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  package org.apache.cayenne.exp.parser;
  
  import org.apache.cayenne.exp.Expression;
  import org.apache.cayenne.util.ConversionUtil;
  
  /**
   * Bitwise negation (NOT i.e. inventor or '~') operation .
   * 
   * @since 3.1
   */
  public class ASTBitwiseNot extends EvaluatedNode {
  	private static final long serialVersionUID = 1L;
  
  	ASTBitwiseNot(int id) {
  		super(id);
  	}
  
  	public ASTBitwiseNot() {
  		super(ExpressionParserTreeConstants.JJTBITWISENOT);
  	}
  
  	public ASTBitwiseNot(Object node) {
          super(ExpressionParserTreeConstants.JJTBITWISENOT);
          jjtAddChild(wrapChild(node), 0);
          connectChildren();
  	}
  
  	@Override
  	protected Object evaluateSubNode(Object o, Object[] evaluatedChildren) throws Exception {
  		long value = ConversionUtil.toLong(o, Long.MIN_VALUE);
  		if (value == Long.MIN_VALUE) {
  			return null;
  		}
  		return ~value;
  	}
  
  	@Override
  	protected int getRequiredChildrenCount() {
  		return 1;
  	}
  
  	@Override
  	protected String getExpressionOperator(int index) {
  		return "~";
  	}
  	
  	@Override
  	public int getType() {
  		return Expression.BITWISE_NOT;
  	}
  
  	@Override
  	protected String getEJBQLExpressionOperator(int index) {
  		throw new UnsupportedOperationException(
  				"EJBQL 'bitwise not' is not supported");
  	}
  
  	@Override
  	public Expression shallowCopy() {
  		return new ASTBitwiseNot(id);
  	}
  }
  