feat: Implement NetworkRepository to interact with Mirror Node REST API

hedera-base/src/main/java/com/openelements/hedera/base/NetworkRepository.java

@@ -0,0 +1,46 @@
+package com.openelements.hedera.base;
+
+import com.openelements.hedera.base.mirrornode.ExchangeRates;
+import com.openelements.hedera.base.mirrornode.NetworkFee;
+import com.openelements.hedera.base.mirrornode.NetworkStake;
+import com.openelements.hedera.base.mirrornode.NetworkSupplies;
+
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Interface for interacting with a Hedera network. This interface provides methods to get information related to Network.
+ */
+public interface NetworkRepository {
+    /**
+     * Return the ExchangeRates for network.
+     *
+     * @return {@link Optional} containing the ExchangeRates or null
+     * @throws HederaException if the search fails
+     */
+    Optional<ExchangeRates> exchangeRates() throws HederaException;
+
+    /**
+     * Return the List of NetworkFee for network.
+     *
+     * @return {@link List} containing NetworkFee or empty list
+     * @throws HederaException if the search fails
+     */
+    List<NetworkFee> fees() throws HederaException;
+
+    /**
+     * Return the NetworkStake for network.
+     *
+     * @return {@link Optional} containing NetworkStake or null
+     * @throws HederaException if the search fails
+     */
+    Optional<NetworkStake> stake() throws HederaException;
+
+    /**
+     * Return the NetworkSupplies for network.
+     *
+     * @return {@link Optional} containing NetworkSupplies or null
+     * @throws HederaException if the search fails
+     */
+    Optional<NetworkSupplies> supplies() throws HederaException;
+}

hedera-base/src/main/java/com/openelements/hedera/base/implementation/NetworkRepositoryImpl.java

@@ -0,0 +1,42 @@
+package com.openelements.hedera.base.implementation;
+
+import com.openelements.hedera.base.HederaException;
+import com.openelements.hedera.base.NetworkRepository;
+import com.openelements.hedera.base.mirrornode.ExchangeRates;
+import com.openelements.hedera.base.mirrornode.MirrorNodeClient;
+import com.openelements.hedera.base.mirrornode.NetworkFee;
+import com.openelements.hedera.base.mirrornode.NetworkStake;
+import com.openelements.hedera.base.mirrornode.NetworkSupplies;
+import org.jspecify.annotations.NonNull;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+public class NetworkRepositoryImpl implements NetworkRepository {
+    private final MirrorNodeClient mirrorNodeClient;
+
+    public NetworkRepositoryImpl(@NonNull final MirrorNodeClient mirrorNodeClient) {
+        this.mirrorNodeClient = Objects.requireNonNull(mirrorNodeClient, "mirrorNodeClient must not be null");
+    }
+
+    @Override
+    public Optional<ExchangeRates> exchangeRates() throws HederaException {
+        return mirrorNodeClient.queryExchangeRates();
+    }
+
+    @Override
+    public List<NetworkFee> fees() throws HederaException {
+        return mirrorNodeClient.queryNetworkFees();
+    }
+
+    @Override
+    public Optional<NetworkStake> stake() throws HederaException {
+        return mirrorNodeClient.queryNetworkStake();
+    }
+
+    @Override
+    public Optional<NetworkSupplies> supplies() throws HederaException {
+        return mirrorNodeClient.queryNetworkSupplies();
+    }
+}

hedera-base/src/main/java/com/openelements/hedera/base/mirrornode/ExchangeRate.java

@@ -0,0 +1,12 @@
+package com.openelements.hedera.base.mirrornode;
+
+import org.jspecify.annotations.NonNull;
+
+import java.time.Instant;
+import java.util.Objects;
+
+public record ExchangeRate(int centEquivalent, int hbarEquivalent, @NonNull  Instant expirationTime) {
+    public ExchangeRate {
+        Objects.requireNonNull(expirationTime, "expirationTime must not be null");
+    }
+}

hedera-base/src/main/java/com/openelements/hedera/base/mirrornode/ExchangeRates.java

@@ -0,0 +1,12 @@
+package com.openelements.hedera.base.mirrornode;
+
+import org.jspecify.annotations.NonNull;
+
+import java.util.Objects;
+
+public record ExchangeRates(@NonNull  ExchangeRate currentRate, @NonNull  ExchangeRate nextRate) {
+    public ExchangeRates {
+        Objects.requireNonNull(currentRate, "currentRate must not be null");
+        Objects.requireNonNull(nextRate, "nextRate must not be null");
+    }
+}

hedera-base/src/main/java/com/openelements/hedera/base/mirrornode/MirrorNodeClient.java

@@ -1,5 +1,6 @@
 package com.openelements.hedera.base.mirrornode;
 
