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/**
 * Copyright (c) 2013, impossibl.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of impossibl.com nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.impossibl.postgres.jdbc;

import java.io.IOException;
import java.io.OutputStream;
import java.sql.SQLException;

public class BlobOutputStream extends OutputStream {

  PGBlob owner;
  LargeObject lo;
  byte[] buf;
  int pos;

  public BlobOutputStream(PGBlob owner, LargeObject lo) {
    super();
    this.owner = owner;
    this.lo = lo;
    this.pos = 0;
    this.buf = new byte[1024];
  }


  @Override
  public void write(int b) throws IOException {
    checkClosed();

    if (pos >= buf.length) {
      writeNextRegion();
    }

    buf[pos++] = (byte)b;
  }


  @Override
  public void write(byte[] b) throws IOException {
    write(b, 0, b.length);
  }


  @Override
  public void write(byte[] b, int off, int len) throws IOException {
    checkClosed();

    if (pos > 0) {
      writeNextRegion();
    }

    try {
      lo.write(b, off, len);
    }
    catch (SQLException e) {
      throw new IOException(e);
    }

  }

  @Override
  public void flush() throws IOException {
    if (lo == null) {
      return;
    }

    if (pos > 0) {
      writeNextRegion();
    }
  }

  @Override
  public void close() throws IOException {
    if (lo == null) {
      return;
    }

    flush();
    try {
      lo.close();
    }
    catch (SQLException e) {
      throw new IOException("Error closing stream", e);
    }
    if (owner != null) {
      owner.removeStream(lo);
    }
    owner = null;
    lo = null;
  }

  private void writeNextRegion() throws IOException {

    try {
      lo.write(buf, 0, pos);
      pos = 0;
    }
    catch (SQLException e) {
      throw new IOException(e);
    }

  }

  private void checkClosed() throws IOException {
    if (lo == null) {
      throw new IOException("Stream is closed");
    }
  }

}