0022-Add-CanDestroy-and-CanPlaceOn-to-ItemMeta.patch

From 130579aef8ad42d12744d5907d0c08157e0a41be Mon Sep 17 00:00:00 2001
From: Jedediah Smith <jedediah@silencegreys.com>
Date: Fri, 22 May 2015 00:45:13 -0400
Subject: [PATCH] Add CanDestroy and CanPlaceOn to ItemMeta


diff --git a/src/main/java/org/bukkit/inventory/meta/ItemMeta.java b/src/main/java/org/bukkit/inventory/meta/ItemMeta.java
index d8cc8218..e51b65e5 100644
--- a/src/main/java/org/bukkit/inventory/meta/ItemMeta.java
+++ b/src/main/java/org/bukkit/inventory/meta/ItemMeta.java
@@ -1,12 +1,15 @@
 package org.bukkit.inventory.meta;
 
+import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
+import org.bukkit.Material;
 import org.bukkit.configuration.serialization.ConfigurationSerializable;
 import org.bukkit.enchantments.Enchantment;
 import org.bukkit.inventory.ItemFlag;
+import org.bukkit.util.ImmutableMaterialSet;
 
 /**
  * This type represents the storage mechanism for auxiliary item data.
@@ -155,6 +158,19 @@ public interface ItemMeta extends Cloneable, ConfigurationSerializable {
      */
     boolean hasItemFlag(ItemFlag flag);
 
+    ImmutableMaterialSet getCanDestroy();
+
+    void setCanDestroy(Collection<Material> materials);
+
+    void setCanDestroy(Material...materials);
+
+    ImmutableMaterialSet getCanPlaceOn();
+
+    void setCanPlaceOn(Collection<Material> materials);
+
+    void setCanPlaceOn(Material...materials);
+
+
     @SuppressWarnings("javadoc")
     ItemMeta clone();
 
diff --git a/src/main/java/org/bukkit/util/ImmutableMaterialSet.java b/src/main/java/org/bukkit/util/ImmutableMaterialSet.java
new file mode 100644
index 00000000..a0489886
--- /dev/null
+++ b/src/main/java/org/bukkit/util/ImmutableMaterialSet.java
@@ -0,0 +1,78 @@
+package org.bukkit.util;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.EnumSet;
+import java.util.Set;
+
+import com.google.common.collect.ForwardingSet;
+import org.bukkit.Material;
+
+/**
+ * Highly efficient immutable container for {@link Material}s. Useful for sharing
+ * large material lists.
+ */
+public class ImmutableMaterialSet extends ForwardingSet<Material> {
+
+    private final Set<Material> materials;
+
+    private ImmutableMaterialSet(Set<Material> materials) {
+        this.materials = materials;
+    }
+
+    private static final ImmutableMaterialSet EMPTY = new ImmutableMaterialSet(Collections.<Material>emptySet());
+
+    public static ImmutableMaterialSet of(ImmutableMaterialSet materials) {
+        return materials;
+    }
+
+    public static ImmutableMaterialSet of() {
+        return EMPTY;
+    }
+
+    public static ImmutableMaterialSet of(Material...materials) {
+        return new ImmutableMaterialSet(Collections.unmodifiableSet(EnumSet.copyOf(Arrays.asList(materials))));
+    }
+
+    public static ImmutableMaterialSet of(Collection<Material> materials) {
+        if(materials instanceof ImmutableMaterialSet) {
+            return (ImmutableMaterialSet) materials;
+        } else {
+            return new ImmutableMaterialSet(Collections.unmodifiableSet(EnumSet.copyOf(materials)));
+        }
+    }
+
+    @Override
+    protected Set<Material> delegate() {
+        return materials;
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static class Builder {
+        private final EnumSet<Material> materials = EnumSet.noneOf(Material.class);
+        private boolean built;
+
+        private void assertUnbuilt() {
+            if(built) throw new IllegalStateException("Already built");
+        }
+
+        public void add(Material material) {
+            assertUnbuilt();
+            materials.add(material);
+        }
+
+        public boolean isEmpty() {
+            assertUnbuilt();
+            return materials.isEmpty();
+        }
+
+        public ImmutableMaterialSet build() {
+            built = true;
+            return materials.isEmpty() ? EMPTY : new ImmutableMaterialSet(materials);
+        }
+    }
+}
-- 
2.50.1 (Apple Git-155)