Support XRPFees amendment

xrpl4j-core/src/main/java/org/xrpl/xrpl4j/model/client/ledger/LedgerEntryResult.java

@@ -26,6 +26,8 @@ public interface LedgerEntryResult<T extends LedgerObject> extends XrplResult {
   /**
    * Construct a {@code LedgerEntryResult} builder.
    *
+   * @param <T> The type of {@link LedgerObject}.
+   *
    * @return An {@link ImmutableLedgerEntryResult.Builder}.
    */
   static <T extends LedgerObject> ImmutableLedgerEntryResult.Builder<T> builder() {

xrpl4j-core/src/main/java/org/xrpl/xrpl4j/model/jackson/modules/BaseFeeDropsDeserializer.java

@@ -0,0 +1,61 @@
+package org.xrpl.xrpl4j.model.jackson.modules;
+
+/*-
+ * ========================LICENSE_START=================================
+ * xrpl4j :: model
+ * %%
+ * Copyright (C) 2020 - 2022 XRPL Foundation and its contributors
+ * %%
+ * 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.
+ * =========================LICENSE_END==================================
+ */
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
+import com.google.common.primitives.UnsignedLong;
+import org.xrpl.xrpl4j.model.transactions.SetFee;
+import org.xrpl.xrpl4j.model.transactions.XrpCurrencyAmount;
+
+import java.io.IOException;
+
+/**
+ * Custom Jackson deserializer for {@link XrpCurrencyAmount} instances found in {@link SetFee}.
+ *
+ * <p>Before the <a href="https://xrpl.org/resources/known-amendments/#xrpfees">XRPFees amendment</a>, a {@link SetFee}
+ * transaction serializes its `BaseFee` to a hex string. After the
+ * <a href="https://xrpl.org/resources/known-amendments/#xrpfees">XRPFees amendment</a>, a {@link SetFee} transaction
+ * serializes its `BaseFee` to a decimal string.
+ *
+ * @see "https://xrpl.org/resources/known-amendments/#xrpfees"
+ */
+public class BaseFeeDropsDeserializer extends StdDeserializer<XrpCurrencyAmount> {
+
+  /**
+   * No-args constructor.
+   */
+  public BaseFeeDropsDeserializer() {
+    super(XrpCurrencyAmount.class);
+  }
+
+  @Override
+  public XrpCurrencyAmount deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException {
+    // Pre-XRPFees, SetFee transactions serialize `BaseFee` to a hex string. Post XRPFees SetFee transactions
+    // have a `BaseFeeDrops` field which is a decimal string.
+    if (jsonParser.currentName().equals("BaseFee")) {
+      return XrpCurrencyAmount.of(UnsignedLong.valueOf(jsonParser.getText(), 16));
+    } else {
+      return XrpCurrencyAmount.ofDrops(jsonParser.getValueAsLong());
+    }
+  }
+}

xrpl4j-core/src/main/java/org/xrpl/xrpl4j/model/transactions/SetFee.java

@@ -9,9 +9,9 @@
  * 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.
@@ -20,12 +20,15 @@
  * =========================LICENSE_END==================================
  */
 
+import com.fasterxml.jackson.annotation.JsonAlias;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 import com.google.common.primitives.UnsignedInteger;
 import org.immutables.value.Value;
 import org.xrpl.xrpl4j.model.client.common.LedgerIndex;
+import org.xrpl.xrpl4j.model.jackson.modules.BaseFeeDropsDeserializer;
 
 import java.util.Optional;
 
@@ -53,34 +56,92 @@ static ImmutableSetFee.Builder builder() {
    * The charge, in drops of XRP, for the reference transaction, as hex. (This is the transaction cost before scaling
    * for load.)
    *
-   * @return A hex {@link String} basefee value.
+   * <p>This method only exists for historical purposes. When deserialized from a {@link SetFee} transaction from
+   * ledgers prior to the {@code XRPFees} amendment, this field will still be set based on {@link #baseFeeDrops()}.
+   *
+   * @return A hex {@link String} baseFee value.
+   */
+  @Value.Derived
+  @JsonIgnore
+  default String baseFee() {
+    return baseFeeDrops().value().toString(16);
+  }
+
+  /**
+   * The charge, in drops of XRP, for the reference transaction (This is the transaction cost before scaling for load).
+   *
+   * <p>This field will also be populated with the {@code BaseFee} value from any {@link SetFee} transactions
+   * that occurred before the XRPFees amendment took effect.</p>
+   *
+   * @return An {@link XrpCurrencyAmount}.
    */
-  @JsonProperty("BaseFee")
-  String baseFee();
+  @JsonProperty("BaseFeeDrops")
+  @JsonAlias("BaseFee")
+  @JsonDeserialize(using = BaseFeeDropsDeserializer.class)
+  XrpCurrencyAmount baseFeeDrops();
 
