[Jvalid-checkins] CVS: jvalid/src/net/sourceforge/jvalid Validator.java,1.3,1.4

SourceForge Headquarters 1320 Columbia Street Suite 310 San Diego, CA 92101 +1 (858) 422-6466

Update of /cvsroot/jvalid/jvalid/src/net/sourceforge/jvalid
In directory usw-pr-cvs1:/tmp/cvs-serv24200

Modified Files:
	Validator.java 
Log Message:
Updated JavaDoc comments on checkValidation().

Index: Validator.java
===================================================================
RCS file: /cvsroot/jvalid/jvalid/src/net/sourceforge/jvalid/Validator.java,v
retrieving revision 1.3
retrieving revision 1.4
diff -C2 -r1.3 -r1.4
*** Validator.java	2001/03/02 03:46:15	1.3
--- Validator.java	2001/03/22 11:24:15	1.4
***************
*** 1,406 ****
! /*------------------------------------------------------------------------------------------
!  * First let me give credit where credit is due!
!  *
!  * This package is based on the orginal work of Brett McLaughlin in the Javaworld article
!  * 'Validation with Java and XML schema, Part 1' which can be found at
!  * http://www.javaworld.com/javaworld/jw-09-2000/jw-0908-validation.html
!  *
!  *
!  * Major modifications are noted in the class JavaDoc comment or in the CVS change log.
!  *------------------------------------------------------------------------------------------
!  *
!  * Legal Stuff
!  *
!  * JValid is Open Source.
!  *
!  * Copyright (c) 2000 Mike Williams.  All rights reserved.
!  *
!  * Redistribution and use in source and binary forms, with or without
!  * modification, are permitted under the terms of the 
!  * GNU LESSER GENERAL PUBLIC LICENSE version 2.1 or later.
!  * 
!  * You should have received a copy the license in this distribution.
!  *
!  * This product includes software developed by the JDOM Project
!  * (http://www.jdom.org).  Please see LICENSE-JDOM for details.
!  *
!  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
!  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
!  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
!  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,
!  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
!  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
!  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
!  * IN CONTRACT, STRICT LIABILITY, OR TORT
!  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
!  * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
!  * DAMAGE.
!  *
!  *-------------------------------------------------------------------
!  * C H A N G E  L O G
!  *-------------------------------------------------------------------
!  * $Header$
   * $Log$
   * Revision 1.3  2001/03/02 03:46:15  mikewill_1998
   * Added support for date validation.
!  *
!  * Revision 1.2  2001/02/25 17:42:18  mikewill_1998
!  * Updated JavaDoc comments.
!  * Added acknowledgements for JDOM and Apache.
!  *
!  * Revision 1.1.1.1  2001/02/22 11:30:33  mikewill_1998
!  * Initial Import
!  *
!  */
! 
! package net.sourceforge.jvalid;
! 
! import java.io.IOException;
! import java.net.URL;
! import java.util.HashMap;
! import java.util.Iterator;
! import java.util.List;
! import java.util.Map;
! import java.util.Date;
! import java.util.LinkedList;
! import java.text.DateFormat;
! import java.text.ParseException;
! import java.util.Iterator;
! 
! import net.sourceforge.jvalid.UnsupportedDataTypeException;
! 
! /**
!  * <p>
!  *  The <code>Validator</code> class allows an application component or client to
!  *    provide data, and determine if the data is valid for the requested type.
!  * </p>
!  *
!  * @author Mike Williams
!  */
! public class Validator
! {
! 
!     /** The instances of this class for use (singleton design pattern) */
!     private static Map instances = null;
! 
!     /** The URL of the XML Schema for this <code>Validator</code> */
!     private URL schemaURL;
! 
!     /** The constraints for this XML Schema */
!     private Map constraints;
! 
!     /**
!      * <p>
!      *  This constructor is private so that the class cannot be instantiated
!      *    directly, but instead only through <code>{@link #getInstance()}</code>.
!      * </p>
!      *
!      * @param schemaURL <code>URL</code> to parse the schema at.
!      * @throws <code>IOException</code> - when errors in parsing occur.
