StockPriceCalculator.java

package org.jetbrains.mps.samples.money.runtime;

/*Generated by MPS */

import java.math.BigDecimal;
import java.util.List;
import jetbrains.mps.internal.collections.runtime.ListSequence;
import jetbrains.mps.internal.collections.runtime.ISelector;
import jetbrains.mps.internal.collections.runtime.ILeftCombinator;

public final class StockPriceCalculator {
  public static Iterable<BigDecimal> calculateMovingAverage(List<DailyStockPrice> prices) {
    List<DailyStockPrice> pricesToUse = retrievePricesWithin(prices);
    BigDecimal sum = ListSequence.fromList(pricesToUse).select(new ISelector<DailyStockPrice, BigDecimal>() {
      public BigDecimal select(DailyStockPrice it) {
        return it.getAdjustedClose();
      }
    }).reduceLeft(new ILeftCombinator<BigDecimal, BigDecimal>() {
      public BigDecimal combine(BigDecimal a, BigDecimal b) {
        return a.add(b);
      }
    });
    BigDecimal divided = sum.divide(BigDecimal.valueOf(ListSequence.fromList(pricesToUse).count()));
    return null;

  }

  private static List<DailyStockPrice> retrievePricesWithin(List<DailyStockPrice> prices) {
    return ListSequence.fromList(prices).subListSequence(0, 10);
  }
}