+import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
 
@@ -189,4 +190,40 @@ default Optional<AccountInfo> queryAccount(@NonNull String accountId) throws Hed
         Objects.requireNonNull(accountId, "accountId must not be null");
         return queryAccount(AccountId.fromString(accountId));
     }
+
+    /**
+     * Queries the ExchangeRates for the network.
+     *
+     * @return the Optional of ExchangeRates for the Network
+     * @throws HederaException if an error occurs
+     */
+    @NonNull
+    Optional<ExchangeRates> queryExchangeRates() throws HederaException;
+
+    /**
+     * Queries the NetworkFee for the network.
+     *
+     * @return the List of NetworkFee for the Network
+     * @throws HederaException if an error occurs
+     */
+    @NonNull
+    List<NetworkFee> queryNetworkFees() throws HederaException;
+
+    /**
+     * Queries the NetworkStake for the network.
+     *
+     * @return the Optional of NetworkStake for the Network
+     * @throws HederaException if an error occurs
+     */
+    @NonNull
+    Optional<NetworkStake> queryNetworkStake() throws HederaException;
+
+    /**
+     * Queries the NetworkSupplies for the network.
+     *
+     * @return the Optional of NetworkSupplies for the Network
+     * @throws HederaException if an error occurs
+     */
+    @NonNull
+    Optional<NetworkSupplies> queryNetworkSupplies() throws HederaException;
 }

hedera-base/src/main/java/com/openelements/hedera/base/mirrornode/NetworkFee.java

@@ -0,0 +1,11 @@
+package com.openelements.hedera.base.mirrornode;
+
+import org.jspecify.annotations.NonNull;
+
+import java.util.Objects;
+
+public record NetworkFee(long gas, @NonNull String transactionType) {
+    public NetworkFee {
+        Objects.requireNonNull(transactionType, "transactionType must not be null");
+    }
+}

hedera-base/src/main/java/com/openelements/hedera/base/mirrornode/NetworkStake.java

@@ -0,0 +1,19 @@
+package com.openelements.hedera.base.mirrornode;
+
+public record NetworkStake(
+        long maxStakeReward,
+        long maxStakeRewardPerHbar,
+        long maxTotalReward,
+        double nodeRewardFeeFraction,
+        long reservedStakingRewards,
+        long rewardBalanceThreshold,
+        long stakeTotal,
+        long stakingPeriodDuration,
+        long stakingPeriodsStored,
+        double stakingRewardFeeFraction,
+        long stakingRewardRate,
+        long stakingStartThreshold,
+        long unreservedStakingRewardBalance
+) {
+    public NetworkStake {}
+}

hedera-base/src/main/java/com/openelements/hedera/base/mirrornode/NetworkSupplies.java

@@ -0,0 +1,12 @@
+package com.openelements.hedera.base.mirrornode;
+
+import org.jspecify.annotations.NonNull;
+
+import java.util.Objects;
+
+public record NetworkSupplies(@NonNull String releasedSupply, @NonNull String totalSupply) {
+    public NetworkSupplies {
+        Objects.requireNonNull(releasedSupply, "releasedSupply must not be null");
+        Objects.requireNonNull(totalSupply, "totalSupply must not be null");
+    }
+}

hedera-spring/src/main/java/com/openelements/hedera/spring/implementation/HederaAutoConfiguration.java

@@ -10,6 +10,7 @@
 import com.openelements.hedera.base.NftClient;
 import com.openelements.hedera.base.NftRepository;
 import com.openelements.hedera.base.AccountRepository;
+import com.openelements.hedera.base.NetworkRepository;
 import com.openelements.hedera.base.SmartContractClient;
 import com.openelements.hedera.base.implementation.AccountClientImpl;
 import com.openelements.hedera.base.implementation.FileClientImpl;
@@ -19,6 +20,7 @@
 import com.openelements.hedera.base.implementation.ProtocolLayerClientImpl;
 import com.openelements.hedera.base.implementation.SmartContractClientImpl;
 import com.openelements.hedera.base.implementation.AccountRepositoryImpl;
+import com.openelements.hedera.base.implementation.NetworkRepositoryImpl;
 import com.openelements.hedera.base.mirrornode.MirrorNodeClient;
 import com.openelements.hedera.base.protocol.ProtocolLayerClient;
 import java.net.URI;
@@ -209,6 +211,13 @@ AccountRepository accountRepository(final MirrorNodeClient mirrorNodeClient) {
         return new AccountRepositoryImpl(mirrorNodeClient);
     }
 
+    @Bean
+    @ConditionalOnProperty(prefix = "spring.hedera", name = "mirrorNodeSupported",
+            havingValue = "true", matchIfMissing = true)
+    NetworkRepository networkRepository(final MirrorNodeClient mirrorNodeClient) {
+        return new NetworkRepositoryImpl(mirrorNodeClient);
+    }
+
     @Bean
     ContractVerificationClient contractVerificationClient(HederaNetwork hederaNetwork) {
         return new ContractVerificationClientImplementation(hederaNetwork);