!      */
!     private Validator(URL schemaURL) throws IOException
!     {
!         this.schemaURL = schemaURL;
! 
!         // parse the XML Schema and create the constraints
!         SchemaParser parser = new SchemaParser(schemaURL);
!         constraints = parser.getConstraints();
!     }
! 
!     /**
!      * <p>
!      *  This will return the instance for the specific XML Schema URL. If a schema
!      *    exists, it is returned (as parsing will already be done); otherwise,
!      *    a new instance is created, and then returned.
!      * </p>
!      *
!      * @param schemaURL <code>URL</code> of schema to validate against.
!      * @return <code>Validator</code> - the instance, ready to use.
!      * @throws <code>IOException</code> - when errors in parsing occur.
!      */
!     public static synchronized Validator getInstance(URL schemaURL) 
!         throws IOException
!     {
! 
!         if (instances != null)
!         {
!             if (instances.containsKey(schemaURL.toString()))
!             {
!                 return (Validator)instances.get(schemaURL.toString());
!             }
!             else
!             {
!                 Validator validator = new Validator(schemaURL);
!                 instances.put(schemaURL.toString(), validator);
!                 return validator;
!             }
!         }
!         else
!         {
!             instances = new HashMap();
!             Validator validator = new Validator(schemaURL);
!             instances.put(schemaURL.toString(), validator);
!             return validator;
!         }
!     }
! 
!     /**
!      * <p>
!      *  This will validate a data value (in <code>String</code> format) against a 
!      *    specific constraint, and return an error message if there is a problem.
!      * </p>
!      * <p>
!      * <i>Note: </i> The signature of this method has changed.  The orginal
!      * code returned a string.
!      * </p>
!      * @param constraintName the identifier in the constraints to validate this data against.
!      * @param data <code>String</code> data to validate.
!      * @return <code>List</code> - Error message, or an empty String if no problems occurred.
!      */
!     public List checkValidity(String constraintName, String data)
!     {
!         StringBuffer errorMessage = new StringBuffer();
!         LinkedList errorList = new LinkedList();
! 
!         // Validate against the correct constraint
!         Object o = constraints.get(constraintName);
! 
!         // If no constraint, then everything is valid
!         if (o == null)
!         {
!             return errorList;
!         }
!         
!         Constraint constraint = (Constraint)o;
! 
!         // Validate data type
!         if (!correctDataType(data, constraint.getDataType()))
!         {
!             errorMessage.append("The value supplied, ")
!                         .append(data)
!                         .append(" cannot be converted to the required type, ")
!                         .append(constraint.getDataType());
!             errorList.add( errorMessage.toString() );
!         }
!         
!         errorMessage.delete( 0, errorMessage.length() );
!         
!         // Validate against allowed values
!         if (constraint.hasAllowedValues())
!         {
!             List allowedValues = constraint.getAllowedValues();
!             if (!allowedValues.contains(data))
!             {
!                 errorMessage.append("The value supplied, ")
!                             .append(data)
!                             .append(" is not in the allowed set of data types (");
!                 
!                 for (Iterator i = allowedValues.iterator(); i.hasNext(); )
!                 {
!                     errorMessage.append("'")
!                                 .append((String)i.next())
!                                 .append("', ");
!                 }
!                 
!                 errorMessage.setLength(errorMessage.length() - 2);
!                 errorMessage.append(")");
!                 errorList.add( errorMessage.toString() );
!             }
!         }
!         
!         errorMessage.delete( 0, errorMessage.length() );
! 
!         // Validate against range specifications
!         try
!         {
!             double doubleValue = DataConverter.toDouble( data, constraint.getDataType() );
!             
!             if (constraint.hasMinExclusive())
!             {
!                 if (doubleValue <= constraint.getMinExclusive())
!                 {
!                     errorMessage.append("The value supplied, ")
!                                 .append(data)
!                                 .append(" is less than or equal to the allowed minimum value, ")
!                                 .append(constraint.getMinExclusiveString());
!                     errorList.add( errorMessage.toString() );
!                 }
!             }
!             
!             errorMessage.delete( 0, errorMessage.length() );
!             
