Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: src/share/classes/com/sun/tools/javac/model/FilteredMemberList.java
src/share/classes/com/sun/tools/javac/model/FilteredMemberList.java
- changeset 0
- 959103a6100f
- child 2525
- 2eb010b6cb22
equal
deleted
inserted
replaced
| -1:000000000000 | 0:959103a6100f |
|---|---|
| 1 /* | |
| 2 * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. Oracle designates this | |
| 8 * particular file as subject to the "Classpath" exception as provided | |
| 9 * by Oracle in the LICENSE file that accompanied this code. | |
| 10 * | |
| 11 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 * accompanied this code). | |
| 16 * | |
| 17 * You should have received a copy of the GNU General Public License version | |
| 18 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 * | |
| 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 * or visit www.oracle.com if you need additional information or have any | |
| 23 * questions. | |
| 24 */ | |
| 25 | |
| 26 package com.sun.tools.javac.model; | |
| 27 | |
| 28 import java.util.AbstractList; | |
| 29 import java.util.Iterator; | |
| 30 import java.util.NoSuchElementException; | |
| 31 import com.sun.tools.javac.code.Scope; | |
| 32 import com.sun.tools.javac.code.Symbol; | |
| 33 | |
| 34 import static com.sun.tools.javac.code.Flags.*; | |
| 35 | |
| 36 /** | |
| 37 * Utility to construct a view of a symbol's members, | |
| 38 * filtering out unwanted elements such as synthetic ones. | |
| 39 * This view is most efficiently accessed through its iterator() method. | |
| 40 * | |
| 41 * <p><b>This is NOT part of any supported API. | |
| 42 * If you write code that depends on this, you do so at your own risk. | |
| 43 * This code and its internal interfaces are subject to change or | |
| 44 * deletion without notice.</b> | |
| 45 */ | |
| 46 public class FilteredMemberList extends AbstractList<Symbol> { | |
| 47 | |
| 48 private final Scope scope; | |
| 49 | |
| 50 public FilteredMemberList(Scope scope) { | |
| 51 this.scope = scope; | |
| 52 } | |
| 53 | |
| 54 public int size() { | |
| 55 int cnt = 0; | |
| 56 for (Scope.Entry e = scope.elems; e != null; e = e.sibling) { | |
| 57 if (!unwanted(e.sym)) | |
| 58 cnt++; | |
| 59 } | |
| 60 return cnt; | |
| 61 } | |
| 62 | |
| 63 public Symbol get(int index) { | |
| 64 for (Scope.Entry e = scope.elems; e != null; e = e.sibling) { | |
| 65 if (!unwanted(e.sym) && (index-- == 0)) | |
| 66 return e.sym; | |
| 67 } | |
| 68 throw new IndexOutOfBoundsException(); | |
| 69 } | |
| 70 | |
| 71 // A more efficient implementation than AbstractList's. | |
| 72 public Iterator<Symbol> iterator() { | |
| 73 return new Iterator<Symbol>() { | |
| 74 | |
| 75 /** The next entry to examine, or null if none. */ | |
| 76 private Scope.Entry nextEntry = scope.elems; | |
| 77 | |
| 78 private boolean hasNextForSure = false; | |
| 79 | |
| 80 public boolean hasNext() { | |
| 81 if (hasNextForSure) { | |
| 82 return true; | |
| 83 } | |
| 84 while (nextEntry != null && unwanted(nextEntry.sym)) { | |
| 85 nextEntry = nextEntry.sibling; | |
| 86 } | |
| 87 hasNextForSure = (nextEntry != null); | |
| 88 return hasNextForSure; | |
| 89 } | |
| 90 | |
| 91 public Symbol next() { | |
| 92 if (hasNext()) { | |
| 93 Symbol result = nextEntry.sym; | |
| 94 nextEntry = nextEntry.sibling; | |
| 95 hasNextForSure = false; | |
| 96 return result; | |
| 97 } else { | |
| 98 throw new NoSuchElementException(); | |
| 99 } | |
| 100 } | |
| 101 | |
| 102 public void remove() { | |
| 103 throw new UnsupportedOperationException(); | |
| 104 } | |
| 105 }; | |
| 106 } | |
| 107 | |
| 108 /** | |
| 109 * Tests whether this is a symbol that should never be seen by | |
| 110 * clients, such as a synthetic class. Returns true for null. | |
| 111 */ | |
| 112 private static boolean unwanted(Symbol s) { | |
| 113 return s == null || (s.flags() & SYNTHETIC) != 0; | |
| 114 } | |
| 115 } |
