content: // (c) ALEXANDRE BRILLANT : http://www.japisoft.com
  // All this work is confidential, you have rights to
  // change and evolve it for your products but you
  // have no rights to sell it, propose concurrent works.
  // Morever any changes to bugs or evolutions should
  // be send to JAPISOFT that needs to maintain a
  // valid version and has all rights on the product.
  
  package com.japisoft.xpath.function.basic;
  
  import com.japisoft.xpath.function.*;
  import com.japisoft.xpath.XPathContext;
  import com.japisoft.xpath.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 final class SubString extends AbstractFunction {
  	public SubString() {
  		super();
  	}
  
  	public Object eval(XPathContext context, FastVector arg) {
  		int narg = arg.size();
  		if (narg < 2) {
  			throw new RuntimeException("Invalid parameters in " + this);
  		} else {
  			java.lang.String s = null;
  			double p1 = 0;
  			double p2 = 0;
  
  			try {
  				if (narg == 2) {
  					s = (java.lang.String) arg.elementAt(1);
  					p1 = ((Double) arg.elementAt(0)).doubleValue();
  				} else if (narg == 3) {
  					s = (java.lang.String) arg.elementAt(2);
  					p1 = ((Double) arg.elementAt(1)).doubleValue();
  					p2 = ((Double) arg.elementAt(0)).doubleValue();
  				} else {
  					return "";
  				}
  
  				try {
  
  					if ( p1 <= 0 ) {
  						p2 -= ( 1 - p1 );
  						p1 = 1; 
  					}
  
  					if ( Double.isInfinite( p2 ) ) {
  						p2 = s.length(); 
  					}
  
  					if (p2 == 0.0)
  						return s.substring((int) Math.ceil(p1) - 1);
  					else
  						return s.substring((int) Math.ceil(p1) - 1, (int) Math
  								.ceil(p1 + p2) - 1);
  
  				} catch (IndexOutOfBoundsException exc) {
  					return "";
  				}
  
  			} catch (ClassCastException exc) {
  				throw new RuntimeException(
  						"Invalid parameter usage for the substring function");
  			}
  		}
  	}
  }
  // Contains ends here
  