Source code: org/apache/commons/el/Coercions.java

   /*
    * The Apache Software License, Version 1.1
    *
    * Copyright (c) 1999 The Apache Software Foundation.  All rights 
    * reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer. 
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:  
   *       "This product includes software developed by the 
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written 
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * 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 APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS 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
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   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */ 
  
  package org.apache.commons.el;
  
  import java.beans.PropertyEditor;
  import java.beans.PropertyEditorManager;
  import java.math.BigInteger;
  import java.math.BigDecimal;
  import javax.servlet.jsp.el.ELException;
  
  /**
   *
   * <p>This class contains the logic for coercing data types before
   * operators are applied to them.
   *
   * <p>The following is the list of rules applied for various type
   * conversions.
   *
   * <ul><pre>
   * Applying arithmetic operator
   *   Binary operator - A {+,-,*} B
   *     if A and B are null
   *       return 0
   *     if A or B is BigDecimal, coerce both to BigDecimal and then:
   *       if operator is +, return <code>A.add(B)</code>
   *       if operator is -, return <code>A.subtract(B)</code>
   *       if operator is *, return <code>A.multiply(B)</code>
   *     if A or B is Float, Double, or String containing ".", "e", or "E"
   *       if A or B is BigInteger, coerce both A and B to BigDecimal and apply operator
   *       coerce both A and B to Double and apply operator
   *     if A or B is BigInteger, coerce both to BigInteger and then:
   *       if operator is +, return <code>A.add(B)</code>
   *       if operator is -, return <code>A.subtract(B)</code>
   *       if operator is *, return <code>A.multiply(B)</code>
   *     otherwise
   *       coerce both A and B to Long
   *       apply operator
   *     if operator results in exception (such as divide by 0), error
   * 
   *   Binary operator - A {/,div} B
   *     if A and B are null
   *       return 0
   *     if A or B is a BigDecimal or BigInteger, coerce both to BigDecimal and
   *      return <code>A.divide(B, BigDecimal.ROUND_HALF_UP)</code>
   *     otherwise
   *       coerce both A and B to Double
  *       apply operator
  *     if operator results in exception (such as divide by 0), error
  * 
  *   Binary operator - A {%,mod} B
  *     if A and B are null
  *       return 0
  *     if A or B is BigDecimal, Float, Double, or String containing ".", "e" or "E"
  *       coerce both to Double
  *       apply operator
  *     if A or B is BigInteger, coerce both to BigInteger and return
  *      <code>A.remainder(B)</code>
  *     otherwise
  *       coerce both A and B to Long
  *       apply operator
  *     if operator results in exception (such as divide by 0), error
  * 
  *   Unary minus operator - -A
  *     if A is null
  *       return 0
  *     if A is BigInteger or BigDecimal, return <code>A.negate()</code>
  *     if A is String
  *       if A contains ".", "e", or "E"
  *         coerce to Double, apply operator
  *       otherwise
  *         coerce to a Long and apply operator
  *     if A is Byte,Short,Integer,Long,Float,Double
  *       retain type, apply operator
  *     if operator results in exception, error
  *     otherwise
  *       error
  *
  * Applying "empty" operator - empty A
  *   if A is null
  *     return true
  *   if A is zero-length String
  *     return true
  *   if A is zero-length array
  *     return true
  *   if A is List and ((List) A).isEmpty()
  *     return true
  *   if A is Map and ((Map) A).isEmpty()
  *     return true
  *   if A is Collection an ((Collection) A).isEmpty()
  *     return true
  *   otherwise
  *     return false
  * 
  * Applying logical operators
  *   Binary operator - A {and,or} B
  *     coerce both A and B to Boolean, apply operator
  *   NOTE - operator stops as soon as expression can be determined, i.e.,
  *     A and B and C and D - if B is false, then only A and B is evaluated
  *   Unary not operator - not A
  *     coerce A to Boolean, apply operator
  * 
  * Applying relational operator
  *   A {<,>,<=,>=,lt,gt,lte,gte} B
  *     if A==B
  *       if operator is >= or <=
  *         return true
  *       otherwise
  *         return false
  *     if A or B is null
  *       return false
  *     if A or B is BigDecimal, coerce both A and B to BigDecimal and use the
  *      return value of <code>A.compareTo(B)</code>
  *     if A or B is Float or Double
  *       coerce both A and B to Double
  *       apply operator
  *     if A or B is BigInteger, coerce both A and B to BigInteger and use the
  *      return value of <code>A.compareTo(B)</code>
  *     if A or B is Byte,Short,Character,Integer,Long
  *       coerce both A and B to Long
  *       apply operator
  *     if A or B is String
  *       coerce both A and B to String, compare lexically
  *     if A is Comparable
  *       if A.compareTo (B) throws exception
  *         error
  *       otherwise
  *         use result of A.compareTo(B)
  *     if B is Comparable
  *       if B.compareTo (A) throws exception
  *         error
  *       otherwise
  *         use result of B.compareTo(A)
  *     otherwise
  *       error
  * 
  * Applying equality operator
  *   A {==,!=} B
  *     if A==B
  *       apply operator
  *     if A or B is null
  *       return false for ==, true for !=
  *     if A or B is BigDecimal, coerce both A and B to BigDecimal and then:
  *       if operator is == or eq, return <code>A.equals(B)</code>
  *       if operator is != or ne, return <code>!A.equals(B)</code>
  *     if A or B is Float or Double
  *       coerce both A and B to Double
  *       apply operator
  *     if A or B is BigInteger, coerce both A and B to BigInteger and then:
  *       if operator is == or eq, return <code>A.equals(B)</code>
  *       if operator is != or ne, return <code>!A.equals(B)</code>
  *     if A or B is Byte,Short,Character,Integer,Long
  *       coerce both A and B to Long
  *       apply operator
  *     if A or B is Boolean
  *       coerce both A and B to Boolean
  *       apply operator
  *     if A or B is String
  *       coerce both A and B to String, compare lexically
  *     otherwise
  *       if an error occurs while calling A.equals(B)
  *         error
  *       apply operator to result of A.equals(B)
  * 
  * coercions
  * 
  *   coerce A to String
  *     A is String
  *       return A
  *     A is null
  *       return ""
  *     A.toString throws exception
  *       error
  *     otherwise
  *       return A.toString
  * 
  *   coerce A to Number type N
  *     A is null or ""
  *       return 0
  *     A is Character
  *       convert to short, apply following rules
  *     A is Boolean
  *       error
  *     A is Number type N
  *       return A
  *     A is Number, coerce quietly to type N using the following algorithm
  *         If N is BigInteger
  *             If A is BigDecimal, return <code>A.toBigInteger()</code>
  *             Otherwise, return <code>BigInteger.valueOf(A.longValue())</code>
  *        if N is BigDecimal
  *             If A is a BigInteger, return <code>new BigDecimal(A)</code>
  *             Otherwise, return <code>new BigDecimal(A.doubleValue())</code>
  *        If N is Byte, return <code>new Byte(A.byteValue())</code>
  *        If N is Short, return <code>new Short(A.shortValue())</code>
  *        If N is Integer, return <code>new Integer(A.integerValue())</code>
  *        If N is Long, return <code>new Long(A.longValue())</code>
  *        If N is Float, return <code>new Float(A.floatValue())</code>
  *        If N is Double, return <code>new Double(A.doubleValue())</code>
  *        otherwise ERROR
  *     A is String
  *       If N is BigDecimal then:
  *            If <code>new BigDecimal(A)</code> throws an exception then ERROR
  *            Otherwise, return <code>new BigDecimal(A)</code>
  *       If N is BigInteger then:
  *            If <code>new BigInteger(A)</code> throws an exception, then ERROR
  *            Otherwise, return <code>new BigInteger(A)</code>
  *       new <code>N.valueOf(A)</code> throws exception
  *         error
  *       return <code>N.valueOf(A)</code>
  *     otherwise
  *       error
  * 
  *   coerce A to Character should be
  *     A is null or ""
  *       return (char) 0
  *     A is Character
  *       return A
  *     A is Boolean
  *       error
  *     A is Number with less precision than short
  *       coerce quietly - return (char) A
  *     A is Number with greater precision than short
  *       coerce quietly - return (char) A
  *     A is String
  *       return A.charAt (0)
  *     otherwise
  *       error
  * 
  *   coerce A to Boolean
  *     A is null or ""
  *       return false
  *     A is Boolean
  *       return A
  *     A is String
  *       Boolean.valueOf(A) throws exception
  *         error
  *       return Boolean.valueOf(A)
  *     otherwise
  *       error
  * 
  *   coerce A to any other type T
  *     A is null
  *       return null
  *     A is assignable to T
  *       coerce quietly
  *     A is String
  *       T has no PropertyEditor
  *         if A is "", return null
  *         otherwise error
  *       T's PropertyEditor throws exception
  *         if A is "", return null
  *         otherwise error
  *       otherwise
  *         apply T's PropertyEditor
  *     otherwise
  *       error
  * </pre></ul>
  *
  * @author Nathan Abramson - Art Technology Group
  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
  **/
 
