Written Book Attributes

src/main/java/com/simibubi/create/content/logistics/item/filter/ItemAttribute.java

@@ -9,9 +9,7 @@ import java.util.function.BiPredicate;
 import java.util.function.Predicate;
 import java.util.stream.Collectors;
 
-import com.simibubi.create.content.logistics.item.filter.attribute.EnchantAttribute;
+import com.simibubi.create.content.logistics.item.filter.attribute.*;
-import com.simibubi.create.content.logistics.item.filter.attribute.FluidContentsAttribute;
-import com.simibubi.create.content.logistics.item.filter.attribute.ItemNameAttribute;
 import net.minecraftforge.fluids.capability.CapabilityFluidHandler;
 import org.apache.commons.lang3.StringUtils;
 
@@ -50,6 +48,8 @@ public interface ItemAttribute {
 	static ItemAttribute hasEnchant = register(new EnchantAttribute("dummy"));
 	static ItemAttribute hasFluid = register(new FluidContentsAttribute("dummy"));
 	static ItemAttribute hasName = register(new ItemNameAttribute("dummy"));
+	static ItemAttribute bookAuthor = register(new BookAuthorAttribute("dummy"));
+	static ItemAttribute bookCopy = register(new BookCopyAttribute(-1));
 	static ItemAttribute addedBy = register(new AddedBy("dummy"));
 
 	static ItemAttribute register(ItemAttribute attributeType) {

src/main/java/com/simibubi/create/content/logistics/item/filter/attribute/BookAuthorAttribute.java

@@ -0,0 +1,63 @@
+package com.simibubi.create.content.logistics.item.filter.attribute;
+
+import com.google.gson.JsonParseException;
+import com.simibubi.create.content.logistics.item.filter.ItemAttribute;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.WrittenBookItem;
+import net.minecraft.nbt.CompoundNBT;
+import net.minecraft.util.text.ITextComponent;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class BookAuthorAttribute implements ItemAttribute {
+    String author;
+
+    public BookAuthorAttribute(String author) {
+        this.author = author;
+    }
+
+    @Override
+    public boolean appliesTo(ItemStack itemStack) {
+        return extractAuthor(itemStack).equals(author);
+    }
+
+    @Override
+    public List<ItemAttribute> listAttributesOf(ItemStack itemStack) {
+        String name = extractAuthor(itemStack);
+
+        List<ItemAttribute> atts = new ArrayList<>();
+        if(name.length() > 0) {
+            atts.add(new BookAuthorAttribute(name));
+        }
+        return atts;
+    }
+
+    @Override
+    public String getTranslationKey() {
+        return "book_author";
+    }
+
+    @Override
+    public Object[] getTranslationParameters() {
+        return new Object[] {author};
+    }
+
+    @Override
+    public void writeNBT(CompoundNBT nbt) {
+        nbt.putString("author", this.author);
+    }
+
+    @Override
+    public ItemAttribute readNBT(CompoundNBT nbt) {
+        return new BookAuthorAttribute(nbt.getString("author"));
+    }
+
+    private String extractAuthor(ItemStack stack) {
+        CompoundNBT nbt = stack.getTag();
+        if (nbt != null && nbt.contains("author")) {
+            return nbt.getString("author");
+        }
+        return "";
+    }
+}

src/main/java/com/simibubi/create/content/logistics/item/filter/attribute/BookCopyAttribute.java

@@ -0,0 +1,66 @@
+package com.simibubi.create.content.logistics.item.filter.attribute;
+
+import com.simibubi.create.content.logistics.item.filter.ItemAttribute;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.item.WrittenBookItem;
+import net.minecraft.nbt.CompoundNBT;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class BookCopyAttribute implements ItemAttribute {
+    int generation;
+
+    public BookCopyAttribute(int generation) {
+        this.generation = generation;
+    }
+
+    @Override
+    public boolean appliesTo(ItemStack itemStack) {
+        return extractGeneration(itemStack) == generation;
+    }
+
+    @Override
+    public List<ItemAttribute> listAttributesOf(ItemStack itemStack) {
+        int generation = extractGeneration(itemStack);
+
+        List<ItemAttribute> atts = new ArrayList<>();
+        if(generation >= 0) {
+            atts.add(new BookCopyAttribute(generation));
+        }
+        return atts;
+    }
+
+    @Override
+    public String getTranslationKey() {
+        switch(generation){
+            case 0:
+                return "book_copy_original";
+            case 1:
+                return "book_copy_first";
+            case 2:
+                return "book_copy_second";
+            default:
+                return "book_copy_tattered";
+        }
+    }
+
+    @Override
+    public void writeNBT(CompoundNBT nbt) {
+        nbt.putInt("generation", this.generation);
+    }
+
+    @Override
+    public ItemAttribute readNBT(CompoundNBT nbt) {
+        return new BookCopyAttribute(nbt.getInt("generation"));
+    }
+
+    private int extractGeneration(ItemStack stack) {
+        CompoundNBT nbt = stack.getTag();
+        if (nbt != null && stack.getItem() instanceof WrittenBookItem) {
+            return nbt.getInt("generation");
+        }
+        return -1;
+    }
+}