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Java example source code file (TestDocComments.java)
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The TestDocComments.java Java example source code
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 6877202 6986246
* @summary Elements.getDocComment() is not getting JavaDocComments
*/
import com.sun.source.tree.*;
import com.sun.source.util.*;
import java.io.*;
import java.util.*;
import javax.annotation.processing.*;
import javax.lang.model.*;
import javax.lang.model.element.*;
import javax.lang.model.util.*;
import javax.tools.*;
/*
* For a mixture of pre-existing and generated source files, ensure that we can
* get the doc comments.
* The test uses both a standard ElementScanner to find all the elements being
* processed, and a TreeScanner to find all the local and anonymous inner classes
* as well.
* And, because the relevant code paths in the compiler are different for
* command line and JSR 199 invocation, the test covers both ways of invoking the
* compiler.
*/
@SupportedOptions("scan")
@SupportedAnnotationTypes("*")
public class TestDocComments extends AbstractProcessor {
enum CompileKind { API, CMD };
enum ScanKind { TREE, ELEMENT };
// ----- Main test driver: invoke compiler for the various test cases ------
public static void main(String... args) throws Exception {
for (CompileKind ck: CompileKind.values()) {
for (ScanKind sk: ScanKind.values()) {
try {
test(ck, sk);
} catch (IOException e) {
error(e.toString());
}
}
}
if (errors > 0)
throw new Exception(errors + " errors occurred");
}
static void test(CompileKind ck, ScanKind sk) throws IOException {
String testClasses = System.getProperty("test.classes");
String testSrc = System.getProperty("test.src");
File testDir = new File("test." + ck + "." + sk);
testDir.mkdirs();
String[] opts = {
"-d", testDir.getPath(),
"-implicit:none",
"-processor", TestDocComments.class.getName(),
"-processorpath", testClasses,
//"-XprintRounds",
"-Ascan=" + sk
};
File[] files = {
new File(testSrc, "a/First.java")
};
if (ck == CompileKind.API)
test_javac_api(opts, files);
else
test_javac_cmd(opts, files);
}
static void test_javac_api(String[] opts, File[] files) throws IOException {
System.err.println("test javac api: " + Arrays.asList(opts) + " " + Arrays.asList(files));
DiagnosticListener<JavaFileObject> dl = new DiagnosticListener() {
public void report(Diagnostic diagnostic) {
error(diagnostic.toString());
}
};
JavaCompiler c = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fm = c.getStandardFileManager(null, null, null);
Iterable<? extends JavaFileObject> units = fm.getJavaFileObjects(files);
JavacTask t = (JavacTask) c.getTask(null, fm, dl, Arrays.asList(opts), null, units);
t.parse();
t.analyze();
}
static void test_javac_cmd(String[] opts, File[] files) {
System.err.println("test javac cmd: " + Arrays.asList(opts) + " " + Arrays.asList(files));
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
List<String> args = new ArrayList(Arrays.asList(opts));
for (File f: files)
args.add(f.getPath());
int rc = com.sun.tools.javac.Main.compile(args.toArray(new String[args.size()]), pw);
pw.close();
String out = sw.toString();
if (out.length() > 0)
System.err.println(out);
if (rc > 0)
error("Compilation failed: rc=" + rc);
}
static void error(String msg) {
System.err.println(msg);
errors++;
//throw new Error(msg);
}
static int errors;
// ----- Annotation processor: scan for elements and check doc comments ----
Map<String,String> options;
Filer filer;
Messager messager;
Elements elements;
Trees trees;
ScanKind skind;
int round = 0;
@Override
public SourceVersion getSupportedSourceVersion() {
return SourceVersion.latest();
}
@Override
public void init(ProcessingEnvironment pEnv) {
super.init(pEnv);
options = pEnv.getOptions();
filer = pEnv.getFiler();
messager = pEnv.getMessager();
elements = pEnv.getElementUtils();
trees = Trees.instance(processingEnv);
