core/conn/jdbcT4/src/main/java/org/trafodion/jdbc/t4/TrafT4Blob.java

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package org.trafodion.jdbc.t4;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.SQLException;
import java.sql.Types;

public class TrafT4Blob extends TrafT4Lob implements Blob
{
	public TrafT4Blob(TrafT4Connection connection, String lobHandle, byte[] data) throws SQLException {
		super(connection, lobHandle, data, Types.BLOB);
	}

	public InputStream getBinaryStream() throws SQLException {
		testAvailability();
		return new ByteArrayInputStream((byte[]) data_);
	}

	public InputStream getBinaryStream(long pos, long length) throws SQLException {
		testAvailability();
		return new ByteArrayInputStream((byte[]) data_);
	}

	/*
	 * Retrieves all or part of the BLOB value that this Blob object represents,
	 * as an array of bytes. This byte array contains up to length consecutive
	 * bytes starting at position pos.
	 *  */

	public byte[] getBytes(long pos, int length) throws SQLException {
		testAvailability();

		byte[] buf = null;
		int startPos = (int)pos - 1;
		int endPos = startPos + length;

		byte[] binaryData = (byte[]) data_;
		if ((startPos > binaryData.length) || (startPos < 0) || (length < 0))
			throw TrafT4Messages.createSQLException(this.connection_.props_, this.connection_.getLocale(),
					"out_of_lob_bound", null);

		if ((endPos - 1) > binaryData.length) {
			length = binaryData.length - startPos;
		}
		buf = new byte[length];
		System.arraycopy(binaryData, startPos, buf, 0, length);

		return buf;
	}

	public int setBytes(long pos, byte[] bytes) throws SQLException {
		testAvailability();

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

	public int setBytes(long pos, byte[] bytes, int offset, int len) throws SQLException {
		testAvailability();
		OutputStream out = setBinaryStream(pos);

		try {
			out.write(bytes, offset, len);
		} catch (IOException e) {
			throw TrafT4Messages.createSQLException(this.connection_.props_, this.connection_.getLocale(),
					"lob_io_error", e.getMessage());
		} finally {
			try {
				out.close();
			} catch (IOException e2) {

			}
		}
		return len;
	}

	public long position(Blob pattern, long start) throws SQLException {
		return position(pattern.getBytes(0, (int) pattern.length()), start);
	}

	public long position(byte[] pattern, long start) throws SQLException {
		TrafT4Messages.throwUnsupportedFeatureException(connection_.props_, connection_.getLocale(), "position()");
		return 0;
	}

	public OutputStream setBinaryStream(long pos) throws SQLException {
		testAvailability();
		return setOutputStream(pos);
	}

	public void truncate(long len) throws SQLException {
		testAvailability();

		if (len < 0 || len > ((byte[]) data_).length) {
			throw TrafT4Messages.createSQLException(this.connection_.props_, this.connection_.getLocale(),
					"out_of_lob_bound", null);
		}

		byte[] newData = new byte[(int) len];

		System.arraycopy(this.data_, 0, newData, 0, (int) len);

		this.data_ = newData;
	}

	/*
	 * After free has been called, any attempt to invoke a method other than
	 * free will result in a SQLException being thrown.
	 */
	private void testAvailability() throws SQLException {
		if (isFreed_)
			throw TrafT4Messages.createSQLException(null, null, "lob_has_been_freed", null);
	}


	public long length() throws SQLException {
		testAvailability();
		return data_ == null ? 0 : ((byte[]) data_).length;
	}

	public void free() throws SQLException {
		data_ = null;
		isFreed_ = true;
	}
}