com.terrain.WorldBlock.java Source code

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Here is the source code for com.terrain.WorldBlock.java

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/**
 * Copyright 2011 Taggart Spilman
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.terrain;

import java.util.Formatter;
import java.util.Locale;

import org.apache.commons.lang3.Validate;
import org.jnbt.ByteArrayTag;
import org.jnbt.CompoundTag;
import org.jnbt.Tag;

import com.tag.Utils;

// TODO: implement Saveable
public class WorldBlock implements Block {

    private final WorldChunk chunk;
    private final int x, y, z;

    public WorldBlock(WorldChunk chunk, int x, int y, int z) {
        Validate.notNull(chunk, "chunk must not be null");
        this.chunk = chunk;
        this.x = x;
        this.y = y;
        this.z = z;
    }

    public Chunk getChunk() {
        return this.chunk;
    }

    /**
     * 
     * @return
     * @see <a
     *      href="http://www.minecraftwiki.net/wiki/Alpha_Level_Format/Chunk_File_Format#Block_Format">Block
     *      Format</a>
     */
    public final int getIndex() {
        return y + (z * MAX_Y + (x * MAX_Y * MAX_Z));
    }

    @Override
    public int getLocalX() {
        return this.x;
    }

    @Override
    public int getLocalZ() {
        return this.z;
    }

    @Override
    public int getAltitude() {
        return this.y;
    }

    @Override
    public int getAbsoluteX() {
        throw new IllegalStateException("stub");
    }

    @Override
    public int getAbsoluteZ() {
        throw new IllegalStateException("stub");
    }

    @Override
    public int getBlockID() {
        byte[] bytes = getByteArray("Blocks");
        if (bytes != null) {
            int index = getIndex();
            return bytes[index];
        }
        return -1;
    }

    public void setBlockID(int blockID) {
        byte[] bytes = getByteArray("Blocks");
        if (bytes != null) {
            int index = getIndex();
            bytes[index] = (byte) blockID;
        }
    }

    @Override
    public int getData() {
        byte[] bytes = getByteArray("Data");
        if (bytes != null) {
            int index = getIndex();
            return halfByte(bytes, index);
        }
        return -1;
    }

    @Override
    public int getSkyLight() {
        byte[] bytes = getByteArray("SkyLight");
        if (bytes != null) {
            int index = getIndex();
            return halfByte(bytes, index);
        }
        return -1;
    }

    @Override
    public int getBlockLight() {
        byte[] bytes = getByteArray("BlockLight");
        if (bytes != null) {
            int index = getIndex();
            return halfByte(bytes, index);
        }
        return -1;
    }

    private byte[] getByteArray(String name) {
        if (chunk.chunkTag instanceof CompoundTag) {
            CompoundTag tag = (CompoundTag) chunk.chunkTag;
            Tag<?> search = tag.search(name);
            if (search instanceof ByteArrayTag) {
                ByteArrayTag baTag = (ByteArrayTag) search;
                return baTag.getValue();
            }
        }
        return null;
    }

    private int halfByte(byte[] data, int index) {
        int i = index / 2;
        byte b = data[i];
        boolean even = (index == 0) || (index % 2 == 0);
        // TODO: make sure I didn't reverse the order
        return (even ? Utils.getLow(b) : Utils.getHigh(b));
    }

    @Override
    public String getName() {
        StringBuilder sb = new StringBuilder();
        Formatter formatter = new Formatter(sb, Locale.US);
        formatter.format("Block [x=%1s, z=%1s, y=%1s]", getLocalX(), getLocalZ(), getAltitude());
        return sb.toString();
    }

    @Override
    public String toString() {
        return getName();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + x;
        result = prime * result + y;
        result = prime * result + z;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        WorldBlock other = (WorldBlock) obj;
        if (x != other.x)
            return false;
        if (y != other.y)
            return false;
        if (z != other.z)
            return false;
        return true;
    }

}