Better edit messages for container editor

src/com/massivecraft/massivecore/command/editor/CommandEditAbstract.java

@@ -118,18 +118,27 @@ public class CommandEditAbstract<O, V> extends MassiveCommand
 		if (event.isCancelled()) return;
 		after = event.getAfter();
 		
-		// Setup
-		String descProperty = this.getProperty().getDisplayName();
-		String descObject = this.getObjectVisual();
-		String descValue = this.getInheritedVisual(source, before);
-		
 		// NoChange
 		// We check, inform and cancel on equality.
 		if (this.getValueType().equals(before, after))
 		{
-			msg("%s<silver> for %s<silver> already: %s", descProperty, descObject, descValue);
+			message(this.attemptSetNochangeMessage());
 			return;
 		}
+		this.attemptSetPerform(after);
+	}
+	
+	protected String attemptSetNochangeMessage()
+	{
+		
+		return Txt.parse("%s<silver> for %s<silver> already: %s", this.getProperty().getDisplayName(), this.getObjectVisual(), this.getInheritedVisual());
+	}
+	
+	protected void attemptSetPerform(V after)
+	{
+		String descProperty = this.getProperty().getDisplayName();
+		String descObject = this.getObjectVisual();
+		String descValue = this.getInheritedVisual();
 		
 		// Create messages
 		List<String> messages = new MassiveList<>();

src/com/massivecraft/massivecore/command/editor/CommandEditContainerAbstract.java

@@ -1,9 +1,11 @@
 package com.massivecraft.massivecore.command.editor;
 
 import java.util.AbstractMap.SimpleImmutableEntry;
+import java.util.Collection;
 import java.util.List;
 
 import com.massivecraft.massivecore.MassiveException;
+import com.massivecraft.massivecore.collections.MassiveList;
 import com.massivecraft.massivecore.command.requirement.RequirementEditorPropertyCreated;
 import com.massivecraft.massivecore.command.type.Type;
 import com.massivecraft.massivecore.command.type.TypeNullable;
@@ -78,6 +80,49 @@ public abstract class CommandEditContainerAbstract<O, V> extends CommandEditAbst
 		return alias;
 	}
 	
+	// -------------------------------------------- //
+	// ATTEMPT SET
+	// -------------------------------------------- //
+	
+	@Override
+	public String attemptSetNochangeMessage()
+	{
+		return Txt.parse("%s<silver> for %s<silver> was not changed.", this.getProperty().getDisplayName(), this.getObjectVisual());
+	}
+	
+	@SuppressWarnings("unchecked")
+	@Override
+	public void attemptSetPerform(V after)
+	{
+		V before = this.getInheritedValue();
+		String descProperty = this.getProperty().getDisplayName();
+		
+		// Apply
+		// We set the new property value.
+		this.getProperty().setValue(this.getObject(), after);
+		
+		// Create messages
+		List<String> messages = new MassiveList<>();
+		
+		messages.add(Txt.parse("%s<silver> for %s<silver> edited:", descProperty, this.getObjectVisual()));
+		
+		// Note: The result of getAdditions is not actually V, but the implementation doesn't care.
+		Collection<Object> additions = ContainerUtil.getAdditions(before, after);
+		if ( ! additions.isEmpty())
+		{
+			messages.add(Txt.parse("<k>Additions: %s", this.getValueType().getVisual((V) additions)));
+		}
+		
+		// Note: The result of getDeletions is not actually V, but the implementation doesn't care.
+		Collection<Object> deletions = ContainerUtil.getDeletions(before, after);
+		if ( ! deletions.isEmpty())
+		{
+			messages.add(Txt.parse("<k>Deletions: %s", this.getValueType().getVisual((V) deletions)));
+		}
+		
+		message(messages);
+	}
+	
 	// -------------------------------------------- //
 	// ABSTRACT
 	// -------------------------------------------- //

src/com/massivecraft/massivecore/util/ContainerUtil.java

@@ -5,7 +5,11 @@ import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.Map.Entry;
+
+import com.massivecraft.massivecore.collections.MassiveSet;
+
 import java.util.SortedMap;
 import java.util.SortedSet;
 
@@ -210,4 +214,24 @@ public class ContainerUtil
 		}
 	}
 	
+	// -------------------------------------------- //
+	// ADDITIONS & DELETIONS
+	// -------------------------------------------- //
+	
+	public static <E> Collection<E> getAdditions(Object before, Object after)
+	{
+		Collection<E> elements = ContainerUtil.getElements(after);
+		Set<E> ret = new MassiveSet<E>(elements);
+		ret.removeAll(ContainerUtil.getElements(before));
+		return ret;
+	}
+	
+	public static <E> Collection<E> getDeletions(Object before, Object after)
+	{
+		Collection<E> elements = ContainerUtil.getElements(before);
+		Set<E> ret = new MassiveSet<E>(elements);
+		ret.removeAll(ContainerUtil.getElements(after));
+		return ret;
+	}
+	
 }