GrSuperReferenceResolver.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.statements.expressions;

import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiSubstitutor;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.psi.util.TypeConversionUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.psi.api.GroovyResolveResult;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.GrConstructorInvocation;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrReferenceExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.GrTypeDefinition;
import org.jetbrains.plugins.groovy.lang.psi.impl.GroovyResolveResultImpl;
import org.jetbrains.plugins.groovy.lang.psi.util.GrTraitUtil;
import org.jetbrains.plugins.groovy.lang.psi.util.PsiUtil;

public class GrSuperReferenceResolver {
  @Nullable("null if ref is not 'super' reference")
  public static GroovyResolveResult[] resolveSuperExpression(@NotNull GrReferenceExpression ref) {
    GrExpression qualifier = ref.getQualifier();

    if (qualifier == null) {
      final PsiElement parent = ref.getParent();
      if (parent instanceof GrConstructorInvocation) {
        return ((GrConstructorInvocation)parent).multiResolve(false);
      }
      PsiClass aClass = PsiUtil.getContextClass(ref);
      if (aClass != null) {
        return getSuperClass(aClass);
      }
    }
    else if (qualifier instanceof GrReferenceExpression) {
      GroovyResolveResult result = ((GrReferenceExpression)qualifier).advancedResolve();
      PsiElement resolved = result.getElement();
      if (resolved instanceof PsiClass) {
        PsiClass superClass = (PsiClass)resolved;

        GrTypeDefinition scopeClass = PsiTreeUtil.getParentOfType(ref, GrTypeDefinition.class, true);
        if (scopeClass != null && GrTraitUtil.isTrait(superClass) && scopeClass.isInheritor(superClass, false)) {
          PsiSubstitutor superClassSubstitutor = TypeConversionUtil.getSuperClassSubstitutor(superClass, scopeClass, PsiSubstitutor.EMPTY);
          return new GroovyResolveResultImpl[]{new GroovyResolveResultImpl(superClass, null, null, superClassSubstitutor, true, true)};
        }

        if (PsiUtil.hasEnclosingInstanceInScope(superClass, ref, false)) {
          return getSuperClass(superClass);
        }
      }
    }

    return null;
  }

  @NotNull
  private static GroovyResolveResult[] getSuperClass(@NotNull PsiClass aClass) {
    PsiClass superClass = aClass.getSuperClass();
    if (superClass != null) {
      PsiSubstitutor superClassSubstitutor = TypeConversionUtil.getSuperClassSubstitutor(superClass, aClass, PsiSubstitutor.EMPTY);
      return new GroovyResolveResultImpl[]{new GroovyResolveResultImpl(superClass, null, null, superClassSubstitutor, true, true)};
    }
    else {
      return GroovyResolveResult.EMPTY_ARRAY; //no super class, but the reference is definitely super-reference
    }
  }
}