使用JDT获取startPosition和方法调用的长度

问题描述

假设我有这个Java源代码。如何获取extractMethod（amount）调用的startPosition和length？

  package smcho; 
 
 public class Extract {
 String _name =; 
 
 public int extractedMethod（int amount）
 {
 .... 
} 
 
 public int getValue（int amount）{
 if（amount> 10）{
 int z = extractedMethod（amount）; 
 return z; 
} 
 .... 
} 
  

我可以使用六位观众查找开始位置为0x1FA，长度为len（extracted（method））== 17，但我想使用JDT以编程方式执行。

一旦我可以获得CompilationUnit，但是我需要知道如何获取CompilationUnit中的调用引用。

  IWorkspaceRoot root = ResourcesPlugin.getWorkspace（）。getRoot（）; 
 IProject orig = root.getProject（this.projectName）; 
 orig.open（pm）; 
 javaProject = JavaCore.create（orig）; 
 IType type = this.javaProject.findType（this.className）; 
 ICompilationUnit unit = type.getCompilationUnit（）; 
 ASTParser parser = ASTParser.newParser（AST.JLS3）; 
 parser.setSource（unit）; 
 parser.setResolveBindings（true）; 
 CompilationUnit cunit =（CompilationUnit）parser.createAST（null）; 
 
 ASTNode root = parser.createAST（null）; 
 
 root.accept（new ASTVisitor（）{
 public bool visit（...）
}）; 
  

解决方案

这是适用于我的代码。 - 如何在JDT / ASTVisitor（）中存储值？

  public void setPositionFinder（String methodName）throws JavaModelException 
 {
 // findMethod（methodName）; 
 IType type = this.javaProject.findType（this.className）; 
 ICompilationUnit unit = type.getCompilationUnit（）; 
 ASTParser parser = ASTParser.newParser（AST.JLS3）; 
 parser.setSource（unit）; 
 parser.setResolveBindings（true）; 
 CompilationUnit cunit =（CompilationUnit）parser.createAST（null）; 
 // ASTNode root = parser.createAST（null）; 
 
 final String name = this.newMethodName; 
 
 cunit.accept（new ASTVisitor（）{
 public boolean visit（MethodInvocation methodInvocation）
 {
 String methodName = methodInvocation.getName（）。toString（）; 
 System.out.println（methodName）; 
 if（methodName.equals（name））
 {
 startPosition = methodInvocation.getStartPosition（）; 
 length = methodInvocation .getLength（）; 
 System.out.printf（startPosition％d  -  Length％d，startPosition，length）; 
} 
 return false; 
} 
}）; 
} 
  

Let's say I have this Java source code. How can I get the startPosition and length of "extractedMethod(amount)" invocation?

package smcho;

public class Extract {
String _name = "";

public int extractedMethod(int amount)
{
    ....
}

public int getValue(int amount) {
    if (amount > 10) {
    int z = extractedMethod(amount);
    return z;
    }
    ....
}

I could use hexa viewers to find the start position is 0x1FA and the length is len("extracted(method)") == 17, but I'd like to do it programmatically using JDT.

Once I could get the CompilationUnit, but I need to know how to get the invocation reference in that CompilationUnit.

IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
IProject orig = root.getProject(this.projectName);
orig.open(pm);
javaProject = JavaCore.create(orig);
IType type = this.javaProject.findType(this.className);
ICompilationUnit unit = type.getCompilationUnit();
ASTParser parser = ASTParser.newParser(AST.JLS3);
parser.setSource(unit);
parser.setResolveBindings(true);
CompilationUnit cunit = (CompilationUnit) parser.createAST(null);

ASTNode root = parser.createAST(null);

root.accept(new ASTVisitor() {
    public bool visit(...)
});

解决方案

This is the code that works for me. - How can I store values inside JDT/ASTVisitor()?

public void setPositionFinder(String methodName) throws JavaModelException
{
    //findMethod(methodName);
    IType type = this.javaProject.findType(this.className);
    ICompilationUnit unit = type.getCompilationUnit();
    ASTParser parser = ASTParser.newParser(AST.JLS3);
    parser.setSource(unit);
    parser.setResolveBindings(true);
    CompilationUnit cunit = (CompilationUnit) parser.createAST(null);
    //ASTNode root = parser.createAST(null);

    final String name = this.newMethodName;

    cunit.accept(new ASTVisitor() {
        public boolean visit(MethodInvocation methodInvocation)
        {
            String methodName = methodInvocation.getName().toString();
            System.out.println(methodName);
            if (methodName.equals(name))
            {
                startPosition = methodInvocation.getStartPosition();
                length = methodInvocation.getLength();
                System.out.printf("startPosition %d - Length %d", startPosition, length);       
            }
            return false;
        }
    });
}

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