package org.eclipse.jst.jsf.facelet.core.internal.registry.taglib;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.URIUtil;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.ContentHandler;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.URIConverter;
import org.eclipse.emf.ecore.resource.URIHandler;
import org.eclipse.emf.ecore.resource.impl.ExtensibleURIConverterImpl;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.resource.impl.URIHandlerImpl;
import org.eclipse.emf.ecore.util.BasicExtendedMetaData;
import org.eclipse.emf.ecore.util.ExtendedMetaData;
import org.eclipse.emf.ecore.xmi.XMLResource;
import org.eclipse.jst.jsf.facelet.core.internal.FaceletCorePlugin;
import org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.faceletTaglib.DocumentRoot;
import org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.faceletTaglib.FaceletTaglib;
import org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.faceletTaglib.FaceletTaglibPackage;
import org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.faceletTaglib.util.FaceletTaglibResourceFactoryImpl;
import org.eclipse.wst.xml.core.internal.XMLCorePlugin;
import org.eclipse.wst.xml.core.internal.catalog.provisional.ICatalog;
import org.eclipse.wst.xml.core.internal.catalog.provisional.ICatalogEntry;
import org.eclipse.wst.xml.core.internal.catalog.provisional.INextCatalog;
/**
* Loads the facelet taglib file model using EMF.
*
* @author cbateman
*
*/
public class TagModelLoader
{
private final ResourceSetImpl _resSet;
private final String _resourceUri;
private DocumentRoot _docRoot;
private FaceletTaglib _faceletTaglib;
private final static List<URIHandler> DEFAULT_URI_HANDLERS;
static
{
final List<URIHandler> handlers = new ArrayList<URIHandler>();
final URIHandler handleFacelet = new DefaultFaceletURIHandler();
handlers.add(handleFacelet);
handlers.addAll(URIHandler.DEFAULT_HANDLERS);
DEFAULT_URI_HANDLERS = handlers;
}
/**
* @param resourceUri
*/
public TagModelLoader(final String resourceUri)
{
this(resourceUri, new ExtensibleURIConverterImpl(DEFAULT_URI_HANDLERS,
ContentHandler.Registry.INSTANCE.contentHandlers()));
}
/**
* @param resourceUri
* @param uriConverter
*/
public TagModelLoader(final String resourceUri,
final URIConverter uriConverter)
{
_resourceUri = resourceUri;
_resSet = new ResourceSetImpl();
_resSet.getPackageRegistry().put("http://java.sun.com/xml/ns/javaee", //$NON-NLS-1$
FaceletTaglibPackage.eINSTANCE);
_resSet.getPackageRegistry().put(
"http://java.sun.com/xml/ns/javaee/web-facelettaglibrary.xsd", //$NON-NLS-1$
FaceletTaglibPackage.eINSTANCE);
_resSet.setURIConverter(uriConverter);
final ExtendedMetaData extendedMetaData = new BasicExtendedMetaData(
_resSet.getPackageRegistry());
_resSet.getLoadOptions().put(XMLResource.OPTION_EXTENDED_META_DATA,
extendedMetaData);
_resSet.getResourceFactoryRegistry().getExtensionToFactoryMap()
.put("xml", new FaceletTaglibResourceFactoryImpl()); //$NON-NLS-1$
}
/**
* @param is
* @throws Exception
*/
public void loadFromInputStream(final InputStream is) throws Exception
{
final Resource res = _resSet.createResource(URI
.createFileURI(_resourceUri));
if (res != null)
{
Map<String, Object> options = new HashMap<String, Object>();
options.put(XMLResource.OPTION_RECORD_UNKNOWN_FEATURE, Boolean.TRUE);
res.load(is, options);
final EObject eObject = res.getContents().get(0);
_docRoot = (DocumentRoot) eObject;
_faceletTaglib = _docRoot.getFaceletTaglib();
} else
{
// This is often caused if the extension of the file pointed to
// by _resourceUri wasn't initialized in extensionToFactoryMap.
throw new IllegalArgumentException("Could not create Resource"); //$NON-NLS-1$
}
}
/**
* @param os
* @throws Exception
*/
public void save(final OutputStream os) throws Exception
{
final Resource res = _resSet.createResource(URI
.createFileURI(_resourceUri));
if (res != null)
{
res.getContents().add(_docRoot);
res.save(os, Collections.EMPTY_MAP);
} else
{
throw new IllegalArgumentException("Could not create Resource"); //$NON-NLS-1$
}
}
/**
* @param faceletTaglib
*/
public final void setTaglib(final FaceletTaglib faceletTaglib)
{
_faceletTaglib = faceletTaglib;
}
/**
* @param docRoot
*/
public final void setDocRoot(final DocumentRoot docRoot)
{
_docRoot = docRoot;
}
/**
* @return the taglib or null if none has been loaded.
*/
public FaceletTaglib getTaglib()
{
return _faceletTaglib;
}
/**
* @return the doc root or null if none has been loaded.
*/
public DocumentRoot getDocRoot()
{
return _docRoot;
}
/**
* Handles facelet taglib dtd resolver requests
*
*/
private static final class DefaultFaceletURIHandler extends URIHandlerImpl
{
@Override
public boolean canHandle(final URI uri)
{
return "http://java.sun.com/dtd/facelet-taglib_1_0.dtd".equals(uri.toString()); //$NON-NLS-1$
}
@Override
public InputStream createInputStream(final URI uri, final Map<?, ?> options)
throws IOException
{
try
{
return findFaceletDtdInCatalog();
} catch (final URISyntaxException e)
{
FaceletCorePlugin.log(
"While trying to load facelet dtd from catalog", e); //$NON-NLS-1$
// fall through
}
return null;
}
private InputStream findFaceletDtdInCatalog() throws URISyntaxException, IOException
{
final ICatalog xmlCatalog = XMLCorePlugin.getDefault()
.getDefaultXMLCatalog();
if (xmlCatalog != null)
{
ICatalog systemCatalog = null;
final INextCatalog[] nextCatalogs = xmlCatalog.getNextCatalogs();
for (final INextCatalog catalog : nextCatalogs)
{
final ICatalog referencedCatalog = catalog
.getReferencedCatalog();
if (referencedCatalog != null)
{
if (XMLCorePlugin.SYSTEM_CATALOG_ID
.equals(referencedCatalog.getId()))
{
systemCatalog = referencedCatalog;
}
}
}
if (systemCatalog != null)
{
ICatalogEntry foundEntry = null;
for (final ICatalogEntry entry : systemCatalog.getCatalogEntries())
{
if ("-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN" //$NON-NLS-1$
.equals(entry.getKey()))
{
foundEntry = entry;
break;
}
}
if (foundEntry != null)
{
final java.net.URI uri = URIUtil.fromString(foundEntry.getURI());
final URL url = URIUtil.toURL(uri);
return url.openStream();
}
}
}
return null;
}
}
}