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annotate src/luan/lib/JavaLib.java @ 55:9381b23ea9e1

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various fixes git-svn-id: https://luan-java.googlecode.com/svn/trunk@56 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 04 Jan 2013 04:50:18 +0000
parents 28dfd91a816c
children c84274b18f0c
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
1 package luan.lib;
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2
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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.util.Map;
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11 import java.util.HashMap;
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12 import java.util.List;
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13 import java.util.ArrayList;
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14 import java.util.Iterator;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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15 import java.util.Collections;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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16 import luan.Luan;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 import luan.LuanState;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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18 import luan.LuanTable;
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19 import luan.MetatableGetter;
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20 import luan.LuanException;
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21 import luan.LuanFunction;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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22 import luan.LuanJavaFunction;
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23 import luan.LuanElement;
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26 public final class JavaLib {
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27
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28 public static void register(LuanState luan) {
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29 luan.addMetatableGetter(mg);
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30 LuanTable module = new LuanTable();
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31 LuanTable global = luan.global();
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32 global.put("java",module);
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33 try {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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34 global.put( "import", new LuanJavaFunction(JavaLib.class.getMethod("importClass",LuanState.class,String.class),null) );
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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35 module.put( "class", new LuanJavaFunction(JavaLib.class.getMethod("getClass",LuanState.class,String.class),null) );
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8a57ebfdfd78 add JavaLib
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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36 } catch(NoSuchMethodException e) {
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37 throw new RuntimeException(e);
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38 }
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39 }
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40
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41 private static final LuanTable mt = new LuanTable();
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42 static {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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43 add( mt, "__index", LuanState.class, Object.class, Object.class );
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44 }
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45
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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46 private static void add(LuanTable t,String method,Class<?>... parameterTypes) {
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47 try {
48
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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48 t.put( method, new LuanJavaFunction(JavaLib.class.getMethod(method,parameterTypes),null) );
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49 } catch(NoSuchMethodException e) {
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50 throw new RuntimeException(e);
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51 }
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52 }
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53
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54 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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55 public LuanTable getMetatable(Object obj) {
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56 if( obj==null )
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57 return null;
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58 return mt;
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59 }
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60 };
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61
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62 public static Object __index(LuanState luan,Object obj,Object key) throws LuanException {
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63 if( obj instanceof Static ) {
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64 if( key instanceof String ) {
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65 String name = (String)key;
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66 Static st = (Static)obj;
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67 Class cls = st.cls;
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68 if( "class".equals(name) ) {
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69 return cls;
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70 } else if( "new".equals(name) ) {
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71 Constructor<?>[] constructors = cls.getConstructors();
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72 if( constructors.length > 0 ) {
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73 if( constructors.length==1 ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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74 return new LuanJavaFunction(constructors[0],null);
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75 } else {
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76 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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77 for( Constructor constructor : constructors ) {
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78 fns.add(new LuanJavaFunction(constructor,null));
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79 }
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80 return new AmbiguousJavaFunction(fns);
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81 }
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82 }
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83 } else {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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84 List<AccessibleObject> members = getStaticMembers(cls,name);
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85 if( !members.isEmpty() ) {
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86 return member(null,members);
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87 }
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88 }
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89 }
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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90 throw new LuanException(luan,LuanElement.JAVA,"invalid index for java class: "+key);
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91 }
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92 Class cls = obj.getClass();
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93 if( cls.isArray() ) {
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94 if( "length".equals(key) ) {
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95 return Array.getLength(obj);
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96 }
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97 Integer i = Luan.asInteger(key);
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98 if( i != null ) {
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99 return Array.get(obj,i);
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100 }
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101 throw new LuanException(luan,LuanElement.JAVA,"invalid index for java array: "+key);
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102 }
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103 if( key instanceof String ) {
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104 String name = (String)key;
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105 if( "instanceof".equals(name) ) {
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106 return new LuanJavaFunction(instanceOf,new InstanceOf(obj));
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107 } else {
50
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108 List<AccessibleObject> members = getMembers(cls,name);
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109 if( !members.isEmpty() ) {
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110 return member(obj,members);
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111 }
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112 }
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113 }
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114 throw new LuanException(luan,LuanElement.JAVA,"invalid member for java object: "+key);
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115 }
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116
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117 private static Object member(Object obj,List<AccessibleObject> members) throws LuanException {
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118 try {
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119 for( AccessibleObject m : members ) {
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120 m.setAccessible(true);
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121 }
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122 if( members.size()==1 ) {
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123 AccessibleObject member = members.get(0);
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124 if( member instanceof Field ) {
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125 Field field = (Field)member;
