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annotate graal/com.oracle.max.base/src/com/sun/max/collect/FilterIterator.java @ 4240:394424b7df1a

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Disabled certain DaCapo tests for fastdebug testing in the gate.
author Doug Simon <doug.simon@oracle.com>
date Fri, 06 Jan 2012 18:35:39 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, 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.sun.max.collect;
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24
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25 import java.util.*;
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26
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27 import com.sun.max.util.*;
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28
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29 /**
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30 * Filters the elements returned by a given iterator with a given predicate.
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31 */
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32 public class FilterIterator<T> implements Iterator<T> {
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33
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34 private final Iterator<? extends T> iterator;
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35 private final Predicate<T> predicate;
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36 private T next;
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37 private boolean advanced;
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38
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39 public FilterIterator(Iterator<? extends T> iterator, Predicate<T> predicate) {
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40 this.iterator = iterator;
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41 this.predicate = predicate;
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42 }
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43
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44 public boolean hasNext() {
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45 if (advanced) {
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46 return true;
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47 }
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48 return advance();
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49 }
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50
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51 public T next() {
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52 if (!advanced) {
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53 if (!advance()) {
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54 throw new NoSuchElementException();
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55 }
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56 }
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57 advanced = false;
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58 return next;
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59 }
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60
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61 public void remove() {
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62 if (advanced) {
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63 throw new IllegalStateException("remove() cannot be called");
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64 }
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65 iterator.remove();
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66 }
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67
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68 private boolean advance() {
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69 while (iterator.hasNext()) {
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70 final T n = iterator.next();
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71 if (predicate.evaluate(n)) {
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72 next = n;
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73 advanced = true;
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74 return true;
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75 }
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76 }
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77 return false;
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78 }
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79 }