Rename TldSpecificLogicEngine to TldSpecificLogicProxy

This new name is a more accurate description of what the actual class
does.  TldSpecificLogicEngine is an interface that will be added in
the near future, implementations of which will provide custom per-TLD
logic.  The class being renamed is more properly a proxy that only
handles logic generic to all TLDs.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=127088913

java/google/registry/pricing/TldSpecificLogicProxy.java

@@ -0,0 +1,151 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.pricing;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkState;
+import static google.registry.pricing.PricingEngineProxy.getPricesForDomainName;
+import static google.registry.util.PreconditionsUtils.checkArgumentNotNull;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.ImmutableList;
+
+import google.registry.model.ImmutableObject;
+import google.registry.model.domain.fee.EapFee;
+import google.registry.model.domain.fee.Fee;
+import google.registry.model.pricing.PremiumPricingEngine.DomainPrices;
+import google.registry.model.registry.Registry;
+
+import org.joda.money.CurrencyUnit;
+import org.joda.money.Money;
+import org.joda.time.DateTime;
+
+/**
+ * Provides pricing, billing, and update logic, with call-outs that can be customized by providing
+ * implementations on a per-TLD basis.
+ */
+public final class TldSpecificLogicProxy {
+
+  private static final String EAP_DESCRIPTION_FORMAT = "Early Access Period, fee expires: %s";
+
+  /**
+   * A collection of fees for a specific event.
+   */
+  public static final class EppCommandOperations extends ImmutableObject {
+    private final CurrencyUnit currency;
+    private final ImmutableList<Fee> fees;
+
+    EppCommandOperations(CurrencyUnit currency, ImmutableList<Fee> fees) {
+      this.currency = checkArgumentNotNull(
+          currency, "Currency may not be null in EppCommandOperations.");
+      checkArgument(!fees.isEmpty(), "You must specify one or more fees.");
+      this.fees = checkArgumentNotNull(fees, "Fees may not be null in EppCommandOperations.");
+    }
+
+    /**
+     * Returns the total cost of all fees for the event.
+     */
+    public Money getTotalCost() {
+      Money result = Money.of(currency, 0);
+      for (Fee fee : fees) {
+        result = result.plus(fee.getCost());
+      }
+      return result;
+    }
+
+    /**
+     * Returns all costs for the event as a list of fees.
+     */
+    public ImmutableList<Fee> getFees() {
+      return fees;
+    }
+
+    /**
+     * Returns the currency for all fees in the event.
+     */
+    public final CurrencyUnit getCurrency() {
+      return currency;
+    }
+  }
+
+  private TldSpecificLogicProxy() {}
+
+  /**
+   * Returns a new "create" price for the Pricer.
+   */
+  public static EppCommandOperations getCreatePrice(
+      Registry registry, String domainName, DateTime date, int years) {
+    DomainPrices prices = getPricesForDomainName(domainName, date);
+    CurrencyUnit currency = registry.getCurrency();
+    ImmutableList.Builder<Fee> feeBuilder = new ImmutableList.Builder<>();
+
+    // Add Create cost.
+    feeBuilder.add(Fee.create(prices.getCreateCost().multipliedBy(years).getAmount(), "create"));
+
+    // Add EAP Fee.
+    EapFee eapFee = registry.getEapFeeFor(date);
+    Money eapFeeCost = eapFee.getCost();
+    checkState(eapFeeCost.getCurrencyUnit().equals(currency));
+    if (!eapFeeCost.getAmount().equals(Money.zero(currency).getAmount())) {
+      feeBuilder.add(
+          Fee.create(
+              eapFeeCost.getAmount(),
+              String.format(EAP_DESCRIPTION_FORMAT, eapFee.getPeriod().upperEndpoint())));
+    }
+
+    return new EppCommandOperations(currency, feeBuilder.build());
+  }
+
+  /**
+   * Returns a new renew price for the pricer.
+   */
+  public static EppCommandOperations getRenewPrice(
+      Registry registry, String domainName, DateTime date, int years) {
+    DomainPrices prices = getPricesForDomainName(domainName, date);
+    return new EppCommandOperations(
+        registry.getCurrency(),
+        ImmutableList.of(
+            Fee.create(prices.getRenewCost().multipliedBy(years).getAmount(), "renew")));
+  }
+
+  /**
+   * Returns a new restore price for the pricer.
+   */
+  public static EppCommandOperations getRestorePrice(
+      Registry registry, String domainName, DateTime date, int years) {
+    DomainPrices prices = getPricesForDomainName(domainName, date);
+    return new EppCommandOperations(
+        registry.getCurrency(),
+        ImmutableList.of(
+            Fee.create(prices.getRenewCost().multipliedBy(years).getAmount(), "renew"),
+            Fee.create(registry.getStandardRestoreCost().getAmount(), "restore")));
+  }
+
+  /**
+   * Returns a new transfer price for the pricer.
+   */
+  public static EppCommandOperations getTransferPrice(
+      Registry registry, String domainName, DateTime transferDate, int additionalYears) {
+    // Currently, all transfer prices = renew prices, so just pass through.
+    return getRenewPrice(registry, domainName, transferDate, additionalYears);
+  }
+
+  /**
+   * Returns the fee class for a given domain and date.
+   */
+  public static Optional<String> getFeeClass(String domainName, DateTime date) {
+    return getPricesForDomainName(domainName, date).getFeeClass();
+  }
+}