咨询是否存在物理位置转逻辑位置的转换函数及应用场景

Great question! I’ve dealt with this exact need when working with location URIs in tooling that uses resolveLocation() for the forward conversion. Here’s what you need to know:

Built-in Function Options #

First, check if your environment provides a built-in reverse function—many frameworks that include resolveLocation() have a counterpart for the reverse operation:

• Common names for this function include reverseResolveLocation() or toLogicalLocation(). For example, in some Eclipse-based tooling, you can leverage the workspace resource API to map physical project paths back to logical class URIs.
• If you’re working with Eclipse’s resource system, use ResourcesPlugin.getWorkspace().getRoot().findMember(IPath) to locate the IResource from the physical project:// path. Then, you can derive the logical java+class:/// URI by converting the file’s package structure (e.g., mapping src/main/java/com/example/MyClass.java to com.example.MyClass).

Manual Implementation (If No Built-in Function Exists) #

If there’s no pre-built function, you can roll your own conversion with these steps:

1. Parse the physical |project://... string to extract the project name and relative file path.
2. Map the file path to its corresponding class package structure (adjust for your source directory conventions like src/main/java).
3. Construct the |java+class:///... URI from the fully qualified class name.

Here’s a quick code snippet example (Java-like pseudocode):

// Sample physical location input
String physicalLoc = "|project://MyApp/src/main/java/com/example/HelloWorld.java";

// Split and parse the physical path
String[] uriParts = physicalLoc.split("://");
String projectAndPath = uriParts[1];
String projectName = projectAndPath.split("/")[0];
String relativeFilePath = projectAndPath.substring(projectName.length() + 1);

// Convert to logical class URI
String classPackage = relativeFilePath
    .replace("src/main/java/", "") // Adjust this to your source root
    .replace(".java", "")
    .replace("/", ".");
String logicalLoc = "|java+class:///" + classPackage;

// Result: |java+class:///com.example.HelloWorld

Key Notes #

• Make sure to account for different source directories (e.g., src/test/java, target/classes) by adding configurable path mappings.
• For compiled .class files, you might need to use a bytecode library (like ASM) to read the class’s fully qualified name directly from the file, instead of relying on path conventions.

内容的提问来源于stack exchange，提问作者Jorgos Korres