 public class Coercions
 {
    private static final Number ZERO = new Integer(0);
   //-------------------------------------
   /**
    *
    * Coerces the given value to the specified class.
    **/
   public static Object coerce (Object pValue,
              Class pClass,
              Logger pLogger)
     throws ELException
   {
     if (pClass == String.class) {
       return coerceToString (pValue, pLogger);
     }
     else if (isNumberClass (pClass)) {
       return coerceToPrimitiveNumber (pValue, pClass, pLogger);
     }
     else if (pClass == Character.class ||
        pClass == Character.TYPE) {
       return coerceToCharacter (pValue, pLogger);
     }
     else if (pClass == Boolean.class ||
        pClass == Boolean.TYPE) {
       return coerceToBoolean (pValue, pLogger);
     }
     else {
       return coerceToObject (pValue, pClass, pLogger);
     }
   }
 
   //-------------------------------------
   /**
    *
    * Returns true if the given class is Byte, Short, Integer, Long,
    * Float, Double, BigInteger, or BigDecimal
    **/
   static boolean isNumberClass (Class pClass)
   {
     return
       pClass == Byte.class ||
       pClass == Byte.TYPE ||
       pClass == Short.class ||
       pClass == Short.TYPE ||
       pClass == Integer.class ||
       pClass == Integer.TYPE ||
       pClass == Long.class ||
       pClass == Long.TYPE ||
       pClass == Float.class ||
       pClass == Float.TYPE ||
       pClass == Double.class ||
       pClass == Double.TYPE ||
       pClass == BigInteger.class ||
       pClass == BigDecimal.class;
   }
 
