Rules that flag suboptimal code.
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AvoidAxisNavigation
Since: PMD 5.0
Priority: Medium (3)
Avoid using the ‘following’ or ‘preceding’ axes whenever possible, as these can cut through 100% of the document in the worst case. Also, try to avoid using ‘descendant’ or ‘descendant-or-self’ axes, as if you’re at the top of the Document, it necessarily means cutting through 100% of the document.
This rule is defined by the following XPath expression:
//node()[
contains(@select,'preceding::')
or
contains(@select,'following::')
or
contains(@select,'descendant::')
or
contains(@select,'descendant-self::')
or (
($checkSelfDescendantAbreviation = true() )
and
contains(@select,'//')
)
]
Example(s):
<xsl:variable name="var" select="//item/descendant::child"/>
This rule has the following properties:
Name | Default Value | Description | Multivalued |
---|---|---|---|
checkSelfDescendantAbreviation | false | descendant::self abreviation, ‘//’, will also trigger this rule. | no |
Use this rule with the default properties by just referencing it:
<rule ref="category/xsl/performance.xml/AvoidAxisNavigation" />
Use this rule and customize it:
<rule ref="category/xsl/performance.xml/AvoidAxisNavigation">
<properties>
<property name="checkSelfDescendantAbreviation" value="false" />
</properties>
</rule>