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package br.com.anteros.nosql.persistence.mongodb.aggregation;

import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;

import java.util.ArrayList;
import java.util.List;


public class Accumulator implements AggregationElement {
    private final String operation;
    private final Object value;


    public Accumulator(final String operation, final String field) {
        this(operation, (Object) ("$" + field));
    }


    public Accumulator(final String operation, final Object field) {
        this.operation = operation;
        this.value = field;
    }


    public static Accumulator accumulator(final String operation, final String field) {
        return new Accumulator(operation, field);
    }


    public static Accumulator accumulator(final String operation, final Object field) {
        return new Accumulator(operation, field);
    }


    public String getOperation() {
        return operation;
    }

    public Object getValue() {
        return value;
    }

    @Override
    public DBObject toDBObject() {
        BasicDBObject dbObject = new BasicDBObject();
        if (value instanceof List) {
            List