source: java2python/geniuswebtranslator/geniuswebsrc/geniusweb/profile/DefaultPartialOrdering.java@ 605

package geniusweb.profile;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.KeyDeserializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import geniusweb.issuevalue.Bid;
import geniusweb.issuevalue.Domain;

/**
 * Strange that we need to do this. Bid is completely standard. The complication
 * that this solves is that the keys are places as STRING in the json code
 * because json allows only strings as key.
 */
@SuppressWarnings("serial")
class BidDeserializer extends KeyDeserializer {
        private ObjectMapper jackson = new ObjectMapper();

        @Override
        public Bid deserializeKey(String key, DeserializationContext ctxt)
                        throws IOException {
                return jackson.readValue(key, Bid.class);
        }

}

/**
 * Serializes a Bid to string. Unfortunately by default jackson uses
 * key.toString() for serializing (rather than
 * {@link ObjectMapper#writeValueAsString(Object)}).
 *
 */
class BidSerializer extends JsonSerializer<Bid> {
        private ObjectMapper jackson = new ObjectMapper();

        @Override
        public void serialize(Bid bid, JsonGenerator gen,
                        SerializerProvider serializers) throws IOException {
                gen.writeFieldName(jackson.writeValueAsString(bid));
        }

}

/**
 * Default implementation of partial ordering that stores all is-better
 * relations explicitly in a map.
 * 
 * NOTICE this can handle profiles of max size Integer. This is because various
 * functions used here rely on basic java functions that can handle only int.
 * Besides, the size of partial maps grows very rapidly so this approach is
 * limited anyway.
 */
@JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, setterVisibility = Visibility.NONE, isGetterVisibility = Visibility.NONE)
public class DefaultPartialOrdering extends DefaultProfile
                implements PartialOrdering {

        /**
         * Set is sparsely filled. If a Bid is not a key, it is not better than any
         * other bid.
         */
        //#PY # not needed in pyson, has fallback for key (de)serialization 
        @JsonDeserialize(keyUsing = BidDeserializer.class)
        //#PY # not needed in pyson, has fallback for key (de)serialization 
        @JsonSerialize(keyUsing = BidSerializer.class)
        private final Map<Bid, Set<Bid>> better;

        /**
         * @param name           the name for the profile
         * @param domain         the {@link Domain} description
         * @param reservationbid the reservation {@link Bid}
         * @param better         a map with keys = a better bid and value=a less
         *                       good bid.
         */
        @JsonCreator
        public DefaultPartialOrdering(@JsonProperty("name") String name,
                        @JsonProperty("domain") Domain domain,
                        @JsonProperty("reservationBid") Bid reservationbid,
                        @JsonProperty("better") Map<Bid, Set<Bid>> better) {
                super(name, domain, reservationbid);
                this.better = better;
        }

        @Override
        public boolean isPreferredOrEqual(Bid bid1, Bid bid2) {
                if (!better.containsKey(bid1))
                        return false;
                return better.get(bid1).contains(bid2);
        }

        /**
         * 
         * @return a list with all the bids that are referred to, either as better
         *         or as worse than another bid
         */
        public List<Bid> getBids() {
                // FIXME the iteration order may not be guaranteed!
                Set<Bid> bids = new HashSet<>();
                for (Bid bid : better.keySet()) {
                        bids.add(bid);
                        bids.addAll(better.get(bid));
                }
                return new ArrayList<Bid>(bids);
        }

        /**
         * 
         * @return a list of tuples [bid1index, bid2index]. It indicates that
         *         bids[bid1index] isbetterthan bids[bid2index].
         */
        public List<List<Integer>> getBetter() {
                List<List<Integer>> betterlist = new LinkedList<>();
                List<Bid> bidslist = getBids();

                for (Bid bid : bidslist) {
                        if (better.containsKey(bid)) {
                                for (Bid worsebid : better.get(bid)) {
                                        betterlist.add(Arrays.asList(bidslist.indexOf(bid),
                                                        bidslist.indexOf(worsebid)));
                                }
                        }
                }

                return betterlist;
        }

        @Override
        public String toString() {
                return "DefaultPartialOrdering[" + getValuesString() + "," + better
                                + "]";
        }

        @Override
        public int hashCode() {
                final int prime = 31;
                int result = super.hashCode();
                result = prime * result + ((better == null) ? 0 : better.hashCode());
                return result;
        }

        @Override
        public boolean equals(Object obj) {
                if (this == obj)
                        return true;
                if (!super.equals(obj))
                        return false;
                if (getClass() != obj.getClass())
                        return false;
                DefaultPartialOrdering other = (DefaultPartialOrdering) obj;
                if (better == null) {
                        if (other.better != null)
                                return false;
                } else if (!better.equals(other.better))
                        return false;
                return true;
        }

}