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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 Nov 2, 2009 */
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12
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13 package clojure.lang;
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14
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15 public final class KeywordLookupSite implements ILookupSite, ILookupThunk{
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16
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17 final int n;
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18 final Keyword k;
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19
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20 public KeywordLookupSite(int n, Keyword k){
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21 this.n = n;
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22 this.k = k;
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23 }
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24
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25 public Object fault(Object target, ILookupHost host){
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26 if(target instanceof IKeywordLookup)
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27 {
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28 return install(target, host);
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29 }
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30 else if(target instanceof ILookup)
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31 {
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32 host.swapThunk(n,ilookupThunk(target.getClass()));
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33 return ((ILookup) target).valAt(k);
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34 }
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35 host.swapThunk(n,this);
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36 return RT.get(target, k);
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37 }
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38
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39 public Object get(Object target){
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40 if(target instanceof IKeywordLookup || target instanceof ILookup)
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41 return this;
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42 return RT.get(target,k);
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43 }
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44
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45 private ILookupThunk ilookupThunk(final Class c){
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46 return new ILookupThunk(){
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47 public Object get(Object target){
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48 if(target != null && target.getClass() == c)
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49 return ((ILookup) target).valAt(k);
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50 return this;
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51 }
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52 };
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53 }
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54
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55 private Object install(Object target, ILookupHost host){
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56 ILookupThunk t = ((IKeywordLookup)target).getLookupThunk(k);
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57 if(t != null)
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58 {
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59 host.swapThunk(n,t);
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60 return t.get(target);
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61 }
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62 host.swapThunk(n,ilookupThunk(target.getClass()));
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63 return ((ILookup) target).valAt(k);
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64 }
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65 }
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