skind = ScanKind.valueOf(options.get("scan"));
}
@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
round++;
// Scan elements using an appropriate scanner, and for each element found,
// call check(Element e) to verify the doc comment on that element
for (Element e: roundEnv.getRootElements()) {
System.err.println("scan " + skind + " " + e.getKind() + " " + e.getSimpleName());
if (skind == ScanKind.TREE) {
new TestTreeScanner().scan(trees.getPath(e), trees);
} else
new TestElementScanner().scan(e);
}
// For a few rounds, generate new source files, so that we can check whether
// doc comments are correctly handled in subsequent processing rounds
final int MAX_ROUNDS = 3;
if (round <= MAX_ROUNDS) {
String pkg = "p";
String currClass = "Gen" + round;
String curr = pkg + "." + currClass;
String next = (round < MAX_ROUNDS) ? (pkg + ".Gen" + (round + 1)) : "z.Last";
StringBuilder text = new StringBuilder();
text.append("package ").append(pkg).append(";\n");
text.append("/** CLASS ").append(currClass).append(" */\n");
text.append("public class ").append(currClass).append(" {\n");
text.append(" /** CONSTRUCTOR <init> **/\n");
text.append(" ").append(currClass).append("() { }\n");
text.append(" /** FIELD x */\n");
text.append(" ").append(next).append(" x;\n");
text.append(" /** METHOD m */\n");
text.append(" void m() { }\n");
text.append("}\n");
try {
JavaFileObject fo = filer.createSourceFile(curr);
Writer out = fo.openWriter();
try {
out.write(text.toString());
} finally {
out.close();
}
} catch (IOException e) {
throw new Error(e);
}
}
return true;
}
/*
* Check that the doc comment on an element is as expected.
* This method is invoked for each element found by the scanners run by process.
*/
void check(Element e) {
System.err.println("Checking " + e);
String dc = elements.getDocComment(e);
System.err.println(" found " + dc);
String expect = (e.getKind() + " " + e.getSimpleName()); // default
Name name = e.getSimpleName();
Element encl = e.getEnclosingElement();
Name enclName = encl.getSimpleName();
ElementKind enclKind = encl.getKind();
switch (e.getKind()) {
case PARAMETER:
case LOCAL_VARIABLE:
// doc comments not retained for these elements
expect = null;
break;
case CONSTRUCTOR:
if (enclName.length() == 0 || enclKind == ElementKind.ENUM) {
// Enum constructor is synthetic
expect = null;
}
break;
case METHOD:
if (enclKind == ElementKind.ENUM
&& (name.contentEquals("values") || name.contentEquals("valueOf"))) {
// synthetic enum methods
expect = null;
}
break;
case CLASS:
if (e.getSimpleName().length() == 0) {
// anon inner class
expect = null;
}
break;
}
System.err.println(" expect " + expect);
if (dc == null ? expect == null : dc.trim().equals(expect))
return;
if (dc == null)
messager.printMessage(Diagnostic.Kind.ERROR, "doc comment is null", e);
else {
messager.printMessage(Diagnostic.Kind.ERROR,
"unexpected comment: \"" + dc + "\", expected \"" + expect + "\"", e);
}
}
// ----- Scanners to find elements -----------------------------------------
class TestElementScanner extends ElementScanner7<Void, Void> {
@Override
public Void visitExecutable(ExecutableElement e, Void _) {
check(e);
return super.visitExecutable(e, _);
}
@Override
public Void visitType(TypeElement e, Void _) {
check(e);
return super.visitType(e, _);
}
@Override
public Void visitVariable(VariableElement e, Void _) {
check(e);
return super.visitVariable(e, _);
}
}
class TestTreeScanner extends TreePathScanner<Void,Trees> {
@Override
public Void visitClass(ClassTree tree, Trees trees) {
check(trees.getElement(getCurrentPath()));
return super.visitClass(tree, trees);
}
@Override
public Void visitMethod(MethodTree tree, Trees trees) {
check(trees.getElement(getCurrentPath()));
return super.visitMethod(tree, trees);
}
@Override
public Void visitVariable(VariableTree tree, Trees trees) {
check(trees.getElement(getCurrentPath()));
return super.visitVariable(tree, trees);
}
}
}
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