Parse and forward JavaC 'Note:' level messages

Theses messages can be generated by annotation processors using
`printMessage(Diagnostic.Kind.NOTE, "...")`.

Author: mensinda

plexus-compiler-test/src/main/java/org/codehaus/plexus/compiler/AbstractCompilerTest.java

@@ -43,6 +43,7 @@
 import org.apache.maven.artifact.versioning.VersionRange;
 import org.apache.maven.settings.Settings;
 import org.apache.maven.settings.io.xpp3.SettingsXpp3Reader;
+import org.codehaus.plexus.compiler.CompilerMessage.Kind;
 import org.codehaus.plexus.testing.PlexusTest;
 import org.codehaus.plexus.util.FileUtils;
 import org.codehaus.plexus.util.ReaderFactory;
@@ -144,25 +145,24 @@ public void testCompilingSources() throws Exception {
 
         int numCompilerErrors = compilerErrorCount(messages);
 
-        int numCompilerWarnings = messages.size() - numCompilerErrors;
+        int numCompilerWarnings = compilerWarningCount(messages);
 
-        int expectedErrors = expectedErrors();
+        int numCompilerNotes = compilerNoteCount(messages);
 
+        int expectedErrors = expectedErrors();
         if (expectedErrors != numCompilerErrors) {
             System.out.println(numCompilerErrors + " error(s) found:");
             List<String> errors = new ArrayList<>();
-            for (CompilerMessage error : messages) {
-                if (!error.isError()) {
+            for (CompilerMessage msg : messages) {
+                if (msg.getKind() != Kind.ERROR) {
                     continue;
                 }
-
                 System.out.println("----");
-                System.out.println(error.getFile());
-                System.out.println(error.getMessage());
+                System.out.println(msg.getFile());
+                System.out.println(msg.getMessage());
                 System.out.println("----");
-                errors.add(error.getMessage());
+                errors.add(msg.getMessage());
             }
-
             assertThat(
                     "Wrong number of compilation errors (" + numCompilerErrors + "/" + expectedErrors //
                             + ") : " + displayLines(errors),
@@ -174,18 +174,16 @@ public void testCompilingSources() throws Exception {
         if (expectedWarnings != numCompilerWarnings) {
             List<String> warnings = new ArrayList<>();
             System.out.println(numCompilerWarnings + " warning(s) found:");
-            for (CompilerMessage error : messages) {
-                if (error.isError()) {
+            for (CompilerMessage msg : messages) {
+                if (msg.getKind() != Kind.WARNING && msg.getKind() != Kind.MANDATORY_WARNING) {
                     continue;
                 }
-
                 System.out.println("----");
-                System.out.println(error.getFile());
-                System.out.println(error.getMessage());
+                System.out.println(msg.getFile());
+                System.out.println(msg.getMessage());
                 System.out.println("----");
-                warnings.add(error.getMessage());
+                warnings.add(msg.getMessage());
             }
-
             assertThat(
                     "Wrong number ("
                             + numCompilerWarnings + "/" + expectedWarnings + ") of compilation warnings: "
@@ -194,6 +192,28 @@ public void testCompilingSources() throws Exception {
                     is(expectedWarnings));
         }
 
+        int expectedNotes = expectedNotes();
+        if (expectedNotes != numCompilerNotes) {
+            List<String> notes = new ArrayList<>();
+            System.out.println(numCompilerWarnings + " notes(s) found:");
+            for (CompilerMessage msg : messages) {
+                if (msg.getKind() != Kind.NOTE) {
+                    continue;
+                }
+                System.out.println("----");
+                System.out.println(msg.getFile());
+                System.out.println(msg.getMessage());
+                System.out.println("----");
+                notes.add(msg.getMessage());
+            }
+            assertThat(
+                    "Wrong number ("
+                            + numCompilerNotes + "/" + expectedNotes + ") of compilation notes: "
+                            + displayLines(notes),
+                    numCompilerNotes,
+                    is(expectedNotes));
+        }
+
         assertThat(
                 files, containsInAnyOrder(normalizePaths(expectedOutputFiles()).toArray(new String[0])));
     }
@@ -269,14 +289,26 @@ private List<String> normalizePaths(Collection<String> relativePaths) {
                 .collect(Collectors.toList());
     }
 
-    protected int compilerErrorCount(List<CompilerMessage> messages) {
-        int count = 0;
+    private int compilerErrorCount(List<CompilerMessage> messages) {
+        return countKind(messages, Kind.ERROR);
+    }
+
+    private int compilerWarningCount(List<CompilerMessage> messages) {
+        return messages.size() - (compilerErrorCount(messages) + compilerNoteCount(messages));
+    }
+
+    private int compilerNoteCount(List<CompilerMessage> messages) {
+        return countKind(messages, Kind.NOTE);
+    }
 
