working on lists

Makefile

@@ -2,9 +2,11 @@ CXX=g++ -std=c++11
 
 CAPNP_SOURCES=\
 	src/capnp/ListPointer.java\
+	src/capnp/ListReader.java\
 	src/capnp/PointerReader.java\
 	src/capnp/SegmentReader.java\
 	src/capnp/StructReader.java\
+	src/capnp/StructList.java\
 	src/capnp/Text.java\
 	src/capnp/WireHelpers.java\
 	src/capnp/WirePointer.java\

src/capnp/ListReader.java

@@ -0,0 +1,24 @@
+package capnp;
+
+public class ListReader {
+    SegmentReader segment;
+    int ptr; // byte offset to front of list
+    int elementCount;
+    int step;
+    int structDataSize; // in bits
+    short structPointerCount;
+    int nestingLimit;
+
+
+    public StructReader getStructElement(int index) {
+        // TODO check nesting limit
+
+        int indexBit = index * this.step;
+
+        int structData = this.ptr + (indexBit / 8);
+        int structPointers = structData + (this.structDataSize / 8);
+
+        return new StructReader(this.segment, structData, structPointers, this.structDataSize,
+                                this.structPointerCount, (byte)(indexBit % 8), this.nestingLimit - 1);
+    }
+}

src/capnp/StructList.java

@@ -0,0 +1,8 @@
+package capnp;
+
+
+public class StructList {
+    public static class Reader<T> {
+        public ListReader reader;
+    }
+}

src/capnp/StructReader.java

@@ -11,6 +11,18 @@ public class StructReader {
     public int nestingLimit;
 
 
+    public StructReader(SegmentReader segment, int data,
+                        int pointers, int dataSize, short pointerCount,
+                        byte bit0Offset, int nestingLimit) {
+        this.segment = segment;
+        this.data = data;
+        this.pointers = pointers;
+        this.dataSize = dataSize;
+        this.pointerCount = pointerCount;
+        this.bit0Offset = bit0Offset;
+        this.nestingLimit = nestingLimit;
+    }
+
     public boolean getBoolField(int offset) {
         // XXX should use unsigned operations
         if (offset < this.dataSize) {