   /**
-   * The cost, in fee units, of the reference transaction.
+   * The cost, in fee units, of the reference transaction. {@link SetFee} transactions deserialized from ledgers prior
+   * to the {@code XRPFees} amendment will always have this field, but transactions deserialized from ledgers post
+   * {@code XRPFees} activation will never have this field.
    *
    * @return An {@link UnsignedInteger} cost of ref transaction.
    */
   @JsonProperty("ReferenceFeeUnits")
-  UnsignedInteger referenceFeeUnits();
+  Optional<UnsignedInteger> referenceFeeUnits();
 
   /**
    * The base reserve, in drops.
    *
-   * @return An {@link UnsignedInteger} base reverse value in {@link org.xrpl.xrpl4j.model.client.fees.FeeDrops}.
+   * <p>This method only exists for historical purposes. When deserialized from a {@link SetFee} transaction from
+   * ledgers prior to the {@code XRPFees} amendment, this field will still be set based on {@link #reserveBaseDrops()}}.
+   *
+   * @return An {@link UnsignedInteger} base reserve value in {@link org.xrpl.xrpl4j.model.client.fees.FeeDrops}.
    */
-  @JsonProperty("ReserveBase")
-  UnsignedInteger reserveBase();
+  @Value.Derived
+  @JsonIgnore
+  default UnsignedInteger reserveBase() {
+    return UnsignedInteger.valueOf(reserveBaseDrops().value().longValue());
+  }
+
+  /**
+   * The base reserve, as an {@link XrpCurrencyAmount}.
+   *
+   * <p>This field will also be populated with the {@code ReserveBase} value from any {@link SetFee} transactions
+   * that occurred before the XRPFees amendment took effect.</p>
+   *
+   * @return An {@link XrpCurrencyAmount}.
+   */
+  @JsonProperty("ReserveBaseDrops")
+  @JsonAlias("ReserveBase")
+  XrpCurrencyAmount reserveBaseDrops();
 
   /**
    * The incremental reserve, in drops.
    *
+   * <p>This method only exists for historical purposes. When deserialized from a {@link SetFee} transaction from
+   * ledgers prior to the {@code XRPFees} amendment, this field will still be set based on
+   * {@link #reserveIncrementDrops()}.
+   *
    * @return An {@link UnsignedInteger} incremental reserve in {@link org.xrpl.xrpl4j.model.client.fees.FeeDrops}.
    */
-  @JsonProperty("ReserveIncrement")
-  UnsignedInteger reserveIncrement();
+  @Value.Derived
+  @JsonIgnore
+  default UnsignedInteger reserveIncrement() {
+    return UnsignedInteger.valueOf(reserveIncrementDrops().value().longValue());
+  }
+
+  /**
+   * The incremental reserve, as an {@link XrpCurrencyAmount}.
+   *
+   * <p>This field will also be populated with the {@code ReserveIncrement} value from any {@link SetFee} transactions
+   * that occurred before the XRPFees amendment took effect.</p>
+   *
+   * @return An {@link XrpCurrencyAmount}.
+   */
+  @JsonProperty("ReserveIncrementDrops")
+  @JsonAlias("ReserveIncrement")
+  XrpCurrencyAmount reserveIncrementDrops();
 
   /**
    * The index of the ledger version where this pseudo-transaction appears. This distinguishes the pseudo-transaction

xrpl4j-core/src/test/java/org/xrpl/xrpl4j/model/transactions/SetFeeTest.java

@@ -22,25 +22,57 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+import com.fasterxml.jackson.core.JsonProcessingException;
 import com.google.common.primitives.UnsignedInteger;
 import com.google.common.primitives.UnsignedLong;
+import org.json.JSONException;
 import org.junit.jupiter.api.Test;
+import org.xrpl.xrpl4j.model.AbstractJsonTest;
 import org.xrpl.xrpl4j.model.client.common.LedgerIndex;
 
 import java.util.Optional;
 
