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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.lib.skyframe;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
abstract class AbstractFileSymlinkExceptionUniquenessFunction implements SkyFunction {
protected abstract String getConciseDescription();
protected abstract String getHeaderMessage();
protected abstract String getFooterMessage();
protected abstract SkyValue getDummyValue();
@Override
public SkyValue compute(SkyKey skyKey, Environment env) {
StringBuilder errorMessage = new StringBuilder();
errorMessage.append(getConciseDescription() + " detected\n");
errorMessage.append(getHeaderMessage() + "\n");
@SuppressWarnings("unchecked")
ImmutableList<RootedPath> chain = (ImmutableList<RootedPath>) skyKey.argument();
for (RootedPath rootedPath : chain) {
errorMessage.append(rootedPath.asPath() + "\n");
}
errorMessage.append(getFooterMessage() + "\n");
// The purpose of this SkyFunction is the side effect of emitting an error message exactly
// once per build per unique symlink error.
env.getListener().handle(Event.error(errorMessage.toString()));
return getDummyValue();
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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