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com.sun.el.lang.ELSupport Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2021 Oracle and/or its affiliates and others.
* All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.el.lang;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.math.BigDecimal;
import java.math.BigInteger;
import jakarta.el.ELException;
import jakarta.el.PropertyNotFoundException;
import com.sun.el.util.MessageFactory;
/**
* A helper class that implements the Jakarta Expression Specification
*
* @author Jacob Hookom [[email protected] ]
* @author Kin-man Chung
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
*/
public class ELSupport {
private final static Long ZERO = Long.valueOf(0L);
public final static void throwUnhandled(Object base, Object property) throws ELException {
if (base == null) {
throw new PropertyNotFoundException(MessageFactory.get("error.resolver.unhandled.null", property));
} else {
throw new PropertyNotFoundException(MessageFactory.get("error.resolver.unhandled", base.getClass(), property));
}
}
/**
* @param obj0 First object to be compared
* @param obj1 Second object to be compared
* @return The result (an int with values -1, 0, or 1) of the comparison
* @throws ELException when something goes wrong
*/
public final static int compare(final Object obj0, final Object obj1) throws ELException {
if (obj0 == obj1 || equals(obj0, obj1)) {
return 0;
}
if (isBigDecimalOp(obj0, obj1)) {
BigDecimal bd0 = (BigDecimal) coerceToNumber(obj0, BigDecimal.class);
BigDecimal bd1 = (BigDecimal) coerceToNumber(obj1, BigDecimal.class);
return bd0.compareTo(bd1);
}
if (isDoubleOp(obj0, obj1)) {
Double d0 = (Double) coerceToNumber(obj0, Double.class);
Double d1 = (Double) coerceToNumber(obj1, Double.class);
return d0.compareTo(d1);
}
if (isBigIntegerOp(obj0, obj1)) {
BigInteger bi0 = (BigInteger) coerceToNumber(obj0, BigInteger.class);
BigInteger bi1 = (BigInteger) coerceToNumber(obj1, BigInteger.class);
return bi0.compareTo(bi1);
}
if (isLongOp(obj0, obj1)) {
Long l0 = (Long) coerceToNumber(obj0, Long.class);
Long l1 = (Long) coerceToNumber(obj1, Long.class);
return l0.compareTo(l1);
}
if (obj0 instanceof String || obj1 instanceof String) {
return coerceToString(obj0).compareTo(coerceToString(obj1));
}
if (obj0 instanceof Comparable) {
// Safe cast
@SuppressWarnings("unchecked")
Comparable cobj0 = (Comparable) obj0;
return (obj1 != null) ? cobj0.compareTo(obj1) : 1;
}
if (obj1 instanceof Comparable) {
// Safe cast
@SuppressWarnings("unchecked")
Comparable cobj1 = (Comparable) obj1;
return (obj0 != null) ? -(cobj1.compareTo(obj0)) : -1;
}
throw new ELException(MessageFactory.get("error.compare", obj0, obj1));
}
/**
* @param obj0 Fisrt object to be compared
* @param obj1 Second object to be compared
* @return true if the objects compared equal
* @throws ELException when something goes wrong
*/
public final static boolean equals(final Object obj0, final Object obj1) throws ELException {
if (obj0 == obj1) {
return true;
}
if (obj0 == null || obj1 == null) {
return false;
}
if (isBigDecimalOp(obj0, obj1)) {
BigDecimal bd0 = (BigDecimal) coerceToNumber(obj0, BigDecimal.class);
BigDecimal bd1 = (BigDecimal) coerceToNumber(obj1, BigDecimal.class);
return bd0.equals(bd1);
}
if (isDoubleOp(obj0, obj1)) {
Double d0 = (Double) coerceToNumber(obj0, Double.class);
Double d1 = (Double) coerceToNumber(obj1, Double.class);
return d0.equals(d1);
}
if (isBigIntegerOp(obj0, obj1)) {
BigInteger bi0 = (BigInteger) coerceToNumber(obj0, BigInteger.class);
BigInteger bi1 = (BigInteger) coerceToNumber(obj1, BigInteger.class);
return bi0.equals(bi1);
}
if (isLongOp(obj0, obj1)) {
Long l0 = (Long) coerceToNumber(obj0, Long.class);
Long l1 = (Long) coerceToNumber(obj1, Long.class);
return l0.equals(l1);
}
if (obj0 instanceof Boolean || obj1 instanceof Boolean) {
return coerceToBoolean(obj0).equals(coerceToBoolean(obj1));
}
if (obj0.getClass().isEnum()) {
return obj0.equals(coerceToEnum(obj1, obj0.getClass()));
}
if (obj1.getClass().isEnum()) {
return obj1.equals(coerceToEnum(obj0, obj1.getClass()));
}
if (obj0 instanceof String || obj1 instanceof String) {
return coerceToString(obj0).equals(coerceToString(obj1));
}
return obj0.equals(obj1);
}
/**
* @param obj Object to be coerced
* @return The result of coercion
*/
public final static Boolean coerceToBoolean(final Object obj) throws IllegalArgumentException {
if (obj == null || "".equals(obj)) {
return Boolean.FALSE;
}
if (obj instanceof Boolean) {
return (Boolean) obj;
}
if (obj instanceof String) {
return Boolean.valueOf((String) obj);
}
throw new IllegalArgumentException(MessageFactory.get("error.convert", obj, obj.getClass(), Boolean.class));
}
// Enum types are hard construct. We can declare this as
// > T coerceToEnum(Object, Class type)
// but this makes it harder to get the calls right.
