added refs to this and super

src/main/java/nl/sander/beejava/Compiler.java

@@ -3,6 +3,7 @@ package nl.sander.beejava;
 import nl.sander.beejava.api.BeeClass;
 import nl.sander.beejava.constantpool.ConstantPool;
 import nl.sander.beejava.constantpool.entry.NodeConstant;
+import nl.sander.beejava.flags.ClassAccessFlag;
 import nl.sander.beejava.util.ByteBuf;
 
 import java.util.Set;
@@ -33,9 +34,14 @@ public class Compiler {
 
         buf.addU16(constantPool.getLength());
         buf.addU8(constantPool.getBytes());
+        buf.addU16(ClassAccessFlag.getSum(beeClass.getAccessFlags()));
+        buf.addU16(constantTreeCreator.getThisClass().getIndex());
+        buf.addU16(constantTreeCreator.getSuperClass().getIndex());
 
-
-
+        int x = 1;
+        for (NodeConstant e : constantPool) {
+            System.out.println((x++) + ":" + e);
+        }
         printBytes(buf);
 
         return buf.toBytes();

src/main/java/nl/sander/beejava/ConstantPoolCreator.java

@@ -15,7 +15,6 @@ public class ConstantPoolCreator {
 
     public ConstantPool createConstantPool(Set<NodeConstant> constantTree) {
         constantPool = new ConstantPool();
-//        constantPool.add(null); // dummy element to align it's index with the indexes in the elements themselves
         index = 0;
         updateToplevelElements(constantTree);
         return constantPool;

src/main/java/nl/sander/beejava/ConstantTreeCreator.java

@@ -10,7 +10,7 @@ import java.util.Set;
 
 /**
  * Builds a set of a tree of constant pool entries that refer to each other.
- *
+ * <p>
  * A client must supply a {@link BeeClass} containing a set of {@link CodeLine}s that is assumed to be correct.
  * It doesn't check if a valid state is reached.
  */
@@ -20,6 +20,9 @@ import java.util.Set;
 public class ConstantTreeCreator {
     private final Set<NodeConstant> constantTree = new LinkedHashSet<>();
     private BeeClass beeClass;
+    private ClassEntry thisClass;
+    private ClassEntry superClass;
+
 
     /**
      * Creates a Set of nested entries that make up a single reference. For instance a class reference whose name is a utf8 reference.
@@ -34,10 +37,30 @@ public class ConstantTreeCreator {
         beeClass.getConstructors().forEach(this::updateConstantTree);
         // TODO update constantTree for fields ?
         // TODO update constantTree for methods
-        constantTree.add(new ClassEntry(new Utf8Entry(internalName(beeClass.getName()))));
+
+        constantTree.add(getThisClassRef(beeClass));
         return constantTree;
     }
 
+    /*
+     * might be null if no methods refer to _this_
+     */
+    private ClassEntry getThisClassRef(BeeClass beeClass) {
+        if (thisClass == null) {
+            thisClass = new ClassEntry(new Utf8Entry(internalName(beeClass.getName())));
+        }
+        return thisClass;
+    }
+
+
+    public ClassEntry getThisClass() {
+        return thisClass;
+    }
+
+    public ClassEntry getSuperClass() {
+        return superClass;
+    }
+
     private void updateConstantTree(ContainsCode codeContainer) {
         codeContainer.getCode().forEach(this::updateConstantTree);
     }
@@ -46,7 +69,7 @@ public class ConstantTreeCreator {
      * scan code line for items that need adding to the constant pool
      */
     private void updateConstantTree(CodeLine codeline) {
-        if (codeline.hasMethod()){
+        if (codeline.hasMethod()) {
             addMethod(codeline);
         }
 
@@ -56,11 +79,11 @@ public class ConstantTreeCreator {
     }
 
     private void addMethod(CodeLine codeline) {
-        constantTree.add(new MethodRefEntry(createClassName(codeline), createMethodNameAndType(codeline)));
+        constantTree.add(new MethodRefEntry(getOrCreateClassEntry(codeline), createMethodNameAndType(codeline)));
     }
 
     private void addField(CodeLine codeline) {
-        constantTree.add(new FieldRefEntry(createClassName(codeline), createFieldNameAndType(codeline)));
+        constantTree.add(new FieldRefEntry(getOrCreateClassEntry(codeline), createFieldNameAndType(codeline)));
     }
 
     private NameAndTypeEntry createMethodNameAndType(CodeLine codeline) {
@@ -71,17 +94,24 @@ public class ConstantTreeCreator {
         return new NameAndTypeEntry(new Utf8Entry(codeline.getField().getName()), new Utf8Entry(TypeMapper.map(codeline.getField().getType())));
     }
 
