1 | package com.framsticks.params; |
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2 | |
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3 | import java.lang.reflect.Field; |
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4 | import java.lang.reflect.InvocationTargetException; |
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5 | import java.lang.reflect.Method; |
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6 | import java.util.Collections; |
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7 | import java.util.HashMap; |
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8 | import java.util.Map; |
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9 | |
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10 | import javax.annotation.concurrent.Immutable; |
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11 | |
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12 | import org.apache.log4j.Logger; |
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13 | |
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14 | import com.framsticks.params.annotations.AutoAppendAnnotation; |
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15 | import com.framsticks.util.FramsticksException; |
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16 | import com.framsticks.util.lang.Pair; |
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17 | |
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18 | import static com.framsticks.util.lang.Containers.*; |
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19 | |
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20 | /** |
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21 | * The Class ReflectionAccess. Stores data in provided object using reflection. |
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22 | * |
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23 | * @author Mateusz Jarus <name.surname@gmail.com> (please replace name and |
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24 | * surname with my personal data) |
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25 | * |
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26 | * @author Piotr Sniegowski |
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27 | */ |
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28 | public class ReflectionAccess extends SimpleAbstractAccess { |
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29 | private final static Logger log = Logger.getLogger(ReflectionAccess.class.getName()); |
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30 | |
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31 | protected final Class<?> reflectedClass; |
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32 | protected final Backend backend; |
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33 | |
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34 | private Object object; |
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35 | |
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36 | @Immutable |
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37 | public static class Backend { |
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38 | |
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39 | protected static Map<Pair<Class<?>, FramsClass>, Backend> synchronizedCache = Collections.synchronizedMap(new HashMap<Pair<Class<?>, FramsClass>, Backend>()); |
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40 | |
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41 | public static class ReflectedValueParam { |
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42 | public ReflectedSetter setter; |
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43 | public ReflectedGetter getter; |
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44 | } |
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45 | |
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46 | public interface ReflectedSetter { |
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47 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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48 | } |
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49 | |
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50 | public interface ReflectedGetter { |
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51 | public abstract <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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52 | } |
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53 | |
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54 | protected final Map<ValueParam, ReflectedValueParam> params; |
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55 | protected final Map<Class<?>, Method> autoAppendMethods; |
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56 | |
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57 | /** |
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58 | * @param params |
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59 | */ |
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60 | public Backend(Map<ValueParam, ReflectedValueParam> params, Map<Class<?>, Method> autoAppendMethods) { |
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61 | // this.params = Collections.unmodifiableMap(params); |
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62 | this.params = params; |
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63 | this.autoAppendMethods = autoAppendMethods; |
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64 | } |
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65 | |
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66 | public static Backend getOrCreateFor(Class<?> reflectedClass, FramsClass framsClass) { |
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67 | |
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68 | Pair<Class<?>, FramsClass> id = new Pair<Class<?>, FramsClass>(reflectedClass, framsClass); |
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69 | Backend backend = synchronizedCache.get(id); |
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70 | if (backend != null) { |
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71 | return backend; |
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72 | } |
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73 | |
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74 | log.debug("constructing backend for " + id); |
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75 | final Map<ValueParam, ReflectedValueParam> params = new HashMap<>(); |
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76 | |
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77 | Map<String, ParamCandidate> candidates = ParamCandidate.getAllCandidates(reflectedClass); |
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78 | |
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79 | try { |
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80 | for (final ValueParam vp : filterInstanceof(framsClass.getParamEntries(), ValueParam.class)) { |
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81 | if (!candidates.containsKey(vp.getId())) { |
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82 | throw new ConstructionException().msg("missing candidate for param").arg("param", vp); |
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83 | } |
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84 | ParamCandidate pc = candidates.get(vp.getId()); |
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85 | if (pc.isReadOnly() && !vp.hasFlag(Flags.READONLY)) { |
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86 | throw new ConstructionException().msg("readonly state conflict").arg("param", vp); |
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87 | } |
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88 | if (!typeMatch(pc.getRawType(), vp.getStorageType())) { |
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89 | throw new ConstructionException().msg("types mismatch for param").arg("param", vp).arg("candidate", pc.getType()).arg("storage", vp.getStorageType()); |
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90 | } |
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91 | |
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92 | ReflectedValueParam rvp = new ReflectedValueParam(); |
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93 | params.put(vp, rvp); |
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94 | final boolean primitive = pc.isPrimitive(); |
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95 | if (pc.getField() != null) { |
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96 | final Field f = pc.getField(); |
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97 | rvp.getter = new ReflectedGetter() { |
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98 | @Override |
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99 | public <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException { |
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100 | return type.cast(f.get(object)); |
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101 | } |
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102 | }; |
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103 | if (!pc.isFinal()) { |
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104 | rvp.setter = new ReflectedSetter() { |
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105 | @Override |
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106 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException { |
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107 | if (value == null && primitive) { |
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108 | throw new FramsticksException().msg("setting null to primitive value"); |
