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// Copyright 2014 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.buildjar.javac;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.JCDiagnostic;
import com.sun.tools.javac.util.Log;
/**
* Log class for our custom patched javac.
*
* <p> This log class tweaks the standard javac log class so
* that it drops all non-errors after the first error that
* gets reported. By doing this, we
* ensure that all warnings are listed before all errors in javac's
* output. This makes life easier for everybody.
*/
public class BlazeJavacLog extends Log {
private boolean hadError = false;
/**
* Registers a custom BlazeJavacLog for the given context and -Werror spec.
*
* @param context Context
* @param warningsAsErrors Werror value
*/
public static void preRegister(final Context context) {
context.put(logKey, new Context.Factory<Log>() {
@Override
public Log make(Context c) {
return new BlazeJavacLog(c);
}
});
}
public static BlazeJavacLog instance(Context context) {
return (BlazeJavacLog) context.get(logKey);
}
BlazeJavacLog(Context context) {
super(context);
}
/**
* Returns true if we should display the note diagnostic
* passed in as argument, and false if we should discard
* it.
*/
private boolean shouldDisplayNote(JCDiagnostic diag) {
String noteCode = diag.getCode();
return noteCode == null ||
(!noteCode.startsWith("compiler.note.deprecated") &&
!noteCode.startsWith("compiler.note.unchecked"));
}
@Override
protected void writeDiagnostic(JCDiagnostic diag) {
switch (diag.getKind()) {
case NOTE:
if (shouldDisplayNote(diag)) {
super.writeDiagnostic(diag);
}
break;
case ERROR:
hadError = true;
super.writeDiagnostic(diag);
break;
default:
if (!hadError) {
// Do not print further warnings if an error has occured.
super.writeDiagnostic(diag);
}
}
}
}
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