   //-------------------------------------
   /**
    *
    * Coerces the specified value to a String
    **/
   public static String coerceToString (Object pValue,
                Logger pLogger)
     throws ELException
   {
     if (pValue == null) {
       return "";
     }
     else if (pValue instanceof String) {
       return (String) pValue;
     }
     else {
       try {
   return pValue.toString ();
       }
       catch (Exception exc) {
   if (pLogger.isLoggingError ()) {
     pLogger.logError (Constants.TOSTRING_EXCEPTION,
           exc,
           pValue.getClass ().getName ());
   }
   return "";
       }
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a value to the given primitive number class
    **/
   public static Number coerceToPrimitiveNumber (Object pValue,
             Class pClass,
             Logger pLogger)
     throws ELException
   {
     if (pValue == null ||
   "".equals (pValue)) {
       return coerceToPrimitiveNumber (ZERO, pClass);
     }
     else if (pValue instanceof Character) {
       char val = ((Character) pValue).charValue ();
       return coerceToPrimitiveNumber (new Short((short) val), pClass);
     }
     else if (pValue instanceof Boolean) {
       if (pLogger.isLoggingError ()) {
   pLogger.logError (Constants.BOOLEAN_TO_NUMBER,
         pValue,
         pClass.getName ());
       }
       return coerceToPrimitiveNumber (ZERO, pClass);
     }
     else if (pValue.getClass () == pClass) {
       return (Number) pValue;
     }
     else if (pValue instanceof Number) {
       return coerceToPrimitiveNumber ((Number) pValue, pClass);
     }
     else if (pValue instanceof String) {
       try {
   return coerceToPrimitiveNumber ((String) pValue, pClass);
       }
       catch (Exception exc) {
   if (pLogger.isLoggingError ()) {
     pLogger.logError
       (Constants.STRING_TO_NUMBER_EXCEPTION,
        (String) pValue,
        pClass.getName ());
   }
   return coerceToPrimitiveNumber (ZERO, pClass);
       }
     }
     else {
       if (pLogger.isLoggingError ()) {
   pLogger.logError
     (Constants.COERCE_TO_NUMBER,
      pValue.getClass ().getName (),
      pClass.getName ());
       }
       return coerceToPrimitiveNumber (0, pClass);
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a value to an Integer, returning null if the coercion
    * isn't possible.
    **/
   public static Integer coerceToInteger (Object pValue,
            Logger pLogger)
     throws ELException
   {
     if (pValue == null) {
       return null;
     }
     else if (pValue instanceof Character) {
       return PrimitiveObjects.getInteger 
   ((int) (((Character) pValue).charValue ()));
     }
     else if (pValue instanceof Boolean) {
       if (pLogger.isLoggingWarning ()) {
   pLogger.logWarning (Constants.BOOLEAN_TO_NUMBER,
           pValue,
           Integer.class.getName ());
       }
       return PrimitiveObjects.getInteger
   (((Boolean) pValue).booleanValue () ? 1 : 0);
     }
     else if (pValue instanceof Integer) {
       return (Integer) pValue;
     }
     else if (pValue instanceof Number) {
       return PrimitiveObjects.getInteger (((Number) pValue).intValue ());
     }
     else if (pValue instanceof String) {
       try {
   return Integer.valueOf ((String) pValue);
       }
       catch (Exception exc) {
   if (pLogger.isLoggingWarning ()) {
     pLogger.logWarning
       (Constants.STRING_TO_NUMBER_EXCEPTION,
        (String) pValue,
        Integer.class.getName ());
   }
   return null;
       }
     }
     else {
       if (pLogger.isLoggingWarning ()) {
   pLogger.logWarning
     (Constants.COERCE_TO_NUMBER,
      pValue.getClass ().getName (),
      Integer.class.getName ());
       }
       return null;
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a long to the given primitive number class
    **/
   static Number coerceToPrimitiveNumber (long pValue,
            Class pClass)
     throws ELException
   {
     if (pClass == Byte.class || pClass == Byte.TYPE) {
       return PrimitiveObjects.getByte ((byte) pValue);
     }
     else if (pClass == Short.class || pClass == Short.TYPE) {
       return PrimitiveObjects.getShort ((short) pValue);
     }
     else if (pClass == Integer.class || pClass == Integer.TYPE) {
       return PrimitiveObjects.getInteger ((int) pValue);
     }
     else if (pClass == Long.class || pClass == Long.TYPE) {
       return PrimitiveObjects.getLong (pValue);
     }
     else if (pClass == Float.class || pClass == Float.TYPE) {
       return PrimitiveObjects.getFloat ((float) pValue);
     }
     else if (pClass == Double.class || pClass == Double.TYPE) {
       return PrimitiveObjects.getDouble ((double) pValue);
     }
     else {
       return PrimitiveObjects.getInteger (0);
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a double to the given primitive number class
    **/
   static Number coerceToPrimitiveNumber (double pValue,
            Class pClass)
     throws ELException
   {
     if (pClass == Byte.class || pClass == Byte.TYPE) {
       return PrimitiveObjects.getByte ((byte) pValue);
     }
     else if (pClass == Short.class || pClass == Short.TYPE) {
       return PrimitiveObjects.getShort ((short) pValue);
