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annotate truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/util/Filterator.java @ 21951:9c8c0937da41

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Moving all sources into truffle subdirectory
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 17 Jun 2015 10:58:08 +0200
parents graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/util/Filterator.java@93068303f856
children dc83cc1f94f2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.*;
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26
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27 public class Filterator<T> implements Iterator<T> {
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28
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29 private final Predicate<T> includePredicate;
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30 private final Iterator<T> elements;
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31
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32 private boolean hasCached;
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33 private T cached;
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34
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35 public Filterator(Iterator<T> elements, Predicate<T> includePredicate) {
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36 this.elements = elements;
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37 this.includePredicate = includePredicate;
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38 }
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39
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40 public boolean hasNext() {
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41 if (hasCached) {
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42 return true;
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43 }
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44 nextValue();
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45 return hasCached;
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46 }
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47
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48 private void nextValue() {
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49 while (!hasCached && elements.hasNext()) {
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50 T element = elements.next();
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51 if (includePredicate.evaluate(element)) {
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52 cached = element;
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53 hasCached = true;
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54 }
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55 }
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56 }
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57
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58 public T next() {
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59 T foundCached = getCached();
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60 if (foundCached != null) {
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61 return foundCached;
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62 } else {
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63 nextValue();
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64 if (!hasCached) {
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65 throw new NoSuchElementException();
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66 }
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67 return getCached();
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68 }
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69 }
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70
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71 private T getCached() {
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72 if (hasCached) {
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73 hasCached = false;
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74 T value = cached;
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75 cached = null;
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76 return value;
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77 }
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78 return null;
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79 }
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80
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81 @Override
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82 public void remove() {
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83 elements.remove();
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84 }
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85
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86 }