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1 /**
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2 * Copyright (c) Rich Hickey. All rights reserved.
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3 * The use and distribution terms for this software are covered by the
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4 * Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
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5 * which can be found in the file epl-v10.html at the root of this distribution.
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6 * By using this software in any fashion, you are agreeing to be bound by
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7 * the terms of this license.
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8 * You must not remove this notice, or any other, from this software.
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9 **/
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10
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11 /* rich May 24, 2009 */
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12
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13 package clojure.lang;
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14
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15 import java.io.Serializable;
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16
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17 public final class ArrayChunk implements IChunk, Serializable {
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18
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19 final Object[] array;
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20 final int off;
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21 final int end;
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22
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23 public ArrayChunk(Object[] array){
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24 this(array, 0, array.length);
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25 }
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26
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27 public ArrayChunk(Object[] array, int off){
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28 this(array, off, array.length);
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29 }
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30
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31 public ArrayChunk(Object[] array, int off, int end){
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32 this.array = array;
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33 this.off = off;
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34 this.end = end;
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35 }
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36
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37 public Object nth(int i){
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38 return array[off + i];
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39 }
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40
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41 public Object nth(int i, Object notFound){
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42 if(i >= 0 && i < count())
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43 return nth(i);
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44 return notFound;
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45 }
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46
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47 public int count(){
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48 return end - off;
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49 }
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50
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51 public IChunk dropFirst(){
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52 if(off==end)
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53 throw new IllegalStateException("dropFirst of empty chunk");
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54 return new ArrayChunk(array, off + 1, end);
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55 }
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56
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57 public Object reduce(IFn f, Object start) throws Exception{
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58 Object ret = f.invoke(start, array[off]);
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59 for(int x = off + 1; x < end; x++)
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60 ret = f.invoke(ret, array[x]);
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61 return ret;
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62 }
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63 }
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