stringhelper.java

来自「一个OR Mapping 工具」· Java 代码 · 共 77 行

package org.dbgen.support;

/**
 * Common tasks operated on a String object.
 *
 */
public class StringHelper {

  /**
   * Escape single quote from a string.
   * @return java.lang.String
   * @param s java.lang.String
   */
  public static String escape(String s) {

    if (s == null) {
      return "";
    }

    int len = s.length();
    StringBuffer buf = new StringBuffer(len * 2);

    for (int i = 0; i < len; i++)
    {
      char c = s.charAt(i);

      if (c == '\'') {
        buf.append("''");
      } else {
        buf.append(c);
      }
    }

    return buf.toString();
  }

  /**
   * Check if a character is an alpahbet.
   * @return True if the character is an alphabet.
   * @param c The character to check.
   */
  public static boolean isAlpha(char c) {
    return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
  }

  /**
   * Check if a string is blank (either spaces, newlines, or tabs.)
   * @return True if the string is blank.
   * @param s The string to check.
   */
  public static final boolean isBlank(String s) {
    int len = s.length();

    if (len == 0)
      return true;

    for (int i = 0; i < len; i++)
    {
      char c = s.charAt(i);

      if (c != ' ' && c != '\n' && c != '\t')
        return false;
    }

    return true;
  }

  /**
   * Check if a character is a number.
   * @return True if the character is a number.
   * @param c The character to check.
   */
  public static boolean isNumeric(char c) {
    return (c >= '0' && c <= '9');
  }
}