com.puppycrawl.tools.checkstyle.meta.checks.annotation.AnnotationUseStyleCheck.xml Maven / Gradle / Ivy

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Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard
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<?xml version="1.0" encoding="UTF-8"?>
<checkstyle-metadata>
   <module>
      <check fully-qualified-name="com.puppycrawl.tools.checkstyle.checks.annotation.AnnotationUseStyleCheck"
             name="AnnotationUseStyle"
             parent="com.puppycrawl.tools.checkstyle.TreeWalker">
         <description>&lt;div&gt;
 Checks the style of elements in annotations.
 &lt;/div&gt;

 &lt;p&gt;
 Annotations have three element styles starting with the least verbose.
 &lt;/p&gt;
 &lt;ul&gt;
 &lt;li&gt;
 {@code ElementStyleOption.COMPACT_NO_ARRAY}
 &lt;/li&gt;
 &lt;li&gt;
 {@code ElementStyleOption.COMPACT}
 &lt;/li&gt;
 &lt;li&gt;
 {@code ElementStyleOption.EXPANDED}
 &lt;/li&gt;
 &lt;/ul&gt;

 &lt;p&gt;
 To not enforce an element style a {@code ElementStyleOption.IGNORE} type is provided.
 The desired style can be set through the {@code elementStyle} property.
 &lt;/p&gt;

 &lt;p&gt;
 Using the {@code ElementStyleOption.EXPANDED} style is more verbose.
 The expanded version is sometimes referred to as "named parameters" in other languages.
 &lt;/p&gt;

 &lt;p&gt;
 Using the {@code ElementStyleOption.COMPACT} style is less verbose.
 This style can only be used when there is an element called 'value' which is either
 the sole element or all other elements have default values.
 &lt;/p&gt;

 &lt;p&gt;
 Using the {@code ElementStyleOption.COMPACT_NO_ARRAY} style is less verbose.
 It is similar to the {@code ElementStyleOption.COMPACT} style but single value arrays are
 flagged.
 With annotations a single value array does not need to be placed in an array initializer.
 &lt;/p&gt;

 &lt;p&gt;
 The ending parenthesis are optional when using annotations with no elements.
 To always require ending parenthesis use the {@code ClosingParensOption.ALWAYS} type.
 To never have ending parenthesis use the {@code ClosingParensOption.NEVER} type.
 To not enforce a closing parenthesis preference a {@code ClosingParensOption.IGNORE} type is
 provided.
 Set this through the {@code closingParens} property.
 &lt;/p&gt;

 &lt;p&gt;
 Annotations also allow you to specify arrays of elements in a standard format.
 As with normal arrays, a trailing comma is optional.
 To always require a trailing comma use the {@code TrailingArrayCommaOption.ALWAYS} type.
 To never have a trailing comma use the {@code TrailingArrayCommaOption.NEVER} type.
 To not enforce a trailing array comma preference a {@code TrailingArrayCommaOption.IGNORE} type
 is provided. Set this through the {@code trailingArrayComma} property.
 &lt;/p&gt;

 &lt;p&gt;
 By default, the {@code ElementStyleOption} is set to {@code },
 the {@code TrailingArrayCommaOption} is set to {@code },
 and the {@code ClosingParensOption} is set to {@code }.
 &lt;/p&gt;

 &lt;p&gt;
 According to the JLS, it is legal to include a trailing comma
 in arrays used in annotations but Sun's Java 5 &amp;amp; 6 compilers will not
 compile with this syntax. This may in be a bug in Sun's compilers
 since eclipse 3.4's built-in compiler does allow this syntax as
 defined in the JLS. Note: this was tested with compilers included with
 JDK versions 1.5.0.17 and 1.6.0.11 and the compiler included with eclipse 3.4.1.
 &lt;/p&gt;

 &lt;p&gt;
 See &lt;a href="https://docs.oracle.com/javase/specs/jls/se11/html/jls-9.html#jls-9.7"&gt;
 Java Language specification, &amp;#167;9.7&lt;/a&gt;.
 &lt;/p&gt;</description>
         <properties>
            <property default-value="never"
                      name="closingParens"
                      type="com.puppycrawl.tools.checkstyle.checks.annotation.AnnotationUseStyleCheck$ClosingParensOption">
               <description>Define the policy for ending parenthesis.</description>
            </property>
            <property default-value="compact_no_array"
                      name="elementStyle"
                      type="com.puppycrawl.tools.checkstyle.checks.annotation.AnnotationUseStyleCheck$ElementStyleOption">
               <description>Define the annotation element styles.</description>
            </property>
            <property default-value="never"
                      name="trailingArrayComma"
                      type="com.puppycrawl.tools.checkstyle.checks.annotation.AnnotationUseStyleCheck$TrailingArrayCommaOption">
               <description>Define the policy for trailing comma in arrays.</description>
            </property>
         </properties>
         <message-keys>
            <message-key key="annotation.incorrect.style"/>
            <message-key key="annotation.parens.missing"/>
            <message-key key="annotation.parens.present"/>
            <message-key key="annotation.trailing.comma.missing"/>
            <message-key key="annotation.trailing.comma.present"/>
         </message-keys>
      </check>
   </module>
</checkstyle-metadata>