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Implemented `toList()`, `getFirstOrNull()`, and `size()`
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Hello @lvca, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
Summary of Changes
As gemini-code-assist, I've reviewed this pull request titled "Iterable graph". The primary goal of this PR is to introduce a new IterableGraph interface that extends the standard Iterable and provides convenient utility methods specifically for graph elements (like getFirstOrNull, toList, and size). The changes involve refactoring various methods across the codebase, particularly those in GraphEngine and Vertex implementations, to return this new IterableGraph interface instead of the basic Iterable. This aims to enhance the graph traversal API by offering more built-in functionality directly on the returned iterable objects, improving code readability and simplifying common operations.
Highlights
- Refactoring Graph Traversal Methods: Updated methods in
GraphEngineand theVertexinterface (and its implementations likeImmutableVertex,MutableVertex,SynchronizedVertex,RemoteImmutableVertex,RemoteMutableVertex, andRemoteVertex) that previously returnedIterable<Edge>orIterable<Vertex>to now returnIterableGraph<Edge>orIterableGraph<Vertex>respectively. - MultiIterator Integration: The
MultiIteratorutility class has been updated to implement the newIterableGraphinterface, allowing it to also benefit from the added utility methods.
Changelog
Click here to see the changelog
- engine/src/main/java/com/arcadedb/graph/GraphEngine.java
- Changed return type of
getEdges()methods (lines 442, 456) fromIterable<Edge>toIterableGraph<Edge>. - Changed return type of
getVertices()methods (lines 497, 519) fromIterable<Vertex>toIterableGraph<Vertex>. - Replaced
Collections.emptyList()withIterableGraph.emptyList()for empty results (lines 489, 552).
- Changed return type of
- engine/src/main/java/com/arcadedb/graph/ImmutableVertex.java
- Updated return types of
getEdges()(line 155) andgetVertices()(line 165, 170) methods toIterableGraph.
- Updated return types of
- engine/src/main/java/com/arcadedb/graph/IterableGraph.java
- New file added defining the
IterableGraphinterface withgetFirstOrNull,toList,size, andemptyListmethods.
- New file added defining the
- engine/src/main/java/com/arcadedb/graph/MutableVertex.java
- Updated return types of
getEdges()(line 167) andgetVertices()(line 177, 182) methods toIterableGraph.
- Updated return types of
- engine/src/main/java/com/arcadedb/graph/SynchronizedVertex.java
- Updated return types of
getEdges()(line 93) andgetVertices()(line 103, 108) methods toIterableGraph.
- Updated return types of
- engine/src/main/java/com/arcadedb/graph/Vertex.java
- Updated interface method signatures for
getEdges()(line 60, 62) andgetVertices()(line 69, 78) to returnIterableGraph.
- Updated interface method signatures for
- engine/src/main/java/com/arcadedb/utility/MultiIterator.java
- Made
MultiIteratorimplement theIterableGraphinterface (line 30).
- Made
- network/src/main/java/com/arcadedb/remote/RemoteImmutableVertex.java
- Added import for
IterableGraph(line 26). - Updated return types of
getEdges()(line 64) andgetVertices()(line 74, 79) methods toIterableGraph.
- Added import for
- network/src/main/java/com/arcadedb/remote/RemoteMutableVertex.java
- Added import for
IterableGraph(line 29). - Updated return types of
getEdges()(line 158) andgetVertices()(line 168, 173) methods toIterableGraph.
- Added import for
- network/src/main/java/com/arcadedb/remote/RemoteVertex.java
- Added import for
IterableGraph(line 25). - Updated return types of
getEdges()(line 60, 64) andgetVertices()(line 79, 83) methods toIterableGraph.
- Added import for
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An interface new,
Graph iterables come through,
Methods now abound.
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Code Review
This pull request introduces the IterableGraph interface, which extends Iterable with useful utility methods like getFirstOrNull, toList, and size. This is a good initiative to enhance the graph traversal API and provide more convenience for developers. The changes are consistently applied across the codebase, and the use of default methods in the new interface is well-leveraged.
I've identified a couple of areas for potential improvement, primarily concerning the size() method's handling of large collections and the Java version compatibility of List.getFirst().
