content: package com.japisoft.editix.document.xslt;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import com.japisoft.editix.ui.xslt.XMLDataSourcePanel;
  import com.japisoft.editix.ui.xslt.XSLTEditor;
  import com.japisoft.framework.collection.FastVector;
  import com.japisoft.framework.xml.parser.document.Document;
  import com.japisoft.framework.xml.parser.node.FPNode;
  
  import com.japisoft.xmlpad.XMLContainer;
  import com.japisoft.xmlpad.editor.XMLPadDocument;
  import com.japisoft.xmlpad.helper.handler.AbstractHelperHandler;
  import com.japisoft.xmlpad.helper.model.BasicDescriptor;
  
  /**
  This program is available under two licenses : 
  
  1. For non commercial usage : 
  
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  2. For commercial usage :
  
  You need to get a commercial license for source usage at : 
  
  http://www.editix.com/buy.html
  
  Copyright (c) 2018 Alexandre Brillant - JAPISOFT SARL - http://www.japisoft.com
  
  @author Alexandre Brillant - abrillant@japisoft.com
  @author JAPISOFT SARL - http://www.japisoft.com
  
  */
  public class XPathNodeHandler extends AbstractHelperHandler {
  
  	@Override
  	protected String getActivatorSequence() {
  		return null;
  	}
  	
  	public boolean haveDescriptors(
  			FPNode currentNode,
  			XMLPadDocument document, 
  			boolean insertBefore, 
  			int offset,
  			String activatorString ) {
  		return activatorString == null && document.isInsideAttributeValue( offset );
  	}
  	
  	protected void installDescriptors(
  			FPNode currentNode,
  			XMLPadDocument document,
  			int offset, 
  			String activatorString ) {
  		
  		XMLContainer container = document.getContainer();
  		XSLTEditor panel = ( XSLTEditor )container.getParentPanel();
  		XMLDataSourcePanel sourcePanel = panel.getSourcePanel();
  		FPNode rootNode = sourcePanel.getRootNode();
  		if ( rootNode != null ) {
  			String context = getXPathContext( currentNode );
  			List<String> res = choice( rootNode, context );
  			for ( String r : res ) {
  				addDescriptor( new BasicDescriptor( r ) );
  			}
  		}		
  	}	
  
  	private List<String> choice( FPNode rootNode, String context ) {
  		ArrayList<String> res = new ArrayList<String>();
  		Document doc = rootNode.getDocument();
  		FastVector fv = doc.getFlatNodes();
  		if ( fv != null ) {
  			for ( int i = 0; i < fv.size(); i++ ) {
  				FPNode node = ( FPNode )fv.get( i );
  				if ( context == null ) {
  					addResult( res, node );
  				} else {
  					if ( node.matchContent( context ) ) {
  						// Attribute
  						List<FPNode> attributes = node.getViewAttributeNodes();
  						if ( attributes != null ) {
  							for ( FPNode attNode : attributes ) {
  								addResult( res, attNode );
  							}
  						}						
  						// Children only
  						for ( int j = 0; j < node.getChildCount(); j++ ) {
  							addResult( res, ( FPNode )node.getChildAt( j ) );
  						}
  					}					
  				}
  			}
  		}
  		Collections.sort( res );
  		return res;
  	}
  
  	private void addResult( List<String> res, FPNode node ) {
  		if ( node.isTag() ) {
  			if ( !res.contains( node.getContent() ) )
  				res.add( node.getContent() );
  		} else {
  			if ( node.isAttribute() ) {
  				if ( !res.contains( "@" + node.getContent() ) )
  					res.add( "@" + node.getContent() );
  			}
  		}
  	}
  
  	private String getXPathContext( FPNode currentNode ) {
  		String context = null;
  		currentNode = currentNode.getFPParent();
  		while ( currentNode != null ) {
  			if ( currentNode.matchContent( "for-each" ) ) {
  				context = currentNode.getAttribute( "select" );
  				break;
  			} else
  			if ( currentNode.matchContent( "template" ) ) {
  				context = currentNode.getAttribute( "match" );
  				break;
  			} else
  				currentNode = currentNode.getFPParent();
  		}
  		if ( context != null ) {
  			String[] tmp = context.split( "/" );
  			for ( int i = 0; i < tmp.length; i++ ) {
  				if ( !tmp[ i ].startsWith( "@" ) )
  					context = tmp[ i ];
  			}
  			int i = context.lastIndexOf( "[" );
  			if ( i > 0 )
  				context = context.substring( 0, i );
  		}
  		if ( "/".equals( context ) )
  			return null;
  		return context;
  	}
  
  }
  