/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.jetbrains.python.psi;

import com.intellij.lang.annotation.HighlightSeverity;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.impl.source.resolve.reference.impl.providers.FileReferenceSet;
import com.jetbrains.python.psi.types.TypeEvalContext;
import org.jetbrains.annotations.Nullable;

/**
 * @author yole
 */
public class WeakFileReference extends FileReferenceWithOneContext implements PsiReferenceEx {
  public WeakFileReference(FileReferenceSet fileReferenceSet, TextRange range, int index, String text) {
    super(fileReferenceSet, range, index, text);
  }

  @Nullable
  @Override
  public HighlightSeverity getUnresolvedHighlightSeverity(TypeEvalContext context) {
    return HighlightSeverity.WARNING;
  }

  @Nullable
  @Override
  public String getUnresolvedDescription() {
    return null;
  }
}

/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.jetbrains.python.psi;

import com.intellij.lang.annotation.HighlightSeverity;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.impl.source.resolve.reference.impl.providers.FileReferenceSet;
import com.jetbrains.python.psi.types.TypeEvalContext;
import org.jetbrains.annotations.Nls;
import org.jetbrains.annotations.Nullable;

/**
 * @author yole
 */
public class WeakFileReference extends FileReferenceWithOneContext implements PsiReferenceEx {
  public WeakFileReference(FileReferenceSet fileReferenceSet, TextRange range, int index, String text) {
    super(fileReferenceSet, range, index, text);
  }

  @Nullable
  @Override
  public HighlightSeverity getUnresolvedHighlightSeverity(TypeEvalContext context) {
    return HighlightSeverity.WARNING;
  }

  @Nullable
  @Override
  public @Nls String getUnresolvedDescription() {
    return null;
  }
}

Annotate WeakFileReference#getUnresolvedDescription() similarly to PsiReferenceEx