MatchedNodeColors.java

/*
 * Copyright 2009-2011 Collaborative Research Centre SFB 632 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package annis.frontend.servlets;

import java.awt.Color;
import java.util.Locale;
import org.apache.commons.lang.StringUtils;

/**
 * Colors for matched nodes. The names and color values correspond to the
 * CSS standard.
 * @author thomas
 */
public enum MatchedNodeColors
{

  Red(new Color(255,0,0)),
  MediumVioletRed(new Color(199,21,133)),
  LimeGreen(new Color(50, 205, 50)),
  Peru(new Color(205,133,63)),
  IndianRed(new Color(205,92,92)),
  YellowGreen(new Color(173,255,47)),
  DarkRed(new Color(139,0,0)),
  OrangeRed(new Color(255,69,0));

  private final Color color;

  private MatchedNodeColors(Color color)
  {
    this.color = color;
  }

  public Color getColor()
  {
    return color;
  }

  /**
   * Returns the hexadecimal RGB representation beginning with a hash-sign.
   * @return the color in the format "#rrggbb"
   */
  public String getHTMLColor()
  {
    StringBuilder result = new StringBuilder("#");
    result.append(twoDigitHex(color.getRed()));
    result.append(twoDigitHex(color.getGreen()));
    result.append(twoDigitHex(color.getBlue()));
    return result.toString();
  }

  private String twoDigitHex(int i)
  {
    String result = Integer.toHexString(i).toLowerCase(Locale.ENGLISH);

    if(result.length() > 2)
    {
      result = result.substring(0,2);
    }
    else if(result.length() < 2)
    {
      result = StringUtils.leftPad(result, 2, '0');
    }
    return result;
  }

}