Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/collect/FilterIterator.java @ 4184:fa6b78681c54
Added copyright check to the gate.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 12:37:31 +0100 |
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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 } |