package org.cateproject.view.flow;
   
   import org.springframework.binding.convert.ConversionService;
   import org.springframework.binding.convert.service.GenericConversionService;
   import org.springframework.binding.expression.Expression;
   import org.springframework.binding.expression.ParserContext;
   import org.springframework.binding.expression.ParserException;
   import org.springframework.binding.expression.support.AbstractExpressionParser;
   
  public class BeanWrapperExpressionParser  extends AbstractExpressionParser {
  
  	private GenericConversionService conversionService;
  
  	/**
  	 * Creates a new expression parser that uses a {@link DefaultConversionService} to perform type conversion.
  	 */
  	public BeanWrapperExpressionParser() {
  		this.conversionService = new GenericConversionService();
  	}
  
  	/**
  	 * Creates a new expression parser that uses the specified conversion service for type conversion.
  	 * @param conversionService the conversion service to use
  	 */
  	public BeanWrapperExpressionParser(GenericConversionService conversionService) {
  		this.conversionService = conversionService;
  	}
  
  	/**
  	 * The conversion service to use to obtain {@link ConversionExecutor conversion executors} that will be adapted to
  	 * {@link PropertiesEditor property editors} for use during a
  	 * {@link BeanWrapperImpl#setPropertyValue(String, Object) set value} call. The default if not specified is an
  	 * instance of {@link DefaultConversionService}.
  	 */
  	public ConversionService getConversionService() {
  		return conversionService;
  	}
  
  	/**
  	 * Sets the conversion service to use to obtain {@link ConversionExecutor conversion executors} that will be adapted
  	 * to {@link PropertiesEditor property editors} for use during a
  	 * {@link BeanWrapperImpl#setPropertyValue(String, Object) set value} call.
  	 * @param conversionService the conversion service
  	 */
  	public void setConversionService(ConversionService conversionService) {
  		this.conversionService = (GenericConversionService) conversionService;
  	}
  
  	protected Expression doParseExpression(String expressionString, ParserContext context) throws ParserException {
  		return new BeanWrapperExpression(expressionString, conversionService);
  	}
  }