plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/psi/impl/GrAnnotationUtil.java

/*
 * 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 org.jetbrains.plugins.groovy.lang.psi.impl;

import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.psi.api.auxiliary.modifiers.annotation.GrAnnotation;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrReferenceExpression;

/**
 * @author Max Medvedev
 */
public class GrAnnotationUtil {
  @Nullable
  public static String inferStringAttribute(@NotNull PsiAnnotation annotation, @NotNull String attributeName) {
    final PsiAnnotationMemberValue targetValue = annotation.findAttributeValue(attributeName);
    if (targetValue instanceof PsiLiteral) {
      final Object value = ((PsiLiteral)targetValue).getValue();
      if (value instanceof String) return (String)value;
    }
    return null;
  }

  @Nullable
  public static Integer inferIntegerAttribute(@NotNull PsiAnnotation annotation, @NotNull String attributeName) {
    final PsiAnnotationMemberValue targetValue = annotation.findAttributeValue(attributeName);
    if (targetValue instanceof PsiLiteral) {
      final Object value = ((PsiLiteral)targetValue).getValue();
      if (value instanceof Integer) return (Integer)value;
    }
    return null;
  }

  @Nullable
  public static Boolean inferBooleanAttribute(@NotNull PsiAnnotation annotation, @NotNull String attributeName) {
    final PsiAnnotationMemberValue targetValue = annotation.findAttributeValue(attributeName);
    if (targetValue instanceof PsiLiteral) {
      final Object value = ((PsiLiteral)targetValue).getValue();
      if (value instanceof Boolean) return (Boolean)value;
    }
    return null;
  }

  @Nullable
  public static PsiClass inferClassAttribute(@NotNull PsiAnnotation annotation, @NotNull String attributeName) {
    final PsiAnnotationMemberValue targetValue = annotation.findAttributeValue(attributeName);
    if (targetValue instanceof PsiClassObjectAccessExpression) {
      PsiType type = ((PsiClassObjectAccessExpression)targetValue).getOperand().getType();
      if (type instanceof PsiClassType) {
        return ((PsiClassType)type).resolve();
      }
    }
    else if (targetValue instanceof GrReferenceExpression) {
      if ("class".equals(((GrReferenceExpression)targetValue).getReferenceName())) {
        GrExpression qualifier = ((GrReferenceExpression)targetValue).getQualifier();
        if (qualifier instanceof GrReferenceExpression) {
          PsiElement resolved = ((GrReferenceExpression)qualifier).resolve();
          if (resolved instanceof PsiClass) {
            return (PsiClass)resolved;
          }
        }
      }
      PsiElement resolved = ((GrReferenceExpression)targetValue).resolve();
      if (resolved instanceof PsiClass) return (PsiClass)resolved;
    }
    return null;
  }

  @Nullable
  public static PsiType extractClassTypeFromClassAttributeValue(PsiAnnotationMemberValue targetValue) {
    if (targetValue instanceof PsiClassObjectAccessExpression) {
      return ((PsiClassObjectAccessExpression)targetValue).getOperand().getType();
    }
    else if (targetValue instanceof GrReferenceExpression) {
      if ("class".equals(((GrReferenceExpression)targetValue).getReferenceName())) {
        GrExpression qualifier = ((GrReferenceExpression)targetValue).getQualifier();
        if (qualifier instanceof GrReferenceExpression) {
          PsiElement resolved = ((GrReferenceExpression)qualifier).resolve();
          if (resolved instanceof PsiClass) {
            return qualifier.getType();
          }
        }
      }
      PsiElement resolved = ((GrReferenceExpression)targetValue).resolve();
      if (resolved instanceof PsiClass) {
        return ((GrReferenceExpression)targetValue).getType();
      }
    }
    return null;
  }

  public static PsiElement getActualOwner(GrAnnotation annotation) {
    PsiAnnotationOwner owner = annotation.getOwner();
    if (owner instanceof PsiModifierList) return ((PsiModifierList)owner).getParent();

    return (PsiElement)owner;
  }
}