!             if (constraint.hasMinInclusive())
!             {
!                 if (doubleValue < constraint.getMinInclusive())
!                 {
!                     errorMessage.append("The value supplied, ")
!                                 .append(data)
!                                 .append(" is less than the allowed minimum value, ")
!                                 .append(constraint.getMinInclusiveString());
!                     errorList.add( errorMessage.toString() );
!                 }
!             }
!             
!             errorMessage.delete( 0, errorMessage.length() );
!             
!             if (constraint.hasMaxExclusive())
!             {
!                 if (doubleValue >= constraint.getMaxExclusive())
!                 {
!                     errorMessage.append("The value supplied, ")
!                                 .append(data)
!                                 .append(" is greater than or equal to the allowed maximum value, ")
!                                 .append(constraint.getMaxExclusiveString());
!                     errorList.add( errorMessage.toString() );
!                 }
!             }
!             
!             errorMessage.delete( 0, errorMessage.length() );
!             
!             if (constraint.hasMaxInclusive())
!             {
!                 if (doubleValue > constraint.getMaxInclusive())
!                 {
!                     errorMessage.append("The value supplied, ")
!                                 .append(data)
!                                 .append(" is greater than the allowed maximum value, ")
!                                 .append(constraint.getMaxInclusiveString());
!                     errorList.add( errorMessage.toString() );
!                 }
!             }
!         }
!         catch (UnsupportedDataTypeException e)
!         {
!             
!         }
!  
!         // Return any errors found
!         return errorList;
!     }
! 
!     /**
!      * <p>
!      *  This will test the supplied data to see if it can be converted to the
!      *    Java data type given in <code>dataType</code>.
!      * </p>
!      * 
!      * @param data <code>String</code> to test data type of.
!      * @param dataType <code>String</code> name of Java class to convert to.
!      * @return <code>boolean</code> - whether conversion can occur.
!      */
!     private boolean correctDataType(String data, String dataType)
!     {
!         if ((dataType.equals("String")) || (dataType.equals("java.lang.String")))
!         {
!             return true;
!         }
! 
!         if ((dataType.equals("int")) || (dataType.equals("java.lang.Integer")))
!         {
!             try
!             {
!                 Integer test = new Integer(data);
!                 return true;
!             }
!             catch (NumberFormatException e)
!             {
!                 return false;
!             }
!         }
!         
!         if ((dataType.equals("long")) || (dataType.equals("java.lang.Long")))
!         {
!             try
!             {
!                 Long test = new Long(data);
!                 return true;
!             }
!             catch (NumberFormatException e)
!             {
!                 return false;
!             }
!         }
!         
!         if ((dataType.equals("float")) || (dataType.equals("java.lang.Float")))
!         {
!             try
!             {
!                 Float test = new Float(data);
!                 return true;
!             }
!             catch (NumberFormatException e)
!             {
!                 return false;
!             }
!         }
!         
!         if ((dataType.equals("double")) || (dataType.equals("java.lang.Double")))
!         {
!             try
!             {
!                 Double test = new Double(data);
!                 return true;
!             }
!             catch (NumberFormatException e)
!             {
!                 return false;
!             }
!         }
!         
!         if (dataType.equals("java.lang.Boolean"))
!         {
!             if ((data.equalsIgnoreCase("true")) ||
!                 (data.equalsIgnoreCase("false")) ||
!                 (data.equalsIgnoreCase("yes")) ||
!                 (data.equalsIgnoreCase("no")))
!             {
!                 return true;
!             }
!             else
!             {
!                 return false;
!             }
!         }
! 
!         // Check for date.
!         if ( dataType.equals ( "date" ) || dataType.equals( "java.lang.Date" ) )
!         {
!             try
!             {
!                 DateFormat df = DateFormat.getDateInstance( DateFormat.SHORT );
!                 df.setLenient( false );
!                 Date date = df.parse( data );
!             }
!             catch ( ParseException pe )
!             {
!                 return false;
!             }
!         }
!         
!         return true;
!     }
! 
!     /**
!      * Basically clears the instances hashmap.<br>
!      * The idea is that if you want to force schemas to be reloaded you can 
!      * call this method.  This will force the next call to getInstance() to 
!      * reload the schema.