@SuppressWarnings("unchecked")
public final static Enum coerceToEnum(final Object obj, Class type) {
if (obj == null || "".equals(obj)) {
return null;
}
if (obj.getClass().isEnum()) {
return (Enum) obj;
}
return Enum.valueOf(type, obj.toString());
}
public final static Character coerceToCharacter(final Object obj) throws IllegalArgumentException {
if (obj == null || "".equals(obj)) {
return Character.valueOf((char) 0);
}
if (obj instanceof String) {
return Character.valueOf(((String) obj).charAt(0));
}
if (ELArithmetic.isNumber(obj)) {
return Character.valueOf((char) ((Number) obj).shortValue());
}
Class objType = obj.getClass();
if (obj instanceof Character) {
return (Character) obj;
}
throw new IllegalArgumentException(MessageFactory.get("error.convert", obj, objType, Character.class));
}
public final static Number coerceToNumber(final Object obj) {
if (obj == null) {
return ZERO;
} else if (obj instanceof Number) {
return (Number) obj;
} else {
String str = coerceToString(obj);
if (isStringFloat(str)) {
return toFloat(str);
} else {
return toNumber(str);
}
}
}
protected final static Number coerceToNumber(final Number number, final Class type) throws IllegalArgumentException {
if (Long.TYPE == type || Long.class.equals(type)) {
return Long.valueOf(number.longValue());
}
if (Double.TYPE == type || Double.class.equals(type)) {
return Double.valueOf(number.doubleValue());
}
if (Integer.TYPE == type || Integer.class.equals(type)) {
return Integer.valueOf(number.intValue());
}
if (BigInteger.class.equals(type)) {
if (number instanceof BigDecimal) {
return ((BigDecimal) number).toBigInteger();
}
if (number instanceof BigInteger) {
return number;
}
return BigInteger.valueOf(number.longValue());
}
if (BigDecimal.class.equals(type)) {
if (number instanceof BigDecimal) {
return number;
}
if (number instanceof BigInteger) {
return new BigDecimal((BigInteger) number);
}
if (number instanceof Long) {
return new BigDecimal((Long) number);
}
return new BigDecimal(number.doubleValue());
}
if (Byte.TYPE == type || Byte.class.equals(type)) {
return Byte.valueOf(number.byteValue());
}
if (Short.TYPE == type || Short.class.equals(type)) {
return Short.valueOf(number.shortValue());
}
if (Float.TYPE == type || Float.class.equals(type)) {
return Float.valueOf(number.floatValue());
}
throw new IllegalArgumentException(MessageFactory.get("error.convert", number, number.getClass(), type));
}
public final static Number coerceToNumber(final Object obj, final Class type) throws IllegalArgumentException {
if (obj == null || "".equals(obj)) {
return coerceToNumber(ZERO, type);
}
if (obj instanceof String) {
return coerceToNumber((String) obj, type);
}
if (ELArithmetic.isNumber(obj)) {
if (obj.getClass().equals(type)) {
return (Number) obj;
}
return coerceToNumber((Number) obj, type);
}
if (obj instanceof Character) {
return coerceToNumber(Short.valueOf((short) ((Character) obj).charValue()), type);
}
throw new IllegalArgumentException(MessageFactory.get("error.convert", obj, obj.getClass(), type));
}
protected final static Number coerceToNumber(final String val, final Class type) throws IllegalArgumentException {
if (Long.TYPE == type || Long.class.equals(type)) {
return Long.valueOf(val);
}
if (Integer.TYPE == type || Integer.class.equals(type)) {
return Integer.valueOf(val);
}
if (Double.TYPE == type || Double.class.equals(type)) {
return Double.valueOf(val);
}
if (BigInteger.class.equals(type)) {
return new BigInteger(val);
}
if (BigDecimal.class.equals(type)) {
return new BigDecimal(val);
}
if (Byte.TYPE == type || Byte.class.equals(type)) {
return Byte.valueOf(val);
}
if (Short.TYPE == type || Short.class.equals(type)) {
return Short.valueOf(val);
}
if (Float.TYPE == type || Float.class.equals(type)) {
return Float.valueOf(val);
}
throw new IllegalArgumentException(MessageFactory.get("error.convert", val, String.class, type));
}
/**
* @param obj Object to be coerced
* @return The result of coercion
*/
public final static String coerceToString(final Object obj) {
if (obj == null) {
return "";
