXmlTransformer {
    private static final int BUFFER_SIZE = 512;

    public GeometryTransformer(Parser parser) {
        super(parser);
    }

    public BinaryContent transform(Attribute attribute) throws CatalogTransformerException {
        ParserConfigurator parserConfigurator =
                getParserConfigurator().setHandler(new DefaultValidationEventHandler());

        try {
            ByteArrayOutputStream os = new ByteArrayOutputStream(BUFFER_SIZE);
            getParser().marshal(parserConfigurator, GeometryAdapter.marshalFrom(attribute), os);
            ByteArrayInputStream bais = new ByteArrayInputStream(os.toByteArray());
            return new BinaryContentImpl(bais, MIME_TYPE);
        } catch (ParserException e) {
            throw new CatalogTransformerException("Failed to marshall geometry data", e);
        }
    }
}