     }
     else if (pClass == Integer.class || pClass == Integer.TYPE) {
       return PrimitiveObjects.getInteger ((int) pValue);
     }
     else if (pClass == Long.class || pClass == Long.TYPE) {
       return PrimitiveObjects.getLong ((long) pValue);
     }
     else if (pClass == Float.class || pClass == Float.TYPE) {
       return PrimitiveObjects.getFloat ((float) pValue);
     }
     else if (pClass == Double.class || pClass == Double.TYPE) {
       return PrimitiveObjects.getDouble (pValue);
     }
     else {
       return PrimitiveObjects.getInteger (0);
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a Number to the given primitive number class
    **/
   static Number coerceToPrimitiveNumber (Number pValue,
            Class pClass)
     throws ELException
   {
     if (pClass == Byte.class || pClass == Byte.TYPE) {
       return PrimitiveObjects.getByte (pValue.byteValue ());
     }
     else if (pClass == Short.class || pClass == Short.TYPE) {
       return PrimitiveObjects.getShort (pValue.shortValue ());
     }
     else if (pClass == Integer.class || pClass == Integer.TYPE) {
       return PrimitiveObjects.getInteger (pValue.intValue ());
     }
     else if (pClass == Long.class || pClass == Long.TYPE) {
       return PrimitiveObjects.getLong (pValue.longValue ());
     }
     else if (pClass == Float.class || pClass == Float.TYPE) {
       return PrimitiveObjects.getFloat (pValue.floatValue ());
     }
     else if (pClass == Double.class || pClass == Double.TYPE) {
       return PrimitiveObjects.getDouble (pValue.doubleValue ());
     }
     else if (pClass == BigInteger.class) {
         if (pValue instanceof BigDecimal)
             return ((BigDecimal) pValue).toBigInteger();
         else
             return BigInteger.valueOf(pValue.longValue());
     }
     else if (pClass == BigDecimal.class) {
         if (pValue instanceof BigInteger)
             return new BigDecimal((BigInteger) pValue);
         else
             return new BigDecimal(pValue.doubleValue());
     }
     else {
       return PrimitiveObjects.getInteger (0);
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a String to the given primitive number class
    **/
   static Number coerceToPrimitiveNumber (String pValue,
            Class pClass)
     throws ELException
   {
     if (pClass == Byte.class || pClass == Byte.TYPE) {
       return Byte.valueOf (pValue);
     }
     else if (pClass == Short.class || pClass == Short.TYPE) {
       return Short.valueOf (pValue);
     }
     else if (pClass == Integer.class || pClass == Integer.TYPE) {
       return Integer.valueOf (pValue);
     }
     else if (pClass == Long.class || pClass == Long.TYPE) {
       return Long.valueOf (pValue);
     }
     else if (pClass == Float.class || pClass == Float.TYPE) {
       return Float.valueOf (pValue);
     }
     else if (pClass == Double.class || pClass == Double.TYPE) {
       return Double.valueOf (pValue);
     }
     else if (pClass == BigInteger.class) {
         return new BigInteger(pValue);
     }
     else if (pClass == BigDecimal.class) {
         return new BigDecimal(pValue);
     }
     else {
       return PrimitiveObjects.getInteger (0);
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a value to a Character
    **/
   public static Character coerceToCharacter (Object pValue,
                Logger pLogger)
     throws ELException
   {
     if (pValue == null ||
   "".equals (pValue)) {
       return PrimitiveObjects.getCharacter ((char) 0);
     }
     else if (pValue instanceof Character) {
       return (Character) pValue;
     }
     else if (pValue instanceof Boolean) {
       if (pLogger.isLoggingError ()) {
   pLogger.logError (Constants.BOOLEAN_TO_CHARACTER, pValue);
       }
       return PrimitiveObjects.getCharacter ((char) 0);
     }
     else if (pValue instanceof Number) {
       return PrimitiveObjects.getCharacter 
   ((char) ((Number) pValue).shortValue ());
     }
     else if (pValue instanceof String) {
       String str = (String) pValue;
       return PrimitiveObjects.getCharacter (str.charAt (0));
     }
     else {
       if (pLogger.isLoggingError ()) {
   pLogger.logError
     (Constants.COERCE_TO_CHARACTER,
      pValue.getClass ().getName ());
       }
       return PrimitiveObjects.getCharacter ((char) 0);
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a value to a Boolean
    **/
   public static Boolean coerceToBoolean (Object pValue,
            Logger pLogger)
     throws ELException
   {
     if (pValue == null ||
   "".equals (pValue)) {
       return Boolean.FALSE;
     }
     else if (pValue instanceof Boolean) {
       return (Boolean) pValue;
     }
     else if (pValue instanceof String) {
       String str = (String) pValue;
       try {
   return Boolean.valueOf (str);
       }
       catch (Exception exc) {
   if (pLogger.isLoggingError ()) {
     pLogger.logError
       (Constants.STRING_TO_BOOLEAN,
        exc,
        (String) pValue);
   }
   return Boolean.FALSE;
       }
     }
     else {
       if (pLogger.isLoggingError ()) {
   pLogger.logError
     (Constants.COERCE_TO_BOOLEAN,
      pValue.getClass ().getName ());
       }
       return Boolean.TRUE;
     }
   }
 
