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Complete ledger-queries Java chaincode with full parity

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- Add TransferAssetByColor using composite keys.
- Add range query methods (GetAssetsByRange, GetAssetsByRangeWithPagination).
- Ensure composite key management in Create/Update/Delete methods.

Signed-off-by: SurbhiAgarwal1 <agarwalsurbhi1807@gmail.com>
This commit is contained in:
SurbhiAgarwal1 2026-04-16 09:11:06 +05:30
parent 36545ecb6b
commit 67f1cbc800
1 changed files with 71 additions and 13 deletions
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84
asset-transfer-ledger-queries/chaincode-java/src/main/java/org/hyperledger/fabric/samples/assettransfer/AssetTransfer.java
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@ -91,6 +91,10 @@ public final class AssetTransfer implements ContractInterface {
String sortedJson = genson.serialize(asset);
ctx.getStub().putStringState(asset.getAssetID(), sortedJson);
// Create composite key for color~name index
String indexKey = ctx.getStub().createCompositeKey("color~name", asset.getColor(), asset.getAssetID()).toString();
ctx.getStub().putState(indexKey, new byte[] {0x00});
return asset;
}
@ -129,13 +133,16 @@ public final class AssetTransfer implements ContractInterface {
public Asset UpdateAsset(final Context ctx, final String assetID, final String color, final int size,
final String owner, final int appraisedValue) {
if (!AssetExists(ctx, assetID)) {
String errorMessage = String.format("Asset %s does not exist", assetID);
System.out.println(errorMessage);
throw new ChaincodeException(errorMessage, AssetTransferErrors.ASSET_NOT_FOUND.toString());
Asset asset = ReadAsset(ctx, assetID);
// Delete old index if color changed
if (!asset.getColor().equals(color)) {
String oldIndexKey = ctx.getStub().createCompositeKey("color~name", asset.getColor(), asset.getAssetID()).toString();
ctx.getStub().delState(oldIndexKey);
}
return putAsset(ctx, new Asset("asset", assetID, color, size, owner, appraisedValue));
Asset updatedAsset = new Asset("asset", assetID, color, size, owner, appraisedValue);
return putAsset(ctx, updatedAsset);
}
/**
@ -146,13 +153,13 @@ public final class AssetTransfer implements ContractInterface {
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public void DeleteAsset(final Context ctx, final String assetID) {
if (!AssetExists(ctx, assetID)) {
String errorMessage = String.format("Asset %s does not exist", assetID);
System.out.println(errorMessage);
throw new ChaincodeException(errorMessage, AssetTransferErrors.ASSET_NOT_FOUND.toString());
}
Asset asset = ReadAsset(ctx, assetID);
ctx.getStub().delState(assetID);
// Delete composite key index
String indexKey = ctx.getStub().createCompositeKey("color~name", asset.getColor(), asset.getAssetID()).toString();
ctx.getStub().delState(indexKey);
}
/**
@ -182,11 +189,47 @@ public final class AssetTransfer implements ContractInterface {
Asset asset = ReadAsset(ctx, assetID);
String oldOwner = asset.getOwner();
putAsset(ctx, new Asset(asset.getDocType(), asset.getAssetID(), asset.getColor(), asset.getSize(), newOwner, asset.getAppraisedValue()));
Asset updatedAsset = new Asset(asset.getDocType(), asset.getAssetID(), asset.getColor(), asset.getSize(), newOwner, asset.getAppraisedValue());
putAsset(ctx, updatedAsset);
return oldOwner;
}
/**
* GetAssetsByRange performs a range query based on the start and end keys provided.
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public String GetAssetsByRange(final Context ctx, final String startKey, final String endKey) {
QueryResultsIterator<KeyValue> results = ctx.getStub().getStateByRange(startKey, endKey);
List<Asset> queryResults = new ArrayList<>();
for (KeyValue res : results) {
Asset asset = genson.deserialize(res.getStringValue(), Asset.class);
queryResults.add(asset);
}
return genson.serialize(queryResults);
}
/**
* TransferAssetByColor will transfer assets of a given color to a certain new owner.
* This method demonstrates the use of composite keys for range queries.
*/
@Transaction(intent = Transaction.TYPE.SUBMIT)
public void TransferAssetByColor(final Context ctx, final String color, final String newOwner) {
QueryResultsIterator<KeyValue> results = ctx.getStub().getStateByPartialCompositeKey("color~name", color);
for (KeyValue res : results) {
String compositeKey = res.getKey();
String[] keyParts = ctx.getStub().splitCompositeKey(compositeKey).getAttributes().toArray(new String[0]);
if (keyParts.length > 0) {
String assetID = keyParts[0]; // The second part of the composite key is the ID
TransferAsset(ctx, assetID, newOwner);
}
}
}
/**
* GetQueryResultForQueryString executes the passed in query string.
* Result set is built and returned as a list of assets.
@ -253,8 +296,23 @@ public final class AssetTransfer implements ContractInterface {
queryResults.add(asset);
}
// Return results and metadata (bookmark & fetched records count)
// For simplicity, we just return the results here in this sample.
return genson.serialize(queryResults);
}
/**
* GetAssetsByRangeWithPagination performs a range query based on the start and end key,
* page size and a bookmark.
*/
@Transaction(intent = Transaction.TYPE.EVALUATE)
public String GetAssetsByRangeWithPagination(final Context ctx, final String startKey, final String endKey, final int pageSize, final String bookmark) {
QueryResultsIteratorWithMetadata<KeyValue> results = ctx.getStub().getStateByRangeWithPagination(startKey, endKey, pageSize, bookmark);
List<Asset> queryResults = new ArrayList<>();
for (KeyValue res: results) {
Asset asset = genson.deserialize(res.getStringValue(), Asset.class);
queryResults.add(asset);
}
return genson.serialize(queryResults);
}
}