How to use

getOperation

method

in

net.minecraft.entity.ai.attributes.AttributeModifier

if (attributemodifier.getOperation() != 1 && attributemodifier.getOperation() != 2) {
  d1 = d0;
} else {
  ret.add(new TextComponentString("     " + StringHelper.LIGHT_BLUE + I18n.translateToLocalFormatted("attribute.modifier.plus." + attributemodifier.getOperation(), ItemStack.DECIMALFORMAT.format(d1), I18n.translateToLocal("attribute.name." + entry.getKey()))));
} else if (d0 < 0.0D) {
  d1 = -d1;
  ret.add(new TextComponentString("     " + StringHelper.LIGHT_RED + I18n.translateToLocalFormatted("attribute.modifier.take." + attributemodifier.getOperation(), ItemStack.DECIMALFORMAT.format(d1), I18n.translateToLocal("attribute.name." + entry.getKey()))));

@SideOnly(Side.CLIENT)
public void addDetails(ItemStack itemstack, EntityPlayer player, @Nullable World worldIn, List<String> infos) {
  super.addDetails(itemstack, player, worldIn, infos);
  Multimap<String, AttributeModifier> multimap = getModifiers(MOPlayerCapabilityProvider.GetAndroidCapability(player), itemstack);
  if (multimap != null) {
    multimap.values()
        .forEach(modifier -> {
          switch (modifier.getOperation()) {
            case 0:
              infos.add(TextFormatting.GREEN + String.format("%s: +%s", modifier.getName(), modifier.getAmount()));
              break;
            case 1:
              infos.add(TextFormatting.GREEN + String.format("%s: %s", modifier.getName(), (modifier.getAmount() >= 0 ? "+" : "") + DecimalFormat.getPercentInstance().format(modifier.getAmount())));
              break;
            default:
              infos.add(TextFormatting.GREEN + String.format("%s: %s", modifier.getName(), DecimalFormat.getPercentInstance().format(modifier.getAmount() + 1)));
          }
        });
  }
}

  for (Entry<IAttribute, AttributeModifier> entry : map.entrySet()) {
    AttributeModifier attributemodifier = entry.getValue();
    AttributeModifier attributemodifier1 = new AttributeModifier(attributemodifier.getName(), potion.getAttributeModifierAmount(effect.getAmplifier(), attributemodifier), attributemodifier.getOperation());
    list1.add(new Tuple((entry.getKey()).getName(), attributemodifier1));
double d1;
if (attributemodifier2.getOperation() != 1 && attributemodifier2.getOperation() != 2) {
  d1 = attributemodifier2.getAmount();
} else {
  list.add(TextFormatting.BLUE + StringHelper.localizeFormat("attribute.modifier.plus." + attributemodifier2.getOperation(), ItemStack.DECIMALFORMAT.format(d1), StringHelper.localize("attribute.name." + tuple.getFirst())));
} else if (d0 < 0.0D) {
  d1 = d1 * -1.0D;
  list.add(TextFormatting.RED + StringHelper.localizeFormat("attribute.modifier.take." + attributemodifier2.getOperation(), ItemStack.DECIMALFORMAT.format(d1), StringHelper.localize("attribute.name." + tuple.getFirst())));

      new AttributeModifier(modifier.getName(),
          potion.getAttributeModifierAmount(potionEffect.getAmplifier(), modifier),
          modifier.getOperation())));
double d0 = modifier.getAmount();
double d1;
if (modifier.getOperation() != 1 && modifier.getOperation() != 2) {
  d1 = modifier.getAmount();
} else {
  lines.add(TextFormatting.BLUE + I18n.format("attribute.modifier.plus." + modifier.getOperation(), ItemStack.DECIMALFORMAT.format(d1), I18n.format("attribute.name." + tuple.getFirst())));
} else if (d0 < 0.0D) {
  d1 = d1 * -1.0D;
  lines.add(TextFormatting.RED + I18n.format("attribute.modifier.take." + modifier.getOperation(), ItemStack.DECIMALFORMAT.format(d1), I18n.format("attribute.name." + tuple.getFirst())));

for (Entry<IAttribute, AttributeModifier> entry : map.entrySet()) {
  AttributeModifier modifier = entry.getValue();
  attributes.put(entry.getKey().getName(), new AttributeModifier(modifier.getName(), potion.getAttributeModifierAmount(effect.getAmplifier(), modifier), modifier.getOperation()));
double amount1;
if (modifier.getOperation() != 1 && modifier.getOperation() != 2)
  amount1 = modifier.getAmount();
else
  list.add(TextFormatting.BLUE + new TextComponentTranslation("attribute.modifier.plus." + modifier.getOperation(), new Object[] { ItemStack.DECIMALFORMAT.format(amount1), new TextComponentTranslation("attribute.name." + entry.getKey()) }).getFormattedText());
else if (amount0 < 0.0D) {
  amount1 *= -1.0D;
  list.add(TextFormatting.RED + new TextComponentTranslation("attribute.modifier.take." + modifier.getOperation(), new Object[] { ItemStack.DECIMALFORMAT.format(amount1), new TextComponentTranslation("attribute.name." + entry.getKey()) }).getFormattedText());

public ItemStack addAttributeToPart(ItemStack part, AttributeModifier attribute) {
  if (part.getTagCompound() == null) {
    part.setTagCompound(new NBTTagCompound());
  }
  NBTTagList attributeList = part.getTagCompound().getTagList("CustomAttributes", Constants.NBT.TAG_COMPOUND);
  NBTTagCompound attributeTag = new NBTTagCompound();
  attributeTag.setString("Name", attribute.getName());
  attributeTag.setDouble("Amount", attribute.getAmount());
  attributeTag.setString("UUID", attribute.getID().toString());
  attributeTag.setByte("Operation", (byte) attribute.getOperation());
  attributeList.appendTag(attributeTag);
  part.setTagInfo("CustomAttributes", attributeList);
  return part;
}