HtmlLength.java

/*
    GNU LESSER GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
 */
/*
 * Created on Nov 19, 2005
 */
package org.lobobrowser.html.style;

public final class HtmlLength {
  // Note: Preferred type has higher value
  public static final int PIXELS = 1;
  public static final int LENGTH = 2;
  public static final int MULTI_LENGTH = 0;

  public static final HtmlLength[] EMPTY_ARRAY = new HtmlLength[0];

  private final int lengthType;
  private volatile int value;

  public HtmlLength(String spec) throws NumberFormatException {
    spec = spec.trim();
    final int length = spec.length();
    final char lastChar = spec.charAt(length - 1);
    String parseable;
    if (spec.endsWith("px")) {
      this.lengthType = PIXELS;
      parseable = spec.substring(0, length - 2);
    } else if (lastChar == '%') {
      this.lengthType = LENGTH;
      parseable = spec.substring(0, length - 1).trim();
    } else if (lastChar == '*') {
      this.lengthType = MULTI_LENGTH;
      if (length <= 1) {
        parseable = "1";
      } else {
        parseable = spec.substring(0, length - 1).trim();
      }
    } else {
      this.lengthType = PIXELS;
      parseable = spec;
    }
    try {
      this.value = Integer.parseInt(parseable);
    } catch (final NumberFormatException nfe) {
      this.value = (int) Double.parseDouble(parseable);
    }
  }

  public HtmlLength(final int pixels) {
    this.lengthType = PIXELS;
    this.value = pixels;
  }

  /**
   * @return Returns the lengthType.
   */
  public final int getLengthType() {
    return lengthType;
  }

  /**
   * @return Returns the spec.
   */
  public final int getRawValue() {
    return this.value;
  }

  public final int getLength(final int availLength) {
    final int lt = this.lengthType;
    if (lt == LENGTH) {
      return (availLength * this.value) / 100;
    } else {
      return this.value;
    }
  }

  public final void divideBy(final int denominator) {
    int val = this.value;
    val = val / denominator;
    this.value = val;
  }

  public final boolean isPreferredOver(final HtmlLength otherLength) {
    if (otherLength == null) {
      return true;
    }
    if (this.lengthType > otherLength.lengthType) {
      return true;
    }
    return this.value > otherLength.value;
  }
}