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OAI-PMH service provider implementation. Use it as a harvesting client to read remote repositories.

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/*
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */

package io.gdcc.xoai.serviceprovider.handler;

import static io.gdcc.xoai.model.oaipmh.verbs.Verb.Type.ListMetadataFormats;

import io.gdcc.xoai.model.oaipmh.results.MetadataFormat;
import io.gdcc.xoai.serviceprovider.client.OAIClient;
import io.gdcc.xoai.serviceprovider.exceptions.IdDoesNotExistException;
import io.gdcc.xoai.serviceprovider.exceptions.InvalidOAIResponse;
import io.gdcc.xoai.serviceprovider.exceptions.OAIRequestException;
import io.gdcc.xoai.serviceprovider.model.Context;
import io.gdcc.xoai.serviceprovider.parameters.ListMetadataParameters;
import io.gdcc.xoai.serviceprovider.parameters.Parameters;
import io.gdcc.xoai.serviceprovider.parsers.MetadataFormatParser;
import io.gdcc.xoai.xmlio.exceptions.XmlReaderException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class ListMetadataFormatsHandler {
    private final OAIClient client;

    public ListMetadataFormatsHandler(Context context) {
        this.client = context.getClient();
    }

    public List handle(ListMetadataParameters parameters)
            throws IdDoesNotExistException {
        List result = new ArrayList<>();
        Parameters requestParameters =
                Parameters.parameters().withVerb(ListMetadataFormats).include(parameters);

        try (InputStream stream = client.execute(requestParameters)) {
            MetadataFormatParser parser = new MetadataFormatParser(stream);
            while (parser.hasNext()) result.add(parser.next());
            return result;
        } catch (XmlReaderException | OAIRequestException | IOException e) {
            throw new InvalidOAIResponse(e);
        }
    }
}