} else if (obj instanceof String) {
return (String) obj;
} else if (obj instanceof Enum) {
return ((Enum) obj).name();
} else {
return obj.toString();
}
}
public final static void checkType(final Object obj, final Class type) throws IllegalArgumentException {
if (String.class.equals(type)) {
coerceToString(obj);
}
if (ELArithmetic.isNumberType(type)) {
coerceToNumber(obj, type);
}
if (Character.class.equals(type) || Character.TYPE == type) {
coerceToCharacter(obj);
}
if (Boolean.class.equals(type) || Boolean.TYPE == type) {
coerceToBoolean(obj);
}
if (type.isEnum()) {
coerceToEnum(obj, type);
}
}
public final static T coerceToType(final Object obj, final Class type) throws IllegalArgumentException {
return coerceToType(obj, type, false);
}
public final static T coerceToType(final Object obj, final Class type, boolean isEL22Compatible) throws IllegalArgumentException {
if (type == null || Object.class.equals(type) || (obj != null && type.isAssignableFrom(obj.getClass()))) {
return (T) obj;
}
// New in 3.0
if (!isEL22Compatible && obj == null && !type.isPrimitive() && !String.class.equals(type)) {
return null;
}
if (String.class.equals(type)) {
return (T) coerceToString(obj);
}
if (ELArithmetic.isNumberType(type)) {
return (T) coerceToNumber(obj, type);
}
if (Character.class.equals(type) || Character.TYPE == type) {
return (T) coerceToCharacter(obj);
}
if (Boolean.class.equals(type) || Boolean.TYPE == type) {
return (T) coerceToBoolean(obj);
}
if (type.isEnum()) {
return (T) coerceToEnum(obj, type);
}
if (obj == null) {
return null;
}
if (obj instanceof String) {
if ("".equals(obj)) {
return null;
}
PropertyEditor editor = PropertyEditorManager.findEditor(type);
if (editor != null) {
editor.setAsText((String) obj);
return (T) editor.getValue();
}
}
throw new IllegalArgumentException(MessageFactory.get("error.convert", obj, obj.getClass(), type));
}
/**
* @param obj An array of objects
* @return true if the array contains a null, false otherwise
*/
public final static boolean containsNulls(final Object[] obj) {
for (int i = 0; i < obj.length; i++) {
if (obj[0] == null) {
return true;
}
}
return false;
}
public final static boolean isBigDecimalOp(final Object obj0, final Object obj1) {
return (obj0 instanceof BigDecimal || obj1 instanceof BigDecimal);
}
public final static boolean isBigIntegerOp(final Object obj0, final Object obj1) {
return (obj0 instanceof BigInteger || obj1 instanceof BigInteger);
}
public final static boolean isDoubleOp(final Object obj0, final Object obj1) {
return (obj0 instanceof Double || obj1 instanceof Double || obj0 instanceof Float || obj1 instanceof Float);
}
public final static boolean isDoubleStringOp(final Object obj0, final Object obj1) {
return (isDoubleOp(obj0, obj1) || (obj0 instanceof String && isStringFloat((String) obj0)) || (obj1 instanceof String && isStringFloat((String) obj1)));
}
public final static boolean isLongOp(final Object obj0, final Object obj1) {
return (obj0 instanceof Long || obj1 instanceof Long || obj0 instanceof Integer || obj1 instanceof Integer || obj0 instanceof Character
|| obj1 instanceof Character || obj0 instanceof Short || obj1 instanceof Short || obj0 instanceof Byte || obj1 instanceof Byte);
}
public final static boolean isStringFloat(final String str) {
int len = str.length();
if (len > 1) {
for (int i = 0; i < len; i++) {
switch (str.charAt(i)) {
case 'E':
return true;
case 'e':
return true;
case '.':
return true;
}
}
}
return false;
}
public final static Number toFloat(final String value) {
try {
if (Double.parseDouble(value) > Double.MAX_VALUE) {
return new BigDecimal(value);
} else {
return Double.valueOf(value);
}
} catch (NumberFormatException e0) {
return new BigDecimal(value);
}
}
public final static Number toNumber(final String value) {
try {
return Integer.valueOf(Integer.parseInt(value));
} catch (NumberFormatException e0) {
try {
return Long.valueOf(Long.parseLong(value));
} catch (NumberFormatException e1) {
return new BigInteger(value);
}
}
}
/**
*
*/
public ELSupport() {
super();
}
}
