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Clarify in the LazyOptional which methods carry the lazyness over to the returned value and which don't. (#6750) 

For consistency, this meant making a few changes:
- Renamed the existing lazy mapping method to lazyMap, to indicate that it doesn't run the mapping immediately.
- Added a new implementation of map(), which returns Optional<T>, and resolves the value in the process.
- Changed filter() to return Optional, since there's no way to filter lazily.
- Added a new method resolve(), which helps convert the custom LazyOptional class into a standard Optional, for use
with library methods that expect Optional<T>.

* Update License headers.
This commit is contained in:
David Quintana 2020-08-25 03:11:28 +02:00 committed by GitHub
parent 625cd746ef
commit 600e68cace
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GPG Key ID: 4AEE18F83AFDEB23
16 changed files with 208 additions and 20 deletions
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1
src/main/java/net/minecraftforge/common/BiomeDictionary.java
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@ -16,6 +16,7 @@
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Biomes are completely redone in 1.16.2, reevaluate
package net.minecraftforge.common;

1
src/main/java/net/minecraftforge/common/BiomeManager.java
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@ -16,6 +16,7 @@
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* Biomes are completely redone in 1.16.2, reevaluate
package net.minecraftforge.common;

51
src/main/java/net/minecraftforge/common/util/LazyOptional.java
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@ -41,7 +41,7 @@ import net.minecraftforge.common.capabilities.Capability;
* (map/ifPresent) available, much like {@link Optional}.
* <p>
* It also provides the ability to listen for invalidation, via
* {@link #addListener(Consumer)}. This method is invoked when the provider of
* {@link #addListener(NonNullConsumer)}. This method is invoked when the provider of
* this object calls {@link #invalidate()}.
* <p>
* To create an instance of this class, use {@link #of(NonNullSupplier)}. Note
@ -150,7 +150,7 @@ public class LazyOptional<T>
* If non-empty, invoke the specified {@link NonNullConsumer} with the object,
* otherwise do nothing.
*
* @param The {@link NonNullConsumer} to run if this optional is non-empty.
* @param consumer The {@link NonNullConsumer} to run if this optional is non-empty.
* @throws NullPointerException if {@code consumer} is null and this {@link LazyOptional} is non-empty
*/
public void ifPresent(NonNullConsumer<? super T> consumer)
@ -171,19 +171,41 @@ public class LazyOptional<T>
* @apiNote This method supports post-processing on optional values, without the
* need to explicitly check for a return status.
*
* @param <U> The type of the result of the mapping function
* @apiNote The returned value does not receive invalidation messages from the original {@link LazyOptional}.
* If you need the invalidation, you will need to manage them yourself.
*
* @param mapper A mapping function to apply to the mod object, if present
* @return A {@link LazyOptional} describing the result of applying a mapping
* function to the value of this {@link LazyOptional}, if a value is
* present, otherwise an empty {@link LazyOptional}
* @throws NullPointerException if {@code mapper} is null and this {@link LazyOptional} is non-empty
* @throws NullPointerException if {@code mapper} is null.
*/
public <U> LazyOptional<U> map(NonNullFunction<? super T, ? extends U> mapper)
public <U> LazyOptional<U> lazyMap(NonNullFunction<? super T, ? extends U> mapper)
{
Objects.requireNonNull(mapper);
return isPresent() ? of(() -> mapper.apply(getValueUnsafe())) : empty();
}
/**
* If a this {@link LazyOptional} is non-empty, return a new
* {@link Optional} encapsulating the mapped value. Otherwise, returns
* {@link Optional#empty()}.
*
* @apiNote This method explicitly resolves the value of the {@link LazyOptional}.
* For a non-resolving mapper that will lazily run the mapping, use {@link #lazyMap(NonNullFunction)}.
*
* @param mapper A mapping function to apply to the mod object, if present
* @return An {@link Optional} describing the result of applying a mapping
* function to the value of this {@link Optional}, if a value is
* present, otherwise an empty {@link Optional}
* @throws NullPointerException if {@code mapper} is null.
*/
public <U> Optional<U> map(NonNullFunction<? super T, ? extends U> mapper)
{
Objects.requireNonNull(mapper);
return isPresent() ? Optional.of(mapper.apply(getValueUnsafe())) : Optional.empty();
}
/**
* Resolve the contained supplier if non-empty, and filter it by the given
* {@link NonNullPredicate}, returning empty if false.
@ -194,17 +216,26 @@ public class LazyOptional<T>
*
* @param predicate A {@link NonNullPredicate} to apply to the result of the
* contained supplier, if non-empty
* @return A {@link LazyOptional} containing the result of the contained
* @return An {@link Optional} containing the result of the contained
* supplier, if and only if the passed {@link NonNullPredicate} returns
* true, otherwise an empty {@link LazyOptional}
* true, otherwise an empty {@link Optional}
* @throws NullPointerException If {@code predicate} is null and this
* {@link LazyOptional} is non-empty
* {@link Optional} is non-empty
*/
public LazyOptional<T> filter(NonNullPredicate<? super T> predicate)
public Optional<T> filter(NonNullPredicate<? super T> predicate)
{
Objects.requireNonNull(predicate);
final T value = getValue(); // To keep the non-null contract we have to evaluate right now. Should we allow this function at all?
return value != null && predicate.test(value) ? of(() -> value) : empty();
return value != null && predicate.test(value) ? Optional.of(value) : Optional.empty();
}
/**
* Resolves the value of this LazyOptional, turning it into a standard non-lazy {@link Optional<T>}
* @return The resolved optional.
*/
public Optional<T> resolve()
{
return isPresent() ? Optional.of(getValueUnsafe()) : Optional.empty();
}
/**

