/**
*
*/
package org.javacommerce.google.handler.impl;
import java.math.BigDecimal;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.javacommerce.core.config.JavaCommerce;
import org.javacommerce.google.handler.CalculationException;
import org.javacommerce.google.handler.CalculationHandler;
import com.google.checkout.AnonymousAddress;
import com.google.checkout.Item;
import com.google.checkout.Items;
import com.google.checkout.MerchantCalculationCallback;
import com.google.checkout.MerchantCalculationResults;
import com.google.checkout.Method;
import com.google.checkout.Result;
import com.google.checkout.Results;
import com.google.checkout.ShippingRate;
import com.google.checkout.TotalTax;
/**
* Default MerchantCalculcationCallback Handler. Only supports tax and shipping calculcations
* based on a configuration file. If no values are present in the configuration, 0's are used.
* @author Michael Blanton (mike@mikeblanton.com)
*/
public class DefaultMerchantCalculationCallbackHandler implements CalculationHandler {
private static final Log LOG = LogFactory.getLog(DefaultMerchantCalculationCallbackHandler.class);
public static final String DEFAULT_CURRENCY = "USD";
public static final String CONFIG_GOOGLE_CALC = "google.calculation";
public static final String CONFIG_GOOGLE_CALC_TAX = new StringBuffer(CONFIG_GOOGLE_CALC).append(".tax").toString();
public static final String CONFIG_GOOGLE_CALC_TAX_DEFAULT = new StringBuffer(CONFIG_GOOGLE_CALC_TAX).append(".default").toString();
public static final BigDecimal DEFAULT_TAX = new BigDecimal("0.00");
public static final String CONFIG_GOOGLE_CALC_SHIPPING = new StringBuffer(CONFIG_GOOGLE_CALC).append(".shipping").toString();
public static final String CONFIG_GOOGLE_CALC_SHIPPING_DEFAULT = new StringBuffer(CONFIG_GOOGLE_CALC_SHIPPING).append(".default").toString();
public static final BigDecimal DEFAULT_SHIPPING = new BigDecimal("0.00");
public static final String DOT_DEFAULT = ".default";
public MerchantCalculationResults performCalculation(MerchantCalculationCallback _callback) throws CalculationException {
MerchantCalculationResults mcResults = new MerchantCalculationResults();
Results results = new Results();
mcResults.setResults(results);
boolean calcTax = _callback.getCalculate().getTax();
boolean calcShipping = false;
if (_callback.getCalculate().getShipping() != null) {
calcShipping = true;
}
BigDecimal orderTotal = calculateOrderTotal(_callback.getShoppingCart().getItems());
if (LOG.isDebugEnabled()) {
LOG.debug("Order Total is [" + orderTotal + "]");
}
BigDecimal defaultTax = JavaCommerce.getConfiguration().getBigDecimal(CONFIG_GOOGLE_CALC_TAX_DEFAULT, DEFAULT_TAX);
BigDecimal defaultShipping = JavaCommerce.getConfiguration().getBigDecimal(CONFIG_GOOGLE_CALC_SHIPPING_DEFAULT, DEFAULT_SHIPPING);
// Addresses is always passed according to the XSD.
for (int i = 0; i < _callback.getCalculate().getAddresses().getAnonymousAddressCount(); i++) {
AnonymousAddress address = _callback.getCalculate().getAddresses().getAnonymousAddress(i);
TotalTax totalTax = null;
if (calcTax) {
// Get the tax rate
BigDecimal taxRate = JavaCommerce.getConfiguration().getBigDecimal(new StringBuffer(CONFIG_GOOGLE_CALC_TAX).append(".").append(address.getRegion()).toString(), defaultTax);
// Calculate Tax
BigDecimal tax = taxRate.multiply(orderTotal);
tax = tax.setScale(2, BigDecimal.ROUND_UP);
if (LOG.isDebugEnabled()) {
LOG.debug("Calculated tax of [" + tax + "] with rate of [" + taxRate + "]");
}
totalTax = new TotalTax();
totalTax.setContent(tax);
totalTax.setCurrency(DEFAULT_CURRENCY);
}
if (calcShipping) {
for (int j = 0; j < _callback.getCalculate().getShipping().getMethodCount(); j++) {
Result result = new Result();
result.setAddressId(address.getId());
result.setShippable(true);
Method method = _callback.getCalculate().getShipping().getMethod(j);
result.setShippingName(method.getName());
// Load Shipping, read order:
// 1. google.calculation.shipping.{method name}.{address region}
// 2. google.calculation.shipping.{method name}.default
// 3. google.calculation.shipping.default
BigDecimal shipping = JavaCommerce.getConfiguration().getBigDecimal(new StringBuffer(CONFIG_GOOGLE_CALC_SHIPPING).append(".").append(method.getName()).append(".").append(address.getRegion()).toString(), JavaCommerce.getConfiguration().getBigDecimal(new StringBuffer(CONFIG_GOOGLE_CALC_SHIPPING).append(".").append(method.getName()).append(DOT_DEFAULT).toString(), defaultShipping));
shipping = shipping.setScale(2, BigDecimal.ROUND_UP);
if (LOG.isDebugEnabled()) {
LOG.debug("Calculated shipping of [" + shipping + "] for [" + method.getName() + "]");
}
ShippingRate rate = new ShippingRate();
rate.setContent(shipping);
rate.setCurrency(DEFAULT_CURRENCY);
result.setShippingRate(rate);
if (calcTax) {
result.setTotalTax(totalTax);
}
results.addResult(result);
}
}
else if (calcTax) {
Result result = new Result();
result.setAddressId(address.getId());
result.setTotalTax(totalTax);
results.addResult(result);
}
}
return mcResults;
}
private BigDecimal calculateOrderTotal(Items _items) {
BigDecimal total = new BigDecimal("0").setScale(2);
for (int i = 0; i < _items.getItemCount(); i++) {
Item item = _items.getItem(i);
total = total.add(item.getUnitPrice().getContent().multiply(new BigDecimal(item.getQuantity())));
}
total = total.setScale(2, BigDecimal.ROUND_UP);
return total;
}
}