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JDBC Driver for the Firebird RDBMS
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/*
 * Firebird Open Source JavaEE Connector - JDBC Driver
 *
 * Distributable under LGPL license.
 * You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
 *
 * This program 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
 * LGPL License for more details.
 *
 * This file was created by members of the firebird development team.
 * All individual contributions remain the Copyright (C) of those
 * individuals.  Contributors to this file are either listed here or
 * can be obtained from a source control history command.
 *
 * All rights reserved.
 */
package org.firebirdsql.gds.ng.wire;

import org.firebirdsql.gds.BlobParameterBuffer;
import org.firebirdsql.gds.ISCConstants;
import org.firebirdsql.gds.JaybirdErrorCodes;
import org.firebirdsql.gds.ng.FbBlob;
import org.firebirdsql.gds.ng.FbExceptionBuilder;

import java.sql.SQLException;

/**
 * @author Mark Rotteveel
 * @since 3.0
 */
public abstract class AbstractFbWireOutputBlob extends AbstractFbWireBlob {

    private long blobId;

    protected AbstractFbWireOutputBlob(FbWireDatabase database, FbWireTransaction transaction,
                                       BlobParameterBuffer blobParameterBuffer) {
        super(database, transaction, blobParameterBuffer);
    }

    @Override
    public final long getBlobId() {
        return blobId;
    }

    /**
     * Sets the blob id.
     *
     * @param blobId
     *         Blob id.
     * @throws SQLException
     *         If this is an input blob, or if this is an output blob whose blobId was already set.
     */
    protected final void setBlobId(long blobId) throws SQLException {
        synchronized (getSynchronizationObject()) {
            if (getBlobId() != FbBlob.NO_BLOB_ID) {
                throw new FbExceptionBuilder().nonTransientException(JaybirdErrorCodes.jb_blobIdAlreadySet).toSQLException();
            }
            this.blobId = blobId;
        }
    }

    @Override
    public final boolean isOutput() {
        return true;
    }

    @Override
    public final byte[] getSegment(int sizeRequested) throws SQLException {
        try {
            throw new FbExceptionBuilder().nonTransientException(ISCConstants.isc_segstr_no_read).toSQLException();
        } catch (SQLException e) {
            exceptionListenerDispatcher.errorOccurred(e);
            throw e;
        }
    }

    @Override
    public final void seek(int offset, SeekMode seekMode) throws SQLException {
        try {
            // This assumes seeks are not (nor in the future) supported on output blobs
            throw new FbExceptionBuilder().nonTransientException(ISCConstants.isc_segstr_no_read).toSQLException();
        } catch (SQLException e) {
            exceptionListenerDispatcher.errorOccurred(e);
            throw e;
        }
    }
}