/*
 * Copyright 2000-2013 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.impl;

import com.intellij.lang.ASTNode;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiPolyVariantReference;
import com.jetbrains.python.PyElementTypes;
import com.jetbrains.python.psi.PyAnnotation;
import com.jetbrains.python.psi.PyClass;
import com.jetbrains.python.psi.PyExpression;
import com.jetbrains.python.psi.PyReferenceExpression;
import com.jetbrains.python.psi.stubs.PyAnnotationStub;

/**
 * @author yole
 */
public class PyAnnotationImpl extends PyBaseElementImpl<PyAnnotationStub> implements PyAnnotation {
  public PyAnnotationImpl(ASTNode astNode) {
    super(astNode);
  }

  public PyAnnotationImpl(PyAnnotationStub stub) {
    super(stub, PyElementTypes.ANNOTATION);
  }

  @Override
  public PyExpression getValue() {
    return findChildByClass(PyExpression.class);
  }

  @Override
  public PyClass resolveToClass() {
    PyExpression expr = getValue();
    if (expr instanceof PyReferenceExpression) {
      final PsiPolyVariantReference reference = ((PyReferenceExpression)expr).getReference();
      final PsiElement result = reference.resolve();
      if (result instanceof PyClass) {
        return (PyClass) result;
      }
    }
    return null;
  }
}