source: trunk/CrossPare/decent/epsilon/libraries/arff/common.eol

operation ARFFx!Instance addValue(content : String, attribute : String) {
        var value = new ARFFx!Value();
        value.ofAttribute = attribute.getARFFAttribute(self.eContainer());
        value.content = content;
        self.values.add(value);         
}


operation ARFFx!Instance updateValue(content : String, attribute : String) {
        var value = self.values.select(v|v.ofAttribute.name = attribute).first();
        if (value.isUndefined()) {
                value = new ARFFx!Value();
                value.ofAttribute = attribute.getARFFAttribute(self.eContainer());
                self.values.add(value);         
        }
        value.content = content;
}


@cached
operation String getARFFAttribute(arffx : ARFFx!Model) : ARFFx!Attribute {
        var attribute = arffx.attributes.select(a|a.name = self).first();
        if (attribute.isUndefined()) {
                attribute = new ARFFx!Attribute();
                attribute.name = self;
                arffx.attributes.add(attribute);
        }
        return attribute;
}

operation String getSelectedAttributes() : Sequence {
        var file = new Native("java.io.File")(self);
        var content = new Native("org.apache.commons.io.FileUtils").readLines(file);
        
        
        content = content.select(x|not x.startsWith("#")).closure(x|x.trim());
        return content;
}

@cached
operation ARFFx!Instance getValue(attribute : ARFFx!Attribute) : String {
        return self.values.select(v|v.ofAttribute = attribute).first().content;
}