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Private implementation of the Apache MyFaces Trinidad project
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.trinidadinternal.style.xml;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.apache.myfaces.trinidad.share.io.NameResolver;
import org.apache.myfaces.trinidadinternal.share.io.DefaultNameResolver;
import org.apache.myfaces.trinidadinternal.share.xml.ClassParserFactory;
import org.apache.myfaces.trinidadinternal.share.xml.ParseContextImpl;
import org.apache.myfaces.trinidadinternal.share.xml.ParserFactory;
import org.apache.myfaces.trinidadinternal.share.xml.ParserManager;
import org.apache.myfaces.trinidadinternal.share.xml.XMLProvider;
import org.apache.myfaces.trinidadinternal.share.xml.XMLUtils;
import org.apache.myfaces.trinidadinternal.style.StyleConstants;
import org.apache.myfaces.trinidadinternal.style.xml.parse.ColorNode;
import org.apache.myfaces.trinidadinternal.style.xml.parse.IncludePropertyNode;
import org.apache.myfaces.trinidadinternal.style.xml.parse.PropertyNode;
import org.apache.myfaces.trinidadinternal.style.xml.parse.StyleNode;
import org.apache.myfaces.trinidadinternal.style.xml.parse.StyleSheetDocument;
import org.apache.myfaces.trinidadinternal.style.xml.parse.StyleSheetNode;
import org.apache.myfaces.trinidad.logging.TrinidadLogger;
/**
* Utility class for creating a StyleSheetDocument.
*
* @version $Name: $ ($Revision: adfrt/faces/adf-faces-impl/src/main/java/oracle/adfinternal/view/faces/style/xml/StyleSheetDocumentUtils.java#0 $) $Date: 10-nov-2005.18:58:00 $
*/
public class StyleSheetDocumentUtils
{
/**
* Creates a StyleSheetDocument from the specified InputSource (.xss file)
*
* @param provider The XMLProvider to use to parse the source document
* @param source The InputSource for the source document. The system
* id of the InputSource must be the file system path of the
* source document.
*/
public static StyleSheetDocument createStyleSheetDocument(
XMLProvider provider,
InputSource source
) throws IOException, SAXException
{
// Make sure we've got a source file
String sourceName = source.getSystemId();
if ((sourceName == null))
{
throw new IllegalArgumentException(_LOG.getMessage(
"NULL_SOURCENAME"));
}
return createStyleSheetDocument(
provider,
new DefaultNameResolver(new File(sourceName), null),
sourceName);
}
/**
* Creates a StyleSheetDocument from the specified InputSource (.xss file)
* @param xmlProvider The XMLProvider to use to parse the source document
* @param resolver The NameResolver to use to locate the source document.
* This must be a non-null instance.
* @param sourceName The name of the source XSS document. This value
* must resolve to a valid document via the provided
* NameResolver.
*/
public static StyleSheetDocument createStyleSheetDocument(
XMLProvider xmlProvider,
NameResolver resolver,
String sourceName
) throws IOException, SAXException
{
// We always require a source name and a resolver
if ((sourceName == null)||(resolver == null))
{
throw new NullPointerException(_LOG.getMessage(
"NULL_ARGUMENT"));
}
// Gather all of the the objects that we need for the parse
ParserManager manager = _getDefaultParserManager();
ParseContextImpl parseContext = new ParseContextImpl();
// Parse it!
return (StyleSheetDocument)XMLUtils.parseSource(parseContext,
xmlProvider,
manager,
resolver,
sourceName,
StyleSheetDocument.class);
}
/**
* Merges two StyleSheetDocuments to produce a new StyleSheetDocuments
* which combines styles from both documents. If styles appear in
* both documents, the style properties in the second StyleSheetDocument
* take precedence.
*
* @param document1 The base StyleSheetDocument
* @param document2 A second StyleSheetDocument which overrides
* properties from the base StyleSheetDocument.
*
*/
public static StyleSheetDocument mergeStyleSheetDocuments(
StyleSheetDocument document1,
StyleSheetDocument document2
)
{
if (document1 == null)
return document2;
if (document2 == null)
return document1;
// If neither document is null, merge the two documents together.
// Start by getting the new document version
String documentVersion = _mergeDocumentVersions(document1, document2);
// The new document timestamp is just the max of the two old timestamps
long documentTimestamp = Math.max(document1.getDocumentTimestamp(),
document2.getDocumentTimestamp());
// Now get the merged set of StyleSheetNodes
List styleSheetsList =
new ArrayList();
_addStyleSheets(styleSheetsList, document1);
_addStyleSheets(styleSheetsList, document2);
int styleSheetsCount = styleSheetsList.size();
StyleSheetNode[] styleSheetsArray = new StyleSheetNode[styleSheetsCount];
styleSheetsList.toArray(styleSheetsArray);
return new StyleSheetDocument(styleSheetsArray,
documentVersion,
documentTimestamp);
}
// Adds the StyleSheetNodes from the specified StyleSheetDocument
// into the List of StyleSheetNodes.
private static void _addStyleSheets(
List styleSheets,
StyleSheetDocument document
)
{
Iterator e = document.getStyleSheets();
while (e.hasNext())
styleSheets.add(e.next());
}
// Merges the StyleSheetDocument versions of two documents
private static String _mergeDocumentVersions(
StyleSheetDocument document1,
StyleSheetDocument document2
)
{
// Both documents should be non-null when calling this
assert ((document1 != null) && (document2 != null));
String version1 = document1.getDocumentVersion();
String version2 = document2.getDocumentVersion();
if (version1 == null)
return version2;
if (version2 == null)
return version1;
return version1 + version2;
}
private static ParserManager _getDefaultParserManager()
{
if (_sDefaultParserManager == null)
{
ParserManager manager = new ParserManager();
_registerFactory(
manager, StyleSheetDocument.class, "StyleSheetDocument");
_registerFactory(manager, StyleSheetNode.class, "StyleSheetNode");
_registerFactory(manager, StyleNode.class, "StyleNode");
_registerFactory(manager, PropertyNode.class, "PropertyNode");
_registerFactory(manager, ColorNode.class, "ColorNode");
_registerFactory(manager,
IncludePropertyNode.class,
"IncludePropertyNode");
_registerFactory(manager, String.class, "ValueNode");
_sDefaultParserManager = manager;
}
return _sDefaultParserManager;
}
private static void _registerFactory(
ParserManager manager,
Class expectedType,
String baseName
)
{
String className = "org.apache.myfaces.trinidadinternal.style.xml.parse." + baseName + "Parser";
ParserFactory factory = new ClassParserFactory(className);
manager.registerFactory(expectedType,
StyleConstants.OCELOT_NAMESPACE,
factory);
}
private static ParserManager _sDefaultParserManager;
private static final TrinidadLogger _LOG = TrinidadLogger.createTrinidadLogger(
StyleSheetDocumentUtils.class);
}
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