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comparison core/src/luan/LuanPropertyMeta.java @ 415:ce8e19567911

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make LuanPropertyMeta a singleton
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 30 Apr 2015 06:04:17 -0600
parents 8937263f59f6
children 91af5337b9ae
comparison
equal deleted inserted replaced
414:d2ab2240cc65 415:ce8e19567911
2 2
3 import java.util.Map; 3 import java.util.Map;
4 import java.util.Iterator; 4 import java.util.Iterator;
5 5
6 6
7 public final class LuanPropertyMeta extends LuanMeta implements DeepCloneable<LuanPropertyMeta> { 7 public final class LuanPropertyMeta extends LuanMeta {
8 private LuanTable getters; 8 public static final LuanPropertyMeta INSTANCE = new LuanPropertyMeta();
9 private LuanTable setters;
10 9
11 private LuanPropertyMeta() {} 10 private LuanPropertyMeta() {}
12 11
13 public static LuanPropertyMeta newInstance() { 12 public LuanTable getters(LuanTable tbl) {
14 LuanPropertyMeta meta = new LuanPropertyMeta(); 13 return (LuanTable)tbl.getMetatable().get("get");
15 meta.getters = new LuanTable();
16 meta.setters = new LuanTable();
17 return meta;
18 } 14 }
19 15
20 public LuanTable getters() { 16 public LuanTable setters(LuanTable tbl) {
21 return getters; 17 return (LuanTable)tbl.getMetatable().get("set");
22 }
23
24 public LuanTable setters() {
25 return setters;
26 }
27
28 @Override public LuanPropertyMeta shallowClone() {
29 return new LuanPropertyMeta();
30 }
31
32 @Override public void deepenClone(LuanPropertyMeta clone,DeepCloner cloner) {
33 clone.getters = cloner.get(getters);
34 clone.setters = cloner.get(setters);
35 } 18 }
36 19
37 @Override public Object __index(LuanState luan,LuanTable tbl,Object key) throws LuanException { 20 @Override public Object __index(LuanState luan,LuanTable tbl,Object key) throws LuanException {
38 Object obj = getters.get(key); 21 Object obj = getters(tbl).get(key);
39 if( obj == null ) 22 if( obj == null )
40 return null; 23 return null;
41 if( !(obj instanceof LuanFunction) ) 24 if( !(obj instanceof LuanFunction) )
42 throw luan.exception("get for '"+key+"' isn't a function"); 25 throw luan.exception("get for '"+key+"' isn't a function");
43 LuanFunction fn = (LuanFunction)obj; 26 LuanFunction fn = (LuanFunction)obj;
44 return luan.call(fn); 27 return luan.call(fn);
45 } 28 }
46 29
47 @Override protected Iterator keys() { 30 @Override protected Iterator keys(final LuanTable tbl) {
48 return new Iterator() { 31 return new Iterator() {
49 final Iterator<Map.Entry<Object,Object>> iter = getters.iterator(); 32 final Iterator<Map.Entry<Object,Object>> iter = getters(tbl).iterator();
50 33
51 @Override public boolean hasNext() { 34 @Override public boolean hasNext() {
52 return iter.hasNext(); 35 return iter.hasNext();
53 } 36 }
54 @Override public Object next() { 37 @Override public Object next() {
64 @Override public boolean canNewindex() { 47 @Override public boolean canNewindex() {
65 return true; 48 return true;
66 } 49 }
67 50
68 @Override public void __newindex(LuanState luan,LuanTable tbl,Object key,Object value) throws LuanException { 51 @Override public void __newindex(LuanState luan,LuanTable tbl,Object key,Object value) throws LuanException {
69 Object obj = setters.get(key); 52 Object obj = setters(tbl).get(key);
70 if( obj == null ) 53 if( obj == null )
71 throw luan.exception("can't set property '"+key+"'"); 54 throw luan.exception("can't set property '"+key+"'");
72 if( !(obj instanceof LuanFunction) ) 55 if( !(obj instanceof LuanFunction) )
73 throw luan.exception("set for '"+key+"' isn't a function"); 56 throw luan.exception("set for '"+key+"' isn't a function");
74 LuanFunction fn = (LuanFunction)obj; 57 LuanFunction fn = (LuanFunction)obj;
75 luan.call(fn,new Object[]{value}); 58 luan.call(fn,new Object[]{value});
76 } 59 }
77 60
78 @Override public LuanTable newMetatable() { 61 @Override public LuanTable newMetatable() {
79 LuanTable mt = super.newMetatable(); 62 LuanTable mt = super.newMetatable();
80 mt.put( "get", getters ); 63 mt.put( "get", new LuanTable() );
81 mt.put( "set", setters ); 64 mt.put( "set", new LuanTable() );
82 return mt; 65 return mt;
83 } 66 }
84 67
85 } 68 }