!      */
!     public static synchronized void unload()
!     {
!         if ( instances != null &&
!              instances.size() > 0 )
!         {
!             Iterator i = instances.values().iterator();
!             while ( i.hasNext() )
!             {
!                 i.remove();
!             }
!         }
!         
!         instances.clear();
!         instances = null;
!     }
!     
  }
--- 1,409 ----
! /*------------------------------------------------------------------------------------------
!  * First let me give credit where credit is due!
!  *
!  * This package is based on the orginal work of Brett McLaughlin in the Javaworld article
!  * 'Validation with Java and XML schema, Part 1' which can be found at
!  * http://www.javaworld.com/javaworld/jw-09-2000/jw-0908-validation.html
!  *
!  *
!  * Major modifications are noted in the class JavaDoc comment or in the CVS change log.
!  *------------------------------------------------------------------------------------------
!  *
!  * Legal Stuff
!  *
!  * JValid is Open Source.
!  *
!  * Copyright (c) 2000 Mike Williams.  All rights reserved.
!  *
!  * Redistribution and use in source and binary forms, with or without
!  * modification, are permitted under the terms of the 
!  * GNU LESSER GENERAL PUBLIC LICENSE version 2.1 or later.
!  * 
!  * You should have received a copy the license in this distribution.
!  *
!  * This product includes software developed by the JDOM Project
!  * (http://www.jdom.org).  Please see LICENSE-JDOM for details.
!  *
!  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
!  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
!  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
!  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT,
!  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
!  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
!  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
!  * IN CONTRACT, STRICT LIABILITY, OR TORT
!  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
!  * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
!  * DAMAGE.
!  *
!  *-------------------------------------------------------------------
!  * C H A N G E  L O G
!  *-------------------------------------------------------------------
!  * $Header$
   * $Log$
+  * Revision 1.4  2001/03/22 11:24:15  mikewill_1998
+  * Updated JavaDoc comments on checkValidation().
+  *
   * Revision 1.3  2001/03/02 03:46:15  mikewill_1998
   * Added support for date validation.
!  *
!  * Revision 1.2  2001/02/25 17:42:18  mikewill_1998
!  * Updated JavaDoc comments.
!  * Added acknowledgements for JDOM and Apache.
!  *
!  * Revision 1.1.1.1  2001/02/22 11:30:33  mikewill_1998
!  * Initial Import
!  *
!  */
! 
! package net.sourceforge.jvalid;
! 
! import java.io.IOException;
! import java.net.URL;
! import java.util.HashMap;
! import java.util.Iterator;
! import java.util.List;
! import java.util.Map;
! import java.util.Date;
! import java.util.LinkedList;
! import java.text.DateFormat;
! import java.text.ParseException;
! import java.util.Iterator;
! 
! import net.sourceforge.jvalid.UnsupportedDataTypeException;
! 
! /**
!  * <p>
!  *  The <code>Validator</code> class allows an application component or client to
!  *    provide data, and determine if the data is valid for the requested type.
!  * </p>
!  *
!  * @author Mike Williams
!  */
! public class Validator
! {
! 
!     /** The instances of this class for use (singleton design pattern) */
!     private static Map instances = null;
! 
!     /** The URL of the XML Schema for this <code>Validator</code> */
!     private URL schemaURL;
! 
!     /** The constraints for this XML Schema */
!     private Map constraints;
! 
!     /**
!      * <p>
!      *  This constructor is private so that the class cannot be instantiated
!      *    directly, but instead only through <code>{@link #getInstance()}</code>.
!      * </p>
!      *
!      * @param schemaURL <code>URL</code> to parse the schema at.
!      * @throws <code>IOException</code> - when errors in parsing occur.
!      */
!     private Validator(URL schemaURL) throws IOException
!     {
!         this.schemaURL = schemaURL;
! 
!         // parse the XML Schema and create the constraints
!         SchemaParser parser = new SchemaParser(schemaURL);
!         constraints = parser.getConstraints();
!     }
! 
!     /**
!      * <p>
!      *  This will return the instance for the specific XML Schema URL. If a schema
!      *    exists, it is returned (as parsing will already be done); otherwise,
!      *    a new instance is created, and then returned.
