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annotate src/luan/lib/JavaLib.java @ 86:6db8f286fa6c

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_ENV is per module, not global git-svn-id: https://luan-java.googlecode.com/svn/trunk@87 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 27 Feb 2013 08:03:51 +0000
parents 4bf3d0c0b6b9
children 6ca02b188dba
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1 package luan.lib;
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3 import java.lang.reflect.Array;
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4 import java.lang.reflect.AccessibleObject;
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5 import java.lang.reflect.Member;
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6 import java.lang.reflect.Field;
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7 import java.lang.reflect.Method;
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8 import java.lang.reflect.Constructor;
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9 import java.lang.reflect.Modifier;
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10 import java.lang.reflect.InvocationHandler;
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11 import java.lang.reflect.Proxy;
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12 import java.util.Map;
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13 import java.util.HashMap;
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14 import java.util.List;
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15 import java.util.ArrayList;
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16 import java.util.Iterator;
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17 import java.util.Collections;
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18 import luan.Luan;
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19 import luan.LuanState;
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20 import luan.LuanTable;
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21 import luan.MetatableGetter;
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22 import luan.LuanException;
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23 import luan.LuanFunction;
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24 import luan.LuanLoader;
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25 import luan.LuanJavaFunction;
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26 import luan.LuanElement;
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29 public final class JavaLib {
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31 public static final String NAME = "java";
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32
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33 public static final LuanLoader LOADER = new LuanLoader() {
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34 @Override protected void load(LuanState luan) {
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35 luan.addMetatableGetter(mg);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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36 LuanTable module = new LuanTable();
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37 LuanTable global = new LuanTable();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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38 module.put( LuanState._G, global );
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39 try {
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40 global.put( "import", new LuanJavaFunction(JavaLib.class.getMethod("importClass",LuanState.class,String.class),null) );
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41 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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42 add( module, "proxy", LuanState.class, Static.class, LuanTable.class, Object.class );
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43 } catch(NoSuchMethodException e) {
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44 throw new RuntimeException(e);
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45 }
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46 luan.loaded().put(NAME,module);
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47 }
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48 };
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50 private static final LuanTable mt = new LuanTable();
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51 static {
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52 add( mt, "__index", LuanState.class, Object.class, Object.class );
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53 add( mt, "__newindex", LuanState.class, Object.class, Object.class, Object.class );
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54 }
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56 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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57 try {
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58 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) );
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59 } catch(NoSuchMethodException e) {
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60 throw new RuntimeException(e);
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61 }
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62 }
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64 private static final MetatableGetter mg = new MetatableGetter() {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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65 public LuanTable getMetatable(Object obj) {
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66 if( obj==null )
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67 return null;
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68 return mt;
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69 }
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70 };
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71
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72 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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73 if( obj instanceof Static ) {
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74 if( key instanceof String ) {
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75 String name = (String)key;
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76 Static st = (Static)obj;
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77 Class cls = st.cls;
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78 if( "class".equals(name) ) {
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79 return cls;
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80 } else if( "new".equals(name) ) {
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81 Constructor<?>[] constructors = cls.getConstructors();
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82 if( constructors.length > 0 ) {
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83 if( constructors.length==1 ) {
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84 return new LuanJavaFunction(constructors[0],null);
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85 } else {
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86 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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87 for( Constructor constructor : constructors ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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88 fns.add(new LuanJavaFunction(constructor,null));
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89 }
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90 return new AmbiguousJavaFunction(fns);
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91 }
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92 }
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93 } else if( "assert".equals(name) ) {
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94 return new LuanJavaFunction(assertClass,new AssertClass(cls));
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95 } else {
56
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96 List<Member> members = getStaticMembers(cls,name);
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97 if( !members.isEmpty() ) {
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98 return member(null,members);
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99 }
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100 }
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101 }
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102 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
37
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103 }
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104 Class cls = obj.getClass();
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parents:
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105 if( cls.isArray() ) {
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106 if( "length".equals(key) ) {
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107 return Array.getLength(obj);
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parents:
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108 }
48
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diff changeset
109 Integer i = Luan.asInteger(key);
46
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parents: 44
diff changeset
110 if( i != null ) {
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parents: 44
diff changeset
111 return Array.get(obj,i);
37
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112 }
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diff changeset
113 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj);
37
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114 }
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115 if( key instanceof String ) {
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116 String name = (String)key;
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117 if( "instanceof".equals(name) ) {
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diff changeset
118 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
37
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119 } else {
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120 List<Member> members = getMembers(cls,name);
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121 if( !members.isEmpty() ) {
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122 return member(obj,members);
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123 }
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124 }
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125 }
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126 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj);
37
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127 }
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128
56
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129 private static Object member(Object obj,List<Member> members) throws LuanException {
37
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130 try {
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131 if( members.size()==1 ) {
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diff changeset
