    001    // Copyright 2007, 2008, 2010 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
    015    package org.apache.tapestry5.internal.services;
    016
    017    import org.apache.tapestry5.ComponentResources;
    018    import org.apache.tapestry5.ContentType;
    019    import org.apache.tapestry5.MetaDataConstants;
    020    import org.apache.tapestry5.SymbolConstants;
    021    import org.apache.tapestry5.internal.structure.Page;
    022    import org.apache.tapestry5.ioc.annotations.Symbol;
    023    import org.apache.tapestry5.services.MetaDataLocator;
    024
    025    public class PageContentTypeAnalyzerImpl implements PageContentTypeAnalyzer
    026    {
    027        private final MetaDataLocator metaDataLocator;
    028
    029        private final String outputCharset;
    030
    031        public PageContentTypeAnalyzerImpl(MetaDataLocator metaDataLocator,
    032
    033        @Symbol(SymbolConstants.CHARSET)
    034        String outputCharset)
    035        {
    036            this.metaDataLocator = metaDataLocator;
    037            this.outputCharset = outputCharset;
    038        }
    039
    040        public ContentType findContentType(Page page)
    041        {
    042            ComponentResources pageResources = page.getRootComponent().getComponentResources();
    043
    044            String contentTypeString = metaDataLocator.findMeta(MetaDataConstants.RESPONSE_CONTENT_TYPE, pageResources,
    045                    String.class);
    046
    047            // Draconian but necessary: overwrite the content type they selected with the application-wide output charset.
    048
    049            return new ContentType(contentTypeString, outputCharset);
    050        }
    051    }