Recommendations

You may often find situations where both ArmorPiece#getPreviousPiece() and ArmorPiece#getPiece() both share the same material type.

When this happens, there are two possibilities:

• ArmorPiece#getMethod() is Method#UNCHANGED

  The armour piece was not modified at all. This could happen f. eg. when a player modified another piece. You may filter it this way:

  for (ArmorPiece armorPiece : event.getArmorPieces()) {
      Method method = armorPiece.getMethod();
                     
      if (method == Method.UNCHANGED)
          continue;
  
      // The armor piece has suffered from a modification.
  }

• ArmorPiece#getMethod() is Method#DAMAGED

  In this case, the player did not implicitly have his armour modified. Instead, such piece got damaged.

  for (ArmorPiece armorPiece : event.getArmorPieces()) {                        
      if (armorPiece.hasBeenDamaged()) // The same as (armorpiece.getMethod() == Method.DAMAGED)
          continue;
  
      // The armor piece was not damaged.
  }

This information is compulsory to be borne in mind, as these situations will occasionally happen.