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src/share/jaxws_classes/com/sun/xml/internal/bind/v2/util/FlattenIterator.java@e530533619ec (annotated)

src/share/jaxws_classes/com/sun/xml/internal/bind/v2/util/FlattenIterator.java

Thu, 12 Oct 2017 19:44:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 19:44:07 +0800

changeset 760

e530533619ec

parent 0

373ffda63c9a

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.xml.internal.bind.v2.util;
aoqi@0	27
aoqi@0	28	import java.util.Iterator;
aoqi@0	29	import java.util.Map;
aoqi@0	30	import java.util.NoSuchElementException;
aoqi@0	31
aoqi@0	32	/**
aoqi@0	33	* {@link Iterator} that walks over a map of maps.
aoqi@0	34	*
aoqi@0	35	* @author Kohsuke Kawaguchi
aoqi@0	36	* @since 2.0
aoqi@0	37	*/
aoqi@0	38	public final class FlattenIterator<T> implements Iterator<T> {
aoqi@0	39
aoqi@0	40	private final Iterator<? extends Map<?,? extends T>> parent;
aoqi@0	41	private Iterator<? extends T> child = null;
aoqi@0	42	private T next;
aoqi@0	43
aoqi@0	44	public FlattenIterator( Iterable<? extends Map<?,? extends T>> core ) {
aoqi@0	45	this.parent = core.iterator();
aoqi@0	46	}
aoqi@0	47
aoqi@0	48
aoqi@0	49	public void remove() {
aoqi@0	50	throw new UnsupportedOperationException();
aoqi@0	51	}
aoqi@0	52
aoqi@0	53	public boolean hasNext() {
aoqi@0	54	getNext();
aoqi@0	55	return next!=null;
aoqi@0	56	}
aoqi@0	57
aoqi@0	58	public T next() {
aoqi@0	59	T r = next;
aoqi@0	60	next = null;
aoqi@0	61	if(r==null)
aoqi@0	62	throw new NoSuchElementException();
aoqi@0	63	return r;
aoqi@0	64	}
aoqi@0	65
aoqi@0	66	private void getNext() {
aoqi@0	67	if(next!=null) return;
aoqi@0	68
aoqi@0	69	if(child!=null && child.hasNext()) {
aoqi@0	70	next = child.next();
aoqi@0	71	return;
aoqi@0	72	}
aoqi@0	73	// child is empty
aoqi@0	74	if(parent.hasNext()) {
aoqi@0	75	child = parent.next().values().iterator();
aoqi@0	76	getNext();
aoqi@0	77	}
aoqi@0	78	// else
aoqi@0	79	// no more object
aoqi@0	80	}
aoqi@0	81	}