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java.lang.Objectnet.sourceforge.pmd.ast.JavaParserVisitorAdapter
net.sourceforge.pmd.AbstractRule
net.sourceforge.pmd.rules.AbstractInefficientZeroCheck
net.sourceforge.pmd.rules.strings.InefficientEmptyStringCheck
This rule finds code which inefficiently determines empty strings. This code
if(str.trim().length()==0){....
is quite inefficient as trim() causes a new String to be created.
Smarter code to check for an empty string would be:
Character.isWhitespace(str.charAt(i));
| Field Summary |
| Fields inherited from class net.sourceforge.pmd.AbstractRule |
description, example, externalInfoUrl, include, message, name, priority, properties, ruleSetName, usesDFA, usesTypeResolution |
| Fields inherited from interface net.sourceforge.pmd.Rule |
LOWEST_PRIORITY, PRIORITIES |
| Constructor Summary | |
InefficientEmptyStringCheck()
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| Method Summary | |
boolean |
appliesToClassName(java.lang.String name)
|
boolean |
isTargetMethod(NameOccurrence occ)
Determine if we're dealing with String.length method |
| Methods inherited from class net.sourceforge.pmd.rules.AbstractInefficientZeroCheck |
visit |
| Methods inherited from class net.sourceforge.pmd.ast.JavaParserVisitorAdapter |
visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, 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 class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public InefficientEmptyStringCheck()
| Method Detail |
public boolean isTargetMethod(NameOccurrence occ)
isTargetMethod in class AbstractInefficientZeroCheckocc - The name occurance
public boolean appliesToClassName(java.lang.String name)
appliesToClassName in class AbstractInefficientZeroCheck
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