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Showing content from http://codenarc.github.io/CodeNarc/codenarc-rules-imports.html below:

CodeNarc - Imports Rules

Checks for a duplicate import statements.

NOTE: This is a file-based rule, rather than a typical AST-based rule, so the applyToClassNames and doNotApplyToClassNames rule configuration properties are not available. See Standard Properties for Configuring Rules.

Checks for an import of a class that is within the same package as the importing class.

NOTE: This is a file-based rule, rather than a typical AST-based rule, so the applyToClassNames and doNotApplyToClassNames rule configuration properties are not available. See Standard Properties for Configuring Rules.

Since CodeNarc 0.14 Avoid importing anything from the ‘sun.*’ packages. These packages are not portable and are likely to change.

Example of violations:

    import sun.misc.foo
    import sun.misc.foo as Foo

    public class MyClass{}

NOTE: This is a file-based rule, rather than a typical AST-based rule, so the applyToClassNames and doNotApplyToClassNames rule configuration properties are not available. See Standard Properties for Configuring Rules.

Since CodeNarc 0.14 Checks for static import statements which should never be after nonstatic imports.

This rule has one property comesBefore, which defaults to true. If you like your static imports to come after the others, then set this property to false.

Examples of violations:

    import my.something.another
    import static foo.bar

    public class MyClass{}

NOTE: This is a file-based rule, rather than a typical AST-based rule, so the applyToClassNames and doNotApplyToClassNames rule configuration properties are not available. See Standard Properties for Configuring Rules.

Since CodeNarc 0.21

Checks for wildcard (star) imports. If the ignoreStaticImports property is true, then do not check static imports. Similarly, do not check the standard imports if ignoreImports is true.

Example of violations:

    import static foo.bar.*         // violation (unless ignoreStaticImports is true)
    import my.something.*           // violation (unless ignoreImports is true)

    public class MyClass{}

NOTE: This is a file-based rule, rather than a typical AST-based rule, so the applyToClassNames and doNotApplyToClassNames rule configuration properties are not available. See Standard Properties for Configuring Rules.

Checks for an import from any package that is already automatically imported for Groovy files. A Groovy file does not need to include an import for classes from java.lang, java.util, java.io, java.net, groovy.lang and groovy.util, as well as the classes java.math.BigDecimal and java.math.BigInteger.

NOTE: This is a file-based rule, rather than a typical AST-based rule, so the applyToClassNames and doNotApplyToClassNames rule configuration properties are not available. See Standard Properties for Configuring Rules.

Checks for import statements for classes that are never referenced within the source file. Also checks static imports.

Known limitations:

• Does not check for unused imports containing wildcards (e.g. import org.codenarc.*)
• Misses unused imports if the class/alias name is contained within strings, comments or other (longer) names (i.e., if that string shows up almost anywhere within the source code).

NOTE: This is a file-based rule, rather than a typical AST-based rule, so the applyToClassNames and doNotApplyToClassNames rule configuration properties are not available. See Standard Properties for Configuring Rules.

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