Add dogecoin regtest support

core/src/main/java/org/libdohj/params/AbstractDogecoinParams.java

@@ -85,7 +85,8 @@ public abstract class AbstractDogecoinParams extends NetworkParameters implement
     public static final String ID_DOGE_MAINNET = "org.dogecoin.production";
     /** The string returned by getId() for the testnet. */
     public static final String ID_DOGE_TESTNET = "org.dogecoin.test";
-
+    public static final String ID_DOGE_REGTEST = "org.dogecoin.regtest";
+
     protected final int newInterval;
     protected final int newTargetTimespan;
     protected final int diffChangeTarget;

core/src/main/java/org/libdohj/params/DogecoinRegTestParams.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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 org.libdohj.params;
+
+import org.bitcoinj.core.Block;
+import org.bitcoinj.core.StoredBlock;
+import org.bitcoinj.core.VerificationException;
+import org.bitcoinj.store.BlockStore;
+import org.bitcoinj.store.BlockStoreException;
+
+import java.math.BigInteger;
+
+import static com.google.common.base.Preconditions.checkState;
+
+/**
+ * Network parameters for the regression test mode of dogecoin in which all blocks are trivially solvable.
+ */
+public class DogecoinRegTestParams extends DogecoinTestNet3Params {
+    private static final BigInteger MAX_TARGET = new BigInteger("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16);
+
+    public DogecoinRegTestParams() {
+        super();
+        // Difficulty adjustments are disabled for regtest.
+        // By setting the block interval for difficulty adjustments to Integer.MAX_VALUE we make sure difficulty never changes.
+        interval = Integer.MAX_VALUE;
+        maxTarget = MAX_TARGET;
+        subsidyDecreaseBlockCount = 150;
+        port = 18444;
+        id = ID_DOGE_REGTEST;
+        packetMagic = 0xfabfb5da;
+        addressHeader = 111;
+        dumpedPrivateKeyHeader = 239;
+    }
+
+    @Override
+    public boolean allowEmptyPeerChain() {
+        return true;
+    }
+
+    private static Block genesis;
+
+    @Override
+    public Block getGenesisBlock() {
+        synchronized (DogecoinRegTestParams.class) {
+            if (genesis == null) {
+                genesis = super.getGenesisBlock();
+                genesis.setNonce(2);
+                genesis.setDifficultyTarget(0x207fffffL);
+                genesis.setTime(1296688602L);
+                checkState(genesis.getVersion() == 1);
+                checkState(genesis.getHashAsString().toLowerCase().equals("3d2160a3b5dc4a9d62e7e66a295f70313ac808440ef7400d6c0772171ce973a5"));
+                genesis.verifyHeader();
+            }
+            return genesis;
+        }
+    }
+
+    private static DogecoinRegTestParams instance;
+
+    public static synchronized DogecoinRegTestParams get() {
+        if (instance == null) {
+            instance = new DogecoinRegTestParams();
+        }
+        return instance;
+    }
+
+    @Override
+    public String getPaymentProtocolId() {
+        return ID_DOGE_REGTEST;
+    }
+
+    @Override
+    /** the testnet rules don't work for regtest, where difficulty stays the same */
+    public long calculateNewDifficultyTarget(StoredBlock storedPrev, Block nextBlock, BlockStore blockStore)
+            throws VerificationException, BlockStoreException {
+        final Block prev = storedPrev.getHeader();
+        return prev.getDifficultyTarget();
+    }
+
+    @Override
+    public boolean allowMinDifficultyBlocks() {
+        return false;
+    }
+
+    @Override
+    public boolean isTestNet() {
+        return false;
+    }
+}