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/*
* 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.math.BigDecimal;
import java.math.BigInteger;
import org.apache.el.util.MessageFactory;
/**
* A helper class of Arithmetic defined by the EL Specification
* @author Jacob Hookom [[email protected]]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: dpatil $
*/
public abstract class ELArithmetic {
public final static class BigDecimalDelegate extends ELArithmetic {
protected Number add(Number num0, Number num1) {
return ((BigDecimal) num0).add((BigDecimal) num1);
}
protected Number coerce(Number num) {
if (num instanceof BigDecimal)
return num;
if (num instanceof BigInteger)
return new BigDecimal((BigInteger) num);
return new BigDecimal(num.doubleValue());
}
protected Number coerce(String str) {
return new BigDecimal(str);
}
protected Number divide(Number num0, Number num1) {
return ((BigDecimal) num0).divide((BigDecimal) num1,
BigDecimal.ROUND_HALF_UP);
}
protected Number subtract(Number num0, Number num1) {
return ((BigDecimal) num0).subtract((BigDecimal) num1);
}
protected Number mod(Number num0, Number num1) {
return new Double(num0.doubleValue() % num1.doubleValue());
}
protected Number multiply(Number num0, Number num1) {
return ((BigDecimal) num0).multiply((BigDecimal) num1);
}
public boolean matches(Object obj0, Object obj1) {
return (obj0 instanceof BigDecimal || obj1 instanceof BigDecimal);
}
}
public final static class BigIntegerDelegate extends ELArithmetic {
protected Number add(Number num0, Number num1) {
return ((BigInteger) num0).add((BigInteger) num1);
}
protected Number coerce(Number num) {
if (num instanceof BigInteger)
return num;
return new BigInteger(num.toString());
}
protected Number coerce(String str) {
return new BigInteger(str);
}
protected Number divide(Number num0, Number num1) {
return (new BigDecimal((BigInteger) num0)).divide(new BigDecimal((BigInteger) num1), BigDecimal.ROUND_HALF_UP);
}
protected Number multiply(Number num0, Number num1) {
return ((BigInteger) num0).multiply((BigInteger) num1);
}
protected Number mod(Number num0, Number num1) {
return ((BigInteger) num0).mod((BigInteger) num1);
}
protected Number subtract(Number num0, Number num1) {
return ((BigInteger) num0).subtract((BigInteger) num1);
}
public boolean matches(Object obj0, Object obj1) {
return (obj0 instanceof BigInteger || obj1 instanceof BigInteger);
}
}
public final static class DoubleDelegate extends ELArithmetic {
protected Number add(Number num0, Number num1) {
// could only be one of these
if (num0 instanceof BigDecimal) {
return ((BigDecimal) num0).add(new BigDecimal(num1.doubleValue()));
} else if (num1 instanceof BigDecimal) {
return ((new BigDecimal(num0.doubleValue()).add((BigDecimal) num1)));
}
return new Double(num0.doubleValue() + num1.doubleValue());
}
protected Number coerce(Number num) {
if (num instanceof Double)
return num;
if (num instanceof BigInteger)
return new BigDecimal((BigInteger) num);
return new Double(num.doubleValue());
}
protected Number coerce(String str) {
return new Double(str);
}
protected Number divide(Number num0, Number num1) {
return new Double(num0.doubleValue() / num1.doubleValue());
}
protected Number mod(Number num0, Number num1) {
return new Double(num0.doubleValue() % num1.doubleValue());
}
protected Number subtract(Number num0, Number num1) {
// could only be one of these
if (num0 instanceof BigDecimal) {
return ((BigDecimal) num0).subtract(new BigDecimal(num1.doubleValue()));
} else if (num1 instanceof BigDecimal) {
return ((new BigDecimal(num0.doubleValue()).subtract((BigDecimal) num1)));
}
return new Double(num0.doubleValue() - num1.doubleValue());
}
protected Number multiply(Number num0, Number num1) {
// could only be one of these
if (num0 instanceof BigDecimal) {
return ((BigDecimal) num0).multiply(new BigDecimal(num1.doubleValue()));
} else if (num1 instanceof BigDecimal) {
return ((new BigDecimal(num0.doubleValue()).multiply((BigDecimal) num1)));
}
return new Double(num0.doubleValue() * num1.doubleValue());
}
public boolean matches(Object obj0, 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()))
|| (obj0 instanceof String && ELSupport
.isStringFloat((String) obj0)) || (obj1 instanceof String && ELSupport
.isStringFloat((String) obj1)));
}
}
public final static class LongDelegate extends ELArithmetic {
protected Number add(Number num0, Number num1) {
return new Long(num0.longValue() + num1.longValue());
}
protected Number coerce(Number num) {
if (num instanceof Long)
return num;
return new Long(num.longValue());
}
protected Number coerce(String str) {
return new Long(str);
}
protected Number divide(Number num0, Number num1) {
return new Long(num0.longValue() / num1.longValue());
