Java 6を使用していて、SunのAPIを使用してもかまわない場合は、javacAPIを使用できます。tools.jar
クラスパスに追加する必要があります。
import java.io.IOException;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import javax.tools.JavaCompiler.CompilationTask;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.LineMap;
import com.sun.source.tree.MethodTree;
import com.sun.source.util.JavacTask;
import com.sun.source.util.SourcePositions;
import com.sun.source.util.TreeScanner;
import com.sun.source.util.Trees;
public class MethodFinder {
public static void main(String[] args) {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
DiagnosticCollector<JavaFileObject> diagnosticsCollector = new DiagnosticCollector<JavaFileObject>();
StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnosticsCollector, null, null);
Iterable<? extends JavaFileObject> fileObjects = fileManager.getJavaFileObjects("path/to/Source.java");
CompilationTask task = compiler.getTask(null, fileManager, diagnosticsCollector, null, null, fileObjects);
// Here we switch to Sun-specific APIs
JavacTask javacTask = (JavacTask) task;
SourcePositions sourcePositions = Trees.instance(javacTask).getSourcePositions();
Iterable<? extends CompilationUnitTree> parseResult = null;
try {
parseResult = javacTask.parse();
} catch (IOException e) {
// Parsing failed
e.printStackTrace();
System.exit(0);
}
for (CompilationUnitTree compilationUnitTree : parseResult) {
compilationUnitTree.accept(new MethodLineLogger(compilationUnitTree, sourcePositions), null);
}
}
private static class MethodLineLogger extends TreeScanner<Void, Void> {
private final CompilationUnitTree compilationUnitTree;
private final SourcePositions sourcePositions;
private final LineMap lineMap;
private MethodLineLogger(CompilationUnitTree compilationUnitTree, SourcePositions sourcePositions) {
this.compilationUnitTree = compilationUnitTree;
this.sourcePositions = sourcePositions;
this.lineMap = compilationUnitTree.getLineMap();
}
@Override
public Void visitMethod(MethodTree arg0, Void arg1) {
long startPosition = sourcePositions.getStartPosition(compilationUnitTree, arg0);
long startLine = lineMap.getLineNumber(startPosition);
long endPosition = sourcePositions.getEndPosition(compilationUnitTree, arg0);
long endLine = lineMap.getLineNumber(endPosition);
// Voila!
System.out.println("Found method " + arg0.getName() + " from line " + startLine + " to line " + endLine + ".");
return super.visitMethod(arg0, arg1);
}
}
}