   //-------------------------------------
   /**
    *
    * Coerces a value to the specified Class that is not covered by any
    * of the above cases
    **/
   public static Object coerceToObject (Object pValue,
                Class pClass,
                Logger pLogger)
     throws ELException
   {
     if (pValue == null) {
       return null;
     }
     else if (pClass.isAssignableFrom (pValue.getClass ())) {
       return pValue;
     }
     else if (pValue instanceof String) {
       String str = (String) pValue;
       PropertyEditor pe = PropertyEditorManager.findEditor (pClass);
       if (pe == null) {
   if ("".equals (str)) {
     return null;
   }
   else {
     if (pLogger.isLoggingError ()) {
       pLogger.logError
         (Constants.NO_PROPERTY_EDITOR,
          str,
          pClass.getName ());
     }
     return null;
   }
       }
       try {
   pe.setAsText (str);
   return pe.getValue ();
       }
       catch (IllegalArgumentException exc) {
   if ("".equals (str)) {
     return null;
   }
   else {
     if (pLogger.isLoggingError ()) {
       pLogger.logError
         (Constants.PROPERTY_EDITOR_ERROR,
          exc,
          pValue,
          pClass.getName ());
     }
     return null;
   }
       }
     }
     else {
       if (pLogger.isLoggingError ()) {
   pLogger.logError
     (Constants.COERCE_TO_OBJECT,
      pValue.getClass ().getName (),
      pClass.getName ());
       }
       return null;
     }
   }
 
