ModifierPredicate.java

/*
 * Copyright 2000-2017 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.siyeh.ipp.modifiers;

import com.intellij.psi.*;
import com.intellij.psi.javadoc.PsiDocComment;
import com.siyeh.ipp.base.PsiElementPredicate;
import org.jetbrains.annotations.NotNull;

/**
 * @author Bas Leijdekkers
 */
class ModifierPredicate implements PsiElementPredicate {

  @PsiModifier.ModifierConstant
  private final String myModifier;

  public ModifierPredicate(@NotNull @PsiModifier.ModifierConstant String modifier) {
    myModifier = modifier;
  }

  @Override
  public boolean satisfiedBy(PsiElement element) {
    final PsiElement parent = element.getParent();
    if (!(parent instanceof PsiClass || parent instanceof PsiField || parent instanceof PsiMethod) || parent instanceof PsiEnumConstant) {
      return false;
    }
    if (element instanceof PsiDocComment || element instanceof PsiCodeBlock) {
      return false;
    }
    final PsiNameIdentifierOwner named = (PsiNameIdentifierOwner)parent;
    final PsiElement identifier = named.getNameIdentifier();
    if (identifier == null || identifier.getTextRange().getEndOffset() <= element.getTextRange().getStartOffset()) {
      return false;
    }
    if (parent instanceof PsiClass) {
      final PsiClass aClass = (PsiClass)parent;
      if (aClass.getParent() instanceof PsiDeclarationStatement) {
        // local classes are not allowed a modifier
        return false;
      }
      if (aClass.getContainingClass() == null &&
          (myModifier.equals(PsiModifier.PRIVATE) || myModifier.equals(PsiModifier.PROTECTED))) {
        return false;
      }
    }
    else if (parent instanceof PsiMethod) {
      final PsiMethod method = (PsiMethod)parent;
      final PsiClass containingClass = method.getContainingClass();
      if (containingClass == null || containingClass.isInterface() || (method.isConstructor() && containingClass.isEnum())) {
        return false;
      }
    }
    final PsiModifierListOwner owner = (PsiModifierListOwner)parent;
    final PsiModifierList modifierList = owner.getModifierList();
    return modifierList != null && !modifierList.hasModifierProperty(myModifier);
  }
}