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package com.github.dockerjava.api.model;

import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.node.NullNode;

@JsonSerialize(using = Volumes.Serializer.class)
@JsonDeserialize(using = Volumes.Deserializer.class)
public class Volumes implements Serializable {
    private static final long serialVersionUID = 1L;

    private Volume[] volumes;

    public Volumes(Volume... volumes) {
        this.volumes = volumes;
    }

    public Volumes(List volumes) {
        this.volumes = volumes.toArray(new Volume[volumes.size()]);
    }

    public Volume[] getVolumes() {
        return volumes;
    }

    public static class Serializer extends JsonSerializer {

        @Override
        public void serialize(Volumes volumes, JsonGenerator jsonGen, SerializerProvider serProvider)
                throws IOException, JsonProcessingException {

            jsonGen.writeStartObject();
            for (Volume volume : volumes.getVolumes()) {
                jsonGen.writeFieldName(volume.getPath());
                jsonGen.writeStartObject();
                jsonGen.writeEndObject();
            }
            jsonGen.writeEndObject();
        }

    }

    public static class Deserializer extends JsonDeserializer {
        @Override
        public Volumes deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
                throws IOException, JsonProcessingException {

            List volumes = new ArrayList();
            ObjectCodec oc = jsonParser.getCodec();
            JsonNode node = oc.readTree(jsonParser);
            for (Iterator> it = node.fields(); it.hasNext();) {

                Map.Entry field = it.next();
                if (!field.getValue().equals(NullNode.getInstance())) {
                    String path = field.getKey();
                    Volume volume = new Volume(path);
                    volumes.add(volume);
                }
            }
            return new Volumes(volumes.toArray(new Volume[0]));
        }
    }

}