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package com.netflix.astyanax.entitystore;

import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.util.Iterator;
import java.util.Set;

import com.google.common.collect.Sets;
import com.netflix.astyanax.ColumnListMutation;
import com.netflix.astyanax.Serializer;
import com.netflix.astyanax.serializers.SerializerTypeInferer;

/**
 * 
 * .
 * @author elandau
 *
 */
public class SetColumnMapper extends AbstractColumnMapper {
    private final Class      clazz;
    private final Serializer serializer;

    public SetColumnMapper(Field field) {
        super(field);
        
        ParameterizedType stringListType = (ParameterizedType) field.getGenericType();
        this.clazz = (Class) stringListType.getActualTypeArguments()[0];
        this.serializer       = SerializerTypeInferer.getSerializer(this.clazz);
    }

    @Override
    public String getColumnName() {
        return this.columnName;
    }

    @Override
    public boolean fillMutationBatch(Object entity, ColumnListMutation clm, String prefix) throws Exception {
        Set set = (Set) field.get(entity);
        if(set == null) {
            if(columnAnnotation.nullable())
                return false; // skip
            else
                throw new IllegalArgumentException("cannot write non-nullable column with null value: " + columnName);
        }
        
        for (Object entry : set) {
            clm.putEmptyColumn(prefix + columnName + "." + entry.toString(), null);
        }
        return true;
    }
    
    @Override
    public boolean setField(Object entity, Iterator name, com.netflix.astyanax.model.Column column) throws Exception {
        Set