stringwrapper.java

MoMEUnit是一个单元测试的J2ME的应用程序xUnit架构实例。这是来自JUnit框架

package mome.ext;

import java.util.Enumeration;

import javax.microedition.lcdui.Font;

/**
 * @author Sergio Morozov
 * @version 0.2
 */
public class StringWrapper implements Enumeration
{

  private int width;

  private Font font = Font.getDefaultFont();

  private boolean truncate = false;

  private char[] src;

  private int srcLength;

  private int pos = 0;

  private int l2 = 0;

  /*
   * (non-Javadoc)
   * 
   * @see java.util.Enumeration#hasMoreElements()
   */

  public StringWrapper(int width)
  {
    this(width, null);
  }

  public StringWrapper(int width, Font font)
  {
    this(width, font, false);
  }

  public StringWrapper(int width, Font font, String str)
  {
    this(width, font, str, false);
  }

  public StringWrapper(int width, boolean truncate)
  {
    this(width, null, truncate);
  }

  public StringWrapper(int width, Font font, boolean truncate)
  {
    this.setFont(font);
    this.setWidth(width);
    this.setTruncate(truncate);
  }

  public StringWrapper(int width, Font font, String str, boolean truncate)
  {
    this(width, font, truncate);
    this.setString(str);
  }

  public void restart()
  {
    this.pos = 0;
    if (this.src != null)
    {
      this.l2 = font.charsWidth(this.src, 0, this.srcLength) - this.width;
    } else this.srcLength = 0;
  }

  /**
   * @return the font
   * @since 0.2
   */
  public Font getFont()
  {
    return this.font;
  }

  /**
   * @param font
   *          the font to set
   * @since 0.2
   */
  public void setFont(Font font)
  {
    this.font = font == null ? Font.getDefaultFont() : font;
  }

  public void setWidth(int width)
  {
    if (width <= 0) throw new IllegalArgumentException("width not >= 0: "
        + width);
    this.width = width;
    this.restart();
  }

  public int getWidth()
  {
    return this.width;
  }

  public void setString(String str)
  {
    if (str == null) throw new NullPointerException("str");
    this.srcLength = str.length();
    this.src = str.toCharArray();
    this.restart();
  }

  public String getString()
  {
    return String.valueOf(this.src);
  }

  /**
   * @return the truncate
   * @since 0.2
   */
  public boolean isTruncate()
  {
    return this.truncate;
  }

  /**
   * @param truncate
   *          the truncate to set
   * @since 0.2
   */
  public void setTruncate(boolean truncate)
  {
    this.truncate = truncate;
    this.restart();
  }

  public boolean hasMoreElements()
  {
    return pos < srcLength;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.util.Enumeration#nextElement()
   */
  public Object nextElement()
  {
    String res = null;
    if (this.pos < this.srcLength)
    {
      int i = (this.srcLength * this.width + pos * l2) / (this.width + l2) + 1;
      if (i > this.srcLength) i = this.srcLength;
      int l = font.charsWidth(this.src, pos, i - pos) - this.width;
      if (i < this.srcLength)
      {
        if (l > 0)
        {
          while (i > 0 && (l -= font.charWidth(this.src[i--])) > 0);
        } else
        {
          while (i < this.srcLength
              && (l += font.charWidth(this.src[i++])) <= 0);
          if (l > 0) l -= font.charWidth(this.src[i--]);
        }
        l2 -= this.width + l;
      }
      res = String.valueOf(src, this.pos, i - this.pos);
      this.pos = this.truncate ? this.srcLength : i;
    }
    return res;
  }
}