| Clover coverage report - PLT Utilities Test Coverage (plt-20120304-r5436) |
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| Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
| CollapsedIterator.java | 0% | 0% | 0% | 0% |
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| 1 | /*BEGIN_COPYRIGHT_BLOCK* | |
| 2 | ||
| 3 | PLT Utilities BSD License | |
| 4 | ||
| 5 | Copyright (c) 2007-2010 JavaPLT group at Rice University | |
| 6 | All rights reserved. | |
| 7 | ||
| 8 | Developed by: Java Programming Languages Team | |
| 9 | Rice University | |
| 10 | http://www.cs.rice.edu/~javaplt/ | |
| 11 | ||
| 12 | Redistribution and use in source and binary forms, with or without modification, are permitted | |
| 13 | provided that the following conditions are met: | |
| 14 | ||
| 15 | - Redistributions of source code must retain the above copyright notice, this list of conditions | |
| 16 | and the following disclaimer. | |
| 17 | - Redistributions in binary form must reproduce the above copyright notice, this list of | |
| 18 | conditions and the following disclaimer in the documentation and/or other materials provided | |
| 19 | with the distribution. | |
| 20 | - Neither the name of the JavaPLT group, Rice University, nor the names of the library's | |
| 21 | contributors may be used to endorse or promote products derived from this software without | |
| 22 | specific prior written permission. | |
| 23 | ||
| 24 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR | |
| 25 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 26 | FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND | |
| 27 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 28 | DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 29 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER | |
| 30 | IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | |
| 31 | OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 32 | ||
| 33 | *END_COPYRIGHT_BLOCK*/ | |
| 34 | ||
| 35 | package edu.rice.cs.plt.iter; | |
| 36 | ||
| 37 | import java.util.Iterator; | |
| 38 | import edu.rice.cs.plt.object.Composite; | |
| 39 | import edu.rice.cs.plt.object.ObjectUtil; | |
| 40 | ||
| 41 | /** An iterator over an arbitrary number of iterators. Supports {@link #remove()}. */ | |
| 42 | public class CollapsedIterator<T> implements Iterator<T>, Composite { | |
| 43 | ||
| 44 | private Iterator<? extends T> _i; | |
| 45 | private Iterator<? extends T> _last; // to support remove() | |
| 46 | private final Iterator<? extends Iterator<? extends T>> _rest; | |
| 47 | ||
| 48 | /** The result traverses {@code i1}, then {@code i2} */ | |
| 49 | 0 | public CollapsedIterator(Iterator<? extends Iterator<? extends T>> iters) { |
| 50 | 0 | _i = EmptyIterator.make(); |
| 51 | 0 | _rest = iters; |
| 52 | 0 | advance(); |
| 53 | } | |
| 54 | ||
| 55 | 0 | public int compositeHeight() { return ObjectUtil.compositeHeight(_rest) + 1; } |
| 56 | 0 | public int compositeSize() { return ObjectUtil.compositeSize(_rest) + 1; } |
| 57 | ||
| 58 | 0 | public boolean hasNext() { return _i.hasNext(); } |
| 59 | ||
| 60 | 0 | public T next() { |
| 61 | 0 | T result = _i.next(); |
| 62 | 0 | _last = _i; |
| 63 | 0 | advance(); |
| 64 | 0 | return result; |
| 65 | } | |
| 66 | ||
| 67 | 0 | public void remove() { _last.remove(); } |
| 68 | ||
| 69 | 0 | private void advance() { |
| 70 | 0 | while (!_i.hasNext() && _rest.hasNext()) { _i = _rest.next(); } |
| 71 | } | |
| 72 | ||
| 73 | /** Call the constructor (allows {@code T} to be inferred) */ | |
| 74 | 0 | public static <T> CollapsedIterator<T> make(Iterator<? extends Iterator<? extends T>> iters) { |
| 75 | 0 | return new CollapsedIterator<T>(iters); |
| 76 | } | |
| 77 | ||
| 78 | } |
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