132 Member member = members.get(0);
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diff changeset
133 if( member instanceof Static ) {
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134 return member;
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135 } else if( member instanceof Field ) {
37
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136 Field field = (Field)member;
46
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diff changeset
137 return field.get(obj);
37
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138 } else {
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parents:
diff changeset
139 Method method = (Method)member;
48
64ecb7a3aad7 rename Lua to Luan
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
140 return new LuanJavaFunction(method,obj);
37
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141 }
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diff changeset
142 } else {
48
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diff changeset
143 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
56
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parents: 55
diff changeset
144 for( Member member : members ) {
37
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parents:
diff changeset
145 Method method = (Method)member;
48
64ecb7a3aad7 rename Lua to Luan
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
146 fns.add(new LuanJavaFunction(method,obj));
37
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147 }
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148 return new AmbiguousJavaFunction(fns);
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149 }
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150 } catch(IllegalAccessException e) {
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diff changeset
151 throw new RuntimeException(e);
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152 }
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153 }
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154
60
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diff changeset
155 public static void __newindex(LuanState luan,Object obj,Object key,Object value) throws LuanException {
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diff changeset
156 if( obj instanceof Static ) {
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parents: 58
diff changeset
157 if( key instanceof String ) {
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parents: 58
diff changeset
158 String name = (String)key;
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diff changeset
159 Static st = (Static)obj;
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diff changeset
160 Class cls = st.cls;
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parents: 58
diff changeset
161 List<Member> members = getStaticMembers(cls,name);
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parents: 58
diff changeset
162 if( !members.isEmpty() ) {
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parents: 58
diff changeset
163 if( members.size() != 1 )
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diff changeset
164 throw new RuntimeException("not field '"+name+"' of "+obj);
a68ccb7aaa9c implement setting java field values
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diff changeset
165 setMember(obj,members,value);
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diff changeset
166 return;
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parents: 58
diff changeset
167 }
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parents: 58
diff changeset
168 }
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diff changeset
169 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
a68ccb7aaa9c implement setting java field values
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parents: 58
diff changeset
170 }
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parents: 58
diff changeset
171 Class cls = obj.getClass();
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
172 if( cls.isArray() ) {
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
173 Integer i = Luan.asInteger(key);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
174 if( i != null ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
175 Array.set(obj,i,value);
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parents: 58
diff changeset
176 return;
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parents: 58
diff changeset
177 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
178 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java array: "+obj);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
179 }
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parents: 58
diff changeset
180 if( key instanceof String ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
181 String name = (String)key;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
182 List<Member> members = getMembers(cls,name);
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
183 if( !members.isEmpty() ) {
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
184 if( members.size() != 1 )
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
185 throw new RuntimeException("not field '"+name+"' of "+obj);
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
186 setMember(obj,members,value);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
187 return;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
188 }
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parents: 58
diff changeset
189 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
190 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for java object: "+obj);
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
191 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
192
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
193 private static void setMember(Object obj,List<Member> members,Object value) {
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
194 Field field = (Field)members.get(0);
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
195 try {
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
196 field.set(obj,value);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
197 } catch(IllegalAccessException e) {
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
198 throw new RuntimeException(e);
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
199 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
200 }
a68ccb7aaa9c implement setting java field values
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents: 58
diff changeset
201
56
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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202 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
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203
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204 private static synchronized List<Member> getMembers(Class cls,String name) {
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205 Map<String,List<Member>> clsMap = memberMap.get(cls);
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206 if( clsMap == null ) {
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207 clsMap = new HashMap<String,List<Member>>();
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208 for( Class c : cls.getClasses() ) {
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209 String s = c.getSimpleName();
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210 List<Member> list = new ArrayList<Member>();
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211 clsMap.put(s,list);
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212 list.add(new Static(c));
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213 }
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214 for( Field field : cls.getFields() ) {
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215 String s = field.getName();
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216 try {
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217 if( !cls.getField(s).equals(field) )
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218 continue; // not accessible
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219 } catch(NoSuchFieldException e) {
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220 throw new RuntimeException(e);
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221 }
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222 List<Member> list = new ArrayList<Member>();
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223 clsMap.put(s,list);
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224 list = new ArrayList<Member>();
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225 clsMap.put(s,list);
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226 list.add(field);
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227 }
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228 for( Method method : cls.getMethods() ) {
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229 String s = method.getName();
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230 List<Member> list = clsMap.get(s);
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231 if( list == null || !(list.get(0) instanceof Method) ) {
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232 list = new ArrayList<Member>();
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233 clsMap.put(s,list);
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234 }
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235 list.add(method);
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236 }
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237 for( List<Member> members : clsMap.values() ) {
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238 for( Member m : members ) {
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239 if( m instanceof AccessibleObject )
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240 ((AccessibleObject)m).setAccessible(true);
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241 }
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242 }
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243 memberMap.put(cls,clsMap);
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244 }
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245 List<Member> rtn = clsMap.get(name);
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246 if( rtn==null )
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247 rtn = Collections.emptyList();
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248 return rtn;
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249 }
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250
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251 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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252 List<Member> staticMembers = new ArrayList<Member>();
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253 for( Member m : getMembers(cls,name) ) {
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254 if( Modifier.isStatic(m.getModifiers()) )
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255 staticMembers.add(m);
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256 }
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257 return staticMembers;
