gerrit.simantics Code Review - simantics/platform.git/blob

   1 package org.simantics.scl.compiler.internal.codegen.utils;
   2
   3 import java.lang.reflect.Method;
   4
   5 import org.simantics.scl.runtime.function.FunctionImpl1;
   6 import org.simantics.scl.runtime.function.FunctionImpl2;
   7 import org.simantics.scl.runtime.function.FunctionImpl3;
   8 import org.simantics.scl.runtime.function.FunctionImpl4;
   9 import org.simantics.scl.runtime.function.FunctionImplN;
  10 import org.simantics.scl.runtime.tuple.Tuple0;
  11
  12 public class ValueFromMethod {
  13
  14     public static Object getValueFromStaticMethod(final Method method) throws ReflectiveOperationException {
  15         int arity = method.getParameterTypes().length;
  16         final boolean returnsVoid = method.getReturnType().equals(void.class);
  17         switch(arity) {
  18         case 0: {
  19             Object ret = method.invoke(null);
  20             return returnsVoid ? Tuple0.INSTANCE : ret;
  21         }
  22         case 1:
  23             return new FunctionImpl1<Object,Object>() {
  24                 @Override
  25                 public Object apply(Object p0) {
  26                     try {
  27                         Object ret = method.invoke(null, p0);
  28                         return returnsVoid ? Tuple0.INSTANCE : ret;
  29                     } catch (ReflectiveOperationException e) {
  30                         throw new RuntimeException(e);
  31                     }
  32                 }
  33             };
  34         case 2:
  35             return new FunctionImpl2<Object,Object,Object>() {
  36                 @Override
  37                 public Object apply(Object p0, Object p1) {
  38                     try {
  39                         Object ret = method.invoke(null, p0, p1);
  40                         return returnsVoid ? Tuple0.INSTANCE : ret;
  41                     } catch (ReflectiveOperationException e) {
  42                         throw new RuntimeException(e);
  43                     }
  44                 }
  45             };
  46         case 3:
  47             return new FunctionImpl3<Object,Object,Object,Object>() {
  48                 @Override
  49                 public Object apply(Object p0, Object p1, Object p2) {
  50                     try {
  51                         Object ret = method.invoke(null, p0, p1, p2);
  52                         return returnsVoid ? Tuple0.INSTANCE : ret;
  53                     } catch (ReflectiveOperationException e) {
  54                         throw new RuntimeException(e);
  55                     }
  56                 }
  57             };
  58         case 4:
  59             return new FunctionImpl4<Object,Object,Object,Object,Object>() {
  60                 @Override
  61                 public Object apply(Object p0, Object p1, Object p2, Object p3) {
  62                     try {
  63                         Object ret = method.invoke(null, p0, p1, p2, p3);
  64                         return returnsVoid ? Tuple0.INSTANCE : ret;
  65                     } catch (ReflectiveOperationException e) {
  66                         throw new RuntimeException(e);
  67                     }
  68                 }
  69             };
  70         default:
  71             return new FunctionImplN(arity) {
  72                 @Override
  73                 public Object doApply(Object... ps) {
  74                     try {
  75                         Object ret =  method.invoke(null, ps);
  76                         return returnsVoid ? Tuple0.INSTANCE : ret;
  77                     } catch (ReflectiveOperationException e) {
  78                         throw new RuntimeException(e);
  79                     }
  80                 }
  81             };
  82         }
  83     }
  84
  85 }