initial commit

java/src/game/pattern/BlockStateHelper.java

@@ -0,0 +1,61 @@
+package game.pattern;
+
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.function.Predicate;
+
+import game.block.Block;
+import game.collect.Maps;
+import game.properties.IProperty;
+import game.world.State;
+
+public class BlockStateHelper implements Predicate<State>
+{
+    private final Block block;
+    private final Map<IProperty, Predicate> predicates = Maps.<IProperty, Predicate>newHashMap();
+
+    private BlockStateHelper(Block blockStateIn)
+    {
+        this.block = blockStateIn;
+    }
+
+    public static BlockStateHelper forBlock(Block blockIn)
+    {
+        return new BlockStateHelper(blockIn);
+    }
+
+    public boolean test(State p_apply_1_)
+    {
+        if (p_apply_1_ != null && p_apply_1_.getBlock().equals(this.block))
+        {
+            for (Entry<IProperty, Predicate> entry : this.predicates.entrySet())
+            {
+                Object object = p_apply_1_.getValue((IProperty)entry.getKey());
+
+                if (!((Predicate)entry.getValue()).test(object))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+        else
+        {
+            return false;
+        }
+    }
+
+    public <V extends Comparable<V>> BlockStateHelper where(IProperty<V> property, Predicate <? extends V > is)
+    {
+        if (!this.block.getPropertyMap().contains(property))
+        {
+            throw new IllegalArgumentException(this.block + " cannot support property " + property);
+        }
+        else
+        {
+            this.predicates.put(property, is);
+            return this;
+        }
+    }
+}