jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/model/FilteredMemberList.java@24a47c3062fe

6754988: Update copyright year
Summary: Update for files that have been modified starting July 2008
Reviewed-by: ohair, tbell

     1 /*

     2  * Copyright 2005-2008 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    26 package com.sun.tools.javac.model;

    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;

    34 import static com.sun.tools.javac.code.Flags.*;

    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 API supported by Sun Microsystems.  If

    42  * 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> {

    48     private final Scope scope;

    50     public FilteredMemberList(Scope scope) {

    51         this.scope = scope;

    52     }

    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     }

    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     }

    71     // A more efficient implementation than AbstractList's.

    72     public Iterator<Symbol> iterator() {

    73         return new Iterator<Symbol>() {

    75             /** The next entry to examine, or null if none. */

    76             private Scope.Entry nextEntry = scope.elems;

    78             private boolean hasNextForSure = false;

    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             }

    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             }

   102             public void remove() {

   103                 throw new UnsupportedOperationException();

   104             }

   105         };

   106     }

   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 }

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