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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://www.schemacrawler.com
Copyright (c) 2000-2017, Sualeh Fatehi .
All rights reserved.
------------------------------------------------------------------------

SchemaCrawler 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.

SchemaCrawler and the accompanying materials are made available under
the terms of the Eclipse Public License v1.0, GNU General Public License
v3 or GNU Lesser General Public License v3.

You may elect to redistribute this code under any of these licenses.

The Eclipse Public License is available at:
http://www.eclipse.org/legal/epl-v10.html

The GNU General Public License v3 and the GNU Lesser General Public
License v3 are available at:
http://www.gnu.org/licenses/

========================================================================
*/
package sf.util;


import static sf.util.Utility.isBlank;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Optional;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Pattern;

public class RegularExpressionColorMap
{

  private static final Logger LOGGER = Logger
    .getLogger(RegularExpressionColorMap.class.getName());

  private final Map colorMap;

  public RegularExpressionColorMap()
  {
    colorMap = new HashMap<>();
  }

  public RegularExpressionColorMap(final Properties properties)
  {
    this();
    if (properties == null || properties.isEmpty())
    {
      return;
    }
    for (final Entry match: properties.entrySet())
    {
      if (match != null)
      {
        final Object key = match.getKey();
        final Object value = match.getValue();
        if (key != null && value != null)
        {
          final String regExpPattern = value.toString();
          final String htmlColor = key.toString();
          if (!isBlank(regExpPattern) && !isBlank(htmlColor)
              && htmlColor.length() == 6)
          {
            put(regExpPattern, "#" + htmlColor);
          }
          else
          {
            LOGGER.log(Level.CONFIG,
                       new StringFormat("Could not add color mapping for %s = %s",
                                        regExpPattern,
                                        htmlColor));
          }
        }
      }
    }
  }

  public boolean isEmpty()
  {
    return colorMap.isEmpty();
  }

  public Optional match(final String value)
  {
    for (final Pattern pattern: colorMap.keySet())
    {
      if (pattern.matcher(value).matches())
      {
        return Optional.of(colorMap.get(pattern));
      }
    }
    return Optional.empty();
  }

  public void put(final String regExpPattern, final String htmlColor)
  {
    try
    {
      if (isBlank(regExpPattern))
      {
        throw new IllegalArgumentException("No regular expression pattern provided");
      }

      final Pattern pattern = Pattern.compile(regExpPattern, 0);
      final Color color = Color.fromHexTriplet(htmlColor);
      colorMap.put(pattern, color);
    }
    catch (final Exception e)
    {
      LOGGER.log(Level.CONFIG,
                 e,
                 new StringFormat("Could not add color mapping for %s = %s",
                                  regExpPattern,
                                  htmlColor));
    }
  }

  public void putLiteral(final String literal, final Color color)
  {
    try
    {
      if (isBlank(literal))
      {
        throw new IllegalArgumentException("No literal key provided");
      }

      final Pattern pattern = Pattern.compile(literal, Pattern.LITERAL);
      colorMap.put(pattern, color);
    }
    catch (final Exception e)
    {
      LOGGER.log(Level.CONFIG,
                 e,
                 new StringFormat("Could not add literal color mapping for %s = %s",
                                  literal,
                                  color));
    }
  }

  public int size()
  {
    return colorMap.size();
  }

  @Override
  public String toString()
  {
    return Objects.toString(colorMap);
  }

}