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package org.gvsig.data.vectorial.filter;

import java.util.Map.Entry;

import org.gvsig.data.exception.ParseException;

import org.gvsig.data.exception.ReadException;

import org.gvsig.data.vectorial.IFeature;

import org.gvsig.data.vectorial.IFeatureType;

import org.medfoster.sqljep.BaseJEP;

public class FeatureFilterParser extends BaseJEP {

        private IFeatureType featureType;

        private IFeature feature;

        private boolean parsed = false;

        private String expresion;

        public FeatureFilterParser(String expression,IFeatureType featureType) {

                super(expression);

                this.expresion=expression;

                this.featureType = featureType;

        }

        public int findColumn(String fieldName) {

                return featureType.indexOf(fieldName);

        }

        public Comparable getColumnObject(int fieldPos){

                return (Comparable)this.feature.get(fieldPos);

        }

        public Entry getVariable(String arg0){

                return new FeatureEntry(arg0);

        }

        public boolean match(IFeature feature) throws ReadException{

                try{

                        this.feature = feature;

                        if (!parsed){

                                this.parseExpression();

                                parsed=true;

                        }

                        Comparable value = super.getValue();

                        return value.compareTo(Boolean.TRUE) == 0;

                } catch (org.medfoster.sqljep.ParseException e) {

                        throw new ParseException("FeatureFilterParser",this.expresion,e);

                }

        }

        private class FeatureEntry implements Entry{

                private String key;

                public FeatureEntry(String key){

                        this.key = key;

                }

                public Object getKey() {

                        return this.key;

                }

                public Object getValue() {

                        Object value =feature.get(this.key);

                        return value;

                }

                public Object setValue(Object arg0) {

                        return null;

                }

        }

}