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package org.hsqldb.types;

import java.io.DataInput;
import java.io.IOException;
import java.io.InputStream;

import org.hsqldb.SessionInterface;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.ArrayUtil;

Implementation of BlobData for memory binary data.

A Binary object instance always wraps a non-null byte[] object.
Author:
Fred Toussi (fredt@users dot sourceforge.net)
Version:
2.0.1
Since:
1.7.2/**
 * Implementation of BlobData for memory binary data.<p>
 * A Binary object instance always wraps a non-null byte[] object.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.0.1
 * @since 1.7.2
 */
public class BinaryData implements BlobData {

    public static final BinaryData singleBitZero =
        new BinaryData(new byte[]{ 0 }, 1);
    public static final BinaryData singleBitOne =
        new BinaryData(new byte[]{ -0x80 }, 1);
    public static final byte[] zeroLengthBytes = new byte[0];
    public static final BinaryData zeroLengthBinary =
        new BinaryData(zeroLengthBytes, false);
    long             id;
    protected byte[] data;
    private boolean  isBits;
    private long     bitLength;
    private int      hashCode = 0;

    public static BinaryData getBitData(byte[] data, long bitLength) {

        if (bitLength == 1) {
            return data[0] == 0 ? singleBitZero
                                : singleBitOne;
        }

        return new BinaryData(data, bitLength);
    }

    
This constructor is used inside the engine when an already serialized
byte[] is read from a file (.log, .script, .data or text table source).
In this case clone is false.
When a byte[] is submitted as a parameter of PreparedStatement then
clone is true.
/**
     * This constructor is used inside the engine when an already serialized
     * byte[] is read from a file (.log, .script, .data or text table source).
     * In this case clone is false.
     *
     * When a byte[] is submitted as a parameter of PreparedStatement then
     * clone is true.
     */
    public BinaryData(byte[] data, boolean clone) {

        if (clone) {
            data = (byte[]) ArrayUtil.duplicateArray(data);
        }

        this.data      = data;
        this.bitLength = data.length * 8L;
    }

    public BinaryData(SessionInterface session, BlobData b1, BlobData b2) {

        long length = (b1.length(session) + b2.length(session));

        if (length > Integer.MAX_VALUE
                || b1.length(session) > Integer.MAX_VALUE
                || b2.length(session) > Integer.MAX_VALUE) {
            throw Error.error(ErrorCode.X_22001);
        }

        data = new byte[(int) length];

        System.arraycopy(b1.getBytes(session, 0, (int) b1.length(session)), 0,
                         data, 0, (int) b1.length(session));
        System.arraycopy(b2.getBytes(session, 0, (int) b2.length(session)), 0,
                         data, (int) b1.length(session),
                         (int) b2.length(session));

        this.bitLength = (int) length * 8L;
    }

    public BinaryData(byte[] data, long bitLength) {

        this.data      = data;
        this.bitLength = bitLength;
        this.isBits    = true;
    }

    public BinaryData(long length, DataInput stream) {

        data      = new byte[(int) length];
        bitLength = data.length * 8L;

        try {
            stream.readFully(data);
        } catch (IOException e) {
            throw Error.error(ErrorCode.GENERAL_IO_ERROR, e);
        }
    }

    public byte[] getBytes() {
        return data;
    }

    public long length(SessionInterface session) {
        return data.length;
    }

    public long bitLength(SessionInterface session) {
        return bitLength;
    }

    public boolean isBits() {
        return isBits;
    }

    public byte[] getBytes(SessionInterface session, long pos, int length) {

        if (!isInLimits(data.length, pos, length)) {
            throw new IndexOutOfBoundsException();
        }

        byte[] bytes = new byte[length];

        System.arraycopy(data, (int) pos, bytes, 0, length);

        return bytes;
    }

    public BlobData getBlob(SessionInterface session, long pos, long length) {
        throw Error.runtimeError(ErrorCode.U_S0500, "BinaryData");
    }

    public InputStream getBinaryStream(SessionInterface session) {
        return new BlobInputStream(session, this, 0L, length(session));
    }

    public InputStream getBinaryStream(SessionInterface session, long pos,
                                       long length) {

        if (!isInLimits(data.length, pos, length)) {
            throw new IndexOutOfBoundsException();
        }

        return new BlobInputStream(session, this, pos, length(session));
    }

    public void setBytes(SessionInterface session, long pos, byte[] bytes,
                         int offset, int length) {

        if (!isInLimits(data.length, pos, 0)) {
            throw new IndexOutOfBoundsException();
        }

        if (!isInLimits(data.length, pos, length)) {
            data = (byte[]) ArrayUtil.resizeArray(data, (int) pos + length);
        }

        System.arraycopy(bytes, offset, data, (int) pos, length);

        bitLength = data.length * 8L;
    }

    public void setBytes(SessionInterface session, long pos, byte[] bytes) {
        setBytes(session, pos, bytes, 0, bytes.length);
    }

    public void setBytes(SessionInterface session, long pos, BlobData b,
                         long offset, long length) {

        if (length > Integer.MAX_VALUE) {
            throw new IndexOutOfBoundsException();
        }

        byte[] bytes = b.getBytes(session, offset, (int) length);

        setBytes(session, pos, bytes, 0, bytes.length);
    }

    public void setBinaryStream(SessionInterface session, long pos,
                                InputStream in) {

        //
    }

    public void truncate(SessionInterface session, long len) {

        if (data.length > len) {
            data      = (byte[]) ArrayUtil.resizeArray(data, (int) len);
            bitLength = data.length * 8L;
        }
    }

    public BlobData duplicate(SessionInterface session) {
        return new BinaryData(data, true);
    }

    public long position(SessionInterface session, byte[] pattern,
                         long start) {

        if (pattern.length > data.length) {
            return -1;
        }

        if (start >= data.length) {
            return -1;
        }

        return ArrayUtil.find(data, (int) start, data.length, pattern);
    }

    public long position(SessionInterface session, BlobData pattern,
                         long start) {

        if (pattern.length(session) > data.length) {
            return -1;
        }

        byte[] bytes = pattern.getBytes(session, 0,
                                        (int) pattern.length(session));

        return position(session, bytes, start);
    }

    
@todo
- implement/** @todo - implement */
    public long nonZeroLength(SessionInterface session) {
        return data.length;
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public int getStreamBlockSize() {
        return 512 * 1024;
    }

    public boolean isClosed() {
        return false;
    }

    public void free() {}

    public void setSession(SessionInterface session) {}

    //---
    static boolean isInLimits(long fullLength, long pos, long len) {
        return pos >= 0 && len >= 0 && pos + len <= fullLength;
    }

    public boolean isBinary() {
        return true;
    }

    public boolean equals(Object other) {

        if (other instanceof BinaryData) {
            return Type.SQL_VARBINARY.compare(null, this, other) == 0;
        }

        return false;
    }

    public int hashCode() {

        if (hashCode == 0) {
            int code = 0;

            for (int i = 0; i < data.length && i < 32; i++) {
                code = code * 31 + (0xff & data[i]);
            }

            hashCode = code;
        }

        return hashCode;
    }
}