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.LinkedList; |
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9 | import java.util.List; |
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10 | import java.util.Map; |
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11 | |
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12 | import javax.annotation.concurrent.Immutable; |
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13 | |
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14 | import org.apache.log4j.Logger; |
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15 | |
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16 | import com.framsticks.params.annotations.AutoAppendAnnotation; |
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17 | import com.framsticks.util.FramsticksException; |
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18 | import com.framsticks.util.lang.Pair; |
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19 | |
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20 | import static com.framsticks.util.lang.Containers.*; |
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21 | |
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22 | /** |
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23 | * The Class ReflectionAccess. Stores data in provided object using reflection. |
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24 | * |
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25 | * @author Mateusz Jarus <name.surname@gmail.com> (please replace name and |
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26 | * surname with my personal data) |
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27 | * |
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28 | * @author Piotr Sniegowski |
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29 | */ |
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30 | public class ReflectionAccess extends SimpleAbstractAccess { |
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31 | private final static Logger log = Logger.getLogger(ReflectionAccess.class.getName()); |
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32 | |
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33 | protected final Class<?> reflectedClass; |
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34 | protected final Backend backend; |
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35 | |
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36 | private Object object; |
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37 | |
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38 | @Immutable |
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39 | public static class Backend { |
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40 | |
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41 | protected static final Map<Pair<Class<?>, FramsClass>, Backend> synchronizedCache = Collections.synchronizedMap(new HashMap<Pair<Class<?>, FramsClass>, Backend>()); |
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42 | |
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43 | public static class ReflectedValueParam { |
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44 | public ReflectedSetter setter; |
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45 | public ReflectedGetter getter; |
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46 | } |
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47 | |
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48 | public interface ReflectedSetter { |
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49 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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50 | } |
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51 | |
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52 | public interface ReflectedGetter { |
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53 | public abstract <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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54 | } |
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55 | |
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56 | protected final Map<ValueParam, ReflectedValueParam> params; |
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57 | protected final List<Method> autoAppendMethods; |
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58 | |
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59 | /** |
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60 | * @param params |
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61 | */ |
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62 | public Backend(Map<ValueParam, ReflectedValueParam> params, List<Method> autoAppendMethods) { |
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63 | // this.params = Collections.unmodifiableMap(params); |
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64 | this.params = params; |
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65 | this.autoAppendMethods = autoAppendMethods; |
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66 | } |
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67 | |
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68 | public static Backend getOrCreateFor(Class<?> reflectedClass, FramsClass framsClass) { |
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69 | |
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70 | Pair<Class<?>, FramsClass> id = new Pair<Class<?>, FramsClass>(reflectedClass, framsClass); |
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71 | Backend backend = synchronizedCache.get(id); |
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72 | if (backend != null) { |
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73 | return backend; |
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74 | } |
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75 | |
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76 | log.debug("constructing backend for " + id); |
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77 | final Map<ValueParam, ReflectedValueParam> params = new HashMap<>(); |
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78 | |
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79 | Map<String, ParamCandidate> candidates = ParamCandidate.getAllCandidates(reflectedClass); |
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80 | |
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81 | try { |
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82 | for (final ValueParam vp : filterInstanceof(framsClass.getParamEntries(), ValueParam.class)) { |
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83 | if (!candidates.containsKey(vp.getId())) { |
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84 | throw new ConstructionException().msg("missing candidate for param").arg("param", vp); |
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85 | } |
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86 | ParamCandidate pc = candidates.get(vp.getId()); |
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87 | if (pc.isReadOnly() && !vp.hasFlag(Flags.READONLY)) { |
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88 | throw new ConstructionException().msg("readonly state conflict").arg("param", vp); |
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89 | } |
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90 | if (!typeMatch(pc.getRawType(), vp.getStorageType())) { |
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91 | throw new ConstructionException().msg("types mismatch for param").arg("param", vp).arg("candidate", pc.getType()).arg("storage", vp.getStorageType()); |
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92 | } |
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93 | |
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94 | ReflectedValueParam rvp = new ReflectedValueParam(); |
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95 | params.put(vp, rvp); |
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96 | final boolean primitive = pc.isPrimitive(); |
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97 | if (pc.getField() != null) { |
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98 | final Field f = pc.getField(); |
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99 | rvp.getter = new ReflectedGetter() { |
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100 | @Override |
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101 | public <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException { |
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102 | return type.cast(f.get(object)); |
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103 | } |
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104 | }; |
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105 | if (!pc.isFinal()) { |
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106 | rvp.setter = new ReflectedSetter() { |
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107 | @Override |
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108 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException { |
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109 | if (value == null && primitive) { |
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110 | throw new FramsticksException().msg("setting null to primitive value"); |
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111 | } |
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112 | f.set(object, value); |
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113 | } |
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114 | }; |
