001/**
002 * Copyright 2015 DuraSpace, Inc.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.fcrepo.transform;
017
018import org.fcrepo.transform.transformations.LDPathTransform;
019import org.fcrepo.transform.transformations.SparqlQueryTransform;
020
021import javax.ws.rs.core.MediaType;
022
023import java.io.InputStream;
024import java.util.HashMap;
025import java.util.Map;
026import java.util.function.Function;
027
028import static org.apache.jena.riot.WebContent.contentTypeSPARQLQuery;
029import static org.fcrepo.transform.transformations.LDPathTransform.APPLICATION_RDF_LDPATH;
030
031/**
032 * Get a Transformation from a MediaType
033 *
034 * @author cbeer
035 * @author ajs6f
036 */
037public class TransformationFactory {
038
039    @SuppressWarnings("rawtypes")
040    private final Map<String, Function<InputStream, Transformation>> mimeToTransform = new HashMap<>();
041
042    /**
043     * Get a new TransformationFactory with the default classes
044     * @throws SecurityException if security exception occurred
045     */
046    public TransformationFactory() {
047        mimeToTransform.put(contentTypeSPARQLQuery, SparqlQueryTransform::new);
048        mimeToTransform.put(APPLICATION_RDF_LDPATH, LDPathTransform::new);
049    }
050
051    /**
052     * Get a Transformation from a MediaType and an InputStream with
053     * the transform program
054     * @param <T> the transformation type
055     * @param contentType the content type
056     * @param inputStream the input stream
057     * @return T a Transformation
058     */
059    @SuppressWarnings("unchecked")
060    public <T> Transformation<T> getTransform(final MediaType contentType, final InputStream inputStream) {
061        final String mimeType = contentType.toString();
062        if (mimeToTransform.containsKey(mimeType)) {
063            return mimeToTransform.get(contentType.toString()).apply(inputStream);
064        }
065        throw new UnsupportedOperationException(
066                "No transform type exists for media type " + mimeType + "!");
067    }
068}