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109 | } |
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110 | f.set(object, value); |
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111 | } |
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112 | }; |
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113 | } |
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114 | } else { |
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115 | final Method g = pc.getGetter(); |
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116 | |
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117 | rvp.getter = new ReflectedGetter() { |
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118 | @Override |
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119 | public <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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120 | return type.cast(g.invoke(object)); |
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121 | } |
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122 | }; |
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123 | |
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124 | if (!pc.isFinal()) { |
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125 | final Method s = pc.getSetter(); |
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126 | rvp.setter = new ReflectedSetter() { |
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127 | @Override |
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128 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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129 | if (value == null && primitive) { |
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130 | throw new FramsticksException().msg("setting null to primitive value"); |
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131 | } |
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132 | s.invoke(object, value); |
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133 | } |
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134 | }; |
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135 | } |
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136 | } |
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137 | } |
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138 | } catch (ConstructionException e) { |
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139 | throw e.arg("java class", reflectedClass).arg("framsClass", framsClass); |
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140 | } |
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141 | |
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142 | Map<Class<?>, Method> autoAppendMethods = new HashMap<>(); |
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143 | |
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144 | Class<?> javaClass = reflectedClass; |
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145 | while (javaClass != null) { |
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146 | |
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147 | for (Method m : javaClass.getDeclaredMethods()) { |
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148 | AutoAppendAnnotation a = m.getAnnotation(AutoAppendAnnotation.class); |
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149 | if (a == null) { |
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150 | continue; |
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151 | } |
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152 | Class<?>[] args = m.getParameterTypes(); |
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153 | if (args.length != 1) { |
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154 | throw new ConstructionException().msg("invalid number of arguments in AutoAppend marked method").arg("method", m).arg("arguments", args.length); |
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155 | } |
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156 | autoAppendMethods.put(args[0], m); |
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157 | } |
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158 | |
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159 | javaClass = javaClass.getSuperclass(); |
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160 | } |
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161 | |
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162 | backend = new Backend(params, autoAppendMethods); |
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163 | synchronizedCache.put(id, backend); |
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164 | return backend; |
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165 | } |
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166 | |
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167 | } |
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168 | |
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169 | public ReflectionAccess(Class<?> reflectedClass) throws ConstructionException { |
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170 | this(reflectedClass, FramsClass.build().forClass(reflectedClass)); |
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171 | } |
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172 | |
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173 | public static boolean typeMatch(Class<?> a, Class<?> b) { |
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174 | assert !b.isPrimitive(); |
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175 | if (!a.isPrimitive()) { |
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176 | return a.equals(b); |
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177 | } |
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178 | |
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179 | if (a.equals(int.class)) { |
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180 | return b.equals(Integer.class); |
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181 | } |
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182 | if (a.equals(double.class)) { |
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183 | return b.equals(Double.class); |
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184 | } |
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185 | if (a.equals(boolean.class)) { |
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186 | return b.equals(Boolean.class); |
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187 | } |
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188 | assert false; |
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189 | return false; |
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190 | } |
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191 | |
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192 | public ReflectionAccess(Class<?> reflectedClass, FramsClass framsClass) throws ConstructionException { |
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193 | super(framsClass); |
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194 | this.reflectedClass = reflectedClass; |
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195 | this.backend = Backend.getOrCreateFor(reflectedClass, framsClass); |
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196 | // log.info("created ReflectionAccess " + this); |
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197 | } |
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198 | |
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199 | // private static String accessorName(boolean get, String id) { |
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200 | // return (get ? "get" : "set") + id.substring(0, 1).toUpperCase() + id.substring(1); |
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201 | // } |
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202 | |
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203 | @Override |
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204 | public <T> T get(ValueParam param, Class<T> type) { |
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205 | try { |
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206 | try { |
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207 | if (object == null) { |
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208 | throw new FramsticksException().msg("no object set"); |
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209 | } |
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210 | |
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211 | return backend.params.get(param).getter.get(object, type); |
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212 | } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { |
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213 | throw new FramsticksException().msg("failed to get").cause(e); |
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214 | } |
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215 | } catch (FramsticksException e) { |
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216 | throw e.arg("param", param).arg("type", type).arg("access", this); |
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217 | } |
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218 | } |
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219 | |
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220 | @Override |
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221 | protected <T> void internalSet(ValueParam param, T value) { |
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222 | setValue(param, value); |
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223 | } |
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224 | |
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225 | private <T> void setValue(ValueParam param, T value) { |
