我正在尝试检测是否使用了StringBuffer，以及是否调用了append方法。所以，我的方法如下。但我还没有找到解决方案。
期待寻求帮助。
xPath准备好了：
//PrimaryExpression/PrimaryPrefix/Name[contains(@Image,'append') and contains(@Image,
//LocalVariableDeclaration[descendant::ClassOrInterfaceType[@Image='StringBuffer']]
/VariableDeclarator/VariableDeclaratorId/@Image)]
测试输入
public class pmdTestSomeCollection {
StringBuffer sb11 = new StringBuffer("abcdeeee");
public static void main(String args[]) {
StringBuffer sb1 = new StringBuffer("abcde");
sb1.append("abcdefghij");
StringBuffer sb2 = sb1.reverse();
sb2.append("A");
System.out.println(sb1);
System.out.println(sb2);
}
}
生成的XML（抽象语法树）
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<CompilationUnit BeginColumn="1" BeginLine="1" EndColumn="1" EndLine="10" Image="" Label="" declarationsAreInDefaultPackage="true">
<TypeDeclaration BeginColumn="1" BeginLine="1" EndColumn="1" EndLine="10" Image="" Label="">
<ClassOrInterfaceDeclaration Abstract="false" BeginColumn="8" BeginLine="1" EndColumn="1" EndLine="10" Final="false" Image="pmdTestSomeCollection" Interface="false" Label="" Modifiers="1" Native="false" Nested="false" PackagePrivate="false" Private="false" Protected="false" Public="true" Static="false" Strictfp="false" Synchronized="false" Transient="false" Volatile="false">
<ClassOrInterfaceBody BeginColumn="36" BeginLine="1" EndColumn="1" EndLine="10" Image="" Label="">
<ClassOrInterfaceBodyDeclaration AnonymousInnerClass="false" BeginColumn="1" BeginLine="2" EndColumn="49" EndLine="2" EnumChild="false" Image="" Label="">
<FieldDeclaration Abstract="false" Array="false" ArrayDepth="0" BeginColumn="1" BeginLine="2" EndColumn="49" EndLine="2" Final="false" Image="" InterfaceMember="false" Label="" Modifiers="0" Native="false" PackagePrivate="true" Private="false" Protected="false" Public="false" Static="false" Strictfp="false" Synchronized="false" SyntacticallyFinal="false" SyntacticallyPublic="false" SyntacticallyStatic="false" Transient="false" VariableName="sb11" Volatile="false">
<Type Array="false" ArrayDepth="0" BeginColumn="1" BeginLine="2" EndColumn="12" EndLine="2" Image="" Label="" TypeImage="StringBuffer">
<ReferenceType Array="false" ArrayDepth="0" BeginColumn="1" BeginLine="2" EndColumn="12" EndLine="2" Image="" Label="">
<ClassOrInterfaceType BeginColumn="1" BeginLine="2" EndColumn="12" EndLine="2" Image="StringBuffer" Label=""/>
</ReferenceType>
</Type>
<VariableDeclarator BeginColumn="14" BeginLine="2" EndColumn="48" EndLine="2" Image="" Label="">
<VariableDeclaratorId Array="false" ArrayDepth="0" BeginColumn="14" BeginLine="2" EndColumn="17" EndLine="2" ExceptionBlockParameter="false" Image="sb11" Label=""/>
<VariableInitializer BeginColumn="21" BeginLine="2" EndColumn="48" EndLine="2" Image="" Label="">
<Expression BeginColumn="21" BeginLine="2" EndColumn="48" EndLine="2" Image="" Label="">
<PrimaryExpression BeginColumn="21" BeginLine="2" EndColumn="48" EndLine="2" Image="" Label="">
<PrimaryPrefix BeginColumn="21" BeginLine="2" EndColumn="48" EndLine="2" Image="" Label="" SuperModifier="false" ThisModifier="false">
<AllocationExpression BeginColumn="21" BeginLine="2" EndColumn="48" EndLine="2" Image="" Label="">
<ClassOrInterfaceType BeginColumn="25" BeginLine="2" EndColumn="36" EndLine="2" Image="StringBuffer" Label=""/>