!      * </p>
!      *
!      * @param schemaURL <code>URL</code> of schema to validate against.
!      * @return <code>Validator</code> - the instance, ready to use.
!      * @throws <code>IOException</code> - when errors in parsing occur.
!      */
!     public static synchronized Validator getInstance(URL schemaURL) 
!         throws IOException
!     {
! 
!         if (instances != null)
!         {
!             if (instances.containsKey(schemaURL.toString()))
!             {
!                 return (Validator)instances.get(schemaURL.toString());
!             }
!             else
!             {
!                 Validator validator = new Validator(schemaURL);
!                 instances.put(schemaURL.toString(), validator);
!                 return validator;
!             }
!         }
!         else
!         {
!             instances = new HashMap();
!             Validator validator = new Validator(schemaURL);
!             instances.put(schemaURL.toString(), validator);
!             return validator;
!         }
!     }
! 
!     /**
!      * <p>
!      *  This will validate a data value (in <code>String</code> format) against a 
!      *    specific constraint, and return a List containing any errors if there is a problem.
!      * </p>
!      * <p>
!      * <i>Note: </i> The signature of this method has changed.  The orginal
!      * code returned a string.
!      * </p>
!      * @param constraintName the identifier in the constraints to validate this data against.
!      * @param data <code>String</code> data to validate.
!      * @return <code>List</code> - A List of error messages, or an empty List if no problems occurred.
!      */
!     public List checkValidity(String constraintName, String data)
!     {
!         StringBuffer errorMessage = new StringBuffer();
!         LinkedList errorList = new LinkedList();
! 
!         // Validate against the correct constraint
!         Object o = constraints.get(constraintName);
! 
!         // If no constraint, then everything is valid
!         if (o == null)
!         {
!             return errorList;
!         }
!         
!         Constraint constraint = (Constraint)o;
! 
!         // Validate data type
!         if (!correctDataType(data, constraint.getDataType()))
!         {
!             errorMessage.append("The value supplied, ")
!                         .append(data)
!                         .append(" cannot be converted to the required type, ")
!                         .append(constraint.getDataType());
!             errorList.add( errorMessage.toString() );
!         }
!         
!         errorMessage.delete( 0, errorMessage.length() );
!         
!         // Validate against allowed values
!         if (constraint.hasAllowedValues())
!         {
!             List allowedValues = constraint.getAllowedValues();
!             if (!allowedValues.contains(data))
!             {
!                 errorMessage.append("The value supplied, ")
!                             .append(data)
!                             .append(" is not in the allowed set of data types (");
!                 
!                 for (Iterator i = allowedValues.iterator(); i.hasNext(); )
!                 {
!                     errorMessage.append("'")
!                                 .append((String)i.next())
!                                 .append("', ");
!                 }
!                 
!                 errorMessage.setLength(errorMessage.length() - 2);
!                 errorMessage.append(")");
!                 errorList.add( errorMessage.toString() );
!             }
!         }
!         
!         errorMessage.delete( 0, errorMessage.length() );
! 
!         // Validate against range specifications
!         try
!         {
!             double doubleValue = DataConverter.toDouble( data, constraint.getDataType() );
!             
!             if (constraint.hasMinExclusive())
!             {
!                 if (doubleValue <= constraint.getMinExclusive())
!                 {
!                     errorMessage.append("The value supplied, ")
!                                 .append(data)
!                                 .append(" is less than or equal to the allowed minimum value, ")
!                                 .append(constraint.getMinExclusiveString());
!                     errorList.add( errorMessage.toString() );
!                 }
!             }
!             
!             errorMessage.delete( 0, errorMessage.length() );
!             
!             if (constraint.hasMinInclusive())
!             {
!                 if (doubleValue < constraint.getMinInclusive())
!                 {
!                     errorMessage.append("The value supplied, ")
!                                 .append(data)
!                                 .append(" is less than the allowed minimum value, ")
!                                 .append(constraint.getMinInclusiveString());
!                     errorList.add( errorMessage.toString() );
!                 }
!             }
!             
