1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/com/sun/tools/javac/model/FilteredMemberList.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,115 @@
1.4 +/*
1.5 + * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package com.sun.tools.javac.model;
1.30 +
1.31 +import java.util.AbstractList;
1.32 +import java.util.Iterator;
1.33 +import java.util.NoSuchElementException;
1.34 +import com.sun.tools.javac.code.Scope;
1.35 +import com.sun.tools.javac.code.Symbol;
1.36 +
1.37 +import static com.sun.tools.javac.code.Flags.*;
1.38 +
1.39 +/**
1.40 + * Utility to construct a view of a symbol's members,
1.41 + * filtering out unwanted elements such as synthetic ones.
1.42 + * This view is most efficiently accessed through its iterator() method.
1.43 + *
1.44 + * <p><b>This is NOT part of any supported API.
1.45 + * If you write code that depends on this, you do so at your own risk.
1.46 + * This code and its internal interfaces are subject to change or
1.47 + * deletion without notice.</b>
1.48 + */
1.49 +public class FilteredMemberList extends AbstractList<Symbol> {
1.50 +
1.51 + private final Scope scope;
1.52 +
1.53 + public FilteredMemberList(Scope scope) {
1.54 + this.scope = scope;
1.55 + }
1.56 +
1.57 + public int size() {
1.58 + int cnt = 0;
1.59 + for (Scope.Entry e = scope.elems; e != null; e = e.sibling) {
1.60 + if (!unwanted(e.sym))
1.61 + cnt++;
1.62 + }
1.63 + return cnt;
1.64 + }
1.65 +
1.66 + public Symbol get(int index) {
1.67 + for (Scope.Entry e = scope.elems; e != null; e = e.sibling) {
1.68 + if (!unwanted(e.sym) && (index-- == 0))
1.69 + return e.sym;
1.70 + }
1.71 + throw new IndexOutOfBoundsException();
1.72 + }
1.73 +
1.74 + // A more efficient implementation than AbstractList's.
1.75 + public Iterator<Symbol> iterator() {
1.76 + return new Iterator<Symbol>() {
1.77 +
1.78 + /** The next entry to examine, or null if none. */
1.79 + private Scope.Entry nextEntry = scope.elems;
1.80 +
1.81 + private boolean hasNextForSure = false;
1.82 +
1.83 + public boolean hasNext() {
1.84 + if (hasNextForSure) {
1.85 + return true;
1.86 + }
1.87 + while (nextEntry != null && unwanted(nextEntry.sym)) {
1.88 + nextEntry = nextEntry.sibling;
1.89 + }
1.90 + hasNextForSure = (nextEntry != null);
1.91 + return hasNextForSure;
1.92 + }
1.93 +
1.94 + public Symbol next() {
1.95 + if (hasNext()) {
1.96 + Symbol result = nextEntry.sym;
1.97 + nextEntry = nextEntry.sibling;
1.98 + hasNextForSure = false;
1.99 + return result;
1.100 + } else {
1.101 + throw new NoSuchElementException();
1.102 + }
1.103 + }
1.104 +
1.105 + public void remove() {
1.106 + throw new UnsupportedOperationException();
1.107 + }
1.108 + };
1.109 + }
1.110 +
1.111 + /**
1.112 + * Tests whether this is a symbol that should never be seen by
1.113 + * clients, such as a synthetic class. Returns true for null.
1.114 + */
1.115 + private static boolean unwanted(Symbol s) {
1.116 + return s == null || (s.flags() & SYNTHETIC) != 0;
1.117 + }
1.118 +}