<Arguments ArgumentCount="1" BeginColumn="37" BeginLine="2" EndColumn="48" EndLine="2" Image="" Label="">
<ArgumentList BeginColumn="38" BeginLine="2" EndColumn="47" EndLine="2" Image="" Label="">
<Expression BeginColumn="38" BeginLine="2" EndColumn="47" EndLine="2" Image="" Label="">
<PrimaryExpression BeginColumn="38" BeginLine="2" EndColumn="47" EndLine="2" Image="" Label="">
<PrimaryPrefix BeginColumn="38" BeginLine="2" EndColumn="47" EndLine="2" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Literal BeginColumn="38" BeginLine="2" CharLiteral="false" EndColumn="47" EndLine="2" FloatLiteral="false" Image=""abcdeeee"" IntLiteral="false" Label="" SingleCharacterStringLiteral="false" StringLiteral="true"/>
</PrimaryPrefix>
</PrimaryExpression>
</Expression>
</ArgumentList>
</Arguments>
</AllocationExpression>
</PrimaryPrefix>
</PrimaryExpression>
</Expression>
</VariableInitializer>
</VariableDeclarator>
</FieldDeclaration>
</ClassOrInterfaceBodyDeclaration>
<ClassOrInterfaceBodyDeclaration AnonymousInnerClass="false" BeginColumn="3" BeginLine="3" EndColumn="3" EndLine="9" EnumChild="false" Image="" Label="">
<MethodDeclaration Abstract="false" BeginColumn="17" BeginLine="3" EndColumn="3" EndLine="9" Final="false" Image="" InterfaceMember="false" Label="" MethodName="main" Modifiers="17" Native="false" PackagePrivate="false" Private="false" Protected="false" Public="true" Static="true" Strictfp="false" Synchronized="false" SyntacticallyAbstract="false" SyntacticallyPublic="true" Transient="false" Void="true" Volatile="false">
<ResultType BeginColumn="17" BeginLine="3" EndColumn="20" EndLine="3" Image="" Label="" Void="true" returnsArray="false"/>
<MethodDeclarator BeginColumn="22" BeginLine="3" EndColumn="40" EndLine="3" Image="main" Label="" ParameterCount="1">
<FormalParameters BeginColumn="26" BeginLine="3" EndColumn="40" EndLine="3" Image="" Label="" ParameterCount="1">
<FormalParameter Abstract="false" Array="true" ArrayDepth="1" BeginColumn="27" BeginLine="3" EndColumn="39" EndLine="3" Final="false" Image="" Label="" Modifiers="0" Native="false" PackagePrivate="true" Private="false" Protected="false" Public="false" Static="false" Strictfp="false" Synchronized="false" Transient="false" Varargs="false" Volatile="false">
<Type Array="false" ArrayDepth="0" BeginColumn="27" BeginLine="3" EndColumn="32" EndLine="3" Image="" Label="" TypeImage="String">
<ReferenceType Array="false" ArrayDepth="0" BeginColumn="27" BeginLine="3" EndColumn="32" EndLine="3" Image="" Label="">
<ClassOrInterfaceType BeginColumn="27" BeginLine="3" EndColumn="32" EndLine="3" Image="String" Label=""/>
</ReferenceType>
</Type>
<VariableDeclaratorId Array="true" ArrayDepth="1" BeginColumn="34" BeginLine="3" EndColumn="39" EndLine="3" ExceptionBlockParameter="false" Image="args" Label=""/>
</FormalParameter>
</FormalParameters>
</MethodDeclarator>
<Block BeginColumn="42" BeginLine="3" EndColumn="3" EndLine="9" Image="" Label="" containsComment="false">
<BlockStatement Allocation="true" BeginColumn="5" BeginLine="4" EndColumn="49" EndLine="4" Image="" Label="">
