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annotate src/luan/lib/JavaLib.java @ 58:d6c454b7f58c

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make concat work with any type; improve JavaLib.getMembers(); git-svn-id: https://luan-java.googlecode.com/svn/trunk@59 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Mon, 07 Jan 2013 00:18:35 +0000
parents c84274b18f0c
children a68ccb7aaa9c
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diff changeset
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.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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15 import java.util.Collections;
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16 import luan.Luan;
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17 import luan.LuanState;
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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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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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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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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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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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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 {
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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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54 private static final MetatableGetter mg = new MetatableGetter() {
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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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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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84 List<Member> 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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90 throw new LuanException(luan,LuanElement.JAVA,"invalid member '"+key+"' for: "+obj);
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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 member '"+key+"' for java array: "+obj);
37
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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));
37
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107 } else {
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108 List<Member> 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 '"+key+"' for java object: "+obj);
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115 }
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116
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117 private static Object member(Object obj,List<Member> members) throws LuanException {
37
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118 try {
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119 for( Member m : members ) {
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120 if( m instanceof AccessibleObject )
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121 ((AccessibleObject)m).setAccessible(true);
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122 }
37
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123 if( members.size()==1 ) {
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124 Member member = members.get(0);
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125 if( member instanceof Static ) {
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126 return member;
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127 } else if( member instanceof Field ) {
37
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128 Field field = (Field)member;
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129 return field.get(obj);
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130 } else {
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131 Method method = (Method)member;
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132 return new LuanJavaFunction(method,obj);
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133 }
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134 } else {
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135 List<LuanJavaFunction> fns = new ArrayList<LuanJavaFunction>();
56
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136 for( Member member : members ) {
37
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137 Method method = (Method)member;
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138 fns.add(new LuanJavaFunction(method,obj));
37
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139 }
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140 return new AmbiguousJavaFunction(fns);
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141 }
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142 } catch(IllegalAccessException e) {
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143 throw new RuntimeException(e);
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144 }
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145 }
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146
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diff changeset
147 private static Map<Class,Map<String,List<Member>>> memberMap = new HashMap<Class,Map<String,List<Member>>>();
37
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148
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149 private static synchronized List<Member> getMembers(Class cls,String name) {
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150 Map<String,List<Member>> clsMap = memberMap.get(cls);
37
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151 if( clsMap == null ) {
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152 clsMap = new HashMap<String,List<Member>>();
58
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153 for( Method method : cls.getMethods() ) {
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154 String s = method.getName();
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155 List<Member> list = clsMap.get(s);
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156 if( list == null ) {
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157 list = new ArrayList<Member>();
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diff changeset
158 clsMap.put(s,list);
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159 }
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diff changeset
160 list.add(method);
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161 }
56
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diff changeset
162 for( Class c : cls.getClasses() ) {
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163 String s = c.getSimpleName();
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164 List<Member> list = clsMap.get(s);
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165 if( list == null ) {
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166 list = new ArrayList<Member>();
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167 clsMap.put(s,list);
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168 }
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169 list.add(new Static(c));
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170 }
37
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171 for( Field field : cls.getFields() ) {
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172 String s = field.getName();
58
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173 try {
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174 if( !cls.getField(s).equals(field) )
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diff changeset
175 continue; // not accessible
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diff changeset
176 } catch(NoSuchFieldException e) {
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177 throw new RuntimeException(e);
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178 }
56
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179 List<Member> list = clsMap.get(s);
58
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180 if( list != null )
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181 throw new RuntimeException("can't add field '"+s+"' to "+cls+" because these are already defined: "+list);
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182 list = new ArrayList<Member>();
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183 clsMap.put(s,list);
37
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184 list.add(field);
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185 }
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186 memberMap.put(cls,clsMap);
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187 }
56
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diff changeset
188 List<Member> rtn = clsMap.get(name);
55
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diff changeset
189 if( rtn==null )
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diff changeset
190 rtn = Collections.emptyList();
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diff changeset
191 return rtn;
37
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192 }
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193
56
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diff changeset
194 private static synchronized List<Member> getStaticMembers(Class cls,String name) {
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195 List<Member> staticMembers = new ArrayList<Member>();
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196 for( Member m : getMembers(cls,name) ) {
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197 if( Modifier.isStatic(m.getModifiers()) )
37
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198 staticMembers.add(m);
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199 }
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200 return staticMembers;
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201 }
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diff changeset
202
56
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203 static final class Static implements Member {
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204 final Class cls;
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205
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206 Static(Class cls) {
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207 this.cls = cls;
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208 }
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209
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210 @Override public String toString() {
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211 return cls.toString();
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212 }
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213
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214 @Override public Class<?> getDeclaringClass() {
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215 return cls.getDeclaringClass();
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216 }
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217
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218 @Override public String getName() {
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219 return cls.getName();
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220 }
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221
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222 @Override public int getModifiers() {
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223 return cls.getModifiers();
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224 }
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225
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226 @Override public boolean isSynthetic() {
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227 return cls.isSynthetic();
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228 }
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229 }
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230
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231 public static Static getClass(LuanState luan,String name) throws LuanException {
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232 Class cls;
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233 try {
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234 cls = Class.forName(name);
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235 } catch(ClassNotFoundException e) {
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236 try {
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237 cls = Thread.currentThread().getContextClassLoader().loadClass(name);
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238 } catch(ClassNotFoundException e2) {
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239 throw new LuanException(luan,LuanElement.JAVA,e);
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240 }
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241 }
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242 return new Static(cls);
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243 }
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244
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245 public static void importClass(LuanState luan,String name) throws LuanException {
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246 luan.global().put( name.substring(name.lastIndexOf('.')+1), getClass(luan,name) );
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247 }
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248
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249 static class AmbiguousJavaFunction extends LuanFunction {
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250 private final Map<Integer,List<LuanJavaFunction>> fnMap = new HashMap<Integer,List<LuanJavaFunction>>();
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251
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252 AmbiguousJavaFunction(List<LuanJavaFunction> fns) {
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253 for( LuanJavaFunction fn : fns ) {
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254 Integer n = fn.getParameterTypes().length;
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255 List<LuanJavaFunction> list = fnMap.get(n);
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256 if( list==null ) {
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257 list = new ArrayList<LuanJavaFunction>();
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258 fnMap.put(n,list);
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259 }
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260 list.add(fn);
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261 }
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262 }
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263
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264 @Override public Object[] call(LuanState luan,Object[] args) throws LuanException {
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265 for( LuanJavaFunction fn : fnMap.get(args.length) ) {
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266 try {
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267 return fn.rawCall(luan,args);
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268 } catch(IllegalArgumentException e) {}
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269 }
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270 throw new LuanException(luan,LuanElement.JAVA,"no method matched args");
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271 }
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272 }
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273
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274 private static class InstanceOf {
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275 private final Object obj;
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276
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277 InstanceOf(Object obj) {
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278 this.obj = obj;
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279 }
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280
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281 public boolean instanceOf(Static st) {
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282 return st.cls.isInstance(obj);
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283 }
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284 }
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285 private static final Method instanceOf;
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286 static {
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287 try {
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288 instanceOf = InstanceOf.class.getMethod("instanceOf",Static.class);
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289 instanceOf.setAccessible(true);
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290 } catch(NoSuchMethodException e) {
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291 throw new RuntimeException(e);
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292 }
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293 }
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294
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295 }