-    private ClassEntry createClassName(CodeLine codeline) {
-        return new ClassEntry(new Utf8Entry(internalName(getNameOfClass(codeline))));
+    private ClassEntry getOrCreateClassEntry(CodeLine codeline) {
+        if (codeline.getRef() == Ref.SUPER) {
+            if (superClass == null) {
+                superClass = createClassEntry(beeClass.getSuperClass().getName());
+            }
+            return superClass;
+        } else if (codeline.getRef() == Ref.THIS) {
+            if (thisClass == null) {
+                thisClass = createClassEntry(beeClass.getName());
+            }
+            return thisClass;
+        }
+        //TODO other cases
+        throw new RuntimeException("shouldn't be here");
     }
 
-    private String getNameOfClass(CodeLine codeline) {
-        if (codeline.getRef() == Ref.SUPER) {
-            return beeClass.getSuperClass().getName();
-        } else if (codeline.getRef() == Ref.THIS) {
-            return beeClass.getName();
-        }
-        throw new RuntimeException("shouldn't be here");
+    private ClassEntry createClassEntry(String name) {
+        return new ClassEntry(new Utf8Entry(internalName(name)));
     }
 
     private String internalName(String name) {

src/main/java/nl/sander/beejava/api/CodeLine.java

@@ -90,6 +90,10 @@ public class CodeLine {
         return ref;
     }
 
+    public boolean hasRef() {
+        return ref != null;
+    }
+
     public boolean hasField() {
         return field != null;
     }

src/main/java/nl/sander/beejava/constantpool/ConstantPool.java

@@ -6,25 +6,20 @@ import nl.sander.beejava.util.ByteBuf;
 import java.util.ArrayList;
 import java.util.List;
 
-public class ConstantPool {
-    private final List<NodeConstant> entries = new ArrayList<>();
+public class ConstantPool extends ArrayList<NodeConstant>{
 
     public int getIndex(NodeConstant entry) {
-        for (int i = 0; i < entries.size(); i++) {
-            if (entries.get(i) == entry) {
+        for (int i = 0; i < size(); i++) {
+            if (get(i) == entry) {
                 return i + 1;
             }
         }
         return -1;
     }
 
-    public void add(NodeConstant entry) {
-        entries.add(entry);
-    }
-
     public byte[] getBytes() {
         ByteBuf bytes = new ByteBuf();
-        entries.forEach(entry -> bytes.addU8(entry.getBytes()));
+        forEach(entry -> bytes.addU8(entry.getBytes()));
         return bytes.toBytes();
     }
 
@@ -32,6 +27,6 @@ public class ConstantPool {
      * get the length +1
      */
     public int getLength() {
-        return entries.size() + 1;
+        return size() + 1;
     }
 }

src/main/java/nl/sander/beejava/flags/ClassAccessFlag.java

@@ -1,6 +1,6 @@
 package nl.sander.beejava.flags;
 
-import nl.sander.beejava.flags.AccessFlag;
+import java.util.Collection;
 
 public enum ClassAccessFlag implements AccessFlag {
     PUBLIC(0x0001), // Declared public; may be accessed from outside its package.
@@ -13,10 +13,15 @@ public enum ClassAccessFlag implements AccessFlag {
     ENUM(0x4000), // Declared as an enum type.
     MODULE(0x8000); // Is a module, not a class or interface.
 
+
     private final int bytecode;
 
     ClassAccessFlag(int bytecode) {
-        this.bytecode=bytecode;
+        this.bytecode = bytecode;
+    }
+
+    public static int getSum(Collection<ClassAccessFlag> flags) {
+        return flags.stream().mapToInt(ClassAccessFlag::getBytecode).reduce(0, (result, value) -> result | value);
     }
 
     @Override

src/test/java/nl/sander/beejava/flags/ClassAccessFlagTest.java

@@ -0,0 +1,24 @@
+package nl.sander.beejava.flags;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ClassAccessFlagTest {
+    @Test
+    public void mustOr1Value() {
+        assertEquals(1, ClassAccessFlag.getSum(Collections.singletonList(ClassAccessFlag.PUBLIC)));
+    }
+
+    @Test
+    public void mustOr2Values() {
+        assertEquals(17, ClassAccessFlag.getSum(Arrays.asList(ClassAccessFlag.PUBLIC, ClassAccessFlag.FINAL)));
+    }
+
+
+
+}