implement block get

worldedit-core/src/main/java/com/boydti/fawe/beta/implementation/blocks/CharBlocks.java

@@ -3,5 +3,93 @@ package com.boydti.fawe.beta.implementation.blocks;
 import com.boydti.fawe.beta.IBlocks;
 
 public class CharBlocks implements IBlocks {
-    protected char[][] blocks;
+    public final char[][] blocks;
+    public final Section[] sections;
+
+    public CharBlocks() {
+        blocks = new char[16][];
+        sections = new Section[16];
+        for (int i = 0; i < 16; i++) sections[i] = NULL;
+    }
+
+    @Override
+    public boolean trim(boolean aggressive) {
+        boolean result = true;
+        for (int i = 0; i < 16; i++) {
+            if (sections[i] == NULL) {
+                blocks[i] = null;
+            } else {
+                result = false;
+            }
+        }
+        return result;
+    }
+
+    @Override
+    public void reset() {
+        for (int i = 0; i < 16; i++) sections[i] = NULL;
+    }
+
+    protected char[] load(int layer) {
+        return new char[4096];
+    }
+
+    protected char[] load(int layer, char[] data) {
+        for (int i = 0; i < 4096; i++) data[i] = 0;
+        return data;
+    }
+
+    @Override
+    public boolean hasSection(int layer) {
+        return sections[layer] == FULL;
+    }
+
+    public char get(int x, int y, int z) {
+        int layer = y >> 4;
+        int index = ((y & 15) << 8) | (z << 4) | (x & 15);
+        return sections[layer].get(this, layer, index);
+    }
+
+    public char set(int x, int y, int z, char value) {
+        int layer = y >> 4;
+        int index = ((y & 15) << 8) | (z << 4) | (x & 15);
+        return sections[layer].set(this, layer, index, value);
+    }
+
+    /*
+        Section
+     */
+
+    public static abstract class Section {
+        public abstract char[] get(CharBlocks blocks, int layer);
+
+        public final char get(CharBlocks blocks, int layer, int index) {
+            return get(blocks, layer)[index];
+        }
+
+        public final char set(CharBlocks blocks, int layer, int index, char value) {
+            return get(blocks, layer)[index] = value;
+        }
+    }
+
+    public static final Section NULL = new Section() {
+        @Override
+        public final char[] get(CharBlocks blocks, int layer) {
+            blocks.sections[layer] = FULL;
+            char[] arr = blocks.blocks[layer];
+            if (arr == null) {
+                arr = blocks.blocks[layer] = blocks.load(layer);
+            } else {
+                blocks.blocks[layer] = blocks.load(layer, arr);
+            }
+            return arr;
+        }
+    };
+
+    public static final Section FULL = new Section() {
+        @Override
+        public final char[] get(CharBlocks blocks, int layer) {
+            return blocks.blocks[layer];
+        }
+    };
 }