[101] | 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.ArrayList; |
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| 7 | import java.util.Collections; |
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| 8 | import java.util.Comparator; |
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| 9 | import java.util.HashMap; |
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| 10 | import java.util.List; |
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| 11 | import java.util.Map; |
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| 12 | |
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| 13 | import javax.annotation.concurrent.Immutable; |
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| 14 | |
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| 15 | import com.framsticks.params.annotations.AutoAppendAnnotation; |
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| 16 | import com.framsticks.params.types.EventParam; |
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| 17 | import com.framsticks.params.types.ProcedureParam; |
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| 18 | import com.framsticks.util.FramsticksException; |
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| 19 | import com.framsticks.util.lang.Pair; |
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| 20 | |
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| 21 | |
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| 22 | import org.apache.logging.log4j.Logger; |
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| 23 | import org.apache.logging.log4j.LogManager; |
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| 24 | |
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| 25 | import static com.framsticks.util.lang.Containers.*; |
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| 26 | |
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| 27 | @Immutable |
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| 28 | public class ReflectionAccessBackend { |
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| 29 | |
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| 30 | private final static Logger log = LogManager.getLogger(ReflectionAccessBackend.class.getName()); |
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| 31 | |
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| 32 | protected static final Map<Pair<Class<?>, FramsClass>, ReflectionAccessBackend> synchronizedCache = Collections.synchronizedMap(new HashMap<Pair<Class<?>, FramsClass>, ReflectionAccessBackend>()); |
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| 33 | |
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| 34 | |
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| 35 | public interface ReflectedGetter { |
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| 36 | public <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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| 37 | } |
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| 38 | |
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| 39 | public interface ReflectedSetter { |
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| 40 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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| 41 | } |
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| 42 | |
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| 43 | public interface ReflectedCaller { |
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| 44 | public Object call(Object object, Object[] arguments) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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| 45 | } |
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| 46 | |
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| 47 | public interface ReflectedAdder{ |
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| 48 | public void reg(Object object, EventListener<?> listener) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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| 49 | } |
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| 50 | |
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| 51 | public interface ReflectedRemover{ |
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| 52 | public void regRemove(Object object, EventListener<?> listener) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException; |
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| 53 | } |
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| 54 | |
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| 55 | protected final Map<String, ReflectedSetter> setters = new HashMap<>(); |
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| 56 | protected final Map<String, ReflectedGetter> getters = new HashMap<>(); |
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| 57 | protected final Map<String, ReflectedCaller> callers = new HashMap<>(); |
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| 58 | protected final Map<String, ReflectedAdder> adders = new HashMap<>(); |
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| 59 | protected final Map<String, ReflectedRemover> removers = new HashMap<>(); |
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| 60 | |
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| 61 | protected final List<Method> autoAppendMethods = new ArrayList<>(); |
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| 62 | |
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| 63 | /** |
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| 64 | * @param params |
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| 65 | */ |
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| 66 | public ReflectionAccessBackend() { |
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| 67 | } |
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| 68 | |
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| 69 | public static ReflectionAccessBackend getOrCreateFor(Class<?> reflectedClass, FramsClass framsClass) { |
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| 70 | |
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| 71 | Pair<Class<?>, FramsClass> id = new Pair<Class<?>, FramsClass>(reflectedClass, framsClass); |
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| 72 | ReflectionAccessBackend backend = synchronizedCache.get(id); |
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| 73 | if (backend != null) { |
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| 74 | return backend; |
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| 75 | } |
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| 76 | |
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| 77 | log.debug("constructing backend for {}", id); |
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| 78 | backend = new ReflectionAccessBackend(); |
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| 79 | |
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| 80 | Map<String, ParamCandidate> candidates = ParamCandidate.getAllCandidates(reflectedClass).getCandidates(); |
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| 81 | |
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| 82 | try { |
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[105] | 83 | for (final ProcedureParam pp : filterInstanceof(framsClass.getParams(), ProcedureParam.class)) { |
