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 015package org.apache.tapestry5.internal.services; 016 017import org.apache.tapestry5.ComponentResources; 018import org.apache.tapestry5.ContentType; 019import org.apache.tapestry5.MetaDataConstants; 020import org.apache.tapestry5.SymbolConstants; 021import org.apache.tapestry5.internal.structure.Page; 022import org.apache.tapestry5.ioc.annotations.Symbol; 023import org.apache.tapestry5.services.MetaDataLocator; 024 025public 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}