| /* |
| * Copyright 2005-2008 Sun Microsystems, Inc. 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package com.sun.tools.javac.model; |
| |
| import java.util.AbstractList; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import com.sun.tools.javac.code.Scope; |
| import com.sun.tools.javac.code.Symbol; |
| |
| import static com.sun.tools.javac.code.Flags.*; |
| |
| /** |
| * 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 API supported by Sun Microsystems. 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 (Scope.Entry e = scope.elems; e != null; e = e.sibling) { |
| if (!unwanted(e.sym)) |
| cnt++; |
| } |
| return cnt; |
| } |
| |
| public Symbol get(int index) { |
| for (Scope.Entry e = scope.elems; e != null; e = e.sibling) { |
| if (!unwanted(e.sym) && (index-- == 0)) |
| return e.sym; |
| } |
| throw new IndexOutOfBoundsException(); |
| } |
| |
| // A more efficient implementation than AbstractList's. |
| public Iterator<Symbol> iterator() { |
| return new Iterator<Symbol>() { |
| |
| /** The next entry to examine, or null if none. */ |
| private Scope.Entry nextEntry = scope.elems; |
| |
| private boolean hasNextForSure = false; |
| |
| public boolean hasNext() { |
| if (hasNextForSure) { |
| return true; |
| } |
| while (nextEntry != null && unwanted(nextEntry.sym)) { |
| nextEntry = nextEntry.sibling; |
| } |
| hasNextForSure = (nextEntry != null); |
| return hasNextForSure; |
| } |
| |
| public Symbol next() { |
| if (hasNext()) { |
| Symbol result = nextEntry.sym; |
| nextEntry = nextEntry.sibling; |
| hasNextForSure = false; |
| return result; |
| } else { |
| throw new NoSuchElementException(); |
| } |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| |
| /** |
| * 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; |
| } |
| } |