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[101] | 84 | if (!candidates.containsKey(pp.getId())) { |
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| 85 | log.trace("java class does implement method {}", pp); |
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| 86 | continue; |
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| 87 | } |
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| 88 | ParamCandidate pc = candidates.get(pp.getId()); |
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| 89 | final Method method = pc.getCaller(); |
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| 90 | |
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| 91 | backend.callers.put(pp.getId(), new ReflectedCaller() { |
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| 92 | |
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| 93 | @Override |
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| 94 | public Object call(Object object, Object[] arguments) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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| 95 | return method.invoke(object, arguments); |
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| 96 | } |
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| 97 | }); |
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| 98 | |
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| 99 | } |
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| 100 | |
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[105] | 101 | for (final EventParam ep : filterInstanceof(framsClass.getParams(), EventParam.class)) { |
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[101] | 102 | if (!candidates.containsKey(ep.getId())) { |
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| 103 | log.trace("java class does not implement the event param {}", ep); |
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| 104 | continue; |
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| 105 | } |
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| 106 | ParamCandidate ec = candidates.get(ep.getId()); |
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| 107 | final Method adder = ec.getAdder(); |
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| 108 | final Method remover = ec.getRemover(); |
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| 109 | |
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| 110 | backend.adders.put(ep.getId(), new ReflectedAdder() { |
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| 111 | |
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| 112 | @Override |
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| 113 | public void reg(Object object, EventListener<?> listener) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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| 114 | adder.invoke(object, listener); |
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| 115 | } |
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| 116 | }); |
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| 117 | |
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| 118 | backend.removers.put(ep.getId(), new ReflectedRemover() { |
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| 119 | |
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| 120 | @Override |
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| 121 | public void regRemove(Object object, EventListener<?> listener) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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| 122 | remover.invoke(object, listener); |
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| 123 | } |
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| 124 | }); |
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| 125 | } |
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| 126 | |
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[105] | 127 | for (final ValueParam vp : filterInstanceof(framsClass.getParams(), ValueParam.class)) { |
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[101] | 128 | if (!candidates.containsKey(vp.getId())) { |
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| 129 | throw new ConstructionException().msg("missing candidate for param").arg("param", vp); |
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| 130 | } |
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| 131 | ParamCandidate pc = candidates.get(vp.getId()); |
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| 132 | if (pc.isReadOnly() && !vp.hasFlag(ParamFlags.READONLY)) { |
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| 133 | throw new ConstructionException().msg("readonly state conflict").arg("param", vp); |
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| 134 | } |
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| 135 | if (!typeMatch(pc.getRawType(), vp.getStorageType())) { |
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| 136 | throw new ConstructionException().msg("types mismatch for param").arg("param", vp).arg("candidate", pc.getType()).arg("storage", vp.getStorageType()); |
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| 137 | } |
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| 138 | |
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| 139 | final boolean primitive = pc.isPrimitive(); |
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| 140 | if (pc.getField() != null) { |
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| 141 | final Field f = pc.getField(); |
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| 142 | backend.getters.put(vp.getId(), new ReflectedGetter() { |
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| 143 | @Override |
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| 144 | public <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException { |
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| 145 | return type.cast(f.get(object)); |
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| 146 | } |
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| 147 | }); |
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| 148 | if (!pc.isFinal()) { |
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| 149 | backend.setters.put(vp.getId(), new ReflectedSetter() { |
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| 150 | @Override |
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| 151 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException { |
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| 152 | if (value == null && primitive) { |
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| 153 | throw new FramsticksException().msg("setting null to primitive value"); |
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| 154 | } |
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| 155 | f.set(object, value); |
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| 156 | } |
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| 157 | }); |
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| 158 | } |
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| 159 | } else { |
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| 160 | final Method g = pc.getGetter(); |
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| 161 | |