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115 | } |
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116 | } else { |
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117 | final Method g = pc.getGetter(); |
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118 | |
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119 | rvp.getter = new ReflectedGetter() { |
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120 | @Override |
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121 | public <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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122 | return type.cast(g.invoke(object)); |
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123 | } |
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124 | }; |
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125 | |
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126 | if (!pc.isFinal()) { |
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127 | final Method s = pc.getSetter(); |
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128 | rvp.setter = new ReflectedSetter() { |
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129 | @Override |
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130 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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131 | if (value == null && primitive) { |
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132 | throw new FramsticksException().msg("setting null to primitive value"); |
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133 | } |
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134 | s.invoke(object, value); |
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135 | } |
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136 | }; |
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137 | } |
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138 | } |
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139 | } |
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140 | } catch (ConstructionException e) { |
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141 | throw e.arg("java class", reflectedClass).arg("framsClass", framsClass); |
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142 | } |
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143 | |
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144 | List<Method> autoAppendMethods = new LinkedList<>(); |
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145 | |
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146 | Class<?> javaClass = reflectedClass; |
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147 | while (javaClass != null) { |
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148 | |
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149 | for (Method m : javaClass.getDeclaredMethods()) { |
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150 | AutoAppendAnnotation a = m.getAnnotation(AutoAppendAnnotation.class); |
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151 | if (a == null) { |
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152 | continue; |
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153 | } |
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154 | Class<?>[] args = m.getParameterTypes(); |
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155 | if (args.length != 1) { |
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156 | throw new ConstructionException().msg("invalid number of arguments in AutoAppend marked method").arg("method", m).arg("arguments", args.length); |
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157 | } |
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158 | autoAppendMethods.add(m); |
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159 | } |
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160 | |
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161 | javaClass = javaClass.getSuperclass(); |
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162 | } |
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163 | |
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164 | backend = new Backend(params, autoAppendMethods); |
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165 | synchronizedCache.put(id, backend); |
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166 | return backend; |
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167 | } |
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168 | |
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169 | } |
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170 | |
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171 | public ReflectionAccess(Class<?> reflectedClass) throws ConstructionException { |
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172 | this(reflectedClass, FramsClass.build().forClass(reflectedClass)); |
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173 | } |
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174 | |
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175 | public static boolean typeMatch(Class<?> a, Class<?> b) { |
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176 | assert !b.isPrimitive(); |
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177 | if (!a.isPrimitive()) { |
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178 | return a.equals(b); |
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179 | } |
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180 | |
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181 | if (a.equals(int.class)) { |
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182 | return b.equals(Integer.class); |
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183 | } |
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184 | if (a.equals(double.class)) { |
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185 | return b.equals(Double.class); |
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186 | } |
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187 | if (a.equals(boolean.class)) { |
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188 | return b.equals(Boolean.class); |
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189 | } |
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190 | assert false; |
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191 | return false; |
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192 | } |
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193 | |
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194 | public ReflectionAccess(Class<?> reflectedClass, FramsClass framsClass) throws ConstructionException { |
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195 | super(framsClass); |
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196 | this.reflectedClass = reflectedClass; |
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197 | this.backend = Backend.getOrCreateFor(reflectedClass, framsClass); |
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198 | // log.info("created ReflectionAccess " + this); |
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199 | } |
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200 | |
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201 | // private static String accessorName(boolean get, String id) { |
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202 | // return (get ? "get" : "set") + id.substring(0, 1).toUpperCase() + id.substring(1); |
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203 | // } |
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204 | |
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205 | @Override |
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206 | public <T> T get(ValueParam param, Class<T> type) { |
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207 | try { |
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208 | try { |
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209 | if (object == null) { |
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210 | throw new FramsticksException().msg("no object set"); |
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211 | } |
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212 | |
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213 | return backend.params.get(param).getter.get(object, type); |
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214 | } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { |
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215 | throw new FramsticksException().msg("failed to get").cause(e); |
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216 | } |
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217 | } catch (FramsticksException e) { |
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218 | throw e.arg("param", param).arg("type", type).arg("access", this); |
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219 | } |
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220 | } |
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221 | |
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222 | @Override |
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223 | protected <T> void internalSet(ValueParam param, T value) { |
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224 | setValue(param, value); |
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225 | } |
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226 | |
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227 | private <T> void setValue(ValueParam param, T value) { |
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228 | try { |
