NBTBase.java

package net.minecraft.nbt;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import net.minecraft.crash.CrashReport;
import net.minecraft.crash.CrashReportCategory;
import net.minecraft.util.ReportedException;

public abstract class NBTBase
{
    public static final String[] NBTTypes = new String[] {"END", "BYTE", "SHORT", "INT", "LONG", "FLOAT", "DOUBLE", "BYTE[]", "STRING", "LIST", "COMPOUND", "INT[]"};

    /** The UTF string key used to lookup values. */
    private String name;

    /**
     * Write the actual data contents of the tag, implemented in NBT extension classes
     */
    abstract void write(DataOutput var1) throws IOException;

    /**
     * Read the actual data contents of the tag, implemented in NBT extension classes
     */
    abstract void load(DataInput var1) throws IOException;

    /**
     * Gets the type byte for the tag.
     */
    public abstract byte getId();

    protected NBTBase(String par1Str)
    {
        if (par1Str == null)
        {
            this.name = "";
        }
        else
        {
            this.name = par1Str;
        }
    }

    /**
     * Sets the name for this tag and returns this for convenience.
     */
    public NBTBase setName(String par1Str)
    {
        if (par1Str == null)
        {
            this.name = "";
        }
        else
        {
            this.name = par1Str;
        }

        return this;
    }

    /**
     * Gets the name corresponding to the tag, or an empty string if none set.
     */
    public String getName()
    {
        return this.name == null ? "" : this.name;
    }

    /**
     * Reads and returns a tag from the given DataInput, or the End tag if no tag could be read.
     */
    public static NBTBase readNamedTag(DataInput par0DataInput) throws IOException
    {
        byte var1 = par0DataInput.readByte();

        if (var1 == 0)
        {
            return new NBTTagEnd();
        }
        else
        {
            String var2 = par0DataInput.readUTF();
            NBTBase var3 = newTag(var1, var2);

            try
            {
                var3.load(par0DataInput);
                return var3;
            }
            catch (IOException var7)
            {
                CrashReport var5 = CrashReport.makeCrashReport(var7, "Loading NBT data");
                CrashReportCategory var6 = var5.makeCategory("NBT Tag");
                var6.addCrashSection("Tag name", var2);
                var6.addCrashSection("Tag type", Byte.valueOf(var1));
                throw new ReportedException(var5);
            }
        }
    }

    /**
     * Writes the specified tag to the given DataOutput, writing the type byte, the UTF string key and then calling the
     * tag to write its data.
     */
    public static void writeNamedTag(NBTBase par0NBTBase, DataOutput par1DataOutput) throws IOException
    {
        par1DataOutput.writeByte(par0NBTBase.getId());

        if (par0NBTBase.getId() != 0)
        {
            par1DataOutput.writeUTF(par0NBTBase.getName());
            par0NBTBase.write(par1DataOutput);
        }
    }

    /**
     * Creates and returns a new tag of the specified type, or null if invalid.
     */
    public static NBTBase newTag(byte par0, String par1Str)
    {
        switch (par0)
        {
            case 0:
                return new NBTTagEnd();
            case 1:
                return new NBTTagByte(par1Str);
            case 2:
                return new NBTTagShort(par1Str);
            case 3:
                return new NBTTagInt(par1Str);
            case 4:
                return new NBTTagLong(par1Str);
            case 5:
                return new NBTTagFloat(par1Str);
            case 6:
                return new NBTTagDouble(par1Str);
            case 7:
                return new NBTTagByteArray(par1Str);
            case 8:
                return new NBTTagString(par1Str);
            case 9:
                return new NBTTagList(par1Str);
            case 10:
                return new NBTTagCompound(par1Str);
            case 11:
                return new NBTTagIntArray(par1Str);
            default:
                return null;
        }
    }

    /**
     * Returns the string name of a tag with the specified type, or 'UNKNOWN' if invalid.
     */
    public static String getTagName(byte par0)
    {
        switch (par0)
        {
            case 0:
                return "TAG_End";
            case 1:
                return "TAG_Byte";
            case 2:
                return "TAG_Short";
            case 3:
                return "TAG_Int";
            case 4:
                return "TAG_Long";
            case 5:
                return "TAG_Float";
            case 6:
                return "TAG_Double";
            case 7:
                return "TAG_Byte_Array";
            case 8:
                return "TAG_String";
            case 9:
                return "TAG_List";
            case 10:
                return "TAG_Compound";
            case 11:
                return "TAG_Int_Array";
            default:
                return "UNKNOWN";
        }
    }

    /**
     * Creates a clone of the tag.
     */
    public abstract NBTBase copy();

    public boolean equals(Object par1Obj)
    {
        if (!(par1Obj instanceof NBTBase))
        {
            return false;
        }
        else
        {
            NBTBase var2 = (NBTBase)par1Obj;
            return this.getId() != var2.getId() ? false : ((this.name != null || var2.name == null) && (this.name == null || var2.name != null) ? this.name == null || this.name.equals(var2.name) : false);
        }
    }

    public int hashCode()
    {
        return this.name.hashCode() ^ this.getId();
    }
}