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annotate truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/util/Filterator.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 9c8c0937da41
children
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1 /*
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2 * Copyright (c) 2012, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.dsl.processor.util;
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24
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25 import java.util.Iterator;
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26 import java.util.NoSuchElementException;
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27
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28 public class Filterator<T> implements Iterator<T> {
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29
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30 private final Predicate<T> includePredicate;
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31 private final Iterator<T> elements;
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32
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33 private boolean hasCached;
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34 private T cached;
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35
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36 public Filterator(Iterator<T> elements, Predicate<T> includePredicate) {
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37 this.elements = elements;
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38 this.includePredicate = includePredicate;
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39 }
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40
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41 public boolean hasNext() {
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42 if (hasCached) {
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43 return true;
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44 }
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45 nextValue();
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46 return hasCached;
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47 }
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48
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49 private void nextValue() {
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50 while (!hasCached && elements.hasNext()) {
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51 T element = elements.next();
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52 if (includePredicate.evaluate(element)) {
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53 cached = element;
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54 hasCached = true;
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55 }
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56 }
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57 }
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58
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59 public T next() {
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60 T foundCached = getCached();
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61 if (foundCached != null) {
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62 return foundCached;
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63 } else {
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64 nextValue();
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65 if (!hasCached) {
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66 throw new NoSuchElementException();
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67 }
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68 return getCached();
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69 }
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70 }
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71
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72 private T getCached() {
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73 if (hasCached) {
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74 hasCached = false;
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75 T value = cached;
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76 cached = null;
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77 return value;
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78 }
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79 return null;
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80 }
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81
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82 @Override
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83 public void remove() {
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84 elements.remove();
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85 }
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86
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87 }