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226 | try { |
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227 | try { |
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228 | if (object == null) { |
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229 | throw new FramsticksException().msg("no object set"); |
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230 | } |
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231 | Backend.ReflectedSetter s = backend.params.get(param).setter; |
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232 | if (s == null) { |
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233 | throw new FramsticksException().msg("trying to set final"); |
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234 | } |
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235 | s.set(object, value); |
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236 | } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) { |
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237 | throw new FramsticksException().msg("failed to set").cause(e); |
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238 | } |
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239 | } catch (FramsticksException e) { |
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240 | throw e.arg("param", param).arg("value", value).arg("access", this); |
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241 | } |
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242 | } |
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243 | |
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244 | void resetErrors() { |
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245 | //TODO this replaces returnedObject.resetErrors(); |
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246 | } |
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247 | |
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248 | @Override |
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249 | public void clearValues() { |
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250 | if (object == null) { |
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251 | return; |
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252 | } |
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253 | |
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254 | resetErrors(); |
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255 | |
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256 | try { |
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257 | for (ValueParam p : filterInstanceof(framsClass.getParamEntries(), ValueParam.class)) { |
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258 | setValue(p, p.getDef(Object.class)); |
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259 | } |
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260 | } catch (IllegalArgumentException ex) { |
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261 | ex.printStackTrace(); |
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262 | } |
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263 | } |
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264 | |
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265 | /** |
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266 | * Sets the new object to operate on. |
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267 | * |
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268 | * @param object |
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269 | * new object to operate on |
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270 | */ |
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271 | @Override |
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272 | public ReflectionAccess select(Object object) { |
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273 | assert object == null || reflectedClass.isInstance(object); |
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274 | this.object = object; |
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275 | return this; |
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276 | } |
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277 | |
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278 | @Override |
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279 | public Object getSelected() { |
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280 | return object; |
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281 | } |
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282 | |
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283 | // TODO: find a better place for it |
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284 | public static String objectToString(Object object) { |
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285 | StringBuilder b = new StringBuilder(); |
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286 | for (Field f : object.getClass().getFields()) { |
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287 | b.append(f.getName()); |
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288 | b.append(":"); |
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289 | try { |
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290 | Object value = f.get(object); |
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291 | b.append((value != null) ? value.toString() : "<null>"); |
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292 | } catch (IllegalAccessException e) { |
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293 | e.printStackTrace(); |
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294 | } |
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295 | b.append("\n"); |
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296 | } |
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297 | return b.toString(); |
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298 | } |
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299 | |
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300 | @Override |
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301 | public ReflectionAccess cloneAccess() throws ConstructionException { |
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302 | return new ReflectionAccess(reflectedClass, framsClass); |
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303 | } |
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304 | |
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305 | @Override |
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306 | public Object createAccessee() { |
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307 | try { |
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308 | return reflectedClass.newInstance(); |
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309 | } catch (InstantiationException | IllegalAccessException e) { |
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310 | e.printStackTrace(); |
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311 | } |
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312 | log.fatal("failed to create reflected object of class " + reflectedClass.getCanonicalName() + " for frams type " + framsClass.getId()); |
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313 | return null; |
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314 | } |
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315 | |
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316 | @Override |
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317 | public String toString() { |
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318 | StringBuilder b = new StringBuilder(); |
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319 | b.append(framsClass); |
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320 | if (object != null) { |
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321 | b.append("(").append(object).append(")"); |
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322 | } |
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323 | return b.toString(); |
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324 | } |
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325 | |
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326 | @Override |
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327 | public boolean tryAutoAppend(Object value) { |
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328 | assert object != null; |
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329 | for (Map.Entry<Class<?>, Method> a : backend.autoAppendMethods.entrySet()) { |
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330 | if (a.getKey().isAssignableFrom(value.getClass())) { |
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331 | try { |
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332 | a.getValue().invoke(object, value); |
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333 | return true; |
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334 | } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { |
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335 | throw new FramsticksException().msg("failed to auto append").cause(e).arg("value", value).arg("into object", object).arg("with method", a.getValue()); |
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336 | } |
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337 | } |
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338 | } |
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339 | return false; |
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340 | } |
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341 | } |
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342 | |
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