-public class SetFeeTest {
+/**
+ * Unit tests for {@link SetFee}.
+ */
+public class SetFeeTest extends AbstractJsonTest {
+
+  @Test
+  public void testConstructWithNoFeeUnits() {
+    SetFee setFee = SetFee.builder()
+      .account(Address.of("rrrrrrrrrrrrrrrrrrrrrhoLvTp"))
+      .fee(XrpCurrencyAmount.ofDrops(12))
+      .sequence(UnsignedInteger.valueOf(2470665))
+      .baseFeeDrops(XrpCurrencyAmount.ofDrops(10))
+      .reserveBaseDrops(XrpCurrencyAmount.ofDrops(20000000))
+      .reserveIncrementDrops(XrpCurrencyAmount.ofDrops(5000000))
+      .ledgerSequence(Optional.of(LedgerIndex.of(UnsignedInteger.valueOf(67850752))))
+      .build();
+
+    assertThat(setFee.transactionType()).isEqualTo(TransactionType.SET_FEE);
+    assertThat(setFee.account()).isEqualTo(Address.of("rrrrrrrrrrrrrrrrrrrrrhoLvTp"));
+    assertThat(setFee.fee().value()).isEqualTo(UnsignedLong.valueOf(12));
+    assertThat(setFee.sequence()).isEqualTo(UnsignedInteger.valueOf(2470665));
+    assertThat(setFee.ledgerSequence()).isNotEmpty().get().isEqualTo(LedgerIndex.of(UnsignedInteger.valueOf(67850752)));
+    assertThat(setFee.baseFee()).isEqualTo("a");
+    assertThat(setFee.baseFeeDrops()).isEqualTo(XrpCurrencyAmount.ofDrops(10));
+    assertThat(setFee.referenceFeeUnits()).isEmpty();
+    assertThat(setFee.reserveIncrement()).isEqualTo(UnsignedInteger.valueOf(5000000));
+    assertThat(setFee.reserveIncrementDrops()).isEqualTo(XrpCurrencyAmount.ofDrops(5000000));
+    assertThat(setFee.reserveBase()).isEqualTo(UnsignedInteger.valueOf(20000000));
+    assertThat(setFee.reserveBaseDrops()).isEqualTo(XrpCurrencyAmount.ofDrops(20000000));
+  }
 
   @Test
-  public void testBuilder() {
+  public void testConstructWithFeeUnits() {
     SetFee setFee = SetFee.builder()
       .account(Address.of("rrrrrrrrrrrrrrrrrrrrrhoLvTp"))
       .fee(XrpCurrencyAmount.ofDrops(12))
       .sequence(UnsignedInteger.valueOf(2470665))
-      .baseFee("000000000000000A")
+      .baseFeeDrops(XrpCurrencyAmount.ofDrops(10))
+      .reserveBaseDrops(XrpCurrencyAmount.ofDrops(20000000))
+      .reserveIncrementDrops(XrpCurrencyAmount.ofDrops(5000000))
       .referenceFeeUnits(UnsignedInteger.valueOf(10))
-      .reserveBase(UnsignedInteger.valueOf(20000000))
-      .reserveIncrement(UnsignedInteger.valueOf(5000000))
       .ledgerSequence(Optional.of(LedgerIndex.of(UnsignedInteger.valueOf(67850752))))
       .build();
 
