001// Copyright 2021 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.services;
016
017import java.io.IOException;
018import java.util.Map;
019import java.util.Objects;
020
021import org.apache.tapestry5.http.services.Response;
022import org.apache.tapestry5.services.ComponentEventResultProcessor;
023import org.apache.tapestry5.services.HttpStatus;
024
025/**
026 * Handles {@link HttpStatus}.values returned by event handler methods.
027 *
028 * @since 5.8.0
029 */
030public class HttpStatusComponentEventResultProcessor implements ComponentEventResultProcessor<HttpStatus>
031{
032    private final Response response;
033
034    public HttpStatusComponentEventResultProcessor(Response response)
035    {
036        this.response = response;
037    }
038
039    public void processResultValue(HttpStatus value) throws IOException
040    {
041        response.setStatus(value.getStatusCode());
042        final Map<String, String> extraHttpHeaders = value.getExtraHttpHeaders();
043        for (String header : extraHttpHeaders.keySet())
044        {
045            final String headerValue = extraHttpHeaders.get(header);
046            response.setHeader(header, headerValue);
047        }
048        if (value.getResponseBody() != null)
049        {
050            Objects.requireNonNull(value.getContentType(), "HttpStatus.mimeType cannot be null");
051            response.getPrintWriter(value.getContentType()).append(value.getResponseBody()).close();
052        }
053    }
054}