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package org.gvsig.fmap.dal.feature;

import java.util.ArrayList;

import java.util.Comparator;

import java.util.Iterator;

import java.util.List;

import org.gvsig.fmap.dal.feature.impl.DefaultFeatureComparator;

import org.gvsig.tools.evaluator.Evaluator;

public class FeatureQueryOrder {

        private List members = new ArrayList();

        public class FeatureQueryOrderMember {

                String attributeName = null;

                Evaluator evaluator = null;

                boolean ascending;

                FeatureQueryOrderMember(String attributeName, boolean ascending) {

                        this.attributeName = attributeName;

                        this.ascending = ascending;

                }

                FeatureQueryOrderMember(Evaluator evaluator, boolean ascending) {

                        this.evaluator = evaluator;

            this.ascending = ascending;

                }

                public boolean hasEvaluator() {

                        return this.evaluator != null;

                }

                public Evaluator getEvaluator() {

                        return this.evaluator;

                }

                public boolean getAscending() {

                        return this.ascending;

                }

                public String getAttributeName() {

                        return this.attributeName;

                }

        }

        public Object add(String attributeName, boolean ascending) {

        FeatureQueryOrderMember member = new FeatureQueryOrderMember(

                attributeName, ascending);

                if( members.add(member) ) {

                        return member;

                }

                return null;

        }

        public Object add(Evaluator evaluator, boolean ascending) {

                FeatureQueryOrderMember member = new FeatureQueryOrderMember(

                                evaluator,

                                ascending);

                if (members.add(member)) {

                        return member;

                }

                return null;

        }

        public Iterator iterator() {

                return members.iterator();

        }

        public boolean remove(FeatureQueryOrderMember member) {

                return members.remove(member);

        }

        public int size() {

                return this.members.size();

        }

        public Comparator getFeatureComparator() {

                return new DefaultFeatureComparator(this);

        }

}