    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005// http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.internal.services;
    014
    015import org.apache.tapestry5.ComponentResources;
    016import org.apache.tapestry5.ContentType;
    017import org.apache.tapestry5.MetaDataConstants;
    018import org.apache.tapestry5.SymbolConstants;
    019import org.apache.tapestry5.internal.structure.Page;
    020import org.apache.tapestry5.ioc.annotations.Symbol;
    021import org.apache.tapestry5.services.MetaDataLocator;
    022
    023public class PageContentTypeAnalyzerImpl implements PageContentTypeAnalyzer
    024{
    025    private final MetaDataLocator metaDataLocator;
    026
    027    private final String outputCharset;
    028
    029    public PageContentTypeAnalyzerImpl(MetaDataLocator metaDataLocator,
    030
    031    @Symbol(SymbolConstants.CHARSET)
    032    String outputCharset)
    033    {
    034        this.metaDataLocator = metaDataLocator;
    035        this.outputCharset = outputCharset;
    036    }
    037
    038    public ContentType findContentType(Page page)
    039    {
    040        ComponentResources pageResources = page.getRootComponent().getComponentResources();
    041
    042        String contentTypeString = metaDataLocator.findMeta(MetaDataConstants.RESPONSE_CONTENT_TYPE, pageResources,
    043                String.class);
    044
    045        // Draconian but necessary: overwrite the content type they selected with the application-wide output charset.
    046
    047        return new ContentType(contentTypeString).withCharset(outputCharset);
    048    }
    049}