@@ -49,8 +81,78 @@ public void testBuilder() {
     assertThat(setFee.fee().value()).isEqualTo(UnsignedLong.valueOf(12));
     assertThat(setFee.sequence()).isEqualTo(UnsignedInteger.valueOf(2470665));
     assertThat(setFee.ledgerSequence()).isNotEmpty().get().isEqualTo(LedgerIndex.of(UnsignedInteger.valueOf(67850752)));
-    assertThat(setFee.referenceFeeUnits()).isEqualTo(UnsignedInteger.valueOf(10));
+    assertThat(setFee.baseFee()).isEqualTo("a");
+    assertThat(setFee.baseFeeDrops()).isEqualTo(XrpCurrencyAmount.ofDrops(10));
+    assertThat(setFee.referenceFeeUnits()).isNotEmpty().get().isEqualTo(UnsignedInteger.valueOf(10));
     assertThat(setFee.reserveIncrement()).isEqualTo(UnsignedInteger.valueOf(5000000));
+    assertThat(setFee.reserveIncrementDrops()).isEqualTo(XrpCurrencyAmount.ofDrops(5000000));
     assertThat(setFee.reserveBase()).isEqualTo(UnsignedInteger.valueOf(20000000));
+    assertThat(setFee.reserveBaseDrops()).isEqualTo(XrpCurrencyAmount.ofDrops(20000000));
+  }
+
+  @Test
+  public void testDeserializePreXrpFeesTransaction() throws JsonProcessingException {
+    SetFee expected = SetFee.builder()
+      .account(Address.of("rrrrrrrrrrrrrrrrrrrrrhoLvTp"))
+      .fee(XrpCurrencyAmount.ofDrops(12))
+      .sequence(UnsignedInteger.valueOf(2470665))
+      .baseFeeDrops(XrpCurrencyAmount.ofDrops(10))
+      .referenceFeeUnits(UnsignedInteger.valueOf(10))
+      .reserveBaseDrops(XrpCurrencyAmount.ofDrops(20000000))
+      .reserveIncrementDrops(XrpCurrencyAmount.ofDrops(5000000))
+      .ledgerSequence(Optional.of(LedgerIndex.of(UnsignedInteger.valueOf(67850752))))
+      .build();
+
+    String json = "{" +
+      "\"Account\":\"rrrrrrrrrrrrrrrrrrrrrhoLvTp\"," +
+      "\"Fee\":\"12\"," +
+      "\"LedgerSequence\":67850752," +
+      "\"Sequence\":2470665," +
+      "\"SigningPubKey\":\"\"," +
+      "\"TransactionType\":\"SetFee\"," +
+      "\"ReserveIncrement\":5000000," +
+      "\"ReserveBase\":20000000," +
+      "\"ReferenceFeeUnits\":10," +
+      "\"BaseFee\":\"a\"}";
+
+    Transaction actual = objectMapper.readValue(json, Transaction.class);
+    assertThat(actual).isEqualTo(expected);
+
+    String reserialized = objectMapper.writeValueAsString(actual);
+    Transaction redeserialized = objectMapper.readValue(reserialized, Transaction.class);
+
+    assertThat(redeserialized).isEqualTo(expected);
+  }
+
+  @Test
+  public void testDeserializePostXrpFeesTransaction() throws JsonProcessingException {
+    SetFee expected = SetFee.builder()
+      .account(Address.of("rrrrrrrrrrrrrrrrrrrrrhoLvTp"))
+      .fee(XrpCurrencyAmount.ofDrops(0))
+      .sequence(UnsignedInteger.valueOf(0))
+      .baseFeeDrops(XrpCurrencyAmount.ofDrops(10))
+      .reserveBaseDrops(XrpCurrencyAmount.ofDrops(10000000))
+      .reserveIncrementDrops(XrpCurrencyAmount.ofDrops(2000000))
+      .ledgerSequence(Optional.of(LedgerIndex.of(UnsignedInteger.valueOf(66462465))))
+      .build();
+
+    String json = "{\n" +
+      "    \"Account\": \"rrrrrrrrrrrrrrrrrrrrrhoLvTp\",\n" +
+      "    \"BaseFeeDrops\": \"10\",\n" +
+      "    \"Fee\": \"0\",\n" +
+      "    \"LedgerSequence\": 66462465,\n" +
+      "    \"ReserveBaseDrops\": \"10000000\",\n" +
+      "    \"ReserveIncrementDrops\": \"2000000\",\n" +
+      "    \"Sequence\": 0,\n" +
+      "    \"SigningPubKey\": \"\",\n" +
+      "    \"TransactionType\": \"SetFee\"}";
+
+    Transaction actual = objectMapper.readValue(json, Transaction.class);
+    assertThat(actual).isEqualTo(expected);
+
+    String reserialized = objectMapper.writeValueAsString(actual);
+    Transaction redeserialized = objectMapper.readValue(reserialized, Transaction.class);
+
+    assertThat(redeserialized).isEqualTo(expected);
   }
 }