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| 162 | backend.getters.put(vp.getId(), new ReflectedGetter() { |
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| 163 | @Override |
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| 164 | public <T> T get(Object object, Class<T> type) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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| 165 | return type.cast(g.invoke(object)); |
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| 166 | } |
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| 167 | }); |
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| 168 | |
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| 169 | if (!pc.isFinal()) { |
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| 170 | final Method s = pc.getSetter(); |
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| 171 | backend.setters.put(vp.getId(), new ReflectedSetter() { |
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| 172 | @Override |
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| 173 | public <T> void set(Object object, T value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
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| 174 | if (value == null && primitive) { |
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| 175 | throw new FramsticksException().msg("setting null to primitive value"); |
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| 176 | } |
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| 177 | s.invoke(object, value); |
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| 178 | } |
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| 179 | }); |
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| 180 | } |
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| 181 | } |
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| 182 | } |
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| 183 | } catch (ConstructionException e) { |
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| 184 | throw e.arg("java class", reflectedClass).arg("framsClass", framsClass); |
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| 185 | } |
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| 186 | |
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| 187 | Class<?> javaClass = reflectedClass; |
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| 188 | while (javaClass != null) { |
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| 189 | |
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| 190 | for (Method m : javaClass.getDeclaredMethods()) { |
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| 191 | AutoAppendAnnotation a = m.getAnnotation(AutoAppendAnnotation.class); |
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| 192 | if (a == null) { |
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| 193 | continue; |
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| 194 | } |
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| 195 | Class<?>[] args = m.getParameterTypes(); |
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| 196 | if (args.length != 1) { |
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| 197 | throw new ConstructionException().msg("invalid number of arguments in AutoAppend marked method").arg("method", m).arg("arguments", args.length); |
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| 198 | } |
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| 199 | backend.autoAppendMethods.add(m); |
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| 200 | } |
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| 201 | |
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| 202 | javaClass = javaClass.getSuperclass(); |
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| 203 | } |
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| 204 | |
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| 205 | Collections.sort(backend.autoAppendMethods, new Comparator<Method>() { |
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| 206 | |
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| 207 | @Override |
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| 208 | public int compare(Method m0, Method m1) { |
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| 209 | Class<?> arg0 = m0.getParameterTypes()[0]; |
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| 210 | Class<?> arg1 = m1.getParameterTypes()[0]; |
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| 211 | if (arg0.isAssignableFrom(arg1)) { |
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| 212 | return 1; |
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| 213 | } |
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| 214 | if (arg1.isAssignableFrom(arg0)) { |
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| 215 | return -1; |
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| 216 | } |
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| 217 | return 0; |
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| 218 | } |
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| 219 | }); |
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| 220 | |
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| 221 | synchronizedCache.put(id, backend); |
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| 222 | return backend; |
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| 223 | } |
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| 224 | |
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| 225 | public static boolean typeMatch(Class<?> a, Class<?> b) { |
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| 226 | if (b.isPrimitive()) { |
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| 227 | throw new FramsticksException().msg("failed to match type, right argument is primitive").arg("left", a).arg("right", b); |
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| 228 | } |
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| 229 | if (!a.isPrimitive()) { |
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[105] | 230 | return b.isAssignableFrom(a);//equals(b); |
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[101] | 231 | } |
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| 232 | |
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| 233 | if (a.equals(int.class)) { |
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| 234 | return b.equals(Integer.class); |
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| 235 | } |
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| 236 | if (a.equals(double.class)) { |
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| 237 | return b.equals(Double.class); |
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| 238 | } |
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| 239 | if (a.equals(boolean.class)) { |
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| 240 | return b.equals(Boolean.class); |
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| 241 | } |
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| 242 | throw new FramsticksException().msg("failed to match types").arg("left", a).arg("right", b); |
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| 243 | } |
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| 244 | |
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| 245 | } |
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