<LocalVariableDeclaration Abstract="false" Array="false" ArrayDepth="0" BeginColumn="5" BeginLine="4" EndColumn="48" EndLine="4" Final="false" Image="" Label="" Modifiers="0" Native="false" PackagePrivate="true" Private="false" Protected="false" Public="false" Static="false" Strictfp="false" Synchronized="false" Transient="false" VariableName="sb1" Volatile="false">
<Type Array="false" ArrayDepth="0" BeginColumn="5" BeginLine="4" EndColumn="16" EndLine="4" Image="" Label="" TypeImage="StringBuffer">
<ReferenceType Array="false" ArrayDepth="0" BeginColumn="5" BeginLine="4" EndColumn="16" EndLine="4" Image="" Label="">
<ClassOrInterfaceType BeginColumn="5" BeginLine="4" EndColumn="16" EndLine="4" Image="StringBuffer" Label=""/>
</ReferenceType>
</Type>
<VariableDeclarator BeginColumn="18" BeginLine="4" EndColumn="48" EndLine="4" Image="" Label="">
<VariableDeclaratorId Array="false" ArrayDepth="0" BeginColumn="18" BeginLine="4" EndColumn="20" EndLine="4" ExceptionBlockParameter="false" Image="sb1" Label=""/>
<VariableInitializer BeginColumn="24" BeginLine="4" EndColumn="48" EndLine="4" Image="" Label="">
<Expression BeginColumn="24" BeginLine="4" EndColumn="48" EndLine="4" Image="" Label="">
<PrimaryExpression BeginColumn="24" BeginLine="4" EndColumn="48" EndLine="4" Image="" Label="">
<PrimaryPrefix BeginColumn="24" BeginLine="4" EndColumn="48" EndLine="4" Image="" Label="" SuperModifier="false" ThisModifier="false">
<AllocationExpression BeginColumn="24" BeginLine="4" EndColumn="48" EndLine="4" Image="" Label="">
<ClassOrInterfaceType BeginColumn="28" BeginLine="4" EndColumn="39" EndLine="4" Image="StringBuffer" Label=""/>
<Arguments ArgumentCount="1" BeginColumn="40" BeginLine="4" EndColumn="48" EndLine="4" Image="" Label="">
<ArgumentList BeginColumn="41" BeginLine="4" EndColumn="47" EndLine="4" Image="" Label="">
<Expression BeginColumn="41" BeginLine="4" EndColumn="47" EndLine="4" Image="" Label="">
<PrimaryExpression BeginColumn="41" BeginLine="4" EndColumn="47" EndLine="4" Image="" Label="">
<PrimaryPrefix BeginColumn="41" BeginLine="4" EndColumn="47" EndLine="4" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Literal BeginColumn="41" BeginLine="4" CharLiteral="false" EndColumn="47" EndLine="4" FloatLiteral="false" Image=""abcde"" IntLiteral="false" Label="" SingleCharacterStringLiteral="false" StringLiteral="true"/>
</PrimaryPrefix>
</PrimaryExpression>
</Expression>
</ArgumentList>
</Arguments>
</AllocationExpression>
</PrimaryPrefix>
</PrimaryExpression>
</Expression>
</VariableInitializer>
</VariableDeclarator>
</LocalVariableDeclaration>
</BlockStatement>
<BlockStatement Allocation="false" BeginColumn="5" BeginLine="5" EndColumn="29" EndLine="5" Image="" Label="">
<Statement BeginColumn="5" BeginLine="5" EndColumn="29" EndLine="5" Image="" Label="">
<StatementExpression BeginColumn="5" BeginLine="5" EndColumn="28" EndLine="5" Image="" Label="">
<PrimaryExpression BeginColumn="5" BeginLine="5" EndColumn="28" EndLine="5" Image="" Label="">
<PrimaryPrefix BeginColumn="5" BeginLine="5" EndColumn="14" EndLine="5" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Name BeginColumn="5" BeginLine="5" EndColumn="14" EndLine="5" Image="sb1.append" Label=""/>
</PrimaryPrefix>
<PrimarySuffix ArgumentCount="1" Arguments="true" ArrayDereference="false" BeginColumn="15" BeginLine="5" EndColumn="28" EndLine="5" Image="" Label="">
<Arguments ArgumentCount="1" BeginColumn="15" BeginLine="5" EndColumn="28" EndLine="5" Image="" Label="">
