jdk8-mips64-public/jaxws: src/share/jaxws_classes/com/sun/xml/internal/bind/v2/util/FlattenIterator.java@e530533619ec

     1 /*

     2  * Copyright (c) 1997, 2011, 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  */

    26 package com.sun.xml.internal.bind.v2.util;

    28 import java.util.Iterator;

    29 import java.util.Map;

    30 import java.util.NoSuchElementException;

    32 /**

    33  * {@link Iterator} that walks over a map of maps.

    34  *

    35  * @author Kohsuke Kawaguchi

    36  * @since 2.0

    37  */

    38 public final class FlattenIterator<T> implements Iterator<T> {

    40     private final Iterator<? extends Map<?,? extends T>> parent;

    41     private Iterator<? extends T> child = null;

    42     private T next;

    44     public FlattenIterator( Iterable<? extends Map<?,? extends T>> core ) {

    45         this.parent = core.iterator();

    46     }

    49     public void remove() {

    50         throw new UnsupportedOperationException();

    51     }

    53     public boolean hasNext() {

    54         getNext();

    55         return next!=null;

    56     }

    58     public T next() {

    59         T r = next;

    60         next = null;

    61         if(r==null)

    62             throw new NoSuchElementException();

    63         return r;

    64     }

    66     private void getNext() {

    67         if(next!=null)  return;

    69         if(child!=null && child.hasNext()) {

    70             next = child.next();

    71             return;

    72         }

    73         // child is empty

    74         if(parent.hasNext()) {

    75             child = parent.next().values().iterator();

    76             getNext();

    77         }

    78         // else

    79         //      no more object

    80     }

    81 }

Mercurial > jdk8-mips64-public > jaxws / file revision