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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 Oct 4, 2007 */
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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.lang.reflect.InvocationHandler;
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16 import java.lang.reflect.Method;
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17
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18 public class ProxyHandler implements InvocationHandler{
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19 //method-name-string->fn
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20 final IPersistentMap fns;
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21
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22
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23 public ProxyHandler(IPersistentMap fns){
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24 this.fns = fns;
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25 }
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26
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27 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable{
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28 Class rt = method.getReturnType();
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29 IFn fn = (IFn) fns.valAt(method.getName());
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30 if(fn == null)
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31 {
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32 if(rt == Void.TYPE)
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33 return null;
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34 else if(method.getName().equals("equals"))
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35 {
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36 return proxy == args[0];
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37 }
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38 else if(method.getName().equals("hashCode"))
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39 {
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40 return System.identityHashCode(proxy);
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41 }
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42 else if(method.getName().equals("toString"))
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43 {
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44 return "Proxy: " + System.identityHashCode(proxy);
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45 }
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46 throw new UnsupportedOperationException();
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47 }
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48 Object ret = fn.applyTo(ArraySeq.create(args));
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49 if(rt == Void.TYPE)
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50 return null;
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51 else if(rt.isPrimitive())
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52 {
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53 if(rt == Character.TYPE)
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54 return ret;
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55 else if(rt == Integer.TYPE)
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56 return ((Number) ret).intValue();
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57 else if(rt == Long.TYPE)
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58 return ((Number) ret).longValue();
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59 else if(rt == Float.TYPE)
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60 return ((Number) ret).floatValue();
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61 else if(rt == Double.TYPE)
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62 return ((Number) ret).doubleValue();
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63 else if(rt == Boolean.TYPE && !(ret instanceof Boolean))
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64 return ret == null ? Boolean.FALSE : Boolean.TRUE;
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65 else if(rt == Byte.TYPE)
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66 return (byte) ((Number) ret).intValue();
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67 else if(rt == Short.TYPE)
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68 return (short) ((Number) ret).intValue();
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69 }
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70 return ret;
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71 }
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72 }
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