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…-from-cip57-plutusblueprints
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84 changes: 84 additions & 0 deletions
84
address/src/main/java/com/bloxbean/cardano/client/address/PointerAddress.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package com.bloxbean.cardano.client.address; | ||
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| import com.bloxbean.cardano.client.exception.AddressRuntimeException; | ||
| import com.bloxbean.cardano.client.util.Tuple; | ||
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| import java.util.Arrays; | ||
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| /** | ||
| * PointerAddress class represents Shelley Pointer address. This class is useful to decode Pointer address and get the Pointer | ||
| */ | ||
| public class PointerAddress extends Address { | ||
| private Pointer pointer; | ||
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| public PointerAddress(String prefix, byte[] bytes) { | ||
| super(prefix, bytes); | ||
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| if (getAddressType() != AddressType.Ptr) | ||
| throw new AddressRuntimeException("Invalid address type. Expected Pointer address type"); | ||
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| decodePointer(); | ||
| } | ||
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| public PointerAddress(String address) { | ||
| super(address); | ||
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| if (getAddressType() != AddressType.Ptr) | ||
| throw new AddressRuntimeException("Invalid address type. Expected Pointer address type"); | ||
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| decodePointer(); | ||
| } | ||
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| public PointerAddress(byte[] addressBytes) { | ||
| super(addressBytes); | ||
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| if (getAddressType() != AddressType.Ptr) | ||
| throw new AddressRuntimeException("Invalid address type. Expected Pointer address type"); | ||
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| decodePointer(); | ||
| } | ||
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| private void decodePointer() { | ||
| byte[] pointerBytes = getDelegationCredentialHash() | ||
| .orElseThrow(() -> new AddressRuntimeException("Delegation credential hash not found")); | ||
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| int index = 0; | ||
| Tuple<Long, Integer> slot = variableNatDecode(pointerBytes); | ||
| index += slot._2; | ||
| Tuple<Long, Integer> txIndex = variableNatDecode(getSubBytes(pointerBytes, index)); | ||
| index += txIndex._2; | ||
| Tuple<Long, Integer> certIndex = variableNatDecode(getSubBytes(pointerBytes, index)); | ||
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| pointer = new Pointer(slot._1, txIndex._1.intValue(), certIndex._1.intValue()); | ||
| } | ||
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| private Tuple<Long, Integer> variableNatDecode(byte[] raw) { | ||
| long output = 0; | ||
| int bytesRead = 0; | ||
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| for (byte rbyte : raw) { | ||
| output = (output << 7) | (rbyte & 0x7F); | ||
| bytesRead++; | ||
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| if ((rbyte & 0x80) == 0) { | ||
| return new Tuple<>(output, bytesRead); | ||
| } | ||
| } | ||
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| throw new IllegalArgumentException("Invalid variable nat encoding. Unexpected bytes"); | ||
| } | ||
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| // Get subarray from startPosition to the end of the array | ||
| private byte[] getSubBytes(byte[] array, int startPosition) { | ||
| // Validate startPosition | ||
| if (startPosition < 0 || startPosition > array.length) { | ||
| throw new IllegalArgumentException("Invalid start position"); | ||
| } | ||
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| return Arrays.copyOfRange(array, startPosition, array.length); | ||
| } | ||
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| public Pointer getPointer() { | ||
| return pointer; | ||
| } | ||
| } |
26 changes: 26 additions & 0 deletions
26
address/src/test/java/com/bloxbean/cardano/client/address/PointerAddressTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| package com.bloxbean.cardano.client.address; | ||
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| import org.junit.jupiter.api.Test; | ||
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| import static org.junit.jupiter.api.Assertions.*; | ||
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| class PointerAddressTest { | ||
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| @Test | ||
| void getPointer() { | ||
| PointerAddress pointerAddress = new PointerAddress("addr1gx2fxv2umyhttkxyxp8x0dlpdt3k6cwng5pxj3jhsydzer5ph3wczvf2w8lunk"); | ||
| assertEquals(new Pointer(24157, 177, 42), pointerAddress.getPointer()); | ||
| } | ||
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| @Test | ||
| void getPointer2() { | ||
| PointerAddress pointerAddress = new PointerAddress("addr_test1gz2fxv2umyhttkxyxp8x0dlpdt3k6cwng5pxj3jhsydzerspqgpsqe70et"); | ||
| assertEquals(new Pointer(1, 2, 3), pointerAddress.getPointer()); | ||
| } | ||
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| @Test | ||
| void getPointer3() { | ||
| PointerAddress pointerAddress = new PointerAddress("addr128phkx6acpnf78fuvxn0mkew3l0fd058hzquvz7w36x4gtupnz75xxcrtw79hu"); | ||
| assertEquals(new Pointer(2498243, 27, 3), pointerAddress.getPointer()); | ||
| } | ||
| } |
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