   //-------------------------------------
   // Applying operators
   //-------------------------------------
   /**
    *
    * Performs all of the necessary type conversions, then calls on the
    * appropriate operator.
    **/
   public static Object applyArithmeticOperator 
     (Object pLeft,
      Object pRight,
      ArithmeticOperator pOperator,
      Logger pLogger)
     throws ELException
   {
     if (pLeft == null &&
   pRight == null) {
       if (pLogger.isLoggingWarning ()) {
   pLogger.logWarning
     (Constants.ARITH_OP_NULL,
      pOperator.getOperatorSymbol ());
       }
       return PrimitiveObjects.getInteger (0);
     }
 
     else if (isBigDecimal(pLeft) || isBigDecimal(pRight)) {
         BigDecimal left = (BigDecimal)
             coerceToPrimitiveNumber(pLeft, BigDecimal.class, pLogger);
         BigDecimal right = (BigDecimal)
             coerceToPrimitiveNumber(pRight, BigDecimal.class, pLogger);
         return pOperator.apply(left, right);
     }
 
     else if (isFloatingPointType(pLeft) ||
         isFloatingPointType(pRight) ||
         isFloatingPointString(pLeft) ||
         isFloatingPointString(pRight)) {
         if (isBigInteger(pLeft) || isBigInteger(pRight)) {
             BigDecimal left = (BigDecimal)
                 coerceToPrimitiveNumber(pLeft, BigDecimal.class, pLogger);
             BigDecimal right = (BigDecimal)
                 coerceToPrimitiveNumber(pRight, BigDecimal.class, pLogger);
             return pOperator.apply(left, right);
         } else {
             double left =
                 coerceToPrimitiveNumber(pLeft, Double.class, pLogger).
                 doubleValue();
             double right =
                 coerceToPrimitiveNumber(pRight, Double.class, pLogger).
                 doubleValue();
             return
                 PrimitiveObjects.getDouble(pOperator.apply(left, right));
         }
     }
 
     else if (isBigInteger(pLeft) || isBigInteger(pRight)) {
         BigInteger left = (BigInteger)
             coerceToPrimitiveNumber(pLeft, BigInteger.class, pLogger);
         BigInteger right = (BigInteger)
             coerceToPrimitiveNumber(pRight, BigInteger.class, pLogger);
         return pOperator.apply(left, right);
     }
 
     else {
       long left =
   coerceToPrimitiveNumber (pLeft, Long.class, pLogger).
   longValue ();
       long right =
   coerceToPrimitiveNumber (pRight, Long.class, pLogger).
   longValue ();
       return
   PrimitiveObjects.getLong (pOperator.apply (left, right));
     }
   }
 
   //-------------------------------------
   /**
    *
    * Performs all of the necessary type conversions, then calls on the
    * appropriate operator.
    **/
   public static Object applyRelationalOperator 
     (Object pLeft,
      Object pRight,
      RelationalOperator pOperator,
      Logger pLogger)
     throws ELException
   {
     if (isBigDecimal(pLeft) || isBigDecimal(pRight)) {
         BigDecimal left = (BigDecimal)
             coerceToPrimitiveNumber(pLeft, BigDecimal.class, pLogger);
         BigDecimal right = (BigDecimal)
             coerceToPrimitiveNumber(pRight, BigDecimal.class, pLogger);
         return PrimitiveObjects.getBoolean(pOperator.apply(left, right));
     }
 
