001/* 002 * (C) Copyright 2006-2009 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Nuxeo - initial API and implementation 018 * 019 * $Id$ 020 */ 021 022package org.nuxeo.ecm.platform.preview.converters; 023 024import java.io.Serializable; 025import java.util.ArrayList; 026import java.util.List; 027import java.util.Map; 028 029import org.nuxeo.ecm.core.api.Blob; 030import org.nuxeo.ecm.core.api.blobholder.BlobHolder; 031import org.nuxeo.ecm.core.convert.api.ConversionException; 032import org.nuxeo.ecm.core.convert.api.ConversionService; 033import org.nuxeo.ecm.core.convert.api.ConverterCheckResult; 034import org.nuxeo.ecm.core.convert.extension.ConverterDescriptor; 035import org.nuxeo.ecm.core.convert.extension.ExternalConverter; 036import org.nuxeo.runtime.api.Framework; 037 038public class HtmlPreviewConverter implements ExternalConverter { 039 040 protected static ConversionService cs; 041 042 protected static Boolean canUsePDF2Html; 043 044 protected static Boolean canUseOOo2Html; 045 046 protected static ConversionService getConversionService() { 047 if (cs == null) { 048 cs = Framework.getLocalService(ConversionService.class); 049 } 050 return cs; 051 } 052 053 protected static boolean getCanUsePDF2Html() { 054 if (canUsePDF2Html == null) { 055 try { 056 canUsePDF2Html = getConversionService().isConverterAvailable("pdf2html").isAvailable(); 057 } catch (ConversionException e) { 058 return false; 059 } 060 } 061 return canUsePDF2Html; 062 } 063 064 protected static boolean getCanUseOOo2Html() { 065 if (canUseOOo2Html == null) { 066 try { 067 canUseOOo2Html = getConversionService().isConverterAvailable("office2html").isAvailable(); 068 } catch (ConversionException e) { 069 return false; 070 } 071 } 072 return canUseOOo2Html; 073 } 074 075 protected List<String> getConverterChain(String srcMT) { 076 List<String> subConverters = new ArrayList<String>(); 077 078 if (srcMT == null) { 079 return null; 080 } 081 082 if (srcMT.equals("text/html") || srcMT.equals("text/xml") || srcMT.equals("text/xhtml")) { 083 return subConverters; 084 } 085 086 if (getCanUsePDF2Html()) { 087 if (srcMT.equals("application/pdf")) { 088 subConverters.add("pdf2html"); 089 } else { 090 subConverters.add("any2pdf"); 091 subConverters.add("pdf2html"); 092 } 093 } else { 094 if (getCanUseOOo2Html()) { 095 subConverters.add("office2html"); 096 } else { 097 return null; 098 } 099 } 100 101 return subConverters; 102 } 103 104 @Override 105 public BlobHolder convert(BlobHolder blobHolder, Map<String, Serializable> parameters) throws ConversionException { 106 107 Blob sourceBlob = blobHolder.getBlob(); 108 109 List<String> subConverters = getConverterChain(sourceBlob.getMimeType()); 110 111 if (subConverters == null) { 112 throw new ConversionException("Can not find suitable underlying converters to handle html preview"); 113 } 114 115 BlobHolder result = blobHolder; 116 117 for (String converterName : subConverters) { 118 result = getConversionService().convert(converterName, result, parameters); 119 } 120 Blob blob = result.getBlob(); 121 if (blob != null && blob.getEncoding() == null) { 122 blob.setEncoding("UTF-8"); 123 } 124 return result; 125 } 126 127 @Override 128 public void init(ConverterDescriptor descriptor) { 129 // TODO Auto-generated method stub 130 } 131 132 @Override 133 public ConverterCheckResult isConverterAvailable() { 134 ConverterCheckResult result = new ConverterCheckResult(); 135 result.setAvailable(getCanUseOOo2Html() || getCanUsePDF2Html()); 136 return result; 137 } 138 139}