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annotate java/src/java/util/WeakHashMap.d @ 21:9b96950f2c3c

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the 'java' tree compiles on both D1-Tango and D2-Phobos
author Frank Benoit <benoit@tionex.de>
date Thu, 19 Mar 2009 20:38:55 +0100
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1 module java.util.WeakHashMap;
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4 private {
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5 alias void delegate(Object) DisposeEvt;
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6 extern (C) void rt_attachDisposeEvent( Object obj, DisposeEvt evt );
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7 extern (C) void rt_detachDisposeEvent( Object obj, DisposeEvt evt );
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8 }
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11 /+
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12 Is not yet 'weak'
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13 +/
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14 class WeakHashMap {
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15
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16 static class Ref {
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17 size_t ptr;
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18 this(Object k){
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19 ptr = cast(size_t)cast(void*)k;
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20 }
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21 override hash_t toHash(){
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22 return cast(hash_t)ptr;
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23 }
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24 override equals_t opEquals( Object o ){
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25 if( auto other = cast(Ref)o ){
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26 return ptr is other.ptr;
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27 }
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28 return false;
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29 }
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30 }
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32 private Ref unhookKey;
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33
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34 private void unhook(Object o) {
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35 unhookKey.ptr = cast(size_t)cast(void*)o;
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36 if( auto p = unhookKey in data ){
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37 rt_detachDisposeEvent(o, &unhook);
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38 data.remove( unhookKey );
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39 }
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40 }
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41
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42 Object[ Ref ] data;
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43 ClassInfo gcLock;
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44 this(){
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45 unhookKey = new Ref(null);
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46 gcLock = ClassInfo.find( "gcx.GCLock" );
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47 }
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48
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49 public void put (Object key, Object element){
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50 auto k = new Ref(key);
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51 rt_attachDisposeEvent(key, &unhook);
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52 data[ k ] = element;
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53 }
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54 public void remove (Object key){
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55 scope k = new Ref(key);
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56 if( auto p = k in data ){
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57 data.remove( k );
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58 rt_detachDisposeEvent(key, &unhook);
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59 }
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60 }
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61 public Object get(Object key){
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62 scope k = new Ref(key);
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63 if( auto p = k in data ){
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64 return *p;
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65 }
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66 return null;
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67 }
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68 }