<ArgumentList BeginColumn="16" BeginLine="5" EndColumn="27" EndLine="5" Image="" Label="">
<Expression BeginColumn="16" BeginLine="5" EndColumn="27" EndLine="5" Image="" Label="">
<PrimaryExpression BeginColumn="16" BeginLine="5" EndColumn="27" EndLine="5" Image="" Label="">
<PrimaryPrefix BeginColumn="16" BeginLine="5" EndColumn="27" EndLine="5" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Literal BeginColumn="16" BeginLine="5" CharLiteral="false" EndColumn="27" EndLine="5" FloatLiteral="false" Image=""abcdefghij"" IntLiteral="false" Label="" SingleCharacterStringLiteral="false" StringLiteral="true"/>
</PrimaryPrefix>
</PrimaryExpression>
</Expression>
</ArgumentList>
</Arguments>
</PrimarySuffix>
</PrimaryExpression>
</StatementExpression>
</Statement>
</BlockStatement>
<BlockStatement Allocation="false" BeginColumn="5" BeginLine="6" EndColumn="37" EndLine="6" Image="" Label="">
<LocalVariableDeclaration Abstract="false" Array="false" ArrayDepth="0" BeginColumn="5" BeginLine="6" EndColumn="36" EndLine="6" Final="false" Image="" Label="" Modifiers="0" Native="false" PackagePrivate="true" Private="false" Protected="false" Public="false" Static="false" Strictfp="false" Synchronized="false" Transient="false" VariableName="sb2" Volatile="false">
<Type Array="false" ArrayDepth="0" BeginColumn="5" BeginLine="6" EndColumn="16" EndLine="6" Image="" Label="" TypeImage="StringBuffer">
<ReferenceType Array="false" ArrayDepth="0" BeginColumn="5" BeginLine="6" EndColumn="16" EndLine="6" Image="" Label="">
<ClassOrInterfaceType BeginColumn="5" BeginLine="6" EndColumn="16" EndLine="6" Image="StringBuffer" Label=""/>
</ReferenceType>
</Type>
<VariableDeclarator BeginColumn="18" BeginLine="6" EndColumn="36" EndLine="6" Image="" Label="">
<VariableDeclaratorId Array="false" ArrayDepth="0" BeginColumn="18" BeginLine="6" EndColumn="20" EndLine="6" ExceptionBlockParameter="false" Image="sb2" Label=""/>
<VariableInitializer BeginColumn="24" BeginLine="6" EndColumn="36" EndLine="6" Image="" Label="">
<Expression BeginColumn="24" BeginLine="6" EndColumn="36" EndLine="6" Image="" Label="">
<PrimaryExpression BeginColumn="24" BeginLine="6" EndColumn="36" EndLine="6" Image="" Label="">
<PrimaryPrefix BeginColumn="24" BeginLine="6" EndColumn="34" EndLine="6" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Name BeginColumn="24" BeginLine="6" EndColumn="34" EndLine="6" Image="sb1.reverse" Label=""/>
</PrimaryPrefix>
<PrimarySuffix ArgumentCount="0" Arguments="true" ArrayDereference="false" BeginColumn="35" BeginLine="6" EndColumn="36" EndLine="6" Image="" Label="">
<Arguments ArgumentCount="0" BeginColumn="35" BeginLine="6" EndColumn="36" EndLine="6" Image="" Label=""/>
</PrimarySuffix>
</PrimaryExpression>
</Expression>
</VariableInitializer>
</VariableDeclarator>
</LocalVariableDeclaration>
</BlockStatement>
<BlockStatement Allocation="false" BeginColumn="5" BeginLine="7" EndColumn="28" EndLine="7" Image="" Label="">
<Statement BeginColumn="5" BeginLine="7" EndColumn="28" EndLine="7" Image="" Label="">
<StatementExpression BeginColumn="5" BeginLine="7" EndColumn="27" EndLine="7" Image="" Label="">
<PrimaryExpression BeginColumn="5" BeginLine="7" EndColumn="27" EndLine="7" Image="" Label="">
