/*
 * Copyright 2000-2009 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.intellij.psi.impl.source.tree.java;

import com.intellij.lang.ASTNode;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.psi.impl.source.Constants;
import com.intellij.psi.impl.source.tree.ChildRole;
import com.intellij.psi.impl.source.tree.CompositeElement;
import com.intellij.psi.tree.ChildRoleBase;
import com.intellij.psi.tree.IElementType;
import org.jetbrains.annotations.NotNull;

public class AnnotationElement extends CompositeElement implements Constants {
  private static final Logger LOG = Logger.getInstance(AnnotationElement.class);

  public AnnotationElement() {
    super(ANNOTATION);
  }

  @Override
  public int getChildRole(@NotNull ASTNode child) {
    LOG.assertTrue(child.getTreeParent() == this);

    IElementType i = child.getElementType();
    if (i == ANNOTATION_PARAMETER_LIST) {
      return ChildRole.PARAMETER_LIST;
    }
    else if (i == JAVA_CODE_REFERENCE) {
      return ChildRole.CLASS_REFERENCE;
    }
    else {
      return ChildRoleBase.NONE;
    }
  }

  @Override
  public ASTNode findChildByRole(int role) {
    LOG.assertTrue(ChildRole.isUnique(role));
    switch (role) {
      case ChildRole.PARAMETER_LIST:
        return findChildByType(ANNOTATION_PARAMETER_LIST);

      case ChildRole.CLASS_REFERENCE:
        return findChildByType(JAVA_CODE_REFERENCE);

      default:
        return null;
    }
  }
}
