Java tutorial
/* * 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.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 { /* * modify:shig date:2013-7-9 description:null?null */ if (pLeft == null || pRight == null) { return null; } 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; } }