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More .doc{x} -> html support - basic Tika conversion to HTML now enabled (lacks some of the required elements), image extraction remains stubbed out

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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@22335 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Nick Burch
2010-09-08 13:31:31 +00:00
parent 241a50a409
commit 4847620d2e
6 changed files with 119 additions and 26 deletions
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122
source/java/org/alfresco/repo/rendition/executer/HTMLRenderingEngine.java
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@@ -20,15 +20,19 @@
package org.alfresco.repo.rendition.executer;
import java.io.Serializable;
import java.util.Collection;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import org.alfresco.model.ContentModel;
import org.alfresco.repo.action.ParameterDefinitionImpl;
import org.alfresco.repo.rendition.RenditionLocation;
import org.alfresco.service.cmr.action.ParameterDefinition;
import org.alfresco.service.cmr.dictionary.DataTypeDefinition;
import org.alfresco.service.cmr.dictionary.DictionaryService;
import org.alfresco.service.cmr.rendition.RenditionServiceException;
import org.alfresco.service.cmr.repository.ContentReader;
@@ -38,6 +42,12 @@ import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.namespace.QName;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AutoDetectParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.xml.sax.ContentHandler;
/**
* This class provides a way to turn documents supported by the
@@ -85,15 +95,18 @@ public class HTMLRenderingEngine extends AbstractRenderingEngine
String targetMimeType = "text/html";
// Check that Tika supports it
// TODO
AutoDetectParser p = new AutoDetectParser();
MediaType sourceMediaType = MediaType.parse(sourceMimeType);
if(! p.getParsers().containsKey(sourceMediaType))
{
throw new RenditionServiceException(
"Source mime type of " + sourceMimeType +
" is not supported by Tika for HTML conversions"
);
}
// Make the HTML Version
ContentWriter contentWriter = context.makeContentWriter();
// TODO
contentWriter.putContent(
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
"<html><body><h1>Test!</h1></body></html>"
);
// Make the HTML Version using Tika
generateHTML(p, context);
// Extract out any images
// TODO
@@ -110,16 +123,22 @@ public class HTMLRenderingEngine extends AbstractRenderingEngine
if(imgFolder == null)
imgFolder = createImagesDirectory(context);
// Create the node
properties.clear();
properties.put(ContentModel.PROP_NAME, fakeContent);
NodeRef img = nodeService.createNode(
imgFolder,
ContentModel.ASSOC_CONTAINS,
QName.createQName(fakeContent),
ContentModel.TYPE_CONTENT,
properties
).getChildRef();
// Create the node if needed
NodeRef img = nodeService.getChildByName(
imgFolder, ContentModel.ASSOC_CONTAINS, fakeContent
);
if(img == null)
{
properties.clear();
properties.put(ContentModel.PROP_NAME, fakeContent);
img = nodeService.createNode(
imgFolder,
ContentModel.ASSOC_CONTAINS,
QName.createQName(fakeContent),
ContentModel.TYPE_CONTENT,
properties
).getChildRef();
}
// If we can, associate it with the rendered HTML, so
// that they're properly linked
@@ -170,10 +189,18 @@ public class HTMLRenderingEngine extends AbstractRenderingEngine
}
folderName = folderName + "_files";
// It is already there?
// (eg from when the rendition is being re-run)
NodeRef imgFolder = nodeService.getChildByName(
parent, ContentModel.ASSOC_CONTAINS, folderName
);
if(imgFolder != null)
return imgFolder;
// Create the directory
Map<QName,Serializable> properties = new HashMap<QName,Serializable>();
properties.put(ContentModel.PROP_NAME, folderName);
NodeRef imgFolder = nodeService.createNode(
imgFolder = nodeService.createNode(
parent,
ContentModel.ASSOC_CONTAINS,
QName.createQName(folderName),
@@ -183,4 +210,53 @@ public class HTMLRenderingEngine extends AbstractRenderingEngine
return imgFolder;
}
/**
* Builds a Tika-compatible SAX content handler, which will
* be used to generate+capture the XHTML
*/
private ContentHandler buildContentHandler(Writer output)
{
SAXTransformerFactory factory = (SAXTransformerFactory)
SAXTransformerFactory.newInstance();
TransformerHandler handler;
try {
handler = factory.newTransformerHandler();
} catch (TransformerConfigurationException e) {
throw new RenditionServiceException("SAX Processing isn't available - " + e);
}
handler.getTransformer().setOutputProperty(OutputKeys.INDENT, "yes");
handler.setResult(new StreamResult(output));
handler.getTransformer().setOutputProperty(OutputKeys.METHOD, "xml");
return handler;
}
/**
* Asks Tika to translate the contents into HTML
*/
private void generateHTML(Parser p, RenderingContext context)
{
// Setup things to parse with
Metadata metadata = new Metadata();
ParseContext parseContext = new ParseContext();
StringWriter sw = new StringWriter();
ContentHandler handler = buildContentHandler(sw);
// Parse
try {
p.parse(
context.makeContentReader().getContentInputStream(),
handler, metadata, parseContext
);
} catch(Exception e) {
throw new RenditionServiceException("Tika HTML Conversion Failed", e);
}
// Save it
ContentWriter contentWriter = context.makeContentWriter();
contentWriter.putContent( sw.toString() );
}
}