}
protected Number mod(Number num0, Number num1) {
return new Long(num0.longValue() % num1.longValue());
}
protected Number subtract(Number num0, Number num1) {
return new Long(num0.longValue() - num1.longValue());
}
protected Number multiply(Number num0, Number num1) {
return new Long(num0.longValue() * num1.longValue());
}
public boolean matches(Object obj0, Object obj1) {
return (obj0 instanceof Long || obj1 instanceof Long);
}
}
public final static BigDecimalDelegate BIGDECIMAL = new BigDecimalDelegate();
public final static BigIntegerDelegate BIGINTEGER = new BigIntegerDelegate();
public final static DoubleDelegate DOUBLE = new DoubleDelegate();
public final static LongDelegate LONG = new LongDelegate();
private final static Long ZERO = new Long(0);
public final static Number add(final Object obj0, final Object obj1) {
if (obj0 == null && obj1 == null) {
return new Long(0);
}
final ELArithmetic delegate;
if (BIGDECIMAL.matches(obj0, obj1))
delegate = BIGDECIMAL;
else if (DOUBLE.matches(obj0, obj1))
delegate = DOUBLE;
else if (BIGINTEGER.matches(obj0, obj1))
delegate = BIGINTEGER;
else
delegate = LONG;
Number num0 = delegate.coerce(obj0);
Number num1 = delegate.coerce(obj1);
return delegate.add(num0, num1);
}
public final static Number mod(final Object obj0, final Object obj1) {
if (obj0 == null && obj1 == null) {
return new Long(0);
}
final ELArithmetic delegate;
if (BIGDECIMAL.matches(obj0, obj1))
delegate = BIGDECIMAL;
else if (DOUBLE.matches(obj0, obj1))
delegate = DOUBLE;
else if (BIGINTEGER.matches(obj0, obj1))
delegate = BIGINTEGER;
else
delegate = LONG;
Number num0 = delegate.coerce(obj0);
Number num1 = delegate.coerce(obj1);
return delegate.mod(num0, num1);
}
public final static Number subtract(final Object obj0, final Object obj1) {
if (obj0 == null && obj1 == null) {
return new Long(0);
}
final ELArithmetic delegate;
if (BIGDECIMAL.matches(obj0, obj1))
delegate = BIGDECIMAL;
else if (DOUBLE.matches(obj0, obj1))
delegate = DOUBLE;
else if (BIGINTEGER.matches(obj0, obj1))
delegate = BIGINTEGER;
else
delegate = LONG;
Number num0 = delegate.coerce(obj0);
Number num1 = delegate.coerce(obj1);
return delegate.subtract(num0, num1);
}
public final static Number divide(final Object obj0, final Object obj1) {
if (obj0 == null && obj1 == null) {
return ZERO;
}
final ELArithmetic delegate;
if (BIGDECIMAL.matches(obj0, obj1))
delegate = BIGDECIMAL;
else if (BIGINTEGER.matches(obj0, obj1))
delegate = BIGDECIMAL;
else
delegate = DOUBLE;
Number num0 = delegate.coerce(obj0);
Number num1 = delegate.coerce(obj1);
return delegate.divide(num0, num1);
}
public final static Number multiply(final Object obj0, final Object obj1) {
if (obj0 == null && obj1 == null) {
return new Long(0);
}
final ELArithmetic delegate;
if (BIGDECIMAL.matches(obj0, obj1))
delegate = BIGDECIMAL;
else if (DOUBLE.matches(obj0, obj1))
delegate = DOUBLE;
else if (BIGINTEGER.matches(obj0, obj1))
delegate = BIGINTEGER;
else
delegate = LONG;
Number num0 = delegate.coerce(obj0);
Number num1 = delegate.coerce(obj1);
return delegate.multiply(num0, num1);
}
public final static boolean isNumber(final Object obj) {
return (obj != null && isNumberType(obj.getClass()));
}
public final static boolean isNumberType(final Class type) {
return type == (java.lang.Long.class) || type == Long.TYPE || type == (java.lang.Double.class) || type == Double.TYPE || type == (java.lang.Byte.class) || type == Byte.TYPE || type == (java.lang.Short.class) || type == Short.TYPE || type == (java.lang.Integer.class) || type == Integer.TYPE || type == (java.lang.Float.class) || type == Float.TYPE || type == (java.math.BigInteger.class) || type == (java.math.BigDecimal.class);
}
/**
*
*/
protected ELArithmetic() {
super();
}
protected abstract Number add(final Number num0, final Number num1);
protected abstract Number multiply(final Number num0, final Number num1);
protected abstract Number subtract(final Number num0, final Number num1);
protected abstract Number mod(final Number num0, final Number num1);
protected abstract Number coerce(final Number num);
protected final Number coerce(final Object obj) {
if (isNumber(obj)) {
return coerce((Number) obj);
}
if (obj instanceof String) {
return coerce((String) obj);
}
if (obj == null || "".equals(obj)) {
return coerce(ZERO);
}
Class objType = obj.getClass();
if (Character.class.equals(objType) || Character.TYPE == objType) {
return coerce(new Short((short) ((Character) obj).charValue()));
}
throw new IllegalArgumentException(MessageFactory.get("el.convert", obj,
objType));
}
protected abstract Number coerce(final String str);
protected abstract Number divide(final Number num0, final Number num1);
protected abstract boolean matches(final Object obj0, final Object obj1);
}