     else if (isFloatingPointType (pLeft) ||
   isFloatingPointType (pRight)) {
       double left =
   coerceToPrimitiveNumber (pLeft, Double.class, pLogger).
   doubleValue ();
       double right =
   coerceToPrimitiveNumber (pRight, Double.class, pLogger).
   doubleValue ();
       return 
   PrimitiveObjects.getBoolean (pOperator.apply (left, right));
     }
 
     else if (isBigInteger(pLeft) || isBigInteger(pRight)) {
         BigInteger left = (BigInteger)
             coerceToPrimitiveNumber(pLeft, BigInteger.class, pLogger);
         BigInteger right = (BigInteger)
             coerceToPrimitiveNumber(pRight, BigInteger.class, pLogger);
         return PrimitiveObjects.getBoolean(pOperator.apply(left, right));
     }
 
     else if (isIntegerType (pLeft) ||
        isIntegerType (pRight)) {
       long left =
   coerceToPrimitiveNumber (pLeft, Long.class, pLogger).
   longValue ();
       long right =
   coerceToPrimitiveNumber (pRight, Long.class, pLogger).
   longValue ();
       return
   PrimitiveObjects.getBoolean (pOperator.apply (left, right));
     }
 
     else if (pLeft instanceof String ||
        pRight instanceof String) {
       String left = coerceToString (pLeft, pLogger);
       String right = coerceToString (pRight, pLogger);
       return
   PrimitiveObjects.getBoolean (pOperator.apply (left, right));
     }
 
     else if (pLeft instanceof Comparable) {
       try {
   int result = ((Comparable) pLeft).compareTo (pRight);
   return
     PrimitiveObjects.getBoolean 
     (pOperator.apply (result, -result));
       }
       catch (Exception exc) {
   if (pLogger.isLoggingError ()) {
     pLogger.logError
       (Constants.COMPARABLE_ERROR,
        exc,
        pLeft.getClass ().getName (),
        (pRight == null) ? "null" : pRight.getClass ().getName (),
        pOperator.getOperatorSymbol ());
   }
   return Boolean.FALSE;
       }
     }
 
     else if (pRight instanceof Comparable) {
       try {
   int result = ((Comparable) pRight).compareTo (pLeft);
   return
     PrimitiveObjects.getBoolean 
     (pOperator.apply (-result, result));
       }
       catch (Exception exc) {
   if (pLogger.isLoggingError ()) {
     pLogger.logError
       (Constants.COMPARABLE_ERROR,
        exc,
        pRight.getClass ().getName (),
        (pLeft == null) ? "null" : pLeft.getClass ().getName (),
        pOperator.getOperatorSymbol ());
   }
   return Boolean.FALSE;
       }
     }
 
     else {
       if (pLogger.isLoggingError ()) {
   pLogger.logError
     (Constants.ARITH_OP_BAD_TYPE,
      pOperator.getOperatorSymbol (),
      pLeft.getClass ().getName (),
      pRight.getClass ().getName ());
       }
       return Boolean.FALSE;
     }
   }
 
   //-------------------------------------
   /**
    *
    * Performs all of the necessary type conversions, then calls on the
   * appropriate operator.
   **/
  public static Object applyEqualityOperator 
    (Object pLeft,
     Object pRight,
     EqualityOperator pOperator,
     Logger pLogger)
    throws ELException
  {
    if (pLeft == pRight) {
      return PrimitiveObjects.getBoolean (pOperator.apply (true, pLogger));
    }

    else if (pLeft == null ||
       pRight == null) {
      return PrimitiveObjects.getBoolean (pOperator.apply (false, pLogger));
    }

    else if (isBigDecimal(pLeft) || isBigDecimal(pRight)) {
        BigDecimal left = (BigDecimal)
            coerceToPrimitiveNumber(pLeft, BigDecimal.class, pLogger);
        BigDecimal right = (BigDecimal)
            coerceToPrimitiveNumber(pRight, BigDecimal.class, pLogger);
        return PrimitiveObjects.getBoolean(pOperator.apply(left.equals(right), pLogger));
    }

    else if (isFloatingPointType (pLeft) ||
       isFloatingPointType (pRight)) {
      double left =
  coerceToPrimitiveNumber (pLeft, Double.class, pLogger).
  doubleValue ();
      double right =
  coerceToPrimitiveNumber (pRight, Double.class, pLogger).
  doubleValue ();
      return 
  PrimitiveObjects.getBoolean 
  (pOperator.apply (left == right, pLogger));
    }