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258 }
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259
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260 static final class Static implements Member {
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261 final Class cls;
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262
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263 Static(Class cls) {
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264 this.cls = cls;
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265 }
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266
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267 @Override public String toString() {
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268 return cls.toString();
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269 }
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270
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271 @Override public Class<?> getDeclaringClass() {
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272 return cls.getDeclaringClass();
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273 }
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274
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275 @Override public String getName() {
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276 return cls.getName();
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277 }
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278
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279 @Override public int getModifiers() {
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280 return cls.getModifiers();
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281 }
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282
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283 @Override public boolean isSynthetic() {
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284 return cls.isSynthetic();
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285 }
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286 }
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287
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288 public static Static getClass(LuanState luan,String name) throws LuanException {
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289 Class cls;
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290 try {
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291 cls = Class.forName(name);
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292 } catch(ClassNotFoundException e) {
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293 try {
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294 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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295 } catch(ClassNotFoundException e2) {
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296 throw new LuanException(luan,LuanElement.JAVA,e);
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297 }
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298 }
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299 return new Static(cls);
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300 }
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301
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302 public static void importClass(LuanState luan,String name) throws LuanException {
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303 luan.currentEnvironment().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
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304 }
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305
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diff changeset
306 static class AmbiguousJavaFunction extends LuanFunction {
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307 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
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308
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309 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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310 for( LuanJavaFunction fn : fns ) {
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311 Integer n = fn.getParameterTypes().length;
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312 List<LuanJavaFunction> list = fnMap.get(n);
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313 if( list==null ) {
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314 list = new ArrayList<LuanJavaFunction>();
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315 fnMap.put(n,list);
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316 }
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317 list.add(fn);
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318 }
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319 }
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320
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321 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException {
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322 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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323 try {
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324 return fn.rawCall(luan,args);
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325 } catch(IllegalArgumentException e) {}
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326 }
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327 throw new LuanException(luan,LuanElement.JAVA,"no method matched args");
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328 }
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329 }
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330
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331 private static class InstanceOf {
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332 private final Object obj;
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333
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334 InstanceOf(Object obj) {
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335 this.obj = obj;
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336 }
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337
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338 public boolean instanceOf(Static st) {
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339 return st.cls.isInstance(obj);
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340 }
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341 }
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342 private static final Method instanceOf;
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343 static {
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344 try {
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345 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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346 instanceOf.setAccessible(true);
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347 } catch(NoSuchMethodException e) {
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348 throw new RuntimeException(e);
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349 }
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350 }
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351
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352
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353 private static class AssertClass {
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354 private final Class cls;
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355
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356 AssertClass(Class cls) {
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357 this.cls = cls;
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358 }
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359
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360 public Object assertClass(LuanState luan,Object v) throws LuanException {
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361 if( !cls.isInstance(v) ) {
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362 String got = v.getClass().getSimpleName();
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363 String expected = cls.getSimpleName();
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364 throw new LuanException(luan,LuanElement.JAVA,"bad argument #1 ("+expected+" expected, got "+got+")");
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365 }
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366 return v;
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367 }
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368 }
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369 private static final Method assertClass;
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370 static {
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371 try {
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372 assertClass = AssertClass.class.getMethod("assertClass",LuanState.class,Object.class);
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373 assertClass.setAccessible(true);
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374 } catch(NoSuchMethodException e) {
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375 throw new RuntimeException(e);
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376 }
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377 }
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378
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379
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380 public static Object proxy(final LuanState luan,Static st,final LuanTable t,final Object base) throws LuanException {
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381 return Proxy.newProxyInstance(
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382 st.cls.getClassLoader(),
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383 new Class[]{st.cls},
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384 new InvocationHandler() {
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385 public Object invoke(Object proxy,Method method, Object[] args)
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386 throws Throwable
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387 {
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388 if( args==null )
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389 args = new Object[0];
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390 String name = method.getName();
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391 Object fnObj = t.get(name);
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392 if( fnObj==null && base!=null )
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393 return method.invoke(base,args);
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394 LuanFunction fn = luan.checkFunction(LuanElement.JAVA,fnObj);
61
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395 return Luan.first(luan.call(fn,LuanElement.JAVA,name,args));
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396 }
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397 }
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398 );
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399 }
37
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400 }