author | jjg |
Thu, 10 Jun 2010 16:08:01 -0700 | |
changeset 5847 | 1908176fd6e3 |
parent 5520 | 86e4b9a9da40 |
child 25443 | 9187d77f2c64 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.tools.javac.model; |
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import java.util.AbstractList; |
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import java.util.Iterator; |
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import java.util.NoSuchElementException; |
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import com.sun.tools.javac.code.Scope; |
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import com.sun.tools.javac.code.Symbol; |
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import static com.sun.tools.javac.code.Flags.*; |
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/** |
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* Utility to construct a view of a symbol's members, |
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* filtering out unwanted elements such as synthetic ones. |
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* This view is most efficiently accessed through its iterator() method. |
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* |
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5847
1908176fd6e3
6944312: Potential rebranding issues in openjdk/langtools repository sources
jjg
parents:
5520
diff
changeset
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* <p><b>This is NOT part of any supported API. |
1908176fd6e3
6944312: Potential rebranding issues in openjdk/langtools repository sources
jjg
parents:
5520
diff
changeset
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* If you write code that depends on this, you do so at your own risk. |
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* This code and its internal interfaces are subject to change or |
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* deletion without notice.</b> |
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*/ |
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public class FilteredMemberList extends AbstractList<Symbol> { |
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private final Scope scope; |
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public FilteredMemberList(Scope scope) { |
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this.scope = scope; |
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} |
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public int size() { |
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int cnt = 0; |
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for (Scope.Entry e = scope.elems; e != null; e = e.sibling) { |
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if (!unwanted(e.sym)) |
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cnt++; |
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} |
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return cnt; |
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} |
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public Symbol get(int index) { |
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for (Scope.Entry e = scope.elems; e != null; e = e.sibling) { |
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if (!unwanted(e.sym) && (index-- == 0)) |
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return e.sym; |
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} |
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throw new IndexOutOfBoundsException(); |
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} |
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// A more efficient implementation than AbstractList's. |
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public Iterator<Symbol> iterator() { |
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return new Iterator<Symbol>() { |
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/** The next entry to examine, or null if none. */ |
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private Scope.Entry nextEntry = scope.elems; |
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private boolean hasNextForSure = false; |
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public boolean hasNext() { |
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if (hasNextForSure) { |
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return true; |
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} |
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while (nextEntry != null && unwanted(nextEntry.sym)) { |
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nextEntry = nextEntry.sibling; |
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} |
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hasNextForSure = (nextEntry != null); |
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return hasNextForSure; |
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} |
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public Symbol next() { |
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if (hasNext()) { |
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Symbol result = nextEntry.sym; |
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nextEntry = nextEntry.sibling; |
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hasNextForSure = false; |
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return result; |
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} else { |
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throw new NoSuchElementException(); |
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} |
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} |
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public void remove() { |
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throw new UnsupportedOperationException(); |
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} |
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}; |
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} |
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/** |
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* Tests whether this is a symbol that should never be seen by |
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* clients, such as a synthetic class. Returns true for null. |
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*/ |
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private static boolean unwanted(Symbol s) { |
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return s == null || (s.flags() & SYNTHETIC) != 0; |
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} |
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} |