!             errorMessage.delete( 0, errorMessage.length() );
!             
!             if (constraint.hasMaxExclusive())
!             {
!                 if (doubleValue >= constraint.getMaxExclusive())
!                 {
!                     errorMessage.append("The value supplied, ")
!                                 .append(data)
!                                 .append(" is greater than or equal to the allowed maximum value, ")
!                                 .append(constraint.getMaxExclusiveString());
!                     errorList.add( errorMessage.toString() );
!                 }
!             }
!             
!             errorMessage.delete( 0, errorMessage.length() );
!             
!             if (constraint.hasMaxInclusive())
!             {
!                 if (doubleValue > constraint.getMaxInclusive())
!                 {
!                     errorMessage.append("The value supplied, ")
!                                 .append(data)
!                                 .append(" is greater than the allowed maximum value, ")
!                                 .append(constraint.getMaxInclusiveString());
!                     errorList.add( errorMessage.toString() );
!                 }
!             }
!         }
!         catch (UnsupportedDataTypeException e)
!         {
!             
!         }
!  
!         // Return any errors found
!         return errorList;
!     }
! 
!     /**
!      * <p>
!      *  This will test the supplied data to see if it can be converted to the
!      *    Java data type given in <code>dataType</code>.
!      * </p>
!      * 
!      * @param data <code>String</code> to test data type of.
!      * @param dataType <code>String</code> name of Java class to convert to.
!      * @return <code>boolean</code> - whether conversion can occur.
!      */
!     private boolean correctDataType(String data, String dataType)
!     {
!         if ((dataType.equals("String")) || (dataType.equals("java.lang.String")))
!         {
!             return true;
!         }
! 
!         if ((dataType.equals("int")) || (dataType.equals("java.lang.Integer")))
!         {
!             try
!             {
!                 Integer test = new Integer(data);
!                 return true;
!             }
!             catch (NumberFormatException e)
!             {
!                 return false;
!             }
!         }
!         
!         if ((dataType.equals("long")) || (dataType.equals("java.lang.Long")))
!         {
!             try
!             {
!                 Long test = new Long(data);
!                 return true;
!             }
!             catch (NumberFormatException e)
!             {
!                 return false;
!             }
!         }
!         
!         if ((dataType.equals("float")) || (dataType.equals("java.lang.Float")))
!         {
!             try
!             {
!                 Float test = new Float(data);
!                 return true;
!             }
!             catch (NumberFormatException e)
!             {
!                 return false;
!             }
!         }
!         
!         if ((dataType.equals("double")) || (dataType.equals("java.lang.Double")))
!         {
!             try
!             {
!                 Double test = new Double(data);
!                 return true;
!             }
!             catch (NumberFormatException e)
!             {
!                 return false;
!             }
!         }
!         
!         if (dataType.equals("java.lang.Boolean"))
!         {
!             if ((data.equalsIgnoreCase("true")) ||
!                 (data.equalsIgnoreCase("false")) ||
!                 (data.equalsIgnoreCase("yes")) ||
!                 (data.equalsIgnoreCase("no")))
!             {
!                 return true;
!             }
!             else
!             {
!                 return false;
!             }
!         }
! 
!         // Check for date.
!         if ( dataType.equals ( "date" ) || dataType.equals( "java.lang.Date" ) )
!         {
!             try
!             {
!                 DateFormat df = DateFormat.getDateInstance( DateFormat.SHORT );
!                 df.setLenient( false );
!                 Date date = df.parse( data );
!             }
!             catch ( ParseException pe )
!             {
!                 return false;
!             }
!         }
!         
!         return true;
!     }
! 
!     /**
!      * Basically clears the instances hashmap.<br>
!      * The idea is that if you want to force schemas to be reloaded you can 
!      * call this method.  This will force the next call to getInstance() to 
!      * reload the schema.
!      */
!     public static synchronized void unload()
!     {
!         if ( instances != null &&
!              instances.size() > 0 )
!         {
!             Iterator i = instances.values().iterator();
!             while ( i.hasNext() )
!             {
!                 i.remove();
!             }
!         }
!         
!         instances.clear();
!         instances = null;
!     }
!     
  }