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229 | try { |
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230 | if (object == null) { |
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231 | throw new FramsticksException().msg("no object set"); |
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232 | } |
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233 | Backend.ReflectedSetter s = backend.params.get(param).setter; |
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234 | if (s == null) { |
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235 | throw new FramsticksException().msg("trying to set final"); |
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236 | } |
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237 | s.set(object, value); |
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238 | } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) { |
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239 | throw new FramsticksException().msg("failed to set").cause(e); |
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240 | } |
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241 | } catch (FramsticksException e) { |
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242 | throw e.arg("param", param).arg("value", value).arg("access", this); |
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243 | } |
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244 | } |
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245 | |
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246 | void resetErrors() { |
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247 | //TODO this replaces returnedObject.resetErrors(); |
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248 | } |
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249 | |
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250 | @Override |
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251 | public void clearValues() { |
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252 | if (object == null) { |
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253 | return; |
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254 | } |
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255 | |
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256 | resetErrors(); |
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257 | |
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258 | try { |
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259 | for (ValueParam p : filterInstanceof(framsClass.getParamEntries(), ValueParam.class)) { |
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260 | setValue(p, p.getDef(Object.class)); |
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261 | } |
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262 | } catch (IllegalArgumentException ex) { |
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263 | ex.printStackTrace(); |
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264 | } |
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265 | } |
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266 | |
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267 | /** |
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268 | * Sets the new object to operate on. |
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269 | * |
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270 | * @param object |
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271 | * new object to operate on |
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272 | */ |
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273 | @Override |
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274 | public ReflectionAccess select(Object object) { |
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275 | assert object == null || reflectedClass.isInstance(object); |
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276 | this.object = object; |
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277 | return this; |
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278 | } |
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279 | |
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280 | @Override |
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281 | public Object getSelected() { |
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282 | return object; |
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283 | } |
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284 | |
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285 | // TODO: find a better place for it |
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286 | public static String objectToString(Object object) { |
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287 | StringBuilder b = new StringBuilder(); |
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288 | for (Field f : object.getClass().getFields()) { |
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289 | b.append(f.getName()); |
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290 | b.append(":"); |
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291 | try { |
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292 | Object value = f.get(object); |
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293 | b.append((value != null) ? value.toString() : "<null>"); |
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294 | } catch (IllegalAccessException e) { |
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295 | e.printStackTrace(); |
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296 | } |
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297 | b.append("\n"); |
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298 | } |
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299 | return b.toString(); |
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300 | } |
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301 | |
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302 | @Override |
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303 | public ReflectionAccess cloneAccess() throws ConstructionException { |
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304 | return new ReflectionAccess(reflectedClass, framsClass); |
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305 | } |
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306 | |
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307 | @Override |
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308 | public Object createAccessee() { |
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309 | try { |
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310 | return reflectedClass.newInstance(); |
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311 | } catch (InstantiationException | IllegalAccessException e) { |
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312 | e.printStackTrace(); |
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313 | } |
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314 | log.fatal("failed to create reflected object of class " + reflectedClass.getCanonicalName() + " for frams type " + framsClass.getId()); |
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315 | return null; |
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316 | } |
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317 | |
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318 | @Override |
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319 | public String toString() { |
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320 | StringBuilder b = new StringBuilder(); |
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321 | b.append(framsClass); |
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322 | if (object != null) { |
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323 | b.append("(").append(object).append(")"); |
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324 | } |
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325 | return b.toString(); |
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326 | } |
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327 | |
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328 | @Override |
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329 | public boolean tryAutoAppend(Object value) { |
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330 | assert object != null; |
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331 | for (Method m : backend.autoAppendMethods) { |
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332 | if (m.getParameterTypes()[0].isAssignableFrom(value.getClass())) { |
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333 | try { |
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334 | m.invoke(object, value); |
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335 | return true; |
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336 | } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | FramsticksException e) { |
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337 | throw new FramsticksException().msg("failed to auto append").cause(e).arg("value", value).arg("into object", object).arg("with method", m); |
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338 | } |
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339 | } |
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340 | } |
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341 | return false; |
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342 | } |
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343 | } |
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344 | |
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