Summary of Findings
- Potential Integer Overflow in
IterableGraph.size(): Thesize()method inIterableGraphcasts alongcount fromMultiIterator.countEntries()toint. This can lead to data loss and an incorrect size if the number of entries exceedsInteger.MAX_VALUE. Severity: Medium. - Java Version Compatibility for
List.getFirst(): ThegetFirstOrNull()method usesList.getFirst(), which is available from Java 21. If the project targets an older Java version, this will cause a runtime error. Severity: Medium (conditional on target Java version). - Naming of
IterableGraph.emptyList(): The static methodemptyList()returns anIterableGraph. While common, names likeemptyIterable()orempty()might be slightly more semantically precise as the returned object isn't strictly aList. This is a minor point. Severity: Low. (Not commented due to severity filter settings). - Testing for
IterableGraphdefault methods: Consider adding specific unit tests for the new default methods inIterableGraph(getFirstOrNull,toList,size) to cover various underlyingIterableimplementations (e.g.,List,MultiIterator, and a generic single-pass iterator) and edge cases. Severity: Low. (Not commented due to severity filter settings).
Merge Readiness
The pull request introduces valuable enhancements to the graph API. However, there are a couple of medium-severity issues related to potential integer overflow in the size() method and Java version compatibility for List.getFirst() that should be addressed before merging. Once these points are clarified or resolved, the PR should be in good shape.
Please note that I am an AI assistant and cannot approve pull requests. Ensure that other reviewers inspect and approve these changes before merging.
| else if (this instanceof MultiIterator<T> it) | ||
| return (int) it.countEntries(); |
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The size() method casts it.countEntries() (which returns a long) to an int. If MultiIterator.countEntries() returns a value greater than Integer.MAX_VALUE, this cast will lead to an incorrect (truncated) size. This could be problematic if a MultiIterator instance is expected to handle a very large number of entries (more than 2 billion).
Could you consider how to best handle this potential overflow? Throwing an ArithmeticException or returning Integer.MAX_VALUE with a warning are options if the return type must remain int.
else if (this instanceof MultiIterator<T> it) {
long count = it.countEntries();
if (count > Integer.MAX_VALUE) {
// Throw an exception to indicate overflow, as returning a truncated int can be misleading.
throw new ArithmeticException("Size of MultiIterator (" + count + ") exceeds Integer.MAX_VALUE.");
}
return (int) count;
}| if (this instanceof List<?> list) | ||
| return list.isEmpty() ? null : (T) list.getFirst(); |
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The getFirstOrNull() method uses list.getFirst(), which was introduced in Java 21. If this project targets an earlier Java version (e.g., Java 11, 17), this method call will result in a NoSuchMethodError at runtime.
What is the minimum Java version this project is intended to support? If it's below Java 21, it would be safer to use list.get(0) after checking !list.isEmpty().
if (this instanceof List<?> list)
return list.isEmpty() ? null : (T) list.get(0); // Use get(0) for compatibility with Java < 21
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Implemented `toList()`, `getFirstOrNull()`, and `size()` (cherry picked from commit 0fce213)
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This pull request introduces a new
IterableGraphinterface and updates various methods across the codebase to use this interface instead of the standardIterable. The changes aim to provide additional utility methods for graph traversal and simplify operations on graph elements.Introduction of
IterableGraphInterfaceengine/src/main/java/com/arcadedb/graph/IterableGraph.java: Added theIterableGraphinterface, which extendsIterableand includes utility methods likegetFirstOrNull,toList, andsize. It also provides a static methodemptyListfor creating empty graph iterables.Updates to GraphEngine and Vertex Methods
engine/src/main/java/com/arcadedb/graph/GraphEngine.java: Updated methods such asgetEdgesandgetVerticesto returnIterableGraphinstead ofIterable. This change applies to all method overloads and ensures consistency across vertex and edge traversal. [1] [2] [3] [4] [5]engine/src/main/java/com/arcadedb/graph/Vertex.java: Updated theVertexinterface to useIterableGraphfor methods likegetEdgesandgetVertices, aligning with the new interface. [1] [2]Integration with Existing Vertex Implementations
ImmutableVertex,MutableVertex,SynchronizedVertex,RemoteImmutableVertex,RemoteMutableVertex, andRemoteVertexclasses to returnIterableGraphfor their edge and vertex traversal methods. This ensures that all vertex implementations leverage the newIterableGraphinterface. [1] [2] [3] [4] [5] [6] [7]Extension of
MultiIteratorengine/src/main/java/com/arcadedb/utility/MultiIterator.java: ModifiedMultiIteratorto implementIterableGraph, enabling it to benefit from the new utility methods provided by the interface.These changes enhance the graph traversal API by introducing a more feature-rich interface (
IterableGraph) and ensuring its adoption across the codebase. This refactoring improves code readability, consistency, and functionality for graph-related operations.## What does this PR do?A brief description of the change being made with this pull request.
Motivation
What inspired you to submit this pull request?
Related issues
A list of issues either fixed, containing architectural discussions, otherwise relevant
for this Pull Request.
Additional Notes
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Checklist
mvn clean packagecommand