+    private int countKind(List<CompilerMessage> messages, Kind kind) {
+        int c = 0;
         for (CompilerMessage message : messages) {
-            count += message.isError() ? 1 : 0;
+            if (message.getKind() == kind) {
+                c++;
+            }
         }
-
-        return count;
+        return c;
     }
 
     protected int expectedErrors() {
@@ -287,6 +319,10 @@ protected int expectedWarnings() {
         return 0;
     }
 
+    protected int expectedNotes() {
+        return 0;
+    }
+
     protected Collection<String> expectedOutputFiles() {
         return Collections.emptyList();
     }

plexus-compilers/plexus-compiler-javac-errorprone/src/test/java/org/codehaus/plexus/compiler/javac/JavacErrorProneCompilerTest.java

@@ -17,10 +17,11 @@ protected int expectedWarnings() {
         String javaVersion = getJavaVersion();
         if (javaVersion.startsWith("1.8")) {
             return 1;
-        } else if (javaVersion.contains("18") || javaVersion.contains("19") || javaVersion.contains("20")) {
+        } else if (javaVersion.contains("18")
+                || javaVersion.contains("19")
+                || javaVersion.contains("20")
+                || javaVersion.contains("21")) {
             return 5;
-        } else if (javaVersion.contains("21")) {
-            return 6;
         }
         return 2;
     }
@@ -30,6 +31,15 @@ protected int expectedErrors() {
         return 1;
     }
 
+    @Override
+    protected int expectedNotes() {
+        String javaVersion = getJavaVersion();
+        if (javaVersion.contains("21")) {
+            return 1;
+        }
+        return 0;
+    }
+
     @Override
     public String getSourceVersion() {
         return "1.8";

plexus-compilers/plexus-compiler-javac/src/main/java/org/codehaus/plexus/compiler/javac/JavacCompiler.java

@@ -697,7 +697,7 @@ static List<CompilerMessage> parseModernStream(int exitCode, BufferedReader inpu
             } else if ((buffer.length() == 0) && line.startsWith("warning: ")) {
                 errors.add(new CompilerMessage(line, CompilerMessage.Kind.WARNING));
             } else if ((buffer.length() == 0) && isNote(line)) {
-                // skip, JDK 1.5 telling us deprecated APIs are used but -Xlint:deprecation isn't set
+                errors.add(new CompilerMessage(line, CompilerMessage.Kind.NOTE));
             } else if ((buffer.length() == 0) && isMisc(line)) {
                 // verbose output was set
                 errors.add(new CompilerMessage(line, CompilerMessage.Kind.OTHER));

plexus-compilers/plexus-compiler-javac/src/test/java/org/codehaus/plexus/compiler/javac/AbstractJavacCompilerTest.java

@@ -110,6 +110,11 @@ protected int expectedWarnings() {
         return 2;
     }
 
+    @Override
+    protected int expectedNotes() {
+        return 7;
+    }
+
     @Override
     public String getTargetVersion() {
         String javaVersion = getJavaVersion();

plexus-compilers/plexus-compiler-javac/src/test/java/org/codehaus/plexus/compiler/javac/ErrorMessageParserTest.java

@@ -116,6 +116,16 @@ public void testErrorMessage() {
         assertThat(compilerError.getEndLine(), is(7));
     }
 
+    @Test
+    public void testNoteMessage() throws IOException {
+        String error = "Note: My fancy annotation processor info" + EOL;
+        List<CompilerMessage> messages =
+                JavacCompiler.parseModernStream(0, new BufferedReader(new StringReader(error)));
+        assertThat(messages.size(), is(1));
+        assertThat(messages.get(0).isError(), is(false));
+        assertThat(messages.get(0).getMessage(), is("My fancy annotation processor info"));
+    }
+
     @Test
     public void testUnknownSymbolError() {
         String error = "./org/codehaus/foo/UnknownSymbol.java:7: cannot find symbol" + EOL + "symbol  : method foo()"

plexus-compilers/plexus-compiler-javac/src/test/java/org/codehaus/plexus/compiler/javac/JavaxToolsCompilerTest.java

@@ -25,12 +25,7 @@ public class JavaxToolsCompilerTest extends AbstractJavacCompilerTest {
     // no op default is to javax.tools if available
 
     @Override
-    protected int expectedWarnings() {
-        String javaVersion = getJavaVersion();
-        if (javaVersion.contains("21")) {
-            return 8;
-        } else {
-            return super.expectedWarnings();
-        }
+    protected int expectedNotes() {
+        return 7;
     }
 }