19
src/main/java/net/minecraftforge/event/AddReloadListenerEvent.java
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@ -1,3 +1,22 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.event;
import com.google.common.collect.ImmutableList;

19
src/main/java/net/minecraftforge/event/RegisterCommandsEvent.java
View File

@ -1,3 +1,22 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.event;
import com.mojang.brigadier.CommandDispatcher;

19
src/main/java/net/minecraftforge/event/entity/EntityLeaveWorldEvent.java
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@ -1,3 +1,22 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.event.entity;
import net.minecraftforge.common.MinecraftForge;

6
src/main/java/net/minecraftforge/fluids/FluidUtil.java
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@ -48,6 +48,8 @@ import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.IItemHandler;
import net.minecraftforge.items.ItemHandlerHelper;
import java.util.Optional;
public class FluidUtil
{
private FluidUtil()
@ -428,7 +430,7 @@ public class FluidUtil
/**
* Helper method to get the fluid contained in an itemStack
*/
public static LazyOptional<FluidStack> getFluidContained(@Nonnull ItemStack container)
public static Optional<FluidStack> getFluidContained(@Nonnull ItemStack container)
{
if (!container.isEmpty())
{
@ -436,7 +438,7 @@ public class FluidUtil
return getFluidHandler(container)
.map(handler -> handler.drain(Integer.MAX_VALUE, IFluidHandler.FluidAction.SIMULATE));
}
return LazyOptional.empty();
return Optional.empty();
}
/**

4
src/main/java/net/minecraftforge/fml/client/gui/screen/ConfirmationScreen.java
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@ -15,9 +15,9 @@
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*//*
*/
/*
package net.minecraftforge.fml.client.gui.screen;
import net.minecraft.client.gui.widget.button.Button;
import net.minecraft.util.text.StringTextComponent;

4
src/main/java/net/minecraftforge/fml/client/gui/screen/NotificationScreen.java
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@ -15,9 +15,9 @@
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*//*
*/
/*
package net.minecraftforge.fml.client.gui.screen;
import com.mojang.blaze3d.matrix.MatrixStack;

19
src/main/java/net/minecraftforge/fml/event/lifecycle/IModBusEvent.java
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@ -1,3 +1,22 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.fml.event.lifecycle;
/**

7
src/main/java/net/minecraftforge/items/VanillaInventoryCodeHooks.java
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@ -38,6 +38,7 @@ import org.apache.commons.lang3.tuple.Pair;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Optional;
public class VanillaInventoryCodeHooks
{
@ -210,7 +211,7 @@ public class VanillaInventoryCodeHooks
return stack;
}
private static LazyOptional<Pair<IItemHandler, Object>> getItemHandler(IHopper hopper, Direction hopperFacing)
private static Optional<Pair<IItemHandler, Object>> getItemHandler(IHopper hopper, Direction hopperFacing)
{
double x = hopper.getXPos() + (double) hopperFacing.getXOffset();
double y = hopper.getYPos() + (double) hopperFacing.getYOffset();
@ -244,7 +245,7 @@ public class VanillaInventoryCodeHooks
return true;
}
public static LazyOptional<Pair<IItemHandler, Object>> getItemHandler(World worldIn, double x, double y, double z, final Direction side)
public static Optional<Pair<IItemHandler, Object>> getItemHandler(World worldIn, double x, double y, double z, final Direction side)
{
int i = MathHelper.floor(x);
int j = MathHelper.floor(y);
@ -262,6 +263,6 @@ public class VanillaInventoryCodeHooks
}
}
return LazyOptional.empty();
return Optional.empty();
}
}

19
src/test/java/net/minecraftforge/debug/block/ToolInteractTest.java
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@ -1,3 +1,22 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.debug.block;
import org.apache.logging.log4j.LogManager;

19
src/test/java/net/minecraftforge/debug/entity/player/PlayerNameEventTest.java
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@ -1,3 +1,22 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.debug.entity.player;
import net.minecraft.util.text.StringTextComponent;

2
src/test/java/net/minecraftforge/debug/item/CustomElytraTest.java
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@ -1,6 +1,6 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2019.
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public

19
src/test/java/net/minecraftforge/debug/item/EnderMaskTest.java
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@ -1,3 +1,22 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.debug.item;
import net.minecraft.entity.monster.EndermanEntity;

19
src/test/java/net/minecraftforge/debug/world/RaidEnumTest.java
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@ -1,3 +1,22 @@
/*
* Minecraft Forge
* Copyright (c) 2016-2020.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package net.minecraftforge.debug.world;
import net.minecraft.entity.EntityType;