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

java.lang.Object
  extended by net.sourceforge.pmd.AbstractPropertySource
      extended by net.sourceforge.pmd.lang.rule.AbstractRule
          extended by net.sourceforge.pmd.lang.java.rule.AbstractJavaRule
              extended by net.sourceforge.pmd.lang.java.rule.AbstractInefficientZeroCheck
                  extended by net.sourceforge.pmd.lang.java.rule.design.UseCollectionIsEmptyRule
All Implemented Interfaces:
net.sourceforge.pmd.lang.java.ast.JavaParserVisitor, ImmutableLanguage, PropertySource, Rule

public class UseCollectionIsEmptyRule
extends AbstractInefficientZeroCheck

Detect structures like "foo.size() == 0" and suggest replacing them with foo.isEmpty(). Will also find != 0 (replaceable with !isEmpty()).

Author:
Jason Bennett

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
UseCollectionIsEmptyRule()
           
 
Method Summary
 boolean appliesToClassName(String name)
           
 boolean isTargetMethod(NameOccurrence occ)
          Determine if we're dealing with .size method
 
Methods inherited from class net.sourceforge.pmd.lang.java.rule.AbstractInefficientZeroCheck
visit
 
Methods inherited from class net.sourceforge.pmd.lang.java.rule.AbstractJavaRule
apply, getDeclaringType, importsPackage, isQualifiedName, 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

UseCollectionIsEmptyRule

public UseCollectionIsEmptyRule()
Method Detail

appliesToClassName

public boolean appliesToClassName(String name)
Specified by:
appliesToClassName in class AbstractInefficientZeroCheck

isTargetMethod

public boolean isTargetMethod(NameOccurrence occ)
Determine if we're dealing with .size method

Specified by:
isTargetMethod in class AbstractInefficientZeroCheck
Parameters:
occ - The name occurrence
Returns:
true if it's .length, else false


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