/*
* 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
* SUCH DAMAGE.
* ====================================================================
*
* 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.jbpm.jpdl.el.impl;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.math.BigInteger;
import java.math.BigDecimal;
import org.jbpm.jpdl.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$
**/
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,
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
(((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,
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 (pValue);
}
else if (pClass == Double.class || pClass == Double.TYPE) {
return PrimitiveObjects.getDouble (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,
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;
}
}