content: package com.japisoft.framework.xml.parser.document;
  
  import java.util.Stack;
  
  import com.japisoft.framework.collection.FastVector;
  
  /**
  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 NamespaceContext extends FastVector {
  	private Stack defaultNamespaceSt;
  
  	/**
  	 * @return the default namespace from the attribute xmlns */
  	public String currentDefaultNamespace() {
  		if ( defaultNamespaceSt == null )
  			return null;
  		if ( defaultNamespaceSt.isEmpty() )
  			return null;
  		return (String)defaultNamespaceSt.peek();
  	}
  
  	/**
  	 * Reset the default namespace
  	 * @param defaultNamespace  */
  	public void pushDefaultNamespace(String defaultNamespace) {
  		if ( defaultNamespaceSt == null )
  			defaultNamespaceSt = new Stack();
  		defaultNamespaceSt.push( defaultNamespace );
  	}
  
  	/** Remove the last default namespace */
  	public void popDefaultNamespace() {
  		if ( defaultNamespaceSt != null )
  			defaultNamespaceSt.pop();
  	}
  
  	/** Add a current prefix for this uri */
  	public void addPrefixScope( String prefix, String uri ) {
  		add( new PrefixURI( prefix, uri ) );
  	}
  
  	/** Remove a prefix that should not be accessible */
  	public void removePrefixScope( String prefix ) {
  		remove( prefix );
  	}
  
  	/** @return true if this prefix is available */
  	public boolean isPrefixAvaiable( String prefix ) {
  		return contains( prefix );
  	}
  	
  	/** @return the URI for this prefix */
  	public String getPrefixURI( String prefix ) {
  		for ( int i = 0; i < size(); i++ ) {
  			Object o;
  			if ( ( o = get( i ) ).equals( prefix ) ) {
  				return ((PrefixURI)o).uri;
  			}
  		}	
  		return null;
  	}
  
  	// ----------------------------------------------------
  
  	class PrefixURI {
  		public String prefix;
  		public String uri;
  
  		PrefixURI( String prefix, String uri ) {
  			this.prefix = prefix;
  			this.uri = uri;
  		}
  
  		public boolean equals( Object o ) {
  			if ( o instanceof String ) {
  				return prefix.equals( o );
  			} else
  					return super.equals( o );
  		}
  	}
  
  }
  