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org.apache.el.lang.ELSupport Maven / Gradle / Ivy
/*
* Copyright 2006 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.el.lang;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.math.BigDecimal;
import java.math.BigInteger;
import javax.el.ELException;
import javax.el.PropertyNotFoundException;
import org.apache.el.util.MessageFactory;
/**
* A helper class that implements the EL Specification
*
* @author Jacob Hookom [[email protected] ]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
*/
public class ELSupport {
private final static ELSupport REF = new ELSupport();
private final static Long ZERO = new Long(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
* @param obj1
* @return
* @throws EvaluationException
*/
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) {
return (obj1 != null) ? ((Comparable) obj0).compareTo(obj1) : 1;
}
if (obj1 instanceof Comparable) {
return (obj0 != null) ? -((Comparable) obj1).compareTo(obj0) : -1;
}
throw new ELException(MessageFactory.get("error.compare", obj0, obj1));
}
/**
* @param obj0
* @param obj1
* @return
* @throws EvaluationException
*/
public final static boolean equals(final Object obj0, final Object obj1)
throws ELException {
if (obj0 == obj1) {
return true;
} else if (obj0 == null || obj1 == null) {
return false;
} else if (obj0 instanceof Boolean || obj1 instanceof Boolean) {
return coerceToBoolean(obj0).equals(coerceToBoolean(obj1));
}
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);
} else {
return obj0.equals(obj1);
}
}
/**
* @param obj
* @return
*/
public final static Boolean coerceToBoolean(final Object obj)
throws IllegalArgumentException {
if (obj == null || "".equals(obj)) {
return Boolean.FALSE;
}
if (obj instanceof Boolean || obj.getClass() == Boolean.TYPE) {
return (Boolean) obj;
}
if (obj instanceof String) {
return Boolean.valueOf((String) obj);
}
throw new IllegalArgumentException(MessageFactory.get("error.convert",
obj, obj.getClass(), Boolean.class));
}
public final static Character coerceToCharacter(final Object obj)
throws IllegalArgumentException {
if (obj == null || "".equals(obj)) {
return new Character((char) 0);
}
if (obj instanceof String) {
return new Character(((String) obj).charAt(0));
}
if (ELArithmetic.isNumber(obj)) {
return new Character((char) ((Number) obj).shortValue());
}
Class objType = obj.getClass();
if (obj instanceof Character || objType == Character.TYPE) {
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 new Long(number.longValue());
}
if (Double.TYPE == type || Double.class.equals(type)) {
return new Double(number.doubleValue());
}
if (Integer.TYPE == type || Integer.class.equals(type)) {
return new Integer(number.intValue());
}
if (BigInteger.class.equals(type)) {
if (number instanceof BigDecimal) {
return ((BigDecimal) number).toBigInteger();
}
return BigInteger.valueOf(number.longValue());
}
if (BigDecimal.class.equals(type)) {
if (number instanceof BigInteger) {
return new BigDecimal((BigInteger) number);
}
return new BigDecimal(number.doubleValue());
}
if (Byte.TYPE == type || Byte.class.equals(type)) {
return new Byte(number.byteValue());
}
if (Short.TYPE == type || Short.class.equals(type)) {
return new Short(number.shortValue());
}
if (Float.TYPE == type || Float.class.equals(type)) {
return new Float(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)) {
return coerceToNumber((Number) obj, type);
}
Class objType = obj.getClass();
if (Character.class.equals(objType) || Character.TYPE == objType) {
return coerceToNumber(new Short((short) ((Character) obj)
.charValue()), type);
}
throw new IllegalArgumentException(MessageFactory.get("error.convert",
obj, objType, 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
* @return
*/
public final static String coerceToString(final Object obj) {
if (obj == null) {
return "";
} else if (obj instanceof String) {
return (String) obj;
} else {
return obj.toString();
}
}
public final static Object coerceToType(final Object obj, final Class type)
throws IllegalArgumentException {
if (type == null || Object.class.equals(type)) {
return obj;
}
if (String.class.equals(type)) {
return coerceToString(obj);
}
if (ELArithmetic.isNumberType(type)) {
return coerceToNumber(obj, type);
}
if (Character.class.equals(type) || Character.TYPE == type) {
return coerceToCharacter(obj);
}
if (Boolean.class.equals(type) || Boolean.TYPE == type) {
return coerceToBoolean(obj);
}
if (obj != null && type.isAssignableFrom(obj.getClass())) {
return obj;
}
// new to spec
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 editor.getValue();
}
}
throw new IllegalArgumentException(MessageFactory.get("error.convert",
obj, obj.getClass(), type));
}
/**
* @param obj
* @return
*/
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
|| (obj0 != null && (Double.TYPE == obj0.getClass() || Float.TYPE == obj0
.getClass())) || (obj1 != null && (Double.TYPE == obj1
.getClass() || Float.TYPE == obj1.getClass())));
}
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
|| (obj0 != null && (Long.TYPE == obj0.getClass()
|| Integer.TYPE == obj0.getClass()
|| Character.TYPE == obj0.getClass()
|| Short.TYPE == obj0.getClass() || Byte.TYPE == obj0
.getClass())) || (obj0 != null && (Long.TYPE == obj0
.getClass()
|| Integer.TYPE == obj0.getClass()
|| Character.TYPE == obj0.getClass()
|| Short.TYPE == obj0.getClass() || Byte.TYPE == obj0
.getClass())));
}
public final static boolean isStringFloat(final String str) {
int len = str.length();
if (len > 1) {
char c = 0;
for (int i = 0; i < len; i++) {
switch (c = 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 new Double(value);
}
} catch (NumberFormatException e0) {
return new BigDecimal(value);
}
}
public final static Number toNumber(final String value) {
try {
return new Integer(Integer.parseInt(value));
} catch (NumberFormatException e0) {
try {
return new Long(Long.parseLong(value));
} catch (NumberFormatException e1) {
return new BigInteger(value);
}
}
}
/**
*
*/
public ELSupport() {
super();
}
}
