001/*
002 * JGrapes Event Driven Framework
003 * Copyright (C) 2016-2018 Michael N. Lipp
004 * 
005 * This program is free software; you can redistribute it and/or modify it 
006 * under the terms of the GNU Affero General Public License as published by 
007 * the Free Software Foundation; either version 3 of the License, or 
008 * (at your option) any later version.
009 * 
010 * This program is distributed in the hope that it will be useful, but 
011 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
012 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License 
013 * for more details.
014 * 
015 * You should have received a copy of the GNU Affero General Public License along 
016 * with this program; if not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jgrapes.http.events;
020
021import java.nio.charset.Charset;
022import java.util.Map.Entry;
023import java.util.Optional;
024import java.util.stream.Stream;
025import org.jdrupes.httpcodec.MessageHeader;
026import org.jdrupes.httpcodec.protocols.http.HttpField;
027import org.jdrupes.httpcodec.protocols.http.HttpResponse;
028import org.jdrupes.httpcodec.types.Converters;
029
030/**
031 * Represents the response (header).
032 */
033public class Response extends MessageReceived<Void> {
034
035    @SuppressWarnings("PMD.AvoidFieldNameMatchingTypeName")
036    private final MessageHeader response;
037
038    /**
039     * Instantiates a new response.
040     *
041     * @param response the response
042     */
043    public Response(MessageHeader response) {
044        this.response = response;
045    }
046
047    /**
048     * @return the response
049     */
050    public MessageHeader response() {
051        return response;
052    }
053
054    /**
055     * Convenience method for retrieving the {@link Charset}
056     * from the response.
057     *
058     * @return the optional
059     */
060    @SuppressWarnings("PMD.AvoidCatchingGenericException")
061    public Optional<Charset> charset() {
062        return ((HttpResponse) response())
063            .findValue(HttpField.CONTENT_TYPE, Converters.MEDIA_TYPE)
064            .map(mt -> mt.parameters().entrySet().stream())
065            .orElse(Stream.empty())
066            .filter(e -> "charset".equalsIgnoreCase(e.getKey()))
067            .findFirst().map(Entry::getValue).map(csn -> {
068                try {
069                    return Charset.forName(csn);
070                } catch (Exception e) {
071                    return null;
072                }
073            });
074    }
075
076}