X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.scl.compiler%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fcompiler%2Finternal%2Fcodegen%2Futils%2FValueFromMethod.java;fp=bundles%2Forg.simantics.scl.compiler%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fcompiler%2Finternal%2Fcodegen%2Futils%2FValueFromMethod.java;h=5a736a38075b4e635b3b6914e5c8a8e5180a0947;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/utils/ValueFromMethod.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/utils/ValueFromMethod.java
new file mode 100644
index 000000000..5a736a380
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/codegen/utils/ValueFromMethod.java
@@ -0,0 +1,85 @@
+package org.simantics.scl.compiler.internal.codegen.utils;
+
+import java.lang.reflect.Method;
+
+import org.simantics.scl.runtime.function.FunctionImpl1;
+import org.simantics.scl.runtime.function.FunctionImpl2;
+import org.simantics.scl.runtime.function.FunctionImpl3;
+import org.simantics.scl.runtime.function.FunctionImpl4;
+import org.simantics.scl.runtime.function.FunctionImplN;
+import org.simantics.scl.runtime.tuple.Tuple0;
+
+public class ValueFromMethod {
+
+    public static Object getValueFromStaticMethod(final Method method) throws ReflectiveOperationException {
+        int arity = method.getParameterTypes().length;
+        final boolean returnsVoid = method.getReturnType().equals(void.class);
+        switch(arity) {
+        case 0: {
+            Object ret = method.invoke(null);
+            return returnsVoid ? Tuple0.INSTANCE : ret;
+        }
+        case 1:
+            return new FunctionImpl1<Object,Object>() {
+                @Override
+                public Object apply(Object p0) {
+                    try {
+                        Object ret = method.invoke(null, p0);
+                        return returnsVoid ? Tuple0.INSTANCE : ret;
+                    } catch (ReflectiveOperationException e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+            };
+        case 2:
+            return new FunctionImpl2<Object,Object,Object>() {
+                @Override
+                public Object apply(Object p0, Object p1) {
+                    try {
+                        Object ret = method.invoke(null, p0, p1);
+                        return returnsVoid ? Tuple0.INSTANCE : ret;
+                    } catch (ReflectiveOperationException e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+            };
+        case 3:
+            return new FunctionImpl3<Object,Object,Object,Object>() {
+                @Override
+                public Object apply(Object p0, Object p1, Object p2) {
+                    try {
+                        Object ret = method.invoke(null, p0, p1, p2);
+                        return returnsVoid ? Tuple0.INSTANCE : ret;
+                    } catch (ReflectiveOperationException e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+            };
+        case 4:
+            return new FunctionImpl4<Object,Object,Object,Object,Object>() {
+                @Override
+                public Object apply(Object p0, Object p1, Object p2, Object p3) {
+                    try {
+                        Object ret = method.invoke(null, p0, p1, p2, p3);
+                        return returnsVoid ? Tuple0.INSTANCE : ret;
+                    } catch (ReflectiveOperationException e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+            };
+        default:
+            return new FunctionImplN(arity) {
+                @Override
+                public Object doApply(Object... ps) {
+                    try {
+                        Object ret =  method.invoke(null, ps);
+                        return returnsVoid ? Tuple0.INSTANCE : ret;
+                    } catch (ReflectiveOperationException e) {
+                        throw new RuntimeException(e);
+                    }
+                }
+            };
+        }
+    }
+    
+}