appeng.util.item.AEStack.java Source code

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Here is the source code for appeng.util.item.AEStack.java

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/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, 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.util.item;

import java.io.IOException;

import io.netty.buffer.ByteBuf;

import appeng.api.storage.data.IAEStack;

public abstract class AEStack<StackType extends IAEStack> implements IAEStack<StackType> {

    private boolean isCraftable;
    private long stackSize;
    private long countRequestable;

    static long getPacketValue(final byte type, final ByteBuf tag) {
        if (type == 0) {
            long l = tag.readByte();
            l -= Byte.MIN_VALUE;
            return l;
        } else if (type == 1) {
            long l = tag.readShort();
            l -= Short.MIN_VALUE;
            return l;
        } else if (type == 2) {
            long l = tag.readInt();
            l -= Integer.MIN_VALUE;
            return l;
        }

        return tag.readLong();
    }

    @Override
    public long getStackSize() {
        return this.stackSize;
    }

    @Override
    public StackType setStackSize(final long ss) {
        this.stackSize = ss;
        return (StackType) this;
    }

    @Override
    public long getCountRequestable() {
        return this.countRequestable;
    }

    @Override
    public StackType setCountRequestable(final long countRequestable) {
        this.countRequestable = countRequestable;
        return (StackType) this;
    }

    @Override
    public boolean isCraftable() {
        return this.isCraftable;
    }

    @Override
    public StackType setCraftable(final boolean isCraftable) {
        this.isCraftable = isCraftable;
        return (StackType) this;
    }

    @Override
    public StackType reset() {
        this.stackSize = 0;
        // priority = Integer.MIN_VALUE;
        this.setCountRequestable(0);
        this.setCraftable(false);
        return (StackType) this;
    }

    @Override
    public boolean isMeaningful() {
        return this.stackSize != 0 || this.countRequestable > 0 || this.isCraftable;
    }

    @Override
    public void incStackSize(final long i) {
        this.stackSize += i;
    }

    @Override
    public void decStackSize(final long i) {
        this.stackSize -= i;
    }

    @Override
    public void incCountRequestable(final long i) {
        this.countRequestable += i;
    }

    @Override
    public void decCountRequestable(final long i) {
        this.countRequestable -= i;
    }

    @Override
    public void writeToPacket(final ByteBuf i) throws IOException {
        final byte mask = (byte) (this.getType(0) | (this.getType(this.stackSize) << 2)
                | (this.getType(this.countRequestable) << 4) | ((byte) (this.isCraftable ? 1 : 0) << 6)
                | (this.hasTagCompound() ? 1 : 0) << 7);

        i.writeByte(mask);
        this.writeIdentity(i);

        this.readNBT(i);

        // putPacketValue( i, priority );
        this.putPacketValue(i, this.stackSize);
        this.putPacketValue(i, this.countRequestable);
    }

    private byte getType(final long num) {
        if (num <= 255) {
            return 0;
        } else if (num <= 65535) {
            return 1;
        } else if (num <= 4294967295L) {
            return 2;
        } else {
            return 3;
        }
    }

    abstract boolean hasTagCompound();

    abstract void writeIdentity(ByteBuf i) throws IOException;

    abstract void readNBT(ByteBuf i) throws IOException;

    private void putPacketValue(final ByteBuf tag, final long num) {
        if (num <= 255) {
            tag.writeByte((byte) (num + Byte.MIN_VALUE));
        } else if (num <= 65535) {
            tag.writeShort((short) (num + Short.MIN_VALUE));
        } else if (num <= 4294967295L) {
            tag.writeInt((int) (num + Integer.MIN_VALUE));
        } else {
            tag.writeLong(num);
        }
    }
}