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SchemaCrawler is an open-source Java API that makes working with database metadata as easy as working with plain old Java objects. SchemaCrawler is also a database schema discovery and comprehension, and schema documentation tool. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format. The output is designed to be diff-ed against other database schemas.

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/*
 *
 * SchemaCrawler
 * http://sourceforge.net/projects/schemacrawler
 * Copyright (c) 2000-2014, Sualeh Fatehi.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

package schemacrawler.crawl;


import schemacrawler.schema.BaseColumn;
import schemacrawler.schema.ColumnDataType;
import schemacrawler.schema.DatabaseObjectReference;
import schemacrawler.schema.JavaSqlType.JavaSqlTypeGroup;
import schemacrawler.schema.NamedObject;

/**
 * Represents a column in a database for tables and routines. Created
 * from metadata returned by a JDBC call.
 *
 * @author Sualeh Fatehi
 */
abstract class AbstractColumn
  extends AbstractDependantObject

  implements BaseColumn

{

  private static final long serialVersionUID = -8492662324895309485L;

  private ColumnDataType columnDataType;
  private int ordinalPosition;
  private int size;
  private int decimalDigits;
  private boolean nullable;

  AbstractColumn(final P parent, final String name)
  {
    super(parent, name);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public int compareTo(final NamedObject obj)
  {
    if (obj == null)
    {
      return -1;
    }

    final BaseColumn
 other = (BaseColumn) obj;
    int comparison = 0;

    if (comparison == 0)
    {
      comparison = ordinalPosition - other.getOrdinalPosition();
    }
    if (comparison == 0)
    {
      comparison = super.compareTo(other);
    }

    return comparison;
  }

  /**
   * {@inheritDoc}
   *
   * @see schemacrawler.schema.BaseColumn#getColumnDataType()
   */
  @Override
  public final ColumnDataType getColumnDataType()
  {
    return columnDataType;
  }

  /**
   * {@inheritDoc}
   *
   * @see schemacrawler.schema.BaseColumn#getDecimalDigits()
   */
  @Override
  public final int getDecimalDigits()
  {
    return decimalDigits;
  }

  /**
   * {@inheritDoc}
   *
   * @see schemacrawler.schema.BaseColumn#getOrdinalPosition()
   */
  @Override
  public final int getOrdinalPosition()
  {
    return ordinalPosition;
  }

  /**
   * {@inheritDoc}
   *
   * @see schemacrawler.schema.BaseColumn#getSize()
   */
  @Override
  public final int getSize()
  {
    return size;
  }

  /**
   * {@inheritDoc}
   *
   * @see schemacrawler.schema.TypedObject#getType()
   */
  @Override
  public final ColumnDataType getType()
  {
    return getColumnDataType();
  }

  /**
   * {@inheritDoc}
   *
   * @see schemacrawler.schema.BaseColumn#getWidth()
   */
  @Override
  public final String getWidth()
  {

    final ColumnDataType columnDataType = getColumnDataType();
    if (columnDataType == null)
    {
      return "";
    }

    if (size <= 0 || size >= 2_000_000_000)
    {
      return "";
    }

    final JavaSqlTypeGroup sqlDataTypeGroup = columnDataType.getJavaSqlType()
      .getJavaSqlTypeGroup();
    final boolean needWidth = sqlDataTypeGroup == JavaSqlTypeGroup.character
                              || sqlDataTypeGroup == JavaSqlTypeGroup.real;

    final StringBuilder columnWidthBuffer = new StringBuilder();
    if (needWidth)
    {
      columnWidthBuffer.append('(');
      columnWidthBuffer.append(size);
      if (sqlDataTypeGroup == JavaSqlTypeGroup.real)
      {
        columnWidthBuffer.append(", ").append(getDecimalDigits());
      }
      columnWidthBuffer.append(')');
    }

    return columnWidthBuffer.toString();

  }

  /**
   * {@inheritDoc}
   *
   * @see schemacrawler.schema.BaseColumn#isNullable()
   */
  @Override
  public final boolean isNullable()
  {
    return nullable;
  }

  void setColumnDataType(final ColumnDataType columnDataType)
  {
    this.columnDataType = columnDataType;
  }

  final void setDecimalDigits(final int decimalDigits)
  {
    this.decimalDigits = decimalDigits;
  }

  final void setNullable(final boolean nullable)
  {
    this.nullable = nullable;
  }

  final void setOrdinalPosition(final int ordinalPosition)
  {
    this.ordinalPosition = ordinalPosition;
  }

  /**
   * Sets the column size.
   *
   * @param size
   *        Size of the column
   */
  final void setSize(final int size)
  {
    this.size = size;
  }

}