<PrimaryPrefix BeginColumn="5" BeginLine="7" EndColumn="22" EndLine="7" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Name BeginColumn="5" BeginLine="7" EndColumn="22" EndLine="7" Image="System.out.println" Label=""/>
</PrimaryPrefix>
<PrimarySuffix ArgumentCount="1" Arguments="true" ArrayDereference="false" BeginColumn="23" BeginLine="7" EndColumn="27" EndLine="7" Image="" Label="">
<Arguments ArgumentCount="1" BeginColumn="23" BeginLine="7" EndColumn="27" EndLine="7" Image="" Label="">
<ArgumentList BeginColumn="24" BeginLine="7" EndColumn="26" EndLine="7" Image="" Label="">
<Expression BeginColumn="24" BeginLine="7" EndColumn="26" EndLine="7" Image="" Label="">
<PrimaryExpression BeginColumn="24" BeginLine="7" EndColumn="26" EndLine="7" Image="" Label="">
<PrimaryPrefix BeginColumn="24" BeginLine="7" EndColumn="26" EndLine="7" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Name BeginColumn="24" BeginLine="7" EndColumn="26" EndLine="7" Image="sb1" Label=""/>
</PrimaryPrefix>
</PrimaryExpression>
</Expression>
</ArgumentList>
</Arguments>
</PrimarySuffix>
</PrimaryExpression>
</StatementExpression>
</Statement>
</BlockStatement>
<BlockStatement Allocation="false" BeginColumn="5" BeginLine="8" EndColumn="28" EndLine="8" Image="" Label="">
<Statement BeginColumn="5" BeginLine="8" EndColumn="28" EndLine="8" Image="" Label="">
<StatementExpression BeginColumn="5" BeginLine="8" EndColumn="27" EndLine="8" Image="" Label="">
<PrimaryExpression BeginColumn="5" BeginLine="8" EndColumn="27" EndLine="8" Image="" Label="">
<PrimaryPrefix BeginColumn="5" BeginLine="8" EndColumn="22" EndLine="8" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Name BeginColumn="5" BeginLine="8" EndColumn="22" EndLine="8" Image="System.out.println" Label=""/>
</PrimaryPrefix>
<PrimarySuffix ArgumentCount="1" Arguments="true" ArrayDereference="false" BeginColumn="23" BeginLine="8" EndColumn="27" EndLine="8" Image="" Label="">
<Arguments ArgumentCount="1" BeginColumn="23" BeginLine="8" EndColumn="27" EndLine="8" Image="" Label="">
<ArgumentList BeginColumn="24" BeginLine="8" EndColumn="26" EndLine="8" Image="" Label="">
<Expression BeginColumn="24" BeginLine="8" EndColumn="26" EndLine="8" Image="" Label="">
<PrimaryExpression BeginColumn="24" BeginLine="8" EndColumn="26" EndLine="8" Image="" Label="">
<PrimaryPrefix BeginColumn="24" BeginLine="8" EndColumn="26" EndLine="8" Image="" Label="" SuperModifier="false" ThisModifier="false">
<Name BeginColumn="24" BeginLine="8" EndColumn="26" EndLine="8" Image="sb2" Label=""/>
</PrimaryPrefix>
</PrimaryExpression>
</Expression>
</ArgumentList>
</Arguments>
</PrimarySuffix>
</PrimaryExpression>
</StatementExpression>
</Statement>
</BlockStatement>
</Block>
</MethodDeclaration>
</ClassOrInterfaceBodyDeclaration>
</ClassOrInterfaceBody>
</ClassOrInterfaceDeclaration>
</TypeDeclaration>
</CompilationUnit>
答案 0 :(得分：0)
我认为它不可能，它适用于任何方法中声明的一个局部变量和任何类中的第一个参数。这里的一个大问题是，一旦您进入谓词并指定了将返回多个节点的路径，谓词将仅应用于第一个节点。
例如，在下面的代码中，// LocalVariableDeclaration /.../VariableDeclaratorId应该与所有局部变量进行比较，但它只匹配与String缓冲区谓词匹配的第一个LocalVariable。在XPath 2.0中有一个for构造支持这些类型的查询，但PMD目前还不支持它。
... and contains(@Image,
//LocalVariableDeclaration[descendant::ClassOrInterfaceType[@Image='StringBuffer']]
/VariableDeclarator/VariableDeclaratorId/@Image)]