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.AbstractJavaRulechainRule

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

All Implemented Interfaces:

net.sourceforge.pmd.lang.ast.AstVisitor, JavaVisitor, net.sourceforge.pmd.lang.rule.Rule, net.sourceforge.pmd.properties.PropertySource

public class UseCollectionIsEmptyRule
extends AbstractJavaRulechainRule

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 interface net.sourceforge.pmd.lang.rule.Rule

VIOLATION_SUPPRESS_REGEX_DESCRIPTOR, VIOLATION_SUPPRESS_XPATH_DESCRIPTOR

Constructor Summary

Constructors

Constructor	Description
UseCollectionIsEmptyRule()

Method Summary

Modifier and Type	Method	Description
Object	visit(ASTMethodCall call, Object data)

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

buildTargetSelector, visitJavaNode

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

apply, visitNode

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

addExample, asCtx, deepCopy, end, equals, getDescription, getExamples, getExternalInfoUrl, getLanguage, getMaximumLanguageVersion, getMessage, getMinimumLanguageVersion, getName, getPriority, getPropertySourceType, getRuleClass, getRuleSetName, getSince, getTargetSelector, hashCode, isDeprecated, setDeprecated, setDescription, setExternalInfoUrl, setLanguage, setMaximumLanguageVersion, setMessage, setMinimumLanguageVersion, setName, setPriority, setRuleClass, setRuleSetName, setSince, start

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

definePropertyDescriptor, getOverriddenPropertiesByPropertyDescriptor, getOverriddenPropertyDescriptors, getPropertiesByPropertyDescriptor, getProperty, getPropertyDescriptor, getPropertyDescriptors, hasDescriptor, isPropertyOverridden, setProperty

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sourceforge.pmd.lang.ast.AstVisitor

cannotVisit

Methods inherited from interface net.sourceforge.pmd.lang.java.ast.JavaVisitor

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from interface net.sourceforge.pmd.properties.PropertySource

definePropertyDescriptor, dysfunctionReason, getOverriddenPropertiesByPropertyDescriptor, getOverriddenPropertyDescriptors, getPropertiesByPropertyDescriptor, getProperty, getPropertyDescriptor, getPropertyDescriptors, hasDescriptor, isPropertyOverridden, setProperty

Methods inherited from interface net.sourceforge.pmd.lang.rule.Rule

initialize

Constructor Details

UseCollectionIsEmptyRule

public UseCollectionIsEmptyRule()

Method Details

visit

public Object visit(ASTMethodCall call,
 Object data)