430b33b7a3
this can be done through http://docs.oracle.com/javase/specs/jls/se6/html/arrays.html#10.6
180 lines
4.9 KiB
Java
180 lines
4.9 KiB
Java
/*
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* This file is part of Applied Energistics 2.
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* Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved.
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*
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* Applied Energistics 2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Applied Energistics 2 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
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*/
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package appeng.core.features;
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import java.lang.reflect.Constructor;
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import com.google.common.base.Function;
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import com.google.common.base.Optional;
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import com.google.common.base.Preconditions;
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import com.google.common.collect.ObjectArrays;
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import net.minecraft.block.Block;
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import net.minecraft.item.Item;
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import net.minecraft.item.ItemBlock;
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import net.minecraft.item.ItemStack;
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import net.minecraft.util.BlockPos;
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import net.minecraft.world.IBlockAccess;
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import appeng.api.definitions.IBlockDefinition;
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import appeng.block.AEBaseBlock;
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public class BlockDefinition extends ItemDefinition implements IBlockDefinition
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{
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private static final ItemBlockTransformer ITEMBLOCK_TRANSFORMER = new ItemBlockTransformer();
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private final Optional<Block> block;
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public BlockDefinition( final String identifier, Block block, ActivityState state )
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{
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super( identifier, constructItemFromBlock( block ), state );
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Preconditions.checkNotNull( block );
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Preconditions.checkNotNull( state );
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if( state == ActivityState.Enabled )
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{
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this.block = Optional.of( block );
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}
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else
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{
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this.block = Optional.absent();
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}
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}
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/**
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* Create an {@link ItemBlock} from a {@link Block} to register it later as {@link Item}
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*
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* @param block source block
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*
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* @return item from block
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*/
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private static Item constructItemFromBlock( Block block )
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{
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final Class<? extends ItemBlock> itemclass = getItemBlockConstructor( block );
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return constructItemBlock( block, itemclass );
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}
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/**
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* Returns the constructor to use.
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*
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* Either {@link ItemBlock} or in case of an {@link AEBaseBlock} the class returned by
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* AEBaseBlock.getItemBlockClass().
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*
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* @param block the block used to determine the used constructor.
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*
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* @return a {@link Class} extending ItemBlock
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*/
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private static Class<? extends ItemBlock> getItemBlockConstructor( Block block )
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{
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if( block instanceof AEBaseBlock )
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{
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final AEBaseBlock aeBaseBlock = (AEBaseBlock) block;
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return aeBaseBlock.getItemBlockClass();
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}
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return ItemBlock.class;
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}
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/**
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* Actually construct an instance of {@link Item} with the block and earlier determined constructor.
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*
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* Shamelessly stolen from the forge magic.
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*
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* TODO: throw an exception instead of returning null? As this could cause issue later on.
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*
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* @param block the block to create the {@link ItemBlock} from
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* @param itemclass the class used to construct it.
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*
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* @return an {@link Item} for the block. Actually always a sub type of {@link ItemBlock}
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*/
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private static Item constructItemBlock( Block block, Class<? extends ItemBlock> itemclass )
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{
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try
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{
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Object[] itemCtorArgs = {};
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Class<?>[] ctorArgClasses = new Class<?>[itemCtorArgs.length + 1];
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ctorArgClasses[0] = Block.class;
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for( int idx = 1; idx < ctorArgClasses.length; idx++ )
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{
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ctorArgClasses[idx] = itemCtorArgs[idx - 1].getClass();
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}
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Constructor<? extends ItemBlock> itemCtor = itemclass.getConstructor( ctorArgClasses );
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return itemCtor.newInstance( ObjectArrays.concat( block, itemCtorArgs ) );
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}
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catch( Throwable t )
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{
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return null;
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}
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}
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@Override
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public final Optional<Block> maybeBlock()
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{
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return this.block;
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}
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@Override
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public final Optional<ItemBlock> maybeItemBlock()
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{
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return this.block.transform( ITEMBLOCK_TRANSFORMER );
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}
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@Override
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public final Optional<ItemStack> maybeStack( int stackSize )
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{
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return this.block.transform( new ItemStackTransformer( stackSize ) );
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}
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@Override
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public final boolean isSameAs( IBlockAccess world, BlockPos pos )
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{
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return this.isEnabled() && world.getBlockState( pos ).getBlock() == this.block.get();
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}
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private static class ItemBlockTransformer implements Function<Block, ItemBlock>
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{
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@Override
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public ItemBlock apply( Block input )
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{
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return new ItemBlock( input );
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}
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}
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private static class ItemStackTransformer implements Function<Block, ItemStack>
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{
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private final int stackSize;
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public ItemStackTransformer( int stackSize )
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{
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Preconditions.checkArgument( stackSize > 0 );
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this.stackSize = stackSize;
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}
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@Override
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public ItemStack apply( Block input )
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{
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return new ItemStack( input, this.stackSize );
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}
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}
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}
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