Package net.sourceforge.pmd.lang.java.rule.bestpractices

Class UseCollectionIsEmptyRule

java.lang.Object

net.sourceforge.pmd.properties.AbstractPropertySource

net.sourceforge.pmd.lang.rule.AbstractRule

net.sourceforge.pmd.lang.java.rule.AbstractJavaRule

net.sourceforge.pmd.lang.java.rule.AbstractInefficientZeroCheck

net.sourceforge.pmd.lang.java.rule.bestpractices.UseCollectionIsEmptyRule

All Implemented Interfaces:

JavaParserVisitor, net.sourceforge.pmd.lang.rule.ImmutableLanguage, net.sourceforge.pmd.properties.PropertySource, net.sourceforge.pmd.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.properties.AbstractPropertySource

propertyDescriptors, propertyValuesByDescriptor

Fields inherited from interface net.sourceforge.pmd.Rule

VIOLATION_SUPPRESS_REGEX_DESCRIPTOR, VIOLATION_SUPPRESS_XPATH_DESCRIPTOR

Constructor Summary

Constructors

Constructor	Description
UseCollectionIsEmptyRule()

Method Summary

Modifier and Type	Method	Description
boolean	appliesToClassName(java.lang.String name)
java.util.Map<java.lang.String,java.util.List<java.lang.String>>	getComparisonTargets()	For each relation/equality operator, comparison targets need to define.
boolean	isTargetMethod(JavaNameOccurrence occ)	Determine if we're dealing with .size method
java.lang.Object	visit(ASTPrimarySuffix node, java.lang.Object data)

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

checkNodeAndReport, visit

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, visit, visit, visit, visitAll

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

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

Methods inherited from class net.sourceforge.pmd.properties.AbstractPropertySource

copyPropertyDescriptors, copyPropertyValues, definePropertyDescriptor, dysfunctionReason, getPropertiesByPropertyDescriptor, getProperty, getPropertyDescriptor, getPropertyDescriptors, hasDescriptor, ignoredProperties, setProperty, 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.properties.PropertySource

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

Constructor Detail

UseCollectionIsEmptyRule

public UseCollectionIsEmptyRule()

Method Detail

appliesToClassName

public boolean appliesToClassName(java.lang.String name)

Specified by:

appliesToClassName in class AbstractInefficientZeroCheck

isTargetMethod

public boolean isTargetMethod(JavaNameOccurrence 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 .size, else false

getComparisonTargets

public java.util.Map<java.lang.String,java.util.List<java.lang.String>> getComparisonTargets()

Description copied from class: AbstractInefficientZeroCheck

For each relation/equality operator, comparison targets need to define.

Overrides:

getComparisonTargets in class AbstractInefficientZeroCheck

Returns:

map

visit

public java.lang.Object visit(ASTPrimarySuffix node,
                              java.lang.Object data)

Specified by:

visit in interface JavaParserVisitor

Overrides:

visit in class AbstractJavaRule