added getter support in precidates

src/main/java/jef/asm/FilterMethodVisitor.java

@@ -18,11 +18,14 @@ import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.Type;
 
+import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.Stack;
 import java.util.function.Consumer;
@@ -80,7 +83,7 @@ class FilterMethodVisitor extends MethodVisitor {
     @Override
     public void visitMethodInsn(int opcode, String owner, String name, String descriptor, boolean isInterface) {
         System.out.println("method insn: " + ops.getOrDefault(opcode, "" + opcode) + ", " + owner + ", " + name + ", " + descriptor);
-        if (opcode == Opcodes.INVOKESTATIC) {
+        if (opcode == Opcodes.INVOKESTATIC && name.equals("valueOf")) {
             //ignore boxed primitive types
             var boxedPrimitiveClasses = Set.of("java/lang/Boolean", "java/lang/Integer", "java/lang/Long", "java/lang/Float", "java/lang/Double");
             if (boxedPrimitiveClasses.contains(owner)) {
@@ -89,18 +92,34 @@ class FilterMethodVisitor extends MethodVisitor {
                 //do something
                 throw new RuntimeException("method insn: unsupported opcode " + ops.getOrDefault(opcode, "" + opcode));
             }
-        } else if (opcode == Opcodes.INVOKEINTERFACE) {
+        } else if (opcode == Opcodes.INVOKEINTERFACE || opcode == Opcodes.INVOKEVIRTUAL) {
             try {
                 if (name.equals("contains")
                         && owner.startsWith("java/util/")
                         && Collection.class.isAssignableFrom(Class.forName(owner.replace("/", ".")))) {
                     var element = varStack.pop();
                     var collection = varStack.pop();
-//                        System.out.println("element: " + element);
-//                        System.out.println("collection: " + collection);
                     varStack.push(new BinaryExpression(element, collection, BinaryExpression.Operator.IN));
+                } else if (name.startsWith("get") && name.length() > 3 && descriptor.startsWith("()")) { //hacky getter support, TODO replace this with proper getter eval later
+                    var field = findField(owner, name);
+                    if (field.isPresent()) {
+                        var v = varStack.pop();
+                        if (v instanceof ParameterExpression p) {
+                            if (p.isInput()) {
+                                varStack.push(new FieldExpression(field.get().getName(), descriptor.substring(2)));
+                            } else {
+                                throw new RuntimeException("method insn: getter support only to predicate parameter");
                             }
-            } catch (ClassNotFoundException e) {
+                        } else {
+                            throw new RuntimeException("method insn: getter support expected ParameterExpression but found" + v.getClass().getSimpleName());
+                        }
+                    } else {
+                        throw new RuntimeException("method insn: could not find field for getter " + name + " in " + owner);
+                    }
+                } else {
+                    throw new RuntimeException("method insn: unsupported function " + name + " in " + owner);
+                }
+            } catch (Exception e) {
                 throw new RuntimeException("method insn: ", e);
             }
         } else {
@@ -447,4 +466,19 @@ class FilterMethodVisitor extends MethodVisitor {
             System.out.println("-------------------> " + new WhereExpression(new SelectExpression(List.of("*"), new TableExpression("dummy"), ""), varStack.peek()));
         }
     }
+
+    private static Optional<Field> findField(String owner, String name) throws Exception {
+        var cls = Class.forName(owner.replace("/", "."));
+        String fieldname = name.substring(3, 4).toLowerCase(Locale.ROOT) + name.substring(4);
+        var field = cls.getDeclaredField(fieldname);
+        if (field != null) {
+            return Optional.of(field);
+        }
+        for (Field declaredField : cls.getDeclaredFields()) {
+            if (declaredField.getName().equalsIgnoreCase(fieldname)) {
+                return Optional.of(declaredField);
+            }
+        }
+        return Optional.empty();
+    }
 }

src/test/java/jef/operations/FilterOpTest.java

@@ -1,6 +1,7 @@
 package jef.operations;
 
 import jef.DBSet;
+import lombok.Getter;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
@@ -207,10 +208,15 @@ public class FilterOpTest {
     }
 
     @Test
-    public void test() {
-
+    public void testMemberViaGetter() {
+        String act;
+        act = new DBSet<TestClass>("table1")
+                .filter(e -> e.getI() == 1337)
+                .toString();
+        Assertions.assertEquals("SELECT * FROM (SELECT * FROM `table1`) a WHERE a.i = 1337", act);
     }
 
+    @Getter
     public static class TestClass implements Serializable {
         public int i = 1;
         public Object o = new Object();