Added targeted.DataSpell

Has an option called variable-name which should be set to the name of a string variable to save data into.

There is an option called data-element which defaults to "uuid" and accepts a string.
This field determines what data will be saved to the string variable.
Current valid options are "uuid", "name", "customname", and "entitytype".

Author: TheComputerGeek2

src/com/nisovin/magicspells/spells/targeted/DataSpell.java

@@ -0,0 +1,54 @@
+package com.nisovin.magicspells.spells.targeted;
+
+import com.nisovin.magicspells.MagicSpells;
+import com.nisovin.magicspells.spells.TargetedSpell;
+import com.nisovin.magicspells.util.EntityData;
+import com.nisovin.magicspells.util.MagicConfig;
+import com.nisovin.magicspells.util.TargetInfo;
+import com.nisovin.magicspells.util.data.DataEntity;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+
+import java.util.function.Function;
+
+public class DataSpell extends TargetedSpell {
+	
+	
+	private String variableName;
+	private Function<? super LivingEntity, String> dataElement;
+	
+	public DataSpell(MagicConfig config, String spellName) {
+		super(config, spellName);
+		
+		this.variableName = getConfigString("variable-name", null);
+		this.dataElement = DataEntity.getDataFunction(getConfigString("data-element", "uuid"));
+		
+	}
+	
+	@Override
+	public void initialize() {
+		if (variableName == null) {
+			MagicSpells.error("variable-name is null for DataSpell");
+			return;
+		}
+		
+		if (dataElement == null) MagicSpells.error("Invalid option defined for data-element");
+	}
+	
+	@Override
+	public PostCastAction castSpell(Player player, SpellCastState state, float power, String[] args) {
+		if (state == SpellCastState.NORMAL) {
+			TargetInfo<LivingEntity> targetInfo = getTargetedEntity(player, power);
+			if (targetInfo == null) return noTarget(player);
+			LivingEntity target = targetInfo.getTarget();
+			if (target == null) return noTarget(player);
+			
+			String value = dataElement.apply(target);
+			MagicSpells.getVariableManager().set(variableName, player, value);
+			
+			playSpellEffects(player, target);
+		}
+		return PostCastAction.HANDLE_NORMALLY;
+	}
+	
+}

src/com/nisovin/magicspells/util/data/DataEntity.java

@@ -0,0 +1,24 @@
+package com.nisovin.magicspells.util.data;
+
+import org.bukkit.entity.Entity;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Function;
+
+public class DataEntity {
+	
+	private static Map<String, Function<Entity, String>> dataElements = new HashMap<>();
+	
+	static {
+		dataElements.put("uuid", entity -> entity.getUniqueId().toString());
+		dataElements.put("name", Entity::getName);
+		dataElements.put("customname", Entity::getCustomName);
+		dataElements.put("entitytype", entity -> entity.getType().name());
+	}
+	
+	public static Function<Entity, String> getDataFunction(String elementId) {
+		return dataElements.get(elementId);
+	}
+	
+}