Method performExecute
has a Cognitive Complexity of 30 (exceeds 5 allowed). Consider refactoring. Open
@Override
protected PortObject[] performExecute(PortObject[] inObjects,
ExecutionContext exec) throws Exception {
BufferedDataTable table = (BufferedDataTable)inObjects[0];
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Cognitive Complexity
Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.
A method's cognitive complexity is based on a few simple rules:
- Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
- Code is considered more complex for each "break in the linear flow of the code"
- Code is considered more complex when "flow breaking structures are nested"
Further reading
Method performExecute
has 80 lines of code (exceeds 25 allowed). Consider refactoring. Open
@Override
protected PortObject[] performExecute(PortObject[] inObjects,
ExecutionContext exec) throws Exception {
BufferedDataTable table = (BufferedDataTable)inObjects[0];
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File ModelPlotterNodeModel.java
has 261 lines of code (exceeds 250 allowed). Consider refactoring. Open
/*******************************************************************************
* Copyright (c) 2015 Federal Institute for Risk Assessment (BfR), Germany
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
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Method getTuples
has a Cognitive Complexity of 12 (exceeds 5 allowed). Consider refactoring. Open
private static List<KnimeTuple> getTuples(DataTable table) {
boolean isTertiaryModel = SchemaFactory.createM12Schema().conforms(
table);
boolean containsData = SchemaFactory.createDataSchema().conforms(table);
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Cognitive Complexity
Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.
A method's cognitive complexity is based on a few simple rules:
- Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
- Code is considered more complex for each "break in the linear flow of the code"
- Code is considered more complex when "flow breaking structures are nested"
Further reading
Method createOutputDataTables
has 26 lines of code (exceeds 25 allowed). Consider refactoring. Open
private BufferedDataTable[] createOutputDataTables(final ExecutionContext exec) {
ModelPlotterViewValue value = getViewValue();
DataTableSpec[] outSpces = createOutputDataTableSpecs();
BufferedDataContainer constBC = exec.createDataContainer(outSpces[0]);
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Method createOutputDataTables
has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring. Open
private BufferedDataTable[] createOutputDataTables(final ExecutionContext exec) {
ModelPlotterViewValue value = getViewValue();
DataTableSpec[] outSpces = createOutputDataTableSpecs();
BufferedDataContainer constBC = exec.createDataContainer(outSpces[0]);
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Cognitive Complexity
Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.
A method's cognitive complexity is based on a few simple rules:
- Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
- Code is considered more complex for each "break in the linear flow of the code"
- Code is considered more complex when "flow breaking structures are nested"
Further reading
Refactor this method to reduce its Cognitive Complexity from 30 to the 15 allowed. Open
protected PortObject[] performExecute(PortObject[] inObjects,
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- Exclude checks
Cognitive Complexity is a measure of how hard the control flow of a method is to understand. Methods with high Cognitive Complexity will be difficult to maintain.
See
Define a constant instead of duplicating this literal "No model functions to plot in input data table!" 3 times. Open
setWarningMessage("No model functions to plot in input data table!");
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- Exclude checks
Duplicated string literals make the process of refactoring error-prone, since you must be sure to update all occurrences.
On the other hand, constants can be referenced from many places, but only need to be updated in a single place.
Noncompliant Code Example
With the default threshold of 3:
public void run() { prepare("action1"); // Noncompliant - "action1" is duplicated 3 times execute("action1"); release("action1"); } @SuppressWarning("all") // Compliant - annotations are excluded private void method1() { /* ... */ } @SuppressWarning("all") private void method2() { /* ... */ } public String method3(String a) { System.out.println("'" + a + "'"); // Compliant - literal "'" has less than 5 characters and is excluded return ""; // Compliant - literal "" has less than 5 characters and is excluded }
Compliant Solution
private static final String ACTION_1 = "action1"; // Compliant public void run() { prepare(ACTION_1); // Compliant execute(ACTION_1); release(ACTION_1); }
Exceptions
To prevent generating some false-positives, literals having less than 5 characters are excluded.
Add a nested comment explaining why this method is empty, throw an UnsupportedOperationException or complete the implementation. Open
public void setHideInWizard(boolean hide) {
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- Exclude checks
There are several reasons for a method not to have a method body:
- It is an unintentional omission, and should be fixed to prevent an unexpected behavior in production.
- It is not yet, or never will be, supported. In this case an
UnsupportedOperationException
should be thrown. - The method is an intentionally-blank override. In this case a nested comment should explain the reason for the blank override.
Noncompliant Code Example
public void doSomething() { } public void doSomethingElse() { }
Compliant Solution
@Override public void doSomething() { // Do nothing because of X and Y. } @Override public void doSomethingElse() { throw new UnsupportedOperationException(); }
Exceptions
Default (no-argument) constructors are ignored when there are other constructors in the class, as are empty methods in abstract classes.
public abstract class Animal { void speak() { // default implementation ignored } }
Identical blocks of code found in 2 locations. Consider refactoring. Open
private static List<KnimeTuple> getTuples(DataTable table) {
boolean isTertiaryModel = SchemaFactory.createM12Schema().conforms(
table);
boolean containsData = SchemaFactory.createDataSchema().conforms(table);
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Duplicated Code
Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:
Every piece of knowledge must have a single, unambiguous, authoritative representation within a system.
When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).
Tuning
This issue has a mass of 104.
We set useful threshold defaults for the languages we support but you may want to adjust these settings based on your project guidelines.
The threshold configuration represents the minimum mass a code block must have to be analyzed for duplication. The lower the threshold, the more fine-grained the comparison.
If the engine is too easily reporting duplication, try raising the threshold. If you suspect that the engine isn't catching enough duplication, try lowering the threshold. The best setting tends to differ from language to language.
See codeclimate-duplication
's documentation for more information about tuning the mass threshold in your .codeclimate.yml
.
Refactorings
- Extract Method
- Extract Class
- Form Template Method
- Introduce Null Object
- Pull Up Method
- Pull Up Field
- Substitute Algorithm
Further Reading
- Don't Repeat Yourself on the C2 Wiki
- Duplicated Code on SourceMaking
- Refactoring: Improving the Design of Existing Code by Martin Fowler. Duplicated Code, p76