Application: gvSIG desktop

    private boolean valid;

    private String errorMessage;

    private FilteredLogger logger;

    public DefaultFeatureAttributeEmulatorExpression() {

    public DefaultFeatureAttributeEmulatorExpression(FeatureType featureType, Expression expression) {

        this.expression = expression;

        this.checkVars(featureType);

    }

    private FilteredLogger getLogger() {

        this.requiredFields = theUsedFields.toArray(new String[theUsedFields.size()]);

    }

    @Override

    public SymbolTable getSymbolTable() {

        if (this.symbolTable == null) {

            Object result = this.expression.execute(this.getSymbolTable());

            return result;

        } catch(Exception ex) {

            this.getLogger().warn("Problems evaluating expression '"+this.expression.getPhrase()+"' with feature '"+feature.getReference().toString()+"'.", ex);

            return null;

        }