Revision 22512 trunk/extensions/extSymbology/src/org/gvsig/symbology/fmap/rendering/filter/operations/IsNullOperator.java

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IsNullOperator.java
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import com.hardcode.gdbms.engine.values.Value;
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import com.iver.cit.gvsig.fmap.Messages;
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/**
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 *
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 * Implements the funcionality of the IsNull operator which can be
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 *
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 * Implements the funcionality of the IsNull operator which can be
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 * used in a Filter Encoding expression
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 *
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 *
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 * @author Pepe Vidal Salvador - jose.vidal.salvador@iver.es
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 *
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 */
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public class IsNullOperator implements Expression {
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public class IsNullOperator extends Operator {
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	private ArrayList<Expression> arguments = new ArrayList<Expression>();


  		




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	public String getName() {


  		




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		return OperationTags.ISNULL_OP;


  		




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	}


  		




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	public IsNullOperator(Hashtable<String, Value> symbol_table) {


  		




  
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		super(symbol_table);


  		




  
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	}


  		




  
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	public void addArgument(int i, Expression arg) {


  		




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		arguments.add(i, arg);


  		




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	}


  		




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	public Object evaluate(Hashtable<String, Value> symbol_table)throws ExpressionException {


  		




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	public Object evaluate()throws ExpressionException {


  		




  
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		if(arguments.size() > 1)


  		




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			throw new ExpressionException(ExpressionException.INCORRECT_NUMBER_OF_ARGUMENTS);


  		




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		else if(arguments.get(0)== null)


  		




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			return true;


  		




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		return false;


  		




  ......




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		return OperationTags.ISNULL_OP+"("


  		




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		+ Messages.getString(OperationTags.OPERAND) +")\n"+


  		




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		Messages.getString(OperationTags.OPERAND) +" = "+


  		




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		Messages.getString(OperationTags.NUMERIC_OR_BOOLEAN_CONSTANT);	


  		




  
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		Messages.getString(OperationTags.NUMERIC_OR_BOOLEAN_CONSTANT);


  		




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	}


  		




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	public ArrayList<Expression> getArguments() {


  		




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		this.arguments = arguments;


  		




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	}


  		




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	public void check(Hashtable<String, Value> symbol_table) throws ExpressionException {


  		




  
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	public void check() throws ExpressionException {


  		




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		if(arguments.size() != 1)


  		




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			throw new ExpressionException(ExpressionException.INCORRECT_NUMBER_OF_ARGUMENTS);


  		




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	}


  		












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