appeng.core.features.ItemDefinition.java Source code

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Here is the source code for appeng.core.features.ItemDefinition.java

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/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 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 Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.core.features;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;

import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.world.IBlockAccess;

import appeng.api.definitions.IItemDefinition;
import appeng.util.Platform;

public class ItemDefinition implements IItemDefinition {
    private final Optional<Item> item;

    public ItemDefinition(final Item item, final ActivityState state) {
        Preconditions.checkNotNull(item);
        Preconditions.checkNotNull(state);

        if (state == ActivityState.Enabled) {
            this.item = Optional.of(item);
        } else {
            this.item = Optional.absent();
        }
    }

    @Override
    public final Optional<Item> maybeItem() {
        return this.item;
    }

    @Override
    public Optional<ItemStack> maybeStack(final int stackSize) {
        return this.item.transform(new ItemStackTransformer(stackSize));
    }

    @Override
    public boolean isEnabled() {
        return this.item.isPresent();
    }

    @Override
    public final boolean isSameAs(final ItemStack comparableStack) {
        return this.isEnabled() && Platform.isSameItemType(comparableStack, this.maybeStack(1).get());
    }

    @Override
    public boolean isSameAs(final IBlockAccess world, final int x, final int y, final int z) {
        return false;
    }

    private static class ItemStackTransformer implements Function<Item, ItemStack> {
        private final int stackSize;

        public ItemStackTransformer(final int stackSize) {
            Preconditions.checkArgument(stackSize > 0);

            this.stackSize = stackSize;
        }

        @Override
        public ItemStack apply(final Item input) {
            return new ItemStack(input, this.stackSize);
        }
    }
}