/*******************************************************************************
 * Copyright (c) 2006 Oracle Corporation.
 * 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:
 *    Cameron Bateman/Oracle - initial API and implementation
 *    
 ********************************************************************************/

package org.eclipse.jst.jsf.designtime.internal.symbols;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jst.jsf.context.symbol.ISymbol;
import org.eclipse.jst.jsf.context.symbol.source.AbstractSymbolSourceProviderFactory;
import org.eclipse.jst.jsf.context.symbol.source.ISymbolConstants;
import org.eclipse.jst.jsf.context.symbol.source.ISymbolSourceProvider;
import org.eclipse.jst.jsf.core.internal.JSFCorePlugin;
import org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor;
import org.eclipse.jst.jsf.designtime.symbols.FileContextUtil;
import org.eclipse.jst.jsf.designtime.symbols.SymbolUtil;


/**
 * Self-factory for a symbol provider that derives symbol information from
 * meta-data annotations on tag attributes that declare runtime EL variables
 * 
 * @author cbateman
 *
 */
public class JSPTagVariableSymbolSourceProvider extends
        AbstractSymbolSourceProviderFactory implements ISymbolSourceProvider 
{
    protected ISymbolSourceProvider create(IProject project) 
    {
        return this;
    }

    public ISymbol[] getSymbols(IAdaptable context, int symbolScopeMask) 
    {
        final IFile   fileContext = FileContextUtil.deriveIFileFromContext(context);
        
        if (isProvider(fileContext))
        {
        	JSPModelProcessor modelProcessor = null;
        	
            try
            {
                modelProcessor = JSPModelProcessor.get(fileContext);
                
                // ensure internal model is sync'ed with document
                // but don't force refresh
                modelProcessor.refresh(false);
                final List<ISymbol> symbols = new ArrayList();
                
                if ((symbolScopeMask & ISymbolConstants.SYMBOL_SCOPE_REQUEST) != 0)
                {
                    symbols.addAll(modelProcessor.getMapForScope(ISymbolConstants.SYMBOL_SCOPE_REQUEST_STRING).values());
                }
                if ((symbolScopeMask & ISymbolConstants.SYMBOL_SCOPE_SESSION) != 0)
                {
                    symbols.addAll(modelProcessor.getMapForScope(ISymbolConstants.SYMBOL_SCOPE_SESSION_STRING).values());
                }
                if ((symbolScopeMask & ISymbolConstants.SYMBOL_SCOPE_APPLICATION) != 0)
                {
                    symbols.addAll(modelProcessor.getMapForScope(ISymbolConstants.SYMBOL_SCOPE_APPLICATION_STRING).values());
                }
                if ((symbolScopeMask & ISymbolConstants.SYMBOL_SCOPE_NONE) != 0)
                {
                    symbols.addAll(modelProcessor.getMapForScope(ISymbolConstants.SYMBOL_SCOPE_NONE_STRING).values());
                }
                    
                return symbols.toArray(ISymbol.EMPTY_SYMBOL_ARRAY);
            }
            catch (Exception e)
            {
                JSFCorePlugin.getDefault().getLog().log(new Status(IStatus.ERROR, JSFCorePlugin.PLUGIN_ID, 0, "Error acquiring model processor",e)); //$NON-NLS-1$
                // fall-through to empty symbol array
            }
        }
        
        return ISymbol.EMPTY_SYMBOL_ARRAY;
    }

    public ISymbol[] getSymbols(String prefix, IAdaptable context,
            int symbolScopeMask) {
        return SymbolUtil.
            filterSymbolsByPrefix(getSymbols(context, symbolScopeMask), prefix);
    }

    public boolean isProvider(IAdaptable context) 
    {
        IFile file = FileContextUtil.deriveIFileFromContext(context);
        
        return (file != null
                && file.getProject() == this.getProject());
    }
}