added support for SmoothBrick and changed steps to a TexturedMaterial

By: sunkid <sunkid@iminurnetz.com>

paper-api/src/main/java/org/bukkit/material/TexturedMaterial.java

@@ -0,0 +1,68 @@
+package org.bukkit.material;
+
+import java.util.List;
+
+import org.bukkit.Material;
+
+/**
+ * Represents textured materials like steps and smooth bricks
+ */
+public abstract class TexturedMaterial extends MaterialData {
+
+    public TexturedMaterial(Material m) {
+        super(m);
+    }
+
+    public TexturedMaterial(int type) {
+        super(type);
+    }
+
+    public TexturedMaterial(final int type, final byte data) {
+        super(type, data);
+    }
+
+    public TexturedMaterial(final Material type, final byte data) {
+        super(type, data);
+    }
+
+    /**
+     * Retrieve a list of possible textures. The first element of the list will be used as a default.
+     * 
+     * @return a list of possible textures for this block
+     */
+    public abstract List<Material> getTextures();
+
+    /**
+     * Gets the current Material this block is made of
+     * 
+     * @return Material of this block
+     */
+    public Material getMaterial() {
+        int n = (int) getData();
+        if (n > getTextures().size() - 1) {
+            n = 0;
+        }
+        
+        return getTextures().get(n);
+    }
+
+    /**
+     * Sets the material this block is made of
+     * 
+     * @param material
+     *            New material of this block
+     */
+    public void setMaterial(Material material) {
+        if (getTextures().contains(material)) {
+            setData((byte) getTextures().indexOf(material));
+        } else {
+            setData((byte) 0x0);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return getMaterial() + " " + super.toString();
+    }
+
+}