content: /*
   * Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package openjdk.tools.javac.model;
  
  import java.util.AbstractList;
  import java.util.Iterator;
  import openjdk.tools.javac.code.Scope;
  import openjdk.tools.javac.code.Symbol;
  
  import static openjdk.tools.javac.code.Flags.*;
  import static openjdk.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
  
  /**
   * Utility to construct a view of a symbol's members,
   * filtering out unwanted elements such as synthetic ones.
   * This view is most efficiently accessed through its iterator() method.
   *
   * <p><b>This is NOT part of any supported API.
   * If you write code that depends on this, you do so at your own risk.
   * This code and its internal interfaces are subject to change or
   * deletion without notice.</b>
   */
  public class FilteredMemberList extends AbstractList<Symbol> {
  
      private final Scope scope;
  
      public FilteredMemberList(Scope scope) {
          this.scope = scope;
      }
  
      public int size() {
          int cnt = 0;
          for (Symbol sym : scope.getSymbols(NON_RECURSIVE)) {
              if (!unwanted(sym))
                  cnt++;
          }
          return cnt;
      }
  
      public Symbol get(int index) {
          for (Symbol sym : scope.getSymbols(NON_RECURSIVE)) {
              if (!unwanted(sym) && (index-- == 0))
                  return sym;
          }
          throw new IndexOutOfBoundsException();
      }
  
      // A more efficient implementation than AbstractList's.
      public Iterator<Symbol> iterator() {
          return scope.getSymbols(t -> !unwanted(t), NON_RECURSIVE).iterator();
      }
  
      /**
       * Tests whether this is a symbol that should never be seen by
       * clients, such as a synthetic class.  Returns true for null.
       */
      private static boolean unwanted(Symbol s) {
          return s == null  ||  (s.flags() & SYNTHETIC) != 0;
      }
  }
  