    else if (isBigInteger(pLeft) || isBigInteger(pRight)) {
        BigInteger left = (BigInteger)
            coerceToPrimitiveNumber(pLeft, BigInteger.class, pLogger);
        BigInteger right = (BigInteger)
            coerceToPrimitiveNumber(pRight, BigInteger.class, pLogger);
        return PrimitiveObjects.getBoolean(pOperator.apply(left.equals(right), pLogger));
    }

    else if (isIntegerType (pLeft) ||
       isIntegerType (pRight)) {
      long left =
  coerceToPrimitiveNumber (pLeft, Long.class, pLogger).
  longValue ();
      long right =
  coerceToPrimitiveNumber (pRight, Long.class, pLogger).
  longValue ();
      return
  PrimitiveObjects.getBoolean 
  (pOperator.apply (left == right, pLogger));
    }

    else if (pLeft instanceof Boolean ||
       pRight instanceof Boolean) {
      boolean left = coerceToBoolean (pLeft, pLogger).booleanValue ();
      boolean right = coerceToBoolean (pRight, pLogger).booleanValue ();
      return
  PrimitiveObjects.getBoolean 
  (pOperator.apply (left == right, pLogger));
    }

    else if (pLeft instanceof String ||
       pRight instanceof String) {
      String left = coerceToString (pLeft, pLogger);
      String right = coerceToString (pRight, pLogger);
      return
  PrimitiveObjects.getBoolean 
  (pOperator.apply (left.equals (right), pLogger));
    }

    else {
      try {
      return
  PrimitiveObjects.getBoolean
  (pOperator.apply (pLeft.equals (pRight), pLogger));
      }
      catch (Exception exc) {
  if (pLogger.isLoggingError ()) {
    pLogger.logError
      (Constants.ERROR_IN_EQUALS,
       exc,
       pLeft.getClass ().getName (),
       pRight.getClass ().getName (),
       pOperator.getOperatorSymbol ());
  }
  return Boolean.FALSE;
      }
    }
  }

  //-------------------------------------
  /**
   *
   * Returns true if the given Object is of a floating point type
   **/
  public static boolean isFloatingPointType (Object pObject)
  {
    return 
      pObject != null &&
      isFloatingPointType (pObject.getClass ());
  }

  //-------------------------------------
  /**
   *
   * Returns true if the given class is of a floating point type
   **/
  public static boolean isFloatingPointType (Class pClass)
  {
    return
      pClass == Float.class ||
      pClass == Float.TYPE ||
      pClass == Double.class ||
      pClass == Double.TYPE;
  }

  //-------------------------------------
  /**
   *
   * Returns true if the given string might contain a floating point
   * number - i.e., it contains ".", "e", or "E"
   **/
  public static boolean isFloatingPointString (Object pObject)
  {
    if (pObject instanceof String) {
      String str = (String) pObject;
      int len = str.length ();
      for (int i = 0; i < len; i++) {
  char ch = str.charAt (i);
  if (ch == '.' ||
      ch == 'e' ||
      ch == 'E') {
    return true;
  }
      }
      return false;
    }
    else {
      return false;
    }
  }

  //-------------------------------------
  /**
   *
   * Returns true if the given Object is of an integer type
   **/
  public static boolean isIntegerType (Object pObject)
  {
    return 
      pObject != null &&
      isIntegerType (pObject.getClass ());
  }

  //-------------------------------------
  /**
   *
   * Returns true if the given class is of an integer type
   **/
  public static boolean isIntegerType (Class pClass)
  {
    return
      pClass == Byte.class ||
      pClass == Byte.TYPE ||
      pClass == Short.class ||
      pClass == Short.TYPE ||
      pClass == Character.class ||
      pClass == Character.TYPE ||
      pClass == Integer.class ||
      pClass == Integer.TYPE ||
      pClass == Long.class ||
      pClass == Long.TYPE;
  }

  //-------------------------------------

  /**
   * Returns true if the given object is BigInteger.
   * @param pObject - Object to evaluate
   * @return - true if the given object is BigInteger
   */
  public static boolean isBigInteger(Object pObject) {
      return
          pObject != null && pObject instanceof BigInteger;
  }

  /**
   * Returns true if the given object is BigDecimal.
   * @param pObject - Object to evaluate
   * @return - true if the given object is BigDecimal
   */
  public static boolean isBigDecimal(Object pObject) {
      return
          pObject != null && pObject instanceof BigDecimal;
  }
}