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126 return field.get(obj);
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127 } else {
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128 Method method = (Method)member;
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129 return new LuanJavaFunction(method,obj);
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130 }
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131 } else {
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132 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
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133 for( AccessibleObject member : members ) {
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134 Method method = (Method)member;
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135 fns.add(new LuanJavaFunction(method,obj));
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136 }
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137 return new AmbiguousJavaFunction(fns);
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138 }
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139 } catch(IllegalAccessException e) {
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140 throw new RuntimeException(e);
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141 }
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142 }
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143
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144 private static Map<Class,Map<String,List<AccessibleObject>>> memberMap = new HashMap<Class,Map<String,List<AccessibleObject>>>();
37
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145
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146 private static synchronized List<AccessibleObject> getMembers(Class cls,String name) {
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147 Map<String,List<AccessibleObject>> clsMap = memberMap.get(cls);
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148 if( clsMap == null ) {
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149 clsMap = new HashMap<String,List<AccessibleObject>>();
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150 for( Field field : cls.getFields() ) {
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151 String s = field.getName();
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152 List<AccessibleObject> list = clsMap.get(s);
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153 if( list == null ) {
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154 list = new ArrayList<AccessibleObject>();
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155 clsMap.put(s,list);
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156 }
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157 list.add(field);
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158 }
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159 for( Method method : cls.getMethods() ) {
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160 String s = method.getName();
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161 List<AccessibleObject> list = clsMap.get(s);
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162 if( list == null ) {
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163 list = new ArrayList<AccessibleObject>();
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164 clsMap.put(s,list);
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165 }
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166 list.add(method);
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167 }
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168 memberMap.put(cls,clsMap);
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169 }
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170 List<AccessibleObject> rtn = clsMap.get(name);
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171 if( rtn==null )
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172 rtn = Collections.emptyList();
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173 return rtn;
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174 }
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175
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176 private static synchronized List<AccessibleObject> getStaticMembers(Class cls,String name) {
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177 List<AccessibleObject> staticMembers = new ArrayList<AccessibleObject>();
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178 for( AccessibleObject m : getMembers(cls,name) ) {
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179 if( Modifier.isStatic(((Member)m).getModifiers()) )
37
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180 staticMembers.add(m);
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181 }
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182 return staticMembers;
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183 }
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184
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185 static class Static {
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186 final Class cls;
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187
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188 Static(Class cls) {
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189 this.cls = cls;
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190 }
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191 }
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192
49
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193 public static Static getClass(LuanState luan,String name) throws LuanException {
51
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194 Class cls;
37
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195 try {
51
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196 cls = Class.forName(name);
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197 } catch(ClassNotFoundException e) {
51
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198 try {
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199 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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200 } catch(ClassNotFoundException e2) {
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diff changeset
201 throw new LuanException(luan,LuanElement.JAVA,e);
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202 }
37
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203 }
51
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204 return new Static(cls);
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205 }
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206
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207 public static void importClass(LuanState luan,String name) throws LuanException {
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208 luan.global().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
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209 }
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210
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211 static class AmbiguousJavaFunction extends LuanFunction {
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212 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
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213
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214 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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215 for( LuanJavaFunction fn : fns ) {
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216 Integer n = fn.getParameterTypes().length;
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217 List<LuanJavaFunction> list = fnMap.get(n);
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218 if( list==null ) {
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219 list = new ArrayList<LuanJavaFunction>();
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220 fnMap.put(n,list);
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221 }
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222 list.add(fn);
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223 }
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224 }
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225
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226 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException {
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227 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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228 try {
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229 return fn.rawCall(luan,args);
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230 } catch(IllegalArgumentException e) {}
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231 }
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232 throw new LuanException(luan,LuanElement.JAVA,"no method matched args");
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233 }
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234 }
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235
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236 private static class InstanceOf {
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237 private final Object obj;
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238
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239 InstanceOf(Object obj) {
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240 this.obj = obj;
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241 }
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242
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243 public boolean instanceOf(Static st) {
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244 return st.cls.isInstance(obj);
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245 }
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246 }
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247 private static final Method instanceOf;
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248 static {
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249 try {
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250 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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251 instanceOf.setAccessible(true);
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252 } catch(NoSuchMethodException e) {
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253 throw new RuntimeException(e);
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254 }
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255 }
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256
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257 }