/*******************************************************************************
* Copyright (c) 2001, 2008 Oracle Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Oracle Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.ui.internal.jspeditor;
import org.eclipse.jface.text.Region;
import org.eclipse.jst.jsf.context.resolver.structureddocument.IStructuredDocumentContextResolverFactory;
import org.eclipse.jst.jsf.context.resolver.structureddocument.internal.ITextRegionContextResolver;
import org.eclipse.jst.jsf.context.structureddocument.IStructuredDocumentContext;
import org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser;
import org.eclipse.jst.jsf.core.internal.contentassist.el.SymbolInfo;
import org.eclipse.jst.jsf.designtime.DTAppManagerUtil;
import org.eclipse.jst.jsf.designtime.internal.view.XMLViewDefnAdapter;
import org.eclipse.jst.jsf.designtime.internal.view.IDTViewHandler.ViewHandlerException;
import org.eclipse.jst.jsf.designtime.internal.view.XMLViewDefnAdapter.DTELExpression;
import org.eclipse.wst.xml.core.internal.regions.DOMRegionContext;
/**
* Utility class to access EL symbols in jsp file.
*/
public final class JSPSourceUtil
{
private JSPSourceUtil()
{
// utility class, no instances.
}
/**
* Find the Region
*
* @param context -
* the IStructuredDocumentContext
* @return region of el expression, null if context doesn't point to an el
* expression
*/
public static Region findELRegion(final IStructuredDocumentContext context)
{
if (context != null)
{
final DTELExpression expression = getELExpression(context);
if (expression != null)
{
final ITextRegionContextResolver resolver = IStructuredDocumentContextResolverFactory.INSTANCE
.getTextRegionResolver(expression.getDocumentContext());
if (resolver != null)
{
final String regionType = resolver.getRegionType();
if (regionType != null)
{
if (regionType == DOMRegionContext.XML_TAG_ATTRIBUTE_VALUE)
{
return new Region(expression.getDocumentContext()
.getDocumentPosition(), expression
.getText().length());
}
else if (resolver.matchesRelative(new String[]
{ DOMRegionContext.XML_TAG_ATTRIBUTE_VALUE }))
{
return new Region(resolver.getStartOffset(),
resolver.getLength());
}
}
}
}
}
return null;
}
/**
* Determines symbol and symbol region at a given document position
*
* @param context -
* the IStructuredDocumentContext
* @param elRegion -
* the region of the el expression to consider
* @param documentPosition -
* the document position to get the symbol for
* @return SymbolInfo
*/
public static SymbolInfo determineSymbolInfo(
final IStructuredDocumentContext context, final Region elRegion,
final int documentPosition)
{
if (context != null && elRegion != null)
{
final DTELExpression elExpression = getELExpression(context);
final String elText = elExpression.getText().trim();
// context.getStructuredDocument().get(
// elRegion.getOffset(), elRegion.getLength());
final SymbolInfo symbolInfo =
ContentAssistParser.getSymbolInfo(context,
documentPosition - elRegion.getOffset() + 1,
elText);
return symbolInfo;
}
return null;
}
private static DTELExpression getELExpression(
final IStructuredDocumentContext context)
{
final XMLViewDefnAdapter adapter = DTAppManagerUtil
.getXMLViewDefnAdapter(context);
DTELExpression expression = null;
if (adapter != null)
{
try
{
expression = adapter.getELExpression(context);
}
catch (ViewHandlerException e)
{
expression = null;
}
}
return expression;
}
}