val.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.datasources.ogc.wcs;

/**
 * Provides basic validation and conversion support.
 * @author UM
 */
public class Val {

/**
 * Converts a string to a boolean value.
 * @param s the string to convert
 * @param defaultVal the default value to return if the string is invalid
 * @return the converted value
 */
public static boolean chkBool(String s, boolean defaultVal) {
  boolean b = defaultVal;
  String  v = chkStr(s).toLowerCase();
  if (v.length() > 0) {
    if      (v.equals("true"))  b = true;
    else if (v.equals("false")) b = false;
    else if (v.equals("y"))     b = true;
    else if (v.equals("n"))     b = false;
    else if (v.equals("yes"))   b = true;
    else if (v.equals("no"))    b = false;
    else if (v.equals("on"))    b = true;
    else if (v.equals("off"))   b = false;
    else if (v.equals("0"))     b = false;
    else if (v.equals("1"))     b = true;
    else if (v.equals("-1"))    b = false;
  }
  return b;
}

/**
 * Converts a string to a double value.
 * @param s the string to convert
 * @param defaultVal the default value to return if the string is invalid
 * @return the converted value
 */
public static double chkDbl(String s, double defaultVal) {
  double n = defaultVal;
  try { n = Double.parseDouble(s.replaceAll(",",".")); }
  catch (Exception e) {n = defaultVal;}
  return n;
}

/**
 * Converts a string to an int value.
 * @param s the string to convert
 * @param defaultVal the default value to return if the string is invalid
 * @return the converted value
 */
public static int chkInt(String s, int defaultVal) {
  int n = defaultVal;
  try {n = Integer.parseInt(s);}
  catch (Exception e) {n = defaultVal;}
  return n;
}

/**
 * Converts a string to a long value.
 * @param s the string to convert
 * @param defaultVal the default value to return if the string is invalid
 * @return the converted value
 */
public static long chkLong(String s, long defaultVal) {
  long n = defaultVal;
  try {n = Long.parseLong(s);}
  catch (Exception e) {n = defaultVal;}
  return n;
}

/**
 * Check a string value.
 * @param s the string to check
 * @return the checked string (trimmed, zero length if the supplied String was null)
 */
public static String chkStr(String s) {
  if (s == null) return "";
  else return s.trim();
}

/**
 * Check a string value.
 * @param s the string to check
   @param defaultVal the default value to return if the string is null or empty
 * @return the checked string (trimmed, default value if the
 *         supplied String was null or empty)
 */
public static String chkStr(String s, String defaultVal) {
  s = chkStr(s);
  if (s.length() == 0) return defaultVal;
  else return s;
}

/**
 * Escapes single and double quotes within a string.
 * The escape character inserted is a backslash.
 * @param s the string to escape
 * @return the escaped string
 */
public static String escapeQuotes(String s) {
  if ((s == null) || (s.length() == 0)) return "";
  else {
    int nIdx1 = s.indexOf("\"");
    int nIdx2 = s.indexOf("'");
    if ((nIdx1 != -1) || (nIdx2 != -1)) {
      char c;
      StringBuffer sb = new StringBuffer(s.length()+20);
      for (int i=0; i<s.length(); i++) {
        c = s.charAt(i);
        if ((c == '\'') || (c == '"')) sb.append("\\");
        sb.append(c);
      }
      return sb.toString();
    } else return s;
  }
}

/**
 * Escapes special xml characters within a string.
 * <p> < > & " are escaped. The single quote character is not escaped.
 * @param s the string to escape
 * @return the escaped string
 */
public static String escapeXmlForBrowser(String s) {
  if ((s == null) || (s.length() == 0)) {
    return "";
  } else {
    char c;
    StringBuffer sb = new StringBuffer(s.length()+20);
    for (int i=0; i<s.length(); i++) {
      c = s.charAt(i);
      if      (c == '&')  sb.append("&amp;");
      else if (c == '<')  sb.append("&lt;");
      else if (c == '>')  sb.append("&gt;");
      else if (c == '\'') sb.append("&apos;");
      else if (c == '"')  sb.append("&quot;");
      else                sb.append(c);
    }
    return sb.toString();
  }
}
}