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src/share/jaxws_classes/com/sun/xml/internal/xsom/util/DeferedCollection.java@e530533619ec (annotated)

src/share/jaxws_classes/com/sun/xml/internal/xsom/util/DeferedCollection.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, 2010, 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.xsom.util;
aoqi@0	27
aoqi@0	28	import java.util.ArrayList;
aoqi@0	29	import java.util.Collection;
aoqi@0	30	import java.util.Iterator;
aoqi@0	31	import java.util.List;
aoqi@0	32	import java.util.NoSuchElementException;
aoqi@0	33
aoqi@0	34	/**
aoqi@0	35	* {@link Collection} that returns the view of objects which are actually fetched
aoqi@0	36	* lazily from an {@link Iterator}.
aoqi@0	37	*
aoqi@0	38	* @author Kohsuke Kawaguchi
aoqi@0	39	*/
aoqi@0	40	public class DeferedCollection<T> implements Collection<T> {
aoqi@0	41	/**
aoqi@0	42	* The iterator that lazily evaluates SCD query.
aoqi@0	43	*/
aoqi@0	44	private final Iterator<T> result;
aoqi@0	45
aoqi@0	46	/**
aoqi@0	47	* Stores values that are already fetched from {@link #result}.
aoqi@0	48	*/
aoqi@0	49	private final List<T> archive = new ArrayList<T>();
aoqi@0	50
aoqi@0	51	public DeferedCollection(Iterator<T> result) {
aoqi@0	52	this.result = result;
aoqi@0	53	}
aoqi@0	54
aoqi@0	55	public boolean isEmpty() {
aoqi@0	56	if(archive.isEmpty())
aoqi@0	57	fetch();
aoqi@0	58	return archive.isEmpty();
aoqi@0	59	}
aoqi@0	60
aoqi@0	61	public int size() {
aoqi@0	62	fetchAll();
aoqi@0	63	return archive.size();
aoqi@0	64	}
aoqi@0	65
aoqi@0	66	public boolean contains(Object o) {
aoqi@0	67	if(archive.contains(o))
aoqi@0	68	return true;
aoqi@0	69	while(result.hasNext()) {
aoqi@0	70	T value = result.next();
aoqi@0	71	archive.add(value);
aoqi@0	72	if(value.equals(o))
aoqi@0	73	return true;
aoqi@0	74	}
aoqi@0	75	return false;
aoqi@0	76	}
aoqi@0	77
aoqi@0	78	public boolean containsAll(Collection<?> c) {
aoqi@0	79	for (Object o : c) {
aoqi@0	80	if(!contains(o))
aoqi@0	81	return false;
aoqi@0	82	}
aoqi@0	83	return true;
aoqi@0	84	}
aoqi@0	85
aoqi@0	86	public Iterator<T> iterator() {
aoqi@0	87	return new Iterator<T>() {
aoqi@0	88	int idx=0;
aoqi@0	89	public boolean hasNext() {
aoqi@0	90	if(idx<archive.size())
aoqi@0	91	return true;
aoqi@0	92	return result.hasNext();
aoqi@0	93	}
aoqi@0	94
aoqi@0	95	public T next() {
aoqi@0	96	if(idx==archive.size())
aoqi@0	97	fetch();
aoqi@0	98	if(idx==archive.size())
aoqi@0	99	throw new NoSuchElementException();
aoqi@0	100	return archive.get(idx++);
aoqi@0	101	}
aoqi@0	102
aoqi@0	103	public void remove() {
aoqi@0	104	// TODO
aoqi@0	105	}
aoqi@0	106	};
aoqi@0	107	}
aoqi@0	108
aoqi@0	109	public Object[] toArray() {
aoqi@0	110	fetchAll();
aoqi@0	111	return archive.toArray();
aoqi@0	112	}
aoqi@0	113
aoqi@0	114	public <T>T[] toArray(T[] a) {
aoqi@0	115	fetchAll();
aoqi@0	116	return archive.toArray(a);
aoqi@0	117	}
aoqi@0	118
aoqi@0	119
aoqi@0	120
aoqi@0	121	private void fetchAll() {
aoqi@0	122	while(result.hasNext())
aoqi@0	123	archive.add(result.next());
aoqi@0	124	}
aoqi@0	125
aoqi@0	126	/**
aoqi@0	127	* Fetches another item from {@link
aoqi@0	128	*/
aoqi@0	129	private void fetch() {
aoqi@0	130	if(result.hasNext())
aoqi@0	131	archive.add(result.next());
aoqi@0	132	}
aoqi@0	133
aoqi@0	134	// mutation methods are unsupported
aoqi@0	135	public boolean add(T o) {
aoqi@0	136	throw new UnsupportedOperationException();
aoqi@0	137	}
aoqi@0	138
aoqi@0	139	public boolean remove(Object o) {
aoqi@0	140	throw new UnsupportedOperationException();
aoqi@0	141	}
aoqi@0	142
aoqi@0	143	public boolean addAll(Collection<? extends T> c) {
aoqi@0	144	throw new UnsupportedOperationException();
aoqi@0	145	}
aoqi@0	146
aoqi@0	147	public boolean removeAll(Collection<?> c) {
aoqi@0	148	throw new UnsupportedOperationException();
aoqi@0	149	}
aoqi@0	150
aoqi@0	151	public boolean retainAll(Collection<?> c) {
aoqi@0	152	throw new UnsupportedOperationException();
aoqi@0	153	}
aoqi@0	154
aoqi@0	155	public void clear() {
aoqi@0	156	throw new UnsupportedOperationException();
aoqi@0	157	}
aoqi@0	158	}