ddf.catalog.impl.operations.MetacardFactory.java Source code

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Here is the source code for ddf.catalog.impl.operations.MetacardFactory.java

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/**
 * 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.impl.operations;

import ddf.catalog.data.Metacard;
import ddf.catalog.data.MetacardCreationException;
import ddf.catalog.data.impl.AttributeImpl;
import ddf.catalog.transform.CatalogTransformerException;
import ddf.catalog.transform.InputTransformer;
import ddf.mime.MimeTypeToTransformerMapper;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.activation.MimeType;
import javax.activation.MimeTypeParseException;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.codice.ddf.platform.util.uuidgenerator.UuidGenerator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Support class for creating metacards for the {@code CatalogFrameworkImpl}.
 *
 * <p>This factory class contains methods specific to metacard creation for the CFI and its support
 * classes. No operations/support methods should be added to this class except in support of CFI
 * metacard creation.
 */
public class MetacardFactory {
    private static final Logger LOGGER = LoggerFactory.getLogger(MetacardFactory.class);

    //
    // Injected properties
    //
    private final MimeTypeToTransformerMapper mimeTypeToTransformerMapper;

    private UuidGenerator uuidGenerator;

    public MetacardFactory(MimeTypeToTransformerMapper mimeTypeToTransformerMapper, UuidGenerator uuidGenerator) {
        this.mimeTypeToTransformerMapper = mimeTypeToTransformerMapper;
        this.uuidGenerator = uuidGenerator;
    }

    Metacard generateMetacard(String mimeTypeRaw, String id, String fileName, Path tmpContentPath)
            throws MetacardCreationException, MimeTypeParseException {

        Metacard generatedMetacard = null;

        MimeType mimeType = new MimeType(mimeTypeRaw);

        List<InputTransformer> listOfCandidates = mimeTypeToTransformerMapper.findMatches(InputTransformer.class,
                mimeType);
        List<String> stackTraceList = new ArrayList<>();

        LOGGER.debug("List of matches for mimeType [{}]: {}", mimeType, listOfCandidates);

        for (InputTransformer candidate : listOfCandidates) {
            try (InputStream transformerStream = com.google.common.io.Files.asByteSource(tmpContentPath.toFile())
                    .openStream()) {
                generatedMetacard = candidate.transform(transformerStream);
            } catch (CatalogTransformerException | IOException e) {
                List<String> stackTraces = Arrays.asList(ExceptionUtils.getRootCauseStackTrace(e));
                stackTraceList.add(String.format("Transformer [%s] could not create metacard.", candidate));
                stackTraceList.addAll(stackTraces);
                LOGGER.debug("Transformer [{}] could not create metacard.", candidate, e);
            }
            if (generatedMetacard != null) {
                break;
            }
        }

        if (generatedMetacard == null) {
            throw new MetacardCreationException(String.format("Could not create metacard with mimeType %s : %s",
                    mimeTypeRaw, StringUtils.join(stackTraceList, "\n")));
        }

        if (id != null) {
            generatedMetacard.setAttribute(new AttributeImpl(Metacard.ID, id));
        } else {
            generatedMetacard.setAttribute(new AttributeImpl(Metacard.ID, uuidGenerator.generateUuid()));
        }

        if (StringUtils.isBlank(generatedMetacard.getTitle())) {
            generatedMetacard.setAttribute(new AttributeImpl(Metacard.TITLE, fileName));
        }

        return generatedMetacard;
    }
}