added MaterialData classes and associated Enums for COAL, CROPS, LOG, LEAVES, STEP, and DOUBLE_STEP

By: sunkid <sunkid@iminurnetz.com>

paper-api/src/main/java/org/bukkit/CropState.java

@@ -0,0 +1,77 @@
+package org.bukkit;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Represents the different growth states of crops
+ * @author sunkid
+ */
+public enum CropState {
+    /**
+     * State when first seeded
+     */
+    SEEDED((byte) 0x0),
+    /**
+     * First growth stage
+     */
+    GERMINATED((byte) 0x1),
+    /**
+     * Second growth stage
+     */
+    VERY_SMALL((byte) 0x2),
+    /**
+     * Third growth stage
+     */
+    SMALL((byte) 0x3),
+    /**
+     * Fourth growth stage
+     */
+    MEDIUM((byte) 0x4),
+    /**
+     * Fifth growth stage
+     */
+    TALL((byte) 0x5),
+    /**
+     * Almost ripe stage
+     */
+    VERY_TALL((byte) 0x6),
+    /**
+     * Ripe stage
+     */
+    RIPE((byte) 0x7);
+
+    private final byte data;
+    private final static Map<Byte, CropState> states = new HashMap<Byte, CropState>();
+
+    private CropState(final byte data) {
+        this.data = data;
+    }
+
+    /**
+     * Gets the associated data value representing this growth state
+     *
+     * @return A byte containing the data value of this growth state
+     */
+    public byte getData() {
+        return data;
+    }
+
+    /**
+     * Gets the CropState with the given data value
+     *
+     * @param data
+     *            Data value to fetch
+     * @return The {@link CropState} representing the given value, or null if
+     *         it doesn't exist
+     */
+    public static CropState getByData(final byte data) {
+        return states.get(data);
+    }
+
+    static {
+        for (CropState s : CropState.values()) {
+            states.put(s.getData(), s);
+        }
+    }
+}