net.sourceforge.pmd.lang.java.rule.design
Class ConfusingTernaryRule

java.lang.Object
  net.sourceforge.pmd.AbstractPropertySource
      net.sourceforge.pmd.lang.rule.AbstractRule
          net.sourceforge.pmd.lang.java.rule.AbstractJavaRule
              net.sourceforge.pmd.lang.java.rule.design.ConfusingTernaryRule

All Implemented Interfaces:

JavaParserVisitor, ImmutableLanguage, PropertySource, Rule

public class ConfusingTernaryRule
extends AbstractJavaRule

if (x != y) { diff(); } else { same(); } and
(!x ? diff() : same());.

XPath can handle the easy cases, e.g.:

    //IfStatement[
      Statement[2]
      and Expression[
        EqualityExpression[@Image="!="] or
        UnaryExpressionNotPlusMinus[@Image="!"]]]
 

but "&&" and "||" are difficult, since we need a match for all children instead of just one. This can be done by using a double-negative, e.g.:

    not(*[not(matchme)])
 

Still, XPath is unable to handle arbitrarily nested cases, since it lacks recursion, e.g.:

 if (((x != !y)) || !(x)) {
     diff();
 } else {
     same();
 }
 

Field Summary

Fields inherited from class net.sourceforge.pmd.AbstractPropertySource

propertyDescriptors, propertyValuesByDescriptor

Fields inherited from interface net.sourceforge.pmd.Rule

VIOLATION_SUPPRESS_REGEX_DESCRIPTOR, VIOLATION_SUPPRESS_XPATH_DESCRIPTOR

Constructor Summary

ConfusingTernaryRule()

Method Summary

Object	visit(ASTConditionalExpression node, Object data)
Object	visit(ASTIfStatement node, Object data)

Methods inherited from class net.sourceforge.pmd.lang.java.rule.AbstractJavaRule

apply, getDeclaringType, importsPackage, isQualifiedName, isSuppressed, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitAll

Methods inherited from class net.sourceforge.pmd.lang.rule.AbstractRule

addExample, addRuleChainVisit, addRuleChainVisit, addViolation, addViolation, addViolation, addViolationWithMessage, addViolationWithMessage, addViolationWithMessage, deepCopyValuesTo, end, equals, getDescription, getExamples, getExternalInfoUrl, getLanguage, getMaximumLanguageVersion, getMessage, getMinimumLanguageVersion, getName, getParserOptions, getPriority, getRuleChainVisits, getRuleClass, getRuleSetName, getSince, hashCode, isDeprecated, setDeprecated, setDescription, setExternalInfoUrl, setLanguage, setMaximumLanguageVersion, setMessage, setMinimumLanguageVersion, setName, setPriority, setRuleClass, setRuleSetName, setSince, setUsesDFA, setUsesTypeResolution, start, usesDFA, usesRuleChain, usesTypeResolution

Methods inherited from class net.sourceforge.pmd.AbstractPropertySource

copyPropertyDescriptors, copyPropertyValues, definePropertyDescriptor, dysfunctionReason, getPropertiesByPropertyDescriptor, getProperty, getPropertyDescriptor, getPropertyDescriptors, hasDescriptor, ignoredProperties, setProperty, useDefaultValueFor, usesDefaultValues

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface net.sourceforge.pmd.PropertySource

definePropertyDescriptor, dysfunctionReason, getPropertiesByPropertyDescriptor, getProperty, getPropertyDescriptor, getPropertyDescriptors, hasDescriptor, ignoredProperties, setProperty, useDefaultValueFor, usesDefaultValues

Constructor Detail

ConfusingTernaryRule

public ConfusingTernaryRule()

Method Detail

visit

public Object visit(ASTIfStatement node,
                    Object data)

Specified by:

visit in interface JavaParserVisitor

Overrides:

visit in class AbstractJavaRule

visit

public Object visit(ASTConditionalExpression node,
                    Object data)

Specified by:

visit in interface JavaParserVisitor

Overrides:

visit in class AbstractJavaRule