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+/* ************************************************************************
+
+   qooxdoo - the new era of web development
+
+   http://qooxdoo.org
+
+   Copyright:
+     2004-2007 1&1 Internet AG, Germany, http://www.1and1.org
+
+   License:
+     LGPL: http://www.gnu.org/licenses/lgpl.html
+     EPL: http://www.eclipse.org/org/documents/epl-v10.php
+     See the LICENSE file in the project's top-level directory for details.
+
+   Authors:
+     * Sebastian Werner (wpbasti)
+     * Andreas Ecker (ecker)
+
+************************************************************************ */
+
+/* ************************************************************************
+
+#module(core)
+
+************************************************************************ */
+
+/**
+ * Collection of validation methods.
+ *
+ * All methods use the strict comparison operators as all modern
+ * browsers (needs support for JavaScript 1.3) support this.
+ *
+ * http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Operators:Comparison_Operators
+ */
+qx.OO.defineClass("qx.util.Validation");
+
+/**
+ * Whether a value is valid. Invalid values are:
+ * <ul>
+ *   <li>undefined</li>
+ *   <li>null</li>
+ *   <li>"" (empty string)</li>
+ *   <li>Nan (not a number)</li>
+ *   <li>false</li>
+ * </ul>
+ * All other values are considered valid.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValid = function(v)
+{
+  switch(typeof v)
+  {
+    case "undefined":
+      return false;
+
+    case "object":
+      return v !== null;
+
+    case "string":
+      return v !== "";
+
+    case "number":
+      return !isNaN(v);
+
+    case "function":
+    case "boolean":
+      return true;
+  }
+
+  return false;
+};
+
+
+/**
+ * Whether a value is invalid. Invalid values are:
+ * <ul>
+ *   <li>undefined</li>
+ *   <li>null</li>
+ *   <li>"" (empty string)</li>
+ *   <li>Nan (not a number)</li>
+ *   <li>false</li>
+ * </ul>
+ * All other values are considered valid.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is invalid
+ */
+qx.util.Validation.isInvalid = function(v)
+{
+  switch(typeof v)
+  {
+    case "undefined":
+      return true;
+
+    case "object":
+      return v === null;
+
+    case "string":
+      return v === "";
+
+    case "number":
+      return isNaN(v);
+
+    case "function":
+    case "boolean":
+      return false;
+  }
+
+  return true;
+};
+
+
+/**
+ * Whether a value is a valid number. Valid numbers are:
+ * <ul>
+ *   <li>type is number</li>
+ *   <li>not NaN</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidNumber = function(v) {
+  return typeof v === "number" && !isNaN(v);
+};
+
+
+/**
+ * Whether a value is an invalid number.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidNumber = function(v) {
+  return typeof v !== "number" || isNaN(v);
+};
+
+
+/**
+ * Whether a value is valid string. Valid strings are:
+ * <ul>
+ *   <li>type is string</li>
+ *   <li>not an empty string</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidString = function(v) {
+  return typeof v === "string" && v !== "";
+};
+
+
+/**
+ * Whether a value is an invalid string.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidString = function(v) {
+  return typeof v !== "string" || v === "";
+};
+
+
+/**
+ * Whether a value is a valid array. Valid arrays are:
+ * <ul>
+ *   <li>type is object</li>
+ *   <li>instance is Array</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidArray = function(v) {
+  return typeof v === "object" && v !== null && v instanceof Array;
+};
+
+
+/**
+ * Whether a value is an invalid array.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidArray = function(v) {
+  return typeof v !== "object" || v === null || !(v instanceof Array);
+};
+
+
+/**
+ * Whether a value is a valid object. Valid object are:
+ * <ul>
+ *   <li>type is object</li>
+ *   <li>instance != Array</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidObject = function(v) {
+  return typeof v === "object" && v !== null && !(v instanceof Array);
+}
+
+
+/**
+ * Whether a value is an invalid object.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidObject = function(v) {
+  return typeof v !== "object" || v === null || v instanceof Array;
+};
+
+
+/**
+ * Whether a value is a valid DOM node. Valid nodes are:
+ * <ul>
+ *   <li>type is object</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidNode = function(v) {
+  return typeof v === "object" && v !== null;
+};
+
+
+/**
+ * Whether a value is an invalid node.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidNode = function(v) {
+  return typeof v !== "object" || v === null;
+};
+
+
+/**
+ * Whether a value is valid DOM element number. Valid elements are:
+ * <ul>
+ *   <li>type is object</li>
+ *   <li>v.nodeType === 1</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidElement = function(v) {
+  return typeof v === "object" && v !== null || v.nodeType !== 1;
+};
+
+
+/**
+ * Whether a value is not a DOM element.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidElement = function(v) {
+  return typeof v !== "object" || v === null || v.nodeType !== 1;
+};
+
+
+/**
+ * Whether a value is a function.
+ * <ul>
+ *   <li>type is function</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidFunction = function(v) {
+  return typeof v === "function";
+};
+
+
+/**
+ * Whether a value is not a function.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidFunction = function(v) {
+  return typeof v !== "function";
+};
+
+
+/**
+ * Whether a value is a boolean. Valid booleans are:
+ * <ul>
+ *   <li>type is boolean</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidBoolean = function(v) {
+  return typeof v === "boolean";
+};
+
+
+/**
+ * Whether a value is not boolean.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidBoolean = function(v) {
+  return typeof v !== "boolean";
+};
+
+
+/**
+ * Whether a value is valid a non empty string or a valid number. Valid values are:
+ * <ul>
+ *   <li>type is string or number</li>
+ *   <li>values is not "" or NaN</li>
+ * </ul>
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isValidStringOrNumber = function(v)
+{
+  switch(typeof v)
+  {
+    case "string":
+      return v !== "";
+
+    case "number":
+      return !isNaN(v);
+  }
+
+  return false;
+};
+
+
+/**
+ * Whether a value not a valid string or number.
+ *
+ * @param v {var} the value to validate.
+ * @return {Boolean} whether the variable is valid
+ */
+qx.util.Validation.isInvalidStringOrNumber = function(v)
+{
+  switch(typeof v)
+  {
+    case "string":
+      return v === "";
+
+